* decl.c (grokdeclarator): Remove const and volatile from type after

[official-gcc.git] / gcc / cpplib.c

/* CPP Library.
   Copyright (C) 1986, 87, 89, 92-7, 1998 Free Software Foundation, Inc.
   Contributed by Per Bothner, 1994-95.
   Based on CCCP program by Paul Rubin, June 1986
   Adapted to ANSI C, Richard Stallman, Jan 1987

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "config.h"

#ifndef STDC_VALUE
#define STDC_VALUE 1
#endif

#include <ctype.h>
#include <stdio.h>
#include <signal.h>

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
#  include <time.h>
#endif
#endif

#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif

#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif

#if HAVE_LIMITS_H
# include <limits.h>
#endif

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_STRING_H
# include <string.h>
# else
# ifdef HAVE_STRINGS_H
#  include <strings.h>
#endif
#endif

/* This defines "errno" properly for VMS, and gives us EACCES.  */
#include <errno.h>

#include "cpplib.h"
#include "cpphash.h"
#include "gansidecl.h"

#ifdef NEED_DECLARATION_INDEX
extern char *index ();
#endif

#ifdef NEED_DECLARATION_RINDEX
extern char *rindex ();
#endif

#ifdef NEED_DECLARATION_GETENV
extern char *getenv ();
#endif

extern char *update_path ();

#ifndef O_RDONLY
#define O_RDONLY 0
#endif

#undef MIN
#undef MAX
#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))

/* Find the largest host integer type and set its size and type.
   Watch out: on some crazy hosts `long' is shorter than `int'.  */

#ifndef HOST_WIDE_INT
# if HAVE_INTTYPES_H
#  include <inttypes.h>
#  define HOST_WIDE_INT intmax_t
# else
#  if (HOST_BITS_PER_LONG <= HOST_BITS_PER_INT \
       && HOST_BITS_PER_LONGLONG <= HOST_BITS_PER_INT)
#   define HOST_WIDE_INT int
#  else
#  if (HOST_BITS_PER_LONGLONG <= HOST_BITS_PER_LONG \
       || ! (defined LONG_LONG_MAX || defined LLONG_MAX))
#   define HOST_WIDE_INT long
#  else
#   define HOST_WIDE_INT long long
#  endif
#  endif
# endif
#endif

#ifndef S_ISREG
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif

#ifndef S_ISDIR
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

/* By default, colon separates directories in a path.  */
#ifndef PATH_SEPARATOR
#define PATH_SEPARATOR ':'
#endif

#ifndef STANDARD_INCLUDE_DIR
#define STANDARD_INCLUDE_DIR "/usr/include"
#endif
#ifndef INCLUDE_LEN_FUDGE
#define INCLUDE_LEN_FUDGE 0
#endif

/* Symbols to predefine.  */

#ifdef CPP_PREDEFINES
static char *predefs = CPP_PREDEFINES;
#else
static char *predefs = "";
#endif
\f
/* We let tm.h override the types used here, to handle trivial differences
   such as the choice of unsigned int or long unsigned int for size_t.
   When machines start needing nontrivial differences in the size type,
   it would be best to do something here to figure out automatically
   from other information what type to use.  */

/* The string value for __SIZE_TYPE__.  */

#ifndef SIZE_TYPE
#define SIZE_TYPE "long unsigned int"
#endif

/* The string value for __PTRDIFF_TYPE__.  */

#ifndef PTRDIFF_TYPE
#define PTRDIFF_TYPE "long int"
#endif

/* The string value for __WCHAR_TYPE__.  */

#ifndef WCHAR_TYPE
#define WCHAR_TYPE "int"
#endif
#define CPP_WCHAR_TYPE(PFILE) \
        (CPP_OPTIONS (PFILE)->cplusplus ? "__wchar_t" : WCHAR_TYPE)

/* The string value for __USER_LABEL_PREFIX__ */

#ifndef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX ""
#endif

/* The string value for __REGISTER_PREFIX__ */

#ifndef REGISTER_PREFIX
#define REGISTER_PREFIX ""
#endif
\f
/* In the definition of a #assert name, this structure forms
   a list of the individual values asserted.
   Each value is itself a list of "tokens".
   These are strings that are compared by name.  */

struct tokenlist_list {
  struct tokenlist_list *next;
  struct arglist *tokens;
};

struct assertion_hashnode {
  struct assertion_hashnode *next;      /* double links for easy deletion */
  struct assertion_hashnode *prev;
  /* also, a back pointer to this node's hash
     chain is kept, in case the node is the head
     of the chain and gets deleted.  */
  struct assertion_hashnode **bucket_hdr;
  int length;                   /* length of token, for quick comparison */
  U_CHAR *name;                 /* the actual name */
  /* List of token-sequences.  */
  struct tokenlist_list *value;
};
\f
#define SKIP_WHITE_SPACE(p) do { while (is_hor_space[*p]) p++; } while (0)
#define SKIP_ALL_WHITE_SPACE(p) do { while (is_space[*p]) p++; } while (0)

#define PEEKN(N) (CPP_BUFFER (pfile)->rlimit - CPP_BUFFER (pfile)->cur >= (N) ? CPP_BUFFER (pfile)->cur[N] : EOF)
#define FORWARD(N) CPP_FORWARD (CPP_BUFFER (pfile), (N))
#define GETC() CPP_BUF_GET (CPP_BUFFER (pfile))
#define PEEKC() CPP_BUF_PEEK (CPP_BUFFER (pfile))
/* CPP_IS_MACRO_BUFFER is true if the buffer contains macro expansion.
   (Note that it is false while we're expanding marco *arguments*.) */
#define CPP_IS_MACRO_BUFFER(PBUF) ((PBUF)->cleanup == macro_cleanup)

/* Move all backslash-newline pairs out of embarrassing places.
   Exchange all such pairs following BP
   with any potentially-embarrassing characters that follow them.
   Potentially-embarrassing characters are / and *
   (because a backslash-newline inside a comment delimiter
   would cause it not to be recognized).  */

#define NEWLINE_FIX \
  do {while (PEEKC() == '\\' && PEEKN(1) == '\n') FORWARD(2); } while(0)

/* Same, but assume we've already read the potential '\\' into C.  */
#define NEWLINE_FIX1(C) do { \
    while ((C) == '\\' && PEEKC() == '\n') { FORWARD(1); (C) = GETC(); }\
  } while(0)

struct cpp_pending {
  struct cpp_pending *next;
  char *cmd;
  char *arg;
};

/* Forward declarations.  */

char *xmalloc ();
void cpp_fatal ();
void cpp_file_line_for_message PARAMS ((cpp_reader *, char *, int, int));
void cpp_hash_cleanup PARAMS ((cpp_reader *));
void cpp_message ();
void cpp_print_containing_files PARAMS ((cpp_reader *));

static void add_import ();
static void append_include_chain ();
static void make_assertion ();
static void path_include ();
static void initialize_builtins ();
static void initialize_char_syntax ();
extern void delete_macro ();
#if 0
static void trigraph_pcp ();
#endif
static int finclude ();
static void validate_else ();
static int comp_def_part ();
#ifdef abort
extern void fancy_abort ();
#endif
static int lookup_import ();
static int redundant_include_p ();
static int is_system_include ();
static struct file_name_map *read_name_map ();
static char *read_filename_string ();
static int open_include_file ();
static int check_macro_name ();
static int compare_defs ();
static int compare_token_lists ();
static HOST_WIDE_INT eval_if_expression ();
static int change_newlines ();
extern int hashf ();
static struct arglist *read_token_list ();
static void free_token_list ();
static int safe_read ();
static void push_macro_expansion PARAMS ((cpp_reader *,
                                          U_CHAR *, int, HASHNODE *));
static struct cpp_pending *nreverse_pending PARAMS ((struct cpp_pending *));
extern char *xrealloc ();
static char *xcalloc ();
static char *savestring ();

static void conditional_skip ();
static void skip_if_group ();

/* Last arg to output_line_command.  */
enum file_change_code {same_file, enter_file, leave_file};

/* External declarations.  */

extern HOST_WIDE_INT cpp_parse_expr PARAMS ((cpp_reader *));

extern FILE *fdopen ();
extern char *version_string;
extern struct tm *localtime ();

/* These functions are declared to return int instead of void since they
   are going to be placed in a table and some old compilers have trouble with
   pointers to functions returning void.  */

static int do_define ();
static int do_line ();
static int do_include ();
static int do_undef ();
static int do_error ();
static int do_pragma ();
static int do_ident ();
static int do_if ();
static int do_xifdef ();
static int do_else ();
static int do_elif ();
static int do_endif ();
static int do_sccs ();
static int do_once ();
static int do_assert ();
static int do_unassert ();
static int do_warning ();
\f
struct file_name_list
  {
    struct file_name_list *next;
    char *fname;
    /* If the following is nonzero, it is a macro name.
       Don't include the file again if that macro is defined.  */
    U_CHAR *control_macro;
    /* If the following is nonzero, it is a C-language system include
       directory.  */
    int c_system_include_path;
    /* Mapping of file names for this directory.  */
    struct file_name_map *name_map;
    /* Non-zero if name_map is valid.  */
    int got_name_map;
  };

/* If a buffer's dir field is SELF_DIR_DUMMY, it means the file was found
   via the same directory as the file that #included it.  */
#define SELF_DIR_DUMMY ((struct file_name_list *) (~0))

/* #include "file" looks in source file dir, then stack.  */
/* #include <file> just looks in the stack.  */
/* -I directories are added to the end, then the defaults are added.  */
/* The */
static struct default_include {
  char *fname;                  /* The name of the directory.  */
  char *component;              /* The component containing the directory */
  int cplusplus;                /* Only look here if we're compiling C++.  */
  int cxx_aware;                /* Includes in this directory don't need to
                                   be wrapped in extern "C" when compiling
                                   C++.  */
} include_defaults_array[]
#ifdef INCLUDE_DEFAULTS
  = INCLUDE_DEFAULTS;
#else
  = {
    /* Pick up GNU C++ specific include files.  */
    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },
    { OLD_GPLUSPLUS_INCLUDE_DIR, 0, 1, 1 },
#ifdef CROSS_COMPILE
    /* This is the dir for fixincludes.  Put it just before
       the files that we fix.  */
    { GCC_INCLUDE_DIR, "GCC", 0, 0 },
    /* For cross-compilation, this dir name is generated
       automatically in Makefile.in.  */
    { CROSS_INCLUDE_DIR, "GCC",0, 0 },
#ifdef TOOL_INCLUDE_DIR
    /* This is another place that the target system's headers might be.  */
    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1 },
#endif
#else /* not CROSS_COMPILE */
#ifdef LOCAL_INCLUDE_DIR
    /* This should be /usr/local/include and should come before
       the fixincludes-fixed header files.  */
    { LOCAL_INCLUDE_DIR, 0, 0, 1 },
#endif
#ifdef TOOL_INCLUDE_DIR
    /* This is here ahead of GCC_INCLUDE_DIR because assert.h goes here.
       Likewise, behind LOCAL_INCLUDE_DIR, where glibc puts its assert.h.  */
    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1 },
#endif
    /* This is the dir for fixincludes.  Put it just before
       the files that we fix.  */
    { GCC_INCLUDE_DIR, "GCC", 0, 0 },
    /* Some systems have an extra dir of include files.  */
#ifdef SYSTEM_INCLUDE_DIR
    { SYSTEM_INCLUDE_DIR, 0, 0, 0 },
#endif
#ifndef STANDARD_INCLUDE_COMPONENT
#define STANDARD_INCLUDE_COMPONENT 0
#endif
    { STANDARD_INCLUDE_DIR, STANDARD_INCLUDE_COMPONENT, 0, 0 },
#endif /* not CROSS_COMPILE */
    { 0, 0, 0, 0 }
    };
#endif /* no INCLUDE_DEFAULTS */

/* `struct directive' defines one #-directive, including how to handle it.  */

struct directive {
  int length;                   /* Length of name */
  int (*func)();                /* Function to handle directive */
  char *name;                   /* Name of directive */
  enum node_type type;          /* Code which describes which directive.  */
  char command_reads_line;      /* One if rest of line is read by func.  */
};

#define IS_INCLUDE_DIRECTIVE_TYPE(t) (T_INCLUDE <= (t) && (t) <= T_IMPORT)

/* Here is the actual list of #-directives, most-often-used first.
   The initialize_builtins function assumes #define is the very first.  */

static struct directive directive_table[] = {
  {  6, do_define, "define", T_DEFINE},
  {  5, do_xifdef, "ifdef", T_IFDEF, 1},
  {  6, do_xifdef, "ifndef", T_IFNDEF, 1},
  {  7, do_include, "include", T_INCLUDE, 1},
  { 12, do_include, "include_next", T_INCLUDE_NEXT, 1},
  {  6, do_include, "import", T_IMPORT, 1},
  {  5, do_endif, "endif", T_ENDIF, 1},
  {  4, do_else, "else", T_ELSE, 1},
  {  2, do_if, "if", T_IF, 1},
  {  4, do_elif, "elif", T_ELIF, 1},
  {  5, do_undef, "undef", T_UNDEF},
  {  5, do_error, "error", T_ERROR},
  {  7, do_warning, "warning", T_WARNING},
  {  6, do_pragma, "pragma", T_PRAGMA},
  {  4, do_line, "line", T_LINE, 1},
  {  5, do_ident, "ident", T_IDENT, 1},
#ifdef SCCS_DIRECTIVE
  {  4, do_sccs, "sccs", T_SCCS},
#endif
  {  6, do_assert, "assert", T_ASSERT, 1},
  {  8, do_unassert, "unassert", T_UNASSERT, 1},
  {  -1, 0, "", T_UNUSED},
};
\f
/* table to tell if char can be part of a C identifier.  */
U_CHAR is_idchar[256];
/* table to tell if char can be first char of a c identifier.  */
U_CHAR is_idstart[256];
/* table to tell if c is horizontal space.  */
U_CHAR is_hor_space[256];
/* table to tell if c is horizontal or vertical space.  */
static U_CHAR is_space[256];

/* Initialize syntactic classifications of characters.  */

static void
initialize_char_syntax (opts)
     struct cpp_options *opts;
{
  register int i;

  /*
   * Set up is_idchar and is_idstart tables.  These should be
   * faster than saying (is_alpha (c) || c == '_'), etc.
   * Set up these things before calling any routines tthat
   * refer to them.
   */
  for (i = 'a'; i <= 'z'; i++) {
    is_idchar[i - 'a' + 'A'] = 1;
    is_idchar[i] = 1;
    is_idstart[i - 'a' + 'A'] = 1;
    is_idstart[i] = 1;
  }
  for (i = '0'; i <= '9'; i++)
    is_idchar[i] = 1;
  is_idchar['_'] = 1;
  is_idstart['_'] = 1;
  is_idchar['$'] = opts->dollars_in_ident;
  is_idstart['$'] = opts->dollars_in_ident;

  /* horizontal space table */
  is_hor_space[' '] = 1;
  is_hor_space['\t'] = 1;
  is_hor_space['\v'] = 1;
  is_hor_space['\f'] = 1;
  is_hor_space['\r'] = 1;

  is_space[' '] = 1;
  is_space['\t'] = 1;
  is_space['\v'] = 1;
  is_space['\f'] = 1;
  is_space['\n'] = 1;
  is_space['\r'] = 1;
}


/* Place into PFILE a quoted string representing the string SRC.
   Caller must reserve enough space in pfile->token_buffer.  */

static void
quote_string (pfile, src)
     cpp_reader *pfile;
     char *src;
{
  U_CHAR c;

  CPP_PUTC_Q (pfile, '\"');
  for (;;)
    switch ((c = *src++))
      {
      default:
        if (isprint (c))
          CPP_PUTC_Q (pfile, c);
        else
          {
            sprintf ((char *)CPP_PWRITTEN (pfile), "\\%03o", c);
            CPP_ADJUST_WRITTEN (pfile, 4);
          }
        break;

      case '\"':
      case '\\':
        CPP_PUTC_Q (pfile, '\\');
        CPP_PUTC_Q (pfile, c);
        break;
      
      case '\0':
        CPP_PUTC_Q (pfile, '\"');
        CPP_NUL_TERMINATE_Q (pfile);
        return;
      }
}

/* Re-allocates PFILE->token_buffer so it will hold at least N more chars.  */

void
cpp_grow_buffer (pfile, n)
     cpp_reader *pfile;
     long n;
{
  long old_written = CPP_WRITTEN (pfile);
  pfile->token_buffer_size = n + 2 * pfile->token_buffer_size;
  pfile->token_buffer = (U_CHAR *)
    xrealloc(pfile->token_buffer, pfile->token_buffer_size);
  CPP_SET_WRITTEN (pfile, old_written);
}

\f
/*
 * process a given definition string, for initialization
 * If STR is just an identifier, define it with value 1.
 * If STR has anything after the identifier, then it should
 * be identifier=definition.
 */

void
cpp_define (pfile, str)
     cpp_reader *pfile;
     U_CHAR *str;
{
  U_CHAR *buf, *p;

  buf = str;
  p = str;
  if (!is_idstart[*p])
    {
      cpp_error (pfile, "malformed option `-D %s'", str);
      return;
    }
  while (is_idchar[*++p])
    ;
  if (*p == 0)
    {
      buf = (U_CHAR *) alloca (p - buf + 4);
      strcpy ((char *)buf, str);
      strcat ((char *)buf, " 1");
    }
  else if (*p != '=')
    {
      cpp_error (pfile, "malformed option `-D %s'", str);
      return;
    }
  else
    {
      U_CHAR *q;
      /* Copy the entire option so we can modify it.  */
      buf = (U_CHAR *) alloca (2 * strlen (str) + 1);
      strncpy (buf, str, p - str);
      /* Change the = to a space.  */
      buf[p - str] = ' ';
      /* Scan for any backslash-newline and remove it.  */
      p++;
      q = &buf[p - str];
      while (*p)
        {
      if (*p == '\\' && p[1] == '\n')
        p += 2;
      else
        *q++ = *p++;
    }
    *q = 0;
  }
  
  do_define (pfile, NULL, buf, buf + strlen (buf));
}
\f
/* Process the string STR as if it appeared as the body of a #assert.
   OPTION is the option name for which STR was the argument.  */

static void
make_assertion (pfile, option, str)
     cpp_reader *pfile;
     char *option;
     U_CHAR *str;
{
  U_CHAR *buf, *p, *q;

  /* Copy the entire option so we can modify it.  */
  buf = (U_CHAR *) alloca (strlen (str) + 1);
  strcpy ((char *) buf, str);
  /* Scan for any backslash-newline and remove it.  */
  p = q = buf;
  while (*p) {
#if 0
    if (*p == '\\' && p[1] == '\n')
      p += 2;
    else
#endif
      *q++ = *p++;
  }
  *q = 0;

  p = buf;
  if (!is_idstart[*p]) {
    cpp_error (pfile, "malformed option `%s %s'", option, str);
    return;
  }
  while (is_idchar[*++p])
    ;
  while (*p == ' ' || *p == '\t') p++;
  if (! (*p == 0 || *p == '(')) {
    cpp_error (pfile, "malformed option `%s %s'", option, str);
    return;
  }
  
  if (cpp_push_buffer (pfile, buf, strlen (buf)) != NULL)
    {
      do_assert (pfile, NULL, NULL, NULL);
      cpp_pop_buffer (pfile);
    }
}
\f
/* Append a chain of `struct file_name_list's
   to the end of the main include chain.
   FIRST is the beginning of the chain to append, and LAST is the end.  */

static void
append_include_chain (pfile, first, last)
     cpp_reader *pfile;
     struct file_name_list *first, *last;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  struct file_name_list *dir;

  if (!first || !last)
    return;

  if (opts->include == 0)
    opts->include = first;
  else
    opts->last_include->next = first;

  if (opts->first_bracket_include == 0)
    opts->first_bracket_include = first;

  for (dir = first; ; dir = dir->next) {
    int len = strlen (dir->fname) + INCLUDE_LEN_FUDGE;
    if (len > pfile->max_include_len)
      pfile->max_include_len = len;
    if (dir == last)
      break;
  }

  last->next = NULL;
  opts->last_include = last;
}
\f
/* Add output to `deps_buffer' for the -M switch.
   STRING points to the text to be output.
   SPACER is ':' for targets, ' ' for dependencies, zero for text
   to be inserted literally.  */

static void
deps_output (pfile, string, spacer)
     cpp_reader *pfile;
     char *string;
     int spacer;
{
  int size = strlen (string);

  if (size == 0)
    return;

#ifndef MAX_OUTPUT_COLUMNS
#define MAX_OUTPUT_COLUMNS 72
#endif
  if (spacer
      && pfile->deps_column > 0
      && (pfile->deps_column + size) > MAX_OUTPUT_COLUMNS)
    {
      deps_output (pfile, " \\\n  ", 0);
      pfile->deps_column = 0;
    }

  if (pfile->deps_size + size + 8 > pfile->deps_allocated_size)
    {
      pfile->deps_allocated_size = (pfile->deps_size + size + 50) * 2;
      pfile->deps_buffer = (char *) xrealloc (pfile->deps_buffer,
                                              pfile->deps_allocated_size);
    }
  if (spacer == ' ' && pfile->deps_column > 0)
    pfile->deps_buffer[pfile->deps_size++] = ' ';
  bcopy (string, &pfile->deps_buffer[pfile->deps_size], size);
  pfile->deps_size += size;
  pfile->deps_column += size;
  if (spacer == ':')
    pfile->deps_buffer[pfile->deps_size++] = ':';
  pfile->deps_buffer[pfile->deps_size] = 0;
}
\f
/* Given a colon-separated list of file names PATH,
   add all the names to the search path for include files.  */

static void
path_include (pfile, path)
     cpp_reader *pfile;
     char *path;
{
  char *p;

  p = path;

  if (*p)
    while (1) {
      char *q = p;
      char *name;
      struct file_name_list *dirtmp;

      /* Find the end of this name.  */
      while (*q != 0 && *q != PATH_SEPARATOR) q++;
      if (p == q) {
        /* An empty name in the path stands for the current directory.  */
        name = (char *) xmalloc (2);
        name[0] = '.';
        name[1] = 0;
      } else {
        /* Otherwise use the directory that is named.  */
        name = (char *) xmalloc (q - p + 1);
        bcopy (p, name, q - p);
        name[q - p] = 0;
      }

      dirtmp = (struct file_name_list *)
        xmalloc (sizeof (struct file_name_list));
      dirtmp->next = 0;         /* New one goes on the end */
      dirtmp->control_macro = 0;
      dirtmp->c_system_include_path = 0;
      dirtmp->fname = name;
      dirtmp->got_name_map = 0;
      append_include_chain (pfile, dirtmp, dirtmp);

      /* Advance past this name.  */
      p = q;
      if (*p == 0)
        break;
      /* Skip the colon.  */
      p++;
    }
}
\f
void
cpp_options_init (opts)
     cpp_options *opts;
{
  bzero ((char *) opts, sizeof *opts);
  opts->in_fname = NULL;
  opts->out_fname = NULL;

  /* Initialize is_idchar to allow $.  */
  opts->dollars_in_ident = 1;
  initialize_char_syntax (opts);

  opts->no_line_commands = 0;
  opts->no_trigraphs = 1;
  opts->put_out_comments = 0;
  opts->print_include_names = 0;
  opts->dump_macros = dump_none;
  opts->no_output = 0;
  opts->remap = 0;
  opts->cplusplus = 0;
  opts->cplusplus_comments = 0;

  opts->verbose = 0;
  opts->objc = 0;
  opts->lang_asm = 0;
  opts->for_lint = 0;
  opts->chill = 0;
  opts->pedantic_errors = 0;
  opts->inhibit_warnings = 0;
  opts->warn_comments = 0;
  opts->warn_import = 1;
  opts->warnings_are_errors = 0;
}

enum cpp_token
null_underflow (pfile)
     cpp_reader *pfile;
{
  return CPP_EOF;
}

int
null_cleanup (pbuf, pfile)
     cpp_buffer *pbuf;
     cpp_reader *pfile;
{
  return 0;
}

int
macro_cleanup (pbuf, pfile)
     cpp_buffer *pbuf;
     cpp_reader *pfile;
{
  HASHNODE *macro = (HASHNODE *) pbuf->data;
  if (macro->type == T_DISABLED)
    macro->type = T_MACRO;
  if (macro->type != T_MACRO || pbuf->buf != macro->value.defn->expansion)
    free (pbuf->buf);
  return 0;
}

int
file_cleanup (pbuf, pfile)
     cpp_buffer *pbuf;
     cpp_reader *pfile;
{
  if (pbuf->buf)
    {
      free (pbuf->buf);
      pbuf->buf = 0;
    }
  return 0;
}

/* Assuming we have read '/'.
   If this is the start of a comment (followed by '*' or '/'),
   skip to the end of the comment, and return ' '.
   Return EOF if we reached the end of file before the end of the comment.
   If not the start of a comment, return '/'.  */

static int
skip_comment (pfile, linep)
     cpp_reader *pfile;
     long *linep;
{
  int c = 0;
  while (PEEKC() == '\\' && PEEKN(1) == '\n')
    {
      if (linep)
        (*linep)++;
      FORWARD(2);
    }
  if (PEEKC() == '*')
    {
      FORWARD(1);
      for (;;)
        {
          int prev_c = c;
          c = GETC ();
          if (c == EOF)
            return EOF;
          while (c == '\\' && PEEKC() == '\n')
            {
              if (linep)
                (*linep)++;
              FORWARD(1), c = GETC();
            }
          if (prev_c == '*' && c == '/')
            return ' ';
          if (c == '\n' && linep)
            (*linep)++;
        }
    }
  else if (PEEKC() == '/' && CPP_OPTIONS (pfile)->cplusplus_comments)
    {
      FORWARD(1);
      for (;;)
        {
          c = GETC ();
          if (c == EOF)
            return ' '; /* Allow // to be terminated by EOF.  */
          while (c == '\\' && PEEKC() == '\n')
            {
              FORWARD(1);
              c = GETC();
              if (linep)
                (*linep)++;
            }
          if (c == '\n')
            {
              /* Don't consider final '\n' to be part of comment.  */
              FORWARD(-1);
              return ' ';
            }
        }
    }
  else
    return '/';
}     

/* Skip whitespace \-newline and comments.  Does not macro-expand.  */

void
cpp_skip_hspace (pfile)
     cpp_reader *pfile;
{
  while (1)
    {
      int c = PEEKC();
      if (c == EOF)
        return; /* FIXME */
      if (is_hor_space[c])
        {
          if ((c == '\f' || c == '\v') && CPP_PEDANTIC (pfile))
            cpp_pedwarn (pfile, "%s in preprocessing directive",
                         c == '\f' ? "formfeed" : "vertical tab");
          FORWARD(1);
        }
      else if (c == '/')
        {
          FORWARD (1);
          c = skip_comment (pfile, NULL);
          if (c == '/')
            FORWARD(-1);
          if (c == EOF || c == '/')
            return;
        }
      else if (c == '\\' && PEEKN(1) == '\n') {
        FORWARD(2);
      }
      else if (c == '@' && CPP_BUFFER (pfile)->has_escapes
               && is_hor_space[PEEKN(1)])
        FORWARD(2);
      else return;
    }
}

/* Read the rest of the current line.
   The line is appended to PFILE's output buffer.  */

static void
copy_rest_of_line (pfile)
     cpp_reader *pfile;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  for (;;)
    {
      int c = GETC();
      int nextc;
      switch (c)
        {
        case EOF:
          goto end_directive;
        case '\\':
          if (PEEKC() == '\n')
            {
              FORWARD (1);
              continue;
            }
        case '\'':
        case '\"':
          goto scan_directive_token;
          break;
        case '/':
          nextc = PEEKC();
          if (nextc == '*' || (opts->cplusplus_comments && nextc == '/'))
            goto scan_directive_token;
          break;
        case '\f':
        case '\v':
          if (CPP_PEDANTIC (pfile))
            cpp_pedwarn (pfile, "%s in preprocessing directive",
                         c == '\f' ? "formfeed" : "vertical tab");
          break;

        case '\n':
          FORWARD(-1);
          goto end_directive;
        scan_directive_token:
          FORWARD(-1);
          cpp_get_token (pfile);
          continue;
        }
      CPP_PUTC (pfile, c);
    }
 end_directive: ;
  CPP_NUL_TERMINATE (pfile);
}

void
skip_rest_of_line (pfile)
     cpp_reader *pfile;
{
  long old = CPP_WRITTEN (pfile);
  copy_rest_of_line (pfile);
  CPP_SET_WRITTEN (pfile, old);
}

/* Handle a possible # directive.
   '#' has already been read.  */

int
handle_directive (pfile)
     cpp_reader *pfile;
{ int c;
  register struct directive *kt;
  int ident_length;
  long after_ident;
  U_CHAR *ident, *line_end;
  long old_written = CPP_WRITTEN (pfile);

  cpp_skip_hspace (pfile);

  c = PEEKC ();
  if (c >= '0' && c <= '9')
    {
      /* Handle # followed by a line number.  */
      if (CPP_PEDANTIC (pfile))
        cpp_pedwarn (pfile, "`#' followed by integer");
      do_line (pfile, NULL);
      goto done_a_directive;
    }

  /* Now find the directive name.  */
  CPP_PUTC (pfile, '#');
  parse_name (pfile, GETC());
  ident = pfile->token_buffer + old_written + 1;
  ident_length = CPP_PWRITTEN (pfile) - ident;
  if (ident_length == 0 && PEEKC() == '\n')
    {
      /* A line of just `#' becomes blank.  */
      goto done_a_directive;
    }

#if 0
  if (ident_length == 0 || !is_idstart[*ident]) {
    U_CHAR *p = ident;
    while (is_idchar[*p]) {
      if (*p < '0' || *p > '9')
        break;
      p++;
    }
    /* Avoid error for `###' and similar cases unless -pedantic.  */
    if (p == ident) {
      while (*p == '#' || is_hor_space[*p]) p++;
      if (*p == '\n') {
        if (pedantic && !lang_asm)
          cpp_warning (pfile, "invalid preprocessor directive");
        return 0;
      }
    }

    if (!lang_asm)
      cpp_error (pfile, "invalid preprocessor directive name");

    return 0;
  }
#endif
  /*
   * Decode the keyword and call the appropriate expansion
   * routine, after moving the input pointer up to the next line.
   */
  for (kt = directive_table; ; kt++) {
    if (kt->length <= 0)
      goto not_a_directive;
    if (kt->length == ident_length && !strncmp (kt->name, ident, ident_length)) 
      break;
  }

  if (kt->command_reads_line)
    after_ident = 0;
  else
    {
      /* Nonzero means do not delete comments within the directive.
         #define needs this when -traditional.  */
        int comments = CPP_TRADITIONAL (pfile) && kt->type == T_DEFINE;
        int save_put_out_comments = CPP_OPTIONS (pfile)->put_out_comments;
        CPP_OPTIONS (pfile)->put_out_comments = comments;
        after_ident = CPP_WRITTEN (pfile);
        copy_rest_of_line (pfile);
        CPP_OPTIONS (pfile)->put_out_comments = save_put_out_comments;
    }

  /* We may want to pass through #define, #pragma, and #include.
     Other directives may create output, but we don't want the directive
     itself out, so we pop it now.  For example conditionals may emit
     #failed ... #endfailed stuff.  But note that popping the buffer
     means the parameters to kt->func may point after pfile->limit
     so these parameters are invalid as soon as something gets appended
     to the token_buffer.  */

  line_end = CPP_PWRITTEN (pfile);
  if (! (kt->type == T_DEFINE
         || kt->type == T_PRAGMA
         || (IS_INCLUDE_DIRECTIVE_TYPE (kt->type)
             && CPP_OPTIONS (pfile)->dump_includes)))
    CPP_SET_WRITTEN (pfile, old_written);

  (*kt->func) (pfile, kt, pfile->token_buffer + after_ident, line_end);

  if (kt->type == T_DEFINE)
    {
      if (CPP_OPTIONS (pfile)->dump_macros == dump_names)
        {
          /* Skip "#define". */
          U_CHAR *p = pfile->token_buffer + old_written + 7;

          SKIP_WHITE_SPACE (p);
          while (is_idchar[*p]) p++;
          pfile->limit = p;
          CPP_PUTC (pfile, '\n');
        }
      else if (CPP_OPTIONS (pfile)->dump_macros != dump_definitions)
        CPP_SET_WRITTEN (pfile, old_written);
    }

 done_a_directive:
  return 1;

 not_a_directive:
  return 0;
}

/* Pass a directive through to the output file.
   BUF points to the contents of the directive, as a contiguous string.
   LIMIT points to the first character past the end of the directive.
   KEYWORD is the keyword-table entry for the directive.  */

static void
pass_thru_directive (buf, limit, pfile, keyword)
     U_CHAR *buf, *limit;
     cpp_reader *pfile;
     struct directive *keyword;
{
  register unsigned keyword_length = keyword->length;

  CPP_RESERVE (pfile, 1 + keyword_length + (limit - buf));
  CPP_PUTC_Q (pfile, '#');
  CPP_PUTS_Q (pfile, keyword->name, keyword_length);
  if (limit != buf && buf[0] != ' ')
    CPP_PUTC_Q (pfile, ' ');
  CPP_PUTS_Q (pfile, buf, limit - buf);
#if 0
  CPP_PUTS_Q (pfile, '\n');
  /* Count the line we have just made in the output,
     to get in sync properly.  */
  pfile->lineno++;
#endif
}
\f
/* The arglist structure is built by do_define to tell
   collect_definition where the argument names begin.  That
   is, for a define like "#define f(x,y,z) foo+x-bar*y", the arglist
   would contain pointers to the strings x, y, and z.
   Collect_definition would then build a DEFINITION node,
   with reflist nodes pointing to the places x, y, and z had
   appeared.  So the arglist is just convenience data passed
   between these two routines.  It is not kept around after
   the current #define has been processed and entered into the
   hash table.  */

struct arglist {
  struct arglist *next;
  U_CHAR *name;
  int length;
  int argno;
  char rest_args;
};

/* Read a replacement list for a macro with parameters.
   Build the DEFINITION structure.
   Reads characters of text starting at BUF until END.
   ARGLIST specifies the formal parameters to look for
   in the text of the definition; NARGS is the number of args
   in that list, or -1 for a macro name that wants no argument list.
   MACRONAME is the macro name itself (so we can avoid recursive expansion)
   and NAMELEN is its length in characters.
   
   Note that comments, backslash-newlines, and leading white space
   have already been deleted from the argument.  */

static DEFINITION *
collect_expansion (pfile, buf, limit, nargs, arglist)
     cpp_reader *pfile;
     U_CHAR *buf, *limit;
     int nargs;
     struct arglist *arglist;
{
  DEFINITION *defn;
  register U_CHAR *p, *lastp, *exp_p;
  struct reflist *endpat = NULL;
  /* Pointer to first nonspace after last ## seen.  */
  U_CHAR *concat = 0;
  /* Pointer to first nonspace after last single-# seen.  */
  U_CHAR *stringify = 0;
  int maxsize;
  int expected_delimiter = '\0';

  /* Scan thru the replacement list, ignoring comments and quoted
     strings, picking up on the macro calls.  It does a linear search
     thru the arg list on every potential symbol.  Profiling might say
     that something smarter should happen.  */

  if (limit < buf)
    abort ();

  /* Find the beginning of the trailing whitespace.  */
  p = buf;
  while (p < limit && is_space[limit[-1]]) limit--;

  /* Allocate space for the text in the macro definition.
     Leading and trailing whitespace chars need 2 bytes each.
     Each other input char may or may not need 1 byte,
     so this is an upper bound.  The extra 5 are for invented
     leading and trailing newline-marker and final null.  */
  maxsize = (sizeof (DEFINITION)
             + (limit - p) + 5);
  /* Occurrences of '@' get doubled, so allocate extra space for them.  */
  while (p < limit)
    if (*p++ == '@')
      maxsize++;
  defn = (DEFINITION *) xcalloc (1, maxsize);

  defn->nargs = nargs;
  exp_p = defn->expansion = (U_CHAR *) defn + sizeof (DEFINITION);
  lastp = exp_p;

  p = buf;

  /* Add one initial space escape-marker to prevent accidental
     token-pasting (often removed by macroexpand).  */
  *exp_p++ = '@';
  *exp_p++ = ' ';

  if (limit - p >= 2 && p[0] == '#' && p[1] == '#') {
    cpp_error (pfile, "`##' at start of macro definition");
    p += 2;
  }

  /* Process the main body of the definition.  */
  while (p < limit) {
    int skipped_arg = 0;
    register U_CHAR c = *p++;

    *exp_p++ = c;

    if (!CPP_TRADITIONAL (pfile)) {
      switch (c) {
      case '\'':
      case '\"':
        if (expected_delimiter != '\0') {
          if (c == expected_delimiter)
            expected_delimiter = '\0';
        } else
          expected_delimiter = c;
        break;

      case '\\':
        if (p < limit && expected_delimiter) {
          /* In a string, backslash goes through
             and makes next char ordinary.  */
          *exp_p++ = *p++;
        }
        break;

      case '@':
        /* An '@' in a string or character constant stands for itself,
           and does not need to be escaped.  */
        if (!expected_delimiter)
          *exp_p++ = c;
        break;

      case '#':
        /* # is ordinary inside a string.  */
        if (expected_delimiter)
          break;
        if (p < limit && *p == '#') {
          /* ##: concatenate preceding and following tokens.  */
          /* Take out the first #, discard preceding whitespace.  */
          exp_p--;
          while (exp_p > lastp && is_hor_space[exp_p[-1]])
            --exp_p;
          /* Skip the second #.  */
          p++;
          /* Discard following whitespace.  */
          SKIP_WHITE_SPACE (p);
          concat = p;
          if (p == limit)
            cpp_error (pfile, "`##' at end of macro definition");
        } else if (nargs >= 0) {
          /* Single #: stringify following argument ref.
             Don't leave the # in the expansion.  */
          exp_p--;
          SKIP_WHITE_SPACE (p);
          if (p == limit || ! is_idstart[*p]
              || (*p == 'L' && p + 1 < limit && (p[1] == '\'' || p[1] == '"')))
            cpp_error (pfile,
                     "`#' operator is not followed by a macro argument name");
          else
            stringify = p;
        }
        break;
      }
    } else {
      /* In -traditional mode, recognize arguments inside strings and
         and character constants, and ignore special properties of #.
         Arguments inside strings are considered "stringified", but no
         extra quote marks are supplied.  */
      switch (c) {
      case '\'':
      case '\"':
        if (expected_delimiter != '\0') {
          if (c == expected_delimiter)
            expected_delimiter = '\0';
        } else
          expected_delimiter = c;
        break;

      case '\\':
        /* Backslash quotes delimiters and itself, but not macro args.  */
        if (expected_delimiter != 0 && p < limit
            && (*p == expected_delimiter || *p == '\\')) {
          *exp_p++ = *p++;
          continue;
        }
        break;

      case '/':
        if (expected_delimiter != '\0') /* No comments inside strings.  */
          break;
        if (*p == '*') {
          /* If we find a comment that wasn't removed by handle_directive,
             this must be -traditional.  So replace the comment with
             nothing at all.  */
          exp_p--;
          p += 1;
          while (p < limit && !(p[-2] == '*' && p[-1] == '/'))
            p++;
#if 0
          /* Mark this as a concatenation-point, as if it had been ##.  */
          concat = p;
#endif
        }
        break;
      }
    }

    /* Handle the start of a symbol.  */
    if (is_idchar[c] && nargs > 0) {
      U_CHAR *id_beg = p - 1;
      int id_len;

      --exp_p;
      while (p != limit && is_idchar[*p]) p++;
      id_len = p - id_beg;

      if (is_idstart[c]
          && ! (id_len == 1 && c == 'L' && (*p == '\'' || *p == '"'))) {
        register struct arglist *arg;

        for (arg = arglist; arg != NULL; arg = arg->next) {
          struct reflist *tpat;

          if (arg->name[0] == c
              && arg->length == id_len
              && strncmp (arg->name, id_beg, id_len) == 0) {
            if (expected_delimiter && CPP_OPTIONS (pfile)->warn_stringify) {
              if (CPP_TRADITIONAL (pfile)) {
                cpp_warning (pfile, "macro argument `%.*s' is stringified.",
                             id_len, arg->name);
              } else {
                cpp_warning (pfile,
                    "macro arg `%.*s' would be stringified with -traditional.",
                             id_len, arg->name);
              }
            }
            /* If ANSI, don't actually substitute inside a string.  */
            if (!CPP_TRADITIONAL (pfile) && expected_delimiter)
              break;
            /* make a pat node for this arg and append it to the end of
               the pat list */
            tpat = (struct reflist *) xmalloc (sizeof (struct reflist));
            tpat->next = NULL;
            tpat->raw_before = concat == id_beg;
            tpat->raw_after = 0;
            tpat->rest_args = arg->rest_args;
            tpat->stringify = (CPP_TRADITIONAL (pfile)
                               ? expected_delimiter != '\0'
                               : stringify == id_beg);

            if (endpat == NULL)
              defn->pattern = tpat;
            else
              endpat->next = tpat;
            endpat = tpat;

            tpat->argno = arg->argno;
            tpat->nchars = exp_p - lastp;
            {
              register U_CHAR *p1 = p;
              SKIP_WHITE_SPACE (p1);
              if (p1 + 2 <= limit && p1[0] == '#' && p1[1] == '#')
                tpat->raw_after = 1;
            }
            lastp = exp_p;      /* place to start copying from next time */
            skipped_arg = 1;
            break;
          }
        }
      }

      /* If this was not a macro arg, copy it into the expansion.  */
      if (! skipped_arg) {
        register U_CHAR *lim1 = p;
        p = id_beg;
        while (p != lim1)
          *exp_p++ = *p++;
        if (stringify == id_beg)
          cpp_error (pfile,
                   "`#' operator should be followed by a macro argument name");
      }
    }
  }

  if (!CPP_TRADITIONAL (pfile) && expected_delimiter == 0)
    {
      /* If ANSI, put in a "@ " marker to prevent token pasting.
         But not if "inside a string" (which in ANSI mode
         happens only for -D option).  */
      *exp_p++ = '@';
      *exp_p++ = ' ';
    }

  *exp_p = '\0';

  defn->length = exp_p - defn->expansion;

  /* Crash now if we overrun the allocated size.  */
  if (defn->length + 1 > maxsize)
    abort ();

#if 0
/* This isn't worth the time it takes.  */
  /* give back excess storage */
  defn->expansion = (U_CHAR *) xrealloc (defn->expansion, defn->length + 1);
#endif

  return defn;
}

/*
 * special extension string that can be added to the last macro argument to 
 * allow it to absorb the "rest" of the arguments when expanded.  Ex:
 *              #define wow(a, b...)            process (b, a, b)
 *              { wow (1, 2, 3); }      ->      { process (2, 3, 1, 2, 3); }
 *              { wow (one, two); }     ->      { process (two, one, two); }
 * if this "rest_arg" is used with the concat token '##' and if it is not
 * supplied then the token attached to with ## will not be outputted.  Ex:
 *              #define wow (a, b...)           process (b ## , a, ## b)
 *              { wow (1, 2); }         ->      { process (2, 1, 2); }
 *              { wow (one); }          ->      { process (one); {
 */
static char rest_extension[] = "...";
#define REST_EXTENSION_LENGTH   (sizeof (rest_extension) - 1)

/* Create a DEFINITION node from a #define directive.  Arguments are 
   as for do_define.  */

static MACRODEF
create_definition (buf, limit, pfile, predefinition)
     U_CHAR *buf, *limit;
     cpp_reader *pfile;
     int predefinition;
{
  U_CHAR *bp;                   /* temp ptr into input buffer */
  U_CHAR *symname;              /* remember where symbol name starts */
  int sym_length;               /* and how long it is */
  int rest_args = 0;
  long line, col;
  char *file = CPP_BUFFER (pfile) ? CPP_BUFFER (pfile)->nominal_fname : "";
  DEFINITION *defn;
  int arglengths = 0;           /* Accumulate lengths of arg names
                                   plus number of args.  */
  MACRODEF mdef;
  cpp_buf_line_and_col (CPP_BUFFER (pfile), &line, &col);

  bp = buf;

  while (is_hor_space[*bp])
    bp++;

  symname = bp;                 /* remember where it starts */

  sym_length = check_macro_name (pfile, bp, "macro");
  bp += sym_length;

  /* Lossage will occur if identifiers or control keywords are broken
     across lines using backslash.  This is not the right place to take
     care of that.  */

  if (*bp == '(') {
    struct arglist *arg_ptrs = NULL;
    int argno = 0;

    bp++;                       /* skip '(' */
    SKIP_WHITE_SPACE (bp);

    /* Loop over macro argument names.  */
    while (*bp != ')') {
      struct arglist *temp;

      temp = (struct arglist *) alloca (sizeof (struct arglist));
      temp->name = bp;
      temp->next = arg_ptrs;
      temp->argno = argno++;
      temp->rest_args = 0;
      arg_ptrs = temp;

      if (rest_args)
        cpp_pedwarn (pfile, "another parameter follows `%s'", rest_extension);

      if (!is_idstart[*bp])
        cpp_pedwarn (pfile, "invalid character in macro parameter name");
      
      /* Find the end of the arg name.  */
      while (is_idchar[*bp]) {
        bp++;
        /* do we have a "special" rest-args extension here? */
        if (limit - bp > REST_EXTENSION_LENGTH
            && strncmp (rest_extension, bp, REST_EXTENSION_LENGTH) == 0) {
          rest_args = 1;
          temp->rest_args = 1;
          break;
        }
      }
      temp->length = bp - temp->name;
      if (rest_args == 1)
        bp += REST_EXTENSION_LENGTH;
      arglengths += temp->length + 2;
      SKIP_WHITE_SPACE (bp);
      if (temp->length == 0 || (*bp != ',' && *bp != ')')) {
        cpp_error (pfile, "badly punctuated parameter list in `#define'");
        goto nope;
      }
      if (*bp == ',') {
        bp++;
        SKIP_WHITE_SPACE (bp);
      }
      if (bp >= limit) {
        cpp_error (pfile, "unterminated parameter list in `#define'");
        goto nope;
      }
      {
        struct arglist *otemp;

        for (otemp = temp->next; otemp != NULL; otemp = otemp->next)
          if (temp->length == otemp->length
              && strncmp (temp->name, otemp->name, temp->length) == 0) {
              U_CHAR *name;

              name = (U_CHAR *) alloca (temp->length + 1);
              (void) strncpy (name, temp->name, temp->length);
              name[temp->length] = '\0';
              cpp_error (pfile,
                         "duplicate argument name `%s' in `#define'", name);
              goto nope;
          }
      }
    }

    ++bp;                       /* skip paren */
    SKIP_WHITE_SPACE (bp);
    /* now everything from bp before limit is the definition.  */
    defn = collect_expansion (pfile, bp, limit, argno, arg_ptrs);
    defn->rest_args = rest_args;

    /* Now set defn->args.argnames to the result of concatenating
       the argument names in reverse order
       with comma-space between them.  */
    defn->args.argnames = (U_CHAR *) xmalloc (arglengths + 1);
    {
      struct arglist *temp;
      int i = 0;
      for (temp = arg_ptrs; temp; temp = temp->next) {
        bcopy (temp->name, &defn->args.argnames[i], temp->length);
        i += temp->length;
        if (temp->next != 0) {
          defn->args.argnames[i++] = ',';
          defn->args.argnames[i++] = ' ';
        }
      }
      defn->args.argnames[i] = 0;
    }
  } else {
    /* Simple expansion or empty definition.  */

    if (bp < limit)
      {
        if (is_hor_space[*bp]) {
          bp++;
          SKIP_WHITE_SPACE (bp);
        } else {
          switch (*bp) {
            case '!':  case '"':  case '#':  case '%':  case '&':  case '\'':
            case ')':  case '*':  case '+':  case ',':  case '-':  case '.':
            case '/':  case ':':  case ';':  case '<':  case '=':  case '>':
            case '?':  case '[':  case '\\': case ']':  case '^':  case '{':
            case '|':  case '}':  case '~':
              cpp_warning (pfile, "missing white space after `#define %.*s'",
                           sym_length, symname);
              break;

            default:
              cpp_pedwarn (pfile, "missing white space after `#define %.*s'",
                           sym_length, symname);
              break;
          }
        }
      }
    /* now everything from bp before limit is the definition.  */
    defn = collect_expansion (pfile, bp, limit, -1, NULL_PTR);
    defn->args.argnames = (U_CHAR *) "";
  }

  defn->line = line;
  defn->file = file;

  /* OP is null if this is a predefinition */
  defn->predefined = predefinition;
  mdef.defn = defn;
  mdef.symnam = symname;
  mdef.symlen = sym_length;

  return mdef;

 nope:
  mdef.defn = 0;
  return mdef;
}

/* Check a purported macro name SYMNAME, and yield its length.
   USAGE is the kind of name this is intended for.  */

static int
check_macro_name (pfile, symname, usage)
     cpp_reader *pfile;
     U_CHAR *symname;
     char *usage;
{
  U_CHAR *p;
  int sym_length;

  for (p = symname; is_idchar[*p]; p++)
    ;
  sym_length = p - symname;
  if (sym_length == 0
      || (sym_length == 1 && *symname == 'L' && (*p == '\'' || *p == '"')))
    cpp_error (pfile, "invalid %s name", usage);
  else if (!is_idstart[*symname]) {
    U_CHAR *msg;                        /* what pain...  */
    msg = (U_CHAR *) alloca (sym_length + 1);
    bcopy (symname, msg, sym_length);
    msg[sym_length] = 0;
    cpp_error (pfile, "invalid %s name `%s'", usage, msg);
  } else {
    if (! strncmp (symname, "defined", 7) && sym_length == 7)
      cpp_error (pfile, "invalid %s name `defined'", usage);
  }
  return sym_length;
}

/* Return zero if two DEFINITIONs are isomorphic.  */

static int
compare_defs (pfile, d1, d2)
     cpp_reader *pfile;
     DEFINITION *d1, *d2;
{
  register struct reflist *a1, *a2;
  register U_CHAR *p1 = d1->expansion;
  register U_CHAR *p2 = d2->expansion;
  int first = 1;

  if (d1->nargs != d2->nargs)
    return 1;
  if (CPP_PEDANTIC (pfile)
      && strcmp ((char *)d1->args.argnames, (char *)d2->args.argnames))
    return 1;
  for (a1 = d1->pattern, a2 = d2->pattern; a1 && a2;
       a1 = a1->next, a2 = a2->next) {
    if (!((a1->nchars == a2->nchars && ! strncmp (p1, p2, a1->nchars))
          || ! comp_def_part (first, p1, a1->nchars, p2, a2->nchars, 0))
        || a1->argno != a2->argno
        || a1->stringify != a2->stringify
        || a1->raw_before != a2->raw_before
        || a1->raw_after != a2->raw_after)
      return 1;
    first = 0;
    p1 += a1->nchars;
    p2 += a2->nchars;
  }
  if (a1 != a2)
    return 1;
  if (comp_def_part (first, p1, d1->length - (p1 - d1->expansion),
                     p2, d2->length - (p2 - d2->expansion), 1))
    return 1;
  return 0;
}

/* Return 1 if two parts of two macro definitions are effectively different.
   One of the parts starts at BEG1 and has LEN1 chars;
   the other has LEN2 chars at BEG2.
   Any sequence of whitespace matches any other sequence of whitespace.
   FIRST means these parts are the first of a macro definition;
    so ignore leading whitespace entirely.
   LAST means these parts are the last of a macro definition;
    so ignore trailing whitespace entirely.  */

static int
comp_def_part (first, beg1, len1, beg2, len2, last)
     int first;
     U_CHAR *beg1, *beg2;
     int len1, len2;
     int last;
{
  register U_CHAR *end1 = beg1 + len1;
  register U_CHAR *end2 = beg2 + len2;
  if (first) {
    while (beg1 != end1 && is_space[*beg1]) beg1++;
    while (beg2 != end2 && is_space[*beg2]) beg2++;
  }
  if (last) {
    while (beg1 != end1 && is_space[end1[-1]]) end1--;
    while (beg2 != end2 && is_space[end2[-1]]) end2--;
  }
  while (beg1 != end1 && beg2 != end2) {
    if (is_space[*beg1] && is_space[*beg2]) {
      while (beg1 != end1 && is_space[*beg1]) beg1++;
      while (beg2 != end2 && is_space[*beg2]) beg2++;
    } else if (*beg1 == *beg2) {
      beg1++; beg2++;
    } else break;
  }
  return (beg1 != end1) || (beg2 != end2);
}

/* Process a #define command.
BUF points to the contents of the #define command, as a contiguous string.
LIMIT points to the first character past the end of the definition.
KEYWORD is the keyword-table entry for #define,
or NULL for a "predefined" macro.  */

static int
do_define (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  int hashcode;
  MACRODEF mdef;
  HASHNODE *hp;

#if 0
  /* If this is a precompiler run (with -pcp) pass thru #define commands.  */
  if (pcp_outfile && keyword)
    pass_thru_directive (buf, limit, pfile, keyword);
#endif

  mdef = create_definition (buf, limit, pfile, keyword == NULL);
  if (mdef.defn == 0)
    goto nope;

  hashcode = hashf (mdef.symnam, mdef.symlen, HASHSIZE);

  if ((hp = cpp_lookup (pfile, mdef.symnam, mdef.symlen, hashcode)) != NULL)
    {
      int ok = 0;
      /* Redefining a precompiled key is ok.  */
      if (hp->type == T_PCSTRING)
        ok = 1;
      /* Redefining a macro is ok if the definitions are the same.  */
      else if (hp->type == T_MACRO)
        ok = ! compare_defs (pfile, mdef.defn, hp->value.defn);
      /* Redefining a constant is ok with -D.  */
      else if (hp->type == T_CONST)
        ok = ! CPP_OPTIONS (pfile)->done_initializing;
      /* Print the warning if it's not ok.  */
      if (!ok)
        {
          U_CHAR *msg;          /* what pain...  */

          /* If we are passing through #define and #undef directives, do
             that for this re-definition now.  */
          if (CPP_OPTIONS (pfile)->debug_output && keyword)
            pass_thru_directive (buf, limit, pfile, keyword);

          msg = (U_CHAR *) alloca (mdef.symlen + 22);
          *msg = '`';
          bcopy (mdef.symnam, msg + 1, mdef.symlen);
          strcpy ((char *) (msg + mdef.symlen + 1), "' redefined");
          cpp_pedwarn (pfile, msg);
          if (hp->type == T_MACRO)
            cpp_pedwarn_with_file_and_line (pfile, hp->value.defn->file, hp->value.defn->line,
                                      "this is the location of the previous definition");
        }
      /* Replace the old definition.  */
      hp->type = T_MACRO;
      hp->value.defn = mdef.defn;
    }
  else
    {
      /* If we are passing through #define and #undef directives, do
         that for this new definition now.  */
      if (CPP_OPTIONS (pfile)->debug_output && keyword)
        pass_thru_directive (buf, limit, pfile, keyword);
      install (mdef.symnam, mdef.symlen, T_MACRO, 0,
               (char *) mdef.defn, hashcode);
    }

  return 0;

nope:

  return 1;
}

/* This structure represents one parsed argument in a macro call.
   `raw' points to the argument text as written (`raw_length' is its length).
   `expanded' points to the argument's macro-expansion
   (its length is `expand_length').
   `stringified_length' is the length the argument would have
   if stringified.
   `use_count' is the number of times this macro arg is substituted
   into the macro.  If the actual use count exceeds 10, 
   the value stored is 10.  */

/* raw and expanded are relative to ARG_BASE */
#define ARG_BASE ((pfile)->token_buffer)

struct argdata {
  /* Strings relative to pfile->token_buffer */
  long raw, expanded, stringified;
  int raw_length, expand_length;
  int stringified_length;
  char newlines;
  char use_count;
};

/* Allocate a new cpp_buffer for PFILE, and push it on the input buffer stack.
   If BUFFER != NULL, then use the LENGTH characters in BUFFER
   as the new input buffer.
   Return the new buffer, or NULL on failure.  */

cpp_buffer *
cpp_push_buffer (pfile, buffer, length)
     cpp_reader *pfile;
     U_CHAR *buffer;
     long length;
{
  register cpp_buffer *buf = CPP_BUFFER (pfile);
  if (buf == pfile->buffer_stack)
    {
      cpp_fatal (pfile, "%s: macro or `#include' recursion too deep",
                 buf->fname);
      return NULL;
    }
  buf--;
  bzero ((char *) buf, sizeof (cpp_buffer));
  CPP_BUFFER (pfile) = buf;
  buf->if_stack = pfile->if_stack;
  buf->cleanup = null_cleanup;
  buf->underflow = null_underflow;
  buf->buf = buf->cur = buffer;
  buf->alimit = buf->rlimit = buffer + length;
  
  return buf;
}

cpp_buffer *
cpp_pop_buffer (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *buf = CPP_BUFFER (pfile);
  (*buf->cleanup) (buf, pfile);
  return ++CPP_BUFFER (pfile);
}

/* Scan until CPP_BUFFER (PFILE) is exhausted into PFILE->token_buffer.
   Pop the buffer when done.  */

void
cpp_scan_buffer (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *buffer = CPP_BUFFER (pfile);
  for (;;)
    {
      enum cpp_token token = cpp_get_token (pfile);
      if (token == CPP_EOF) /* Should not happen ...  */
        break;
      if (token == CPP_POP && CPP_BUFFER (pfile) == buffer)
        {
          cpp_pop_buffer (pfile);
          break;
        }
    }
}

/*
 * Rescan a string (which may have escape marks) into pfile's buffer.
 * Place the result in pfile->token_buffer.
 *
 * The input is copied before it is scanned, so it is safe to pass
 * it something from the token_buffer that will get overwritten
 * (because it follows CPP_WRITTEN).  This is used by do_include.
 */

static void
cpp_expand_to_buffer (pfile, buf, length)
     cpp_reader *pfile;
     U_CHAR *buf;
     int length;
{
  register cpp_buffer *ip;
#if 0
  cpp_buffer obuf;
#endif
  U_CHAR *limit = buf + length;
  U_CHAR *buf1;
#if 0
  int odepth = indepth;
#endif

  if (length < 0)
    abort ();

  /* Set up the input on the input stack.  */

  buf1 = (U_CHAR *) alloca (length + 1);
  {
    register U_CHAR *p1 = buf;
    register U_CHAR *p2 = buf1;

    while (p1 != limit)
      *p2++ = *p1++;
  }
  buf1[length] = 0;

  ip = cpp_push_buffer (pfile, buf1, length);
  if (ip == NULL)
    return;
  ip->has_escapes = 1;
#if 0
  ip->lineno = obuf.lineno = 1;
#endif

  /* Scan the input, create the output.  */
  cpp_scan_buffer (pfile);

#if 0
  if (indepth != odepth)
    abort ();
#endif

  CPP_NUL_TERMINATE (pfile);
}

\f
static void
adjust_position (buf, limit, linep, colp)
     U_CHAR *buf;
     U_CHAR *limit;
     long *linep;
     long *colp;
{
  while (buf < limit)
    {
      U_CHAR ch = *buf++;
      if (ch == '\n')
        (*linep)++, (*colp) = 1;
      else
        (*colp)++;
    }
}

/* Move line_base forward, updating lineno and colno.  */

static void
update_position (pbuf)
     register cpp_buffer *pbuf;
{
  unsigned char *old_pos = pbuf->buf + pbuf->line_base;
  unsigned char *new_pos = pbuf->cur;
  register struct parse_marker *mark;
  for (mark = pbuf->marks;  mark != NULL; mark = mark->next)
    {
      if (pbuf->buf + mark->position < new_pos)
        new_pos = pbuf->buf + mark->position;
    }
  pbuf->line_base += new_pos - old_pos;
  adjust_position (old_pos, new_pos, &pbuf->lineno, &pbuf->colno);
}

void
cpp_buf_line_and_col (pbuf, linep, colp)
     register cpp_buffer *pbuf;
     long *linep, *colp;
{
  long dummy;
  if (colp == NULL)
    colp = &dummy;
  if (pbuf)
    {
      *linep = pbuf->lineno;
      *colp = pbuf->colno;
      adjust_position (pbuf->buf + pbuf->line_base, pbuf->cur, linep, colp);
    }
  else
    {
      *linep = 0;
      *colp = 0;
    }
}

/* Return the cpp_buffer that corresponds to a file (not a macro).  */

cpp_buffer *
cpp_file_buffer (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *ip = CPP_BUFFER (pfile);

  for ( ; ip != CPP_NULL_BUFFER (pfile); ip = CPP_PREV_BUFFER (ip))
    if (ip->fname != NULL)
      return ip;
  return NULL;
}

static long
count_newlines (buf, limit)
     register U_CHAR *buf;
     register U_CHAR *limit;
{
  register long count = 0;
  while (buf < limit)
    {
      U_CHAR ch = *buf++;
      if (ch == '\n')
        count++;
    }
  return count;
}

/*
 * write out a #line command, for instance, after an #include file.
 * If CONDITIONAL is nonzero, we can omit the #line if it would
 * appear to be a no-op, and we can output a few newlines instead
 * if we want to increase the line number by a small amount.
 * FILE_CHANGE says whether we are entering a file, leaving, or neither.
 */

static void
output_line_command (pfile, conditional, file_change)
     cpp_reader *pfile;
     int conditional;
     enum file_change_code file_change;
{
  long line, col;
  cpp_buffer *ip = CPP_BUFFER (pfile);

  if (ip->fname == NULL)
    return;

  update_position (ip);

  if (CPP_OPTIONS (pfile)->no_line_commands
      || CPP_OPTIONS (pfile)->no_output)
    return;

  line = CPP_BUFFER (pfile)->lineno;
  col = CPP_BUFFER (pfile)->colno;
  adjust_position (CPP_LINE_BASE (ip), ip->cur, &line, &col);

  if (CPP_OPTIONS (pfile)->no_line_commands)
    return;

  if (conditional) {
    if (line == pfile->lineno)
      return;

    /* If the inherited line number is a little too small,
       output some newlines instead of a #line command.  */
    if (line > pfile->lineno && line < pfile->lineno + 8) {
      CPP_RESERVE (pfile, 20);
      while (line > pfile->lineno) {
        CPP_PUTC_Q (pfile, '\n');
        pfile->lineno++;
      }
      return;
    }
  }

#if 0
  /* Don't output a line number of 0 if we can help it.  */
  if (ip->lineno == 0 && ip->bufp - ip->buf < ip->length
      && *ip->bufp == '\n') {
    ip->lineno++;
    ip->bufp++;
  }
#endif

  CPP_RESERVE (pfile, 4 * strlen (ip->nominal_fname) + 50);
  {
#ifdef OUTPUT_LINE_COMMANDS
    static char sharp_line[] = "#line ";
#else
    static char sharp_line[] = "# ";
#endif
    CPP_PUTS_Q (pfile, sharp_line, sizeof(sharp_line)-1);
  }

  sprintf ((char *) CPP_PWRITTEN (pfile), "%ld ", line);
  CPP_ADJUST_WRITTEN (pfile, strlen (CPP_PWRITTEN (pfile)));

  quote_string (pfile, ip->nominal_fname); 
  if (file_change != same_file) {
    CPP_PUTC_Q (pfile, ' ');
    CPP_PUTC_Q (pfile, file_change == enter_file ? '1' : '2');
  }
  /* Tell cc1 if following text comes from a system header file.  */
  if (ip->system_header_p) {
    CPP_PUTC_Q (pfile, ' ');
    CPP_PUTC_Q (pfile, '3');
  }
#ifndef NO_IMPLICIT_EXTERN_C
  /* Tell cc1plus if following text should be treated as C.  */
  if (ip->system_header_p == 2 && CPP_OPTIONS (pfile)->cplusplus) {
    CPP_PUTC_Q (pfile, ' ');
    CPP_PUTC_Q (pfile, '4');
  }
#endif
  CPP_PUTC_Q (pfile, '\n');
  pfile->lineno = line;
}
\f
/*
 * Parse a macro argument and append the info on PFILE's token_buffer.
 * REST_ARGS means to absorb the rest of the args.
 * Return nonzero to indicate a syntax error.
 */

static enum cpp_token
macarg (pfile, rest_args)
     cpp_reader *pfile;
     int rest_args;
{
  int paren = 0;
  enum cpp_token token;
  char save_put_out_comments = CPP_OPTIONS (pfile)->put_out_comments;
  CPP_OPTIONS (pfile)->put_out_comments = 0;

  /* Try to parse as much of the argument as exists at this
     input stack level.  */
  pfile->no_macro_expand++;
  for (;;)
    {
      token = cpp_get_token (pfile);
      switch (token)
        {
        case CPP_EOF:
          goto done;
        case CPP_POP:
          /* If we've hit end of file, it's an error (reported by caller).
             Ditto if it's the end of cpp_expand_to_buffer text.
             If we've hit end of macro, just continue.  */
          if (! CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
            goto done;
          break;
        case CPP_LPAREN:
          paren++;
          break;
        case CPP_RPAREN:
          if (--paren < 0)
            goto found;
          break;
        case CPP_COMMA:
          /* if we've returned to lowest level and
             we aren't absorbing all args */
          if (paren == 0 && rest_args == 0)
            goto found;
          break;
        found:
          /* Remove ',' or ')' from argument buffer.  */
          CPP_ADJUST_WRITTEN (pfile, -1);
          goto done;
      default: ;
        }
    }

 done:
  CPP_OPTIONS (pfile)->put_out_comments = save_put_out_comments;
  pfile->no_macro_expand--;

  return token;
}
\f
/* Turn newlines to spaces in the string of length LENGTH at START,
   except inside of string constants.
   The string is copied into itself with its beginning staying fixed.  */

static int
change_newlines (start, length)
     U_CHAR *start;
     int length;
{
  register U_CHAR *ibp;
  register U_CHAR *obp;
  register U_CHAR *limit;
  register int c;

  ibp = start;
  limit = start + length;
  obp = start;

  while (ibp < limit) {
    *obp++ = c = *ibp++;
    switch (c) {

    case '\'':
    case '\"':
      /* Notice and skip strings, so that we don't delete newlines in them.  */
      {
        int quotec = c;
        while (ibp < limit) {
          *obp++ = c = *ibp++;
          if (c == quotec)
            break;
          if (c == '\n' && quotec == '\'')
            break;
        }
      }
      break;
    }
  }

  return obp - start;
}

\f
static struct tm *
timestamp (pfile)
     cpp_reader *pfile;
{
  if (!pfile->timebuf) {
    time_t t = time ((time_t *) 0);
    pfile->timebuf = localtime (&t);
  }
  return pfile->timebuf;
}

static char *monthnames[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
                             "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
                            };

/*
 * expand things like __FILE__.  Place the expansion into the output
 * buffer *without* rescanning.
 */

static void
special_symbol (hp, pfile)
     HASHNODE *hp;
     cpp_reader *pfile;
{
  char *buf;
  int len;
  int true_indepth;
  cpp_buffer *ip = NULL;
  struct tm *timebuf;

  int paren = 0;                /* For special `defined' keyword */

#if 0
  if (pcp_outfile && pcp_inside_if
      && hp->type != T_SPEC_DEFINED && hp->type != T_CONST)
    cpp_error (pfile,
               "Predefined macro `%s' used inside `#if' during precompilation",
               hp->name);
#endif
    
  for (ip = CPP_BUFFER (pfile); ; ip = CPP_PREV_BUFFER (ip))
    {
      if (ip == CPP_NULL_BUFFER (pfile))
        {
          cpp_error (pfile, "cccp error: not in any file?!");
          return;                       /* the show must go on */
        }
      if (ip->fname != NULL)
        break;
    }

  switch (hp->type)
    {
    case T_FILE:
    case T_BASE_FILE:
      {
        char *string;
        if (hp->type == T_BASE_FILE)
          {
            while (CPP_PREV_BUFFER (ip) != CPP_NULL_BUFFER (pfile))
              ip = CPP_PREV_BUFFER (ip);
          }
        string = ip->nominal_fname;

        if (!string)
          string = "";
        CPP_RESERVE (pfile, 3 + 4 * strlen (string));
        quote_string (pfile, string);
        return;
      }

    case T_INCLUDE_LEVEL:
      true_indepth = 0;
      ip = CPP_BUFFER (pfile);
      for (;  ip != CPP_NULL_BUFFER (pfile); ip = CPP_PREV_BUFFER (ip))
        if (ip->fname != NULL)
          true_indepth++;

      buf = (char *) alloca (8); /* Eight bytes ought to be more than enough */
      sprintf (buf, "%d", true_indepth - 1);
      break;

  case T_VERSION:
      buf = (char *) alloca (3 + strlen (version_string));
      sprintf (buf, "\"%s\"", version_string);
      break;

#ifndef NO_BUILTIN_SIZE_TYPE
    case T_SIZE_TYPE:
      buf = SIZE_TYPE;
      break;
#endif

#ifndef NO_BUILTIN_PTRDIFF_TYPE
    case T_PTRDIFF_TYPE:
      buf = PTRDIFF_TYPE;
      break;
#endif

    case T_WCHAR_TYPE:
      buf = CPP_WCHAR_TYPE (pfile);
    break;

    case T_USER_LABEL_PREFIX_TYPE:
      buf = USER_LABEL_PREFIX;
      break;

    case T_REGISTER_PREFIX_TYPE:
      buf = REGISTER_PREFIX;
      break;

  case T_CONST:
      buf = (char *) alloca (4 * sizeof (int));
      sprintf (buf, "%d", hp->value.ival);
#ifdef STDC_0_IN_SYSTEM_HEADERS
      if (ip->system_header_p
          && hp->length == 8 && bcmp (hp->name, "__STDC__", 8) == 0
          && ! cpp_lookup (pfile, (U_CHAR *) "__STRICT_ANSI__", -1, -1))
        strcpy (buf, "0");
#endif
#if 0
      if (pcp_inside_if && pcp_outfile)
        /* Output a precondition for this macro use */
        fprintf (pcp_outfile, "#define %s %d\n", hp->name, hp->value.ival);
#endif
      break;

    case T_SPECLINE:
      {
        long line = ip->lineno;
        long col = ip->colno;
        adjust_position (CPP_LINE_BASE (ip), ip->cur, &line, &col);

        buf = (char *) alloca (10);
        sprintf (buf, "%ld", line);
      }
      break;

    case T_DATE:
    case T_TIME:
      buf = (char *) alloca (20);
      timebuf = timestamp (pfile);
      if (hp->type == T_DATE)
        sprintf (buf, "\"%s %2d %4d\"", monthnames[timebuf->tm_mon],
                 timebuf->tm_mday, timebuf->tm_year + 1900);
      else
        sprintf (buf, "\"%02d:%02d:%02d\"", timebuf->tm_hour, timebuf->tm_min,
                 timebuf->tm_sec);
      break;

    case T_SPEC_DEFINED:
      buf = " 0 ";              /* Assume symbol is not defined */
      ip = CPP_BUFFER (pfile);
      SKIP_WHITE_SPACE (ip->cur);
      if (*ip->cur == '(')
        {
          paren++;
          ip->cur++;                    /* Skip over the paren */
          SKIP_WHITE_SPACE (ip->cur);
        }

      if (!is_idstart[*ip->cur])
        goto oops;
      if (ip->cur[0] == 'L' && (ip->cur[1] == '\'' || ip->cur[1] == '"'))
        goto oops;
      if ((hp = cpp_lookup (pfile, ip->cur, -1, -1)))
        {
#if 0
          if (pcp_outfile && pcp_inside_if
              && (hp->type == T_CONST
                  || (hp->type == T_MACRO && hp->value.defn->predefined)))
            /* Output a precondition for this macro use.  */
            fprintf (pcp_outfile, "#define %s\n", hp->name);
#endif
          buf = " 1 ";
        }
#if 0
      else
        if (pcp_outfile && pcp_inside_if)
          {
            /* Output a precondition for this macro use */
            U_CHAR *cp = ip->bufp;
            fprintf (pcp_outfile, "#undef ");
            while (is_idchar[*cp]) /* Ick! */
              fputc (*cp++, pcp_outfile);
            putc ('\n', pcp_outfile);
          }
#endif
      while (is_idchar[*ip->cur])
        ++ip->cur;
      SKIP_WHITE_SPACE (ip->cur);
      if (paren)
        {
          if (*ip->cur != ')')
            goto oops;
          ++ip->cur;
        }
      break;

    oops:

      cpp_error (pfile, "`defined' without an identifier");
      break;

    default:
      cpp_error (pfile, "cccp error: invalid special hash type"); /* time for gdb */
      abort ();
    }
  len = strlen (buf);
  CPP_RESERVE (pfile, len + 1);
  CPP_PUTS_Q (pfile, buf, len);
  CPP_NUL_TERMINATE_Q (pfile);

  return;
}

/* Write out a #define command for the special named MACRO_NAME
   to PFILE's token_buffer.  */

static void
dump_special_to_buffer (pfile, macro_name)
     cpp_reader *pfile;
     char *macro_name;
{
  static char define_directive[] = "#define ";
  int macro_name_length = strlen (macro_name);
  output_line_command (pfile, 0, same_file);
  CPP_RESERVE (pfile, sizeof(define_directive) + macro_name_length);
  CPP_PUTS_Q (pfile, define_directive, sizeof(define_directive)-1);
  CPP_PUTS_Q (pfile, macro_name, macro_name_length);
  CPP_PUTC_Q (pfile, ' ');
  cpp_expand_to_buffer (pfile, macro_name, macro_name_length);
  CPP_PUTC (pfile, '\n');
}

/* Initialize the built-in macros.  */

static void
initialize_builtins (pfile)
     cpp_reader *pfile;
{
  install ((U_CHAR *)"__LINE__", -1, T_SPECLINE, 0, 0, -1);
  install ((U_CHAR *)"__DATE__", -1, T_DATE, 0, 0, -1);
  install ((U_CHAR *)"__FILE__", -1, T_FILE, 0, 0, -1);
  install ((U_CHAR *)"__BASE_FILE__", -1, T_BASE_FILE, 0, 0, -1);
  install ((U_CHAR *)"__INCLUDE_LEVEL__", -1, T_INCLUDE_LEVEL, 0, 0, -1);
  install ((U_CHAR *)"__VERSION__", -1, T_VERSION, 0, 0, -1);
#ifndef NO_BUILTIN_SIZE_TYPE
  install ((U_CHAR *)"__SIZE_TYPE__", -1, T_SIZE_TYPE, 0, 0, -1);
#endif
#ifndef NO_BUILTIN_PTRDIFF_TYPE
  install ((U_CHAR *)"__PTRDIFF_TYPE__ ", -1, T_PTRDIFF_TYPE, 0, 0, -1);
#endif
  install ((U_CHAR *)"__WCHAR_TYPE__", -1, T_WCHAR_TYPE, 0, 0, -1);
  install ((U_CHAR *)"__USER_LABEL_PREFIX__", -1, T_USER_LABEL_PREFIX_TYPE, 0, 0, -1);
  install ((U_CHAR *)"__REGISTER_PREFIX__", -1, T_REGISTER_PREFIX_TYPE, 0, 0, -1);
  install ((U_CHAR *)"__TIME__", -1, T_TIME, 0, 0, -1);
  if (!CPP_TRADITIONAL (pfile))
    install ((U_CHAR *)"__STDC__", -1, T_CONST, STDC_VALUE, 0, -1);
  if (CPP_OPTIONS (pfile)->objc)
    install ((U_CHAR *)"__OBJC__", -1, T_CONST, 1, 0, -1);
/*  This is supplied using a -D by the compiler driver
    so that it is present only when truly compiling with GNU C.  */
/*  install ("__GNUC__", -1, T_CONST, 2, 0, -1);  */

  if (CPP_OPTIONS (pfile)->debug_output)
    {
      dump_special_to_buffer (pfile, "__BASE_FILE__");
      dump_special_to_buffer (pfile, "__VERSION__");
#ifndef NO_BUILTIN_SIZE_TYPE
      dump_special_to_buffer (pfile, "__SIZE_TYPE__");
#endif
#ifndef NO_BUILTIN_PTRDIFF_TYPE
      dump_special_to_buffer (pfile, "__PTRDIFF_TYPE__");
#endif
      dump_special_to_buffer (pfile, "__WCHAR_TYPE__");
      dump_special_to_buffer (pfile, "__DATE__");
      dump_special_to_buffer (pfile, "__TIME__");
      if (!CPP_TRADITIONAL (pfile))
        dump_special_to_buffer (pfile, "__STDC__");
      if (CPP_OPTIONS (pfile)->objc)
        dump_special_to_buffer (pfile, "__OBJC__");
    }
}
\f
/* Return 1 iff a token ending in C1 followed directly by a token C2
   could cause mis-tokenization.  */

static int
unsafe_chars (c1, c2)
     int c1, c2;
{
  switch (c1)
    {
    case '+': case '-':
      if (c2 == c1 || c2 == '=')
        return 1;
      goto letter;
    case '.':
    case '0': case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9':
    case 'e': case 'E': case 'p': case 'P':
      if (c2 == '-' || c2 == '+')
        return 1; /* could extend a pre-processing number */
      goto letter;
    case 'L':
      if (c2 == '\'' || c2 == '\"')
        return 1;   /* Could turn into L"xxx" or L'xxx'.  */
      goto letter;
    letter:
    case '_':
    case 'a': case 'b': case 'c': case 'd':           case 'f':
    case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
    case 'm': case 'n': case 'o':           case 'q': case 'r':
    case 's': case 't': case 'u': case 'v': case 'w': case 'x':
    case 'y': case 'z':
    case 'A': case 'B': case 'C': case 'D':           case 'F':
    case 'G': case 'H': case 'I': case 'J': case 'K':
    case 'M': case 'N': case 'O':           case 'Q': case 'R':
    case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
    case 'Y': case 'Z':
      /* We're in the middle of either a name or a pre-processing number.  */
      return (is_idchar[c2] || c2 == '.');
    case '<': case '>': case '!': case '%': case '#': case ':':
    case '^': case '&': case '|': case '*': case '/': case '=':
      return (c2 == c1 || c2 == '=');
    }
  return 0;
}

/* Expand a macro call.
   HP points to the symbol that is the macro being called.
   Put the result of expansion onto the input stack
   so that subsequent input by our caller will use it.

   If macro wants arguments, caller has already verified that
   an argument list follows; arguments come from the input stack.  */

static void
macroexpand (pfile, hp)
     cpp_reader *pfile;
     HASHNODE *hp;
{
  int nargs;
  DEFINITION *defn = hp->value.defn;
  register U_CHAR *xbuf;
  long start_line, start_column;
  int xbuf_len;
  struct argdata *args;
  long old_written = CPP_WRITTEN (pfile);
#if 0
  int start_line = instack[indepth].lineno;
#endif
  int rest_args, rest_zero;
      register int i;

#if 0
  CHECK_DEPTH (return;);
#endif

#if 0
  /* This macro is being used inside a #if, which means it must be */
  /* recorded as a precondition.  */
  if (pcp_inside_if && pcp_outfile && defn->predefined)
    dump_single_macro (hp, pcp_outfile);
#endif

  pfile->output_escapes++;
  cpp_buf_line_and_col (cpp_file_buffer (pfile), &start_line, &start_column);

  nargs = defn->nargs;

  if (nargs >= 0)
    {
      enum cpp_token token;

      args = (struct argdata *) alloca ((nargs + 1) * sizeof (struct argdata));

      for (i = 0; i < nargs; i++)
        {
          args[i].raw = args[i].expanded = 0;
          args[i].raw_length = 0; 
          args[i].expand_length = args[i].stringified_length = -1;
          args[i].use_count = 0;
        }

      /* Parse all the macro args that are supplied.  I counts them.
         The first NARGS args are stored in ARGS.
         The rest are discarded.  If rest_args is set then we assume
         macarg absorbed the rest of the args.  */
      i = 0;
      rest_args = 0;
      rest_args = 0;
      FORWARD(1); /* Discard the open-parenthesis before the first arg.  */
      do
        {
          if (rest_args)
            continue;
          if (i < nargs || (nargs == 0 && i == 0))
            {
              /* if we are working on last arg which absorbs rest of args... */
              if (i == nargs - 1 && defn->rest_args)
                rest_args = 1;
              args[i].raw = CPP_WRITTEN (pfile);
              token = macarg (pfile, rest_args);
              args[i].raw_length = CPP_WRITTEN (pfile) - args[i].raw;
              args[i].newlines = 0; /* FIXME */
            }
          else
            token = macarg (pfile, 0);
          if (token == CPP_EOF || token == CPP_POP)
            {
              cpp_error_with_line (pfile, start_line, start_column,
                                   "unterminated macro call");
              return;
            }
          i++;
        } while (token == CPP_COMMA);

      /* If we got one arg but it was just whitespace, call that 0 args.  */
      if (i == 1)
        {
          register U_CHAR *bp = ARG_BASE + args[0].raw;
          register U_CHAR *lim = bp + args[0].raw_length;
          /* cpp.texi says for foo ( ) we provide one argument.
             However, if foo wants just 0 arguments, treat this as 0.  */
          if (nargs == 0)
            while (bp != lim && is_space[*bp]) bp++;
          if (bp == lim)
            i = 0;
        }

      /* Don't output an error message if we have already output one for
         a parse error above.  */
      rest_zero = 0;
      if (nargs == 0 && i > 0)
        {
          cpp_error (pfile, "arguments given to macro `%s'", hp->name);
        }
      else if (i < nargs)
        {
          /* traditional C allows foo() if foo wants one argument.  */
          if (nargs == 1 && i == 0 && CPP_TRADITIONAL (pfile))
            ;
          /* the rest args token is allowed to absorb 0 tokens */
          else if (i == nargs - 1 && defn->rest_args)
            rest_zero = 1;
          else if (i == 0)
            cpp_error (pfile, "macro `%s' used without args", hp->name);
          else if (i == 1)
            cpp_error (pfile, "macro `%s' used with just one arg", hp->name);
          else
            cpp_error (pfile, "macro `%s' used with only %d args",
                       hp->name, i);
      }
      else if (i > nargs)
        {
          cpp_error (pfile,
                     "macro `%s' used with too many (%d) args", hp->name, i);
        }
    }

  /* If macro wants zero args, we parsed the arglist for checking only.
     Read directly from the macro definition.  */
  if (nargs <= 0)
    {
      xbuf = defn->expansion;
      xbuf_len = defn->length;
    }
  else
    {
      register U_CHAR *exp = defn->expansion;
      register int offset;      /* offset in expansion,
                                   copied a piece at a time */
      register int totlen;      /* total amount of exp buffer filled so far */

      register struct reflist *ap, *last_ap;

      /* Macro really takes args.  Compute the expansion of this call.  */

      /* Compute length in characters of the macro's expansion.
         Also count number of times each arg is used.  */
      xbuf_len = defn->length;
      for (ap = defn->pattern; ap != NULL; ap = ap->next)
        {
          if (ap->stringify)
            {
              register struct argdata *arg = &args[ap->argno];
              /* Stringify it it hasn't already been */
              if (arg->stringified_length < 0)
                {
                  int arglen = arg->raw_length;
                  int escaped = 0;
                  int in_string = 0;
                  int c;
                  /* Initially need_space is -1.  Otherwise, 1 means the
                     previous character was a space, but we suppressed it;
                     0 means the previous character was a non-space.  */
                  int need_space = -1;
                  i = 0;
                  arg->stringified = CPP_WRITTEN (pfile);
                  if (!CPP_TRADITIONAL (pfile))
                    CPP_PUTC (pfile, '\"'); /* insert beginning quote */
                  for (; i < arglen; i++)
                    {
                      c = (ARG_BASE + arg->raw)[i];

                      if (! in_string)
                        {
                          /* Internal sequences of whitespace are replaced by
                             one space except within an string or char token.*/
                          if (is_space[c])
                            {
                              if (CPP_WRITTEN (pfile) > arg->stringified
                                  && (CPP_PWRITTEN (pfile))[-1] == '@')
                                {
                                  /* "@ " escape markers are removed */
                                  CPP_ADJUST_WRITTEN (pfile, -1);
                                  continue;
                                }
                              if (need_space == 0)
                                need_space = 1;
                              continue;
                            }
                          else if (need_space > 0)
                            CPP_PUTC (pfile, ' ');
                          need_space = 0;
                        }

                      if (escaped)
                        escaped = 0;
                      else
                        {
                          if (c == '\\')
                            escaped = 1;
                          if (in_string)
                            {
                              if (c == in_string)
                                in_string = 0;
                            }
                          else if (c == '\"' || c == '\'')
                            in_string = c;
                        }

                      /* Escape these chars */
                      if (c == '\"' || (in_string && c == '\\'))
                        CPP_PUTC (pfile, '\\');
                      if (isprint (c))
                        CPP_PUTC (pfile, c);
                      else
                        {
                          CPP_RESERVE (pfile, 4);
                          sprintf ((char *)CPP_PWRITTEN (pfile), "\\%03o",
                                   (unsigned int) c);
                          CPP_ADJUST_WRITTEN (pfile, 4);
                        }
                    }
                  if (!CPP_TRADITIONAL (pfile))
                    CPP_PUTC (pfile, '\"'); /* insert ending quote */
                  arg->stringified_length
                    = CPP_WRITTEN (pfile) - arg->stringified;
                }
              xbuf_len += args[ap->argno].stringified_length;
            }
          else if (ap->raw_before || ap->raw_after || CPP_TRADITIONAL (pfile))
            /* Add 4 for two newline-space markers to prevent
               token concatenation.  */
            xbuf_len += args[ap->argno].raw_length + 4;
          else
            {
              /* We have an ordinary (expanded) occurrence of the arg.
                 So compute its expansion, if we have not already.  */
              if (args[ap->argno].expand_length < 0)
                {
                  args[ap->argno].expanded = CPP_WRITTEN (pfile);
                  cpp_expand_to_buffer (pfile,
                                        ARG_BASE + args[ap->argno].raw,
                                        args[ap->argno].raw_length);

                  args[ap->argno].expand_length
                    = CPP_WRITTEN (pfile) - args[ap->argno].expanded;
                }

              /* Add 4 for two newline-space markers to prevent
                 token concatenation.  */
              xbuf_len += args[ap->argno].expand_length + 4;
            }
          if (args[ap->argno].use_count < 10)
            args[ap->argno].use_count++;
        }

      xbuf = (U_CHAR *) xmalloc (xbuf_len + 1);

      /* Generate in XBUF the complete expansion
         with arguments substituted in.
         TOTLEN is the total size generated so far.
         OFFSET is the index in the definition
         of where we are copying from.  */
      offset = totlen = 0;
      for (last_ap = NULL, ap = defn->pattern; ap != NULL;
           last_ap = ap, ap = ap->next)
        {
          register struct argdata *arg = &args[ap->argno];
          int count_before = totlen;

          /* Add chars to XBUF.  */
          for (i = 0; i < ap->nchars; i++, offset++)
            xbuf[totlen++] = exp[offset];

          /* If followed by an empty rest arg with concatenation,
             delete the last run of nonwhite chars.  */
          if (rest_zero && totlen > count_before
              && ((ap->rest_args && ap->raw_before)
                  || (last_ap != NULL && last_ap->rest_args
                      && last_ap->raw_after)))
            {
              /* Delete final whitespace.  */
              while (totlen > count_before && is_space[xbuf[totlen - 1]])
                totlen--;

              /* Delete the nonwhites before them.  */
              while (totlen > count_before && ! is_space[xbuf[totlen - 1]])
                totlen--;
            }

          if (ap->stringify != 0)
            {
              bcopy (ARG_BASE + arg->stringified,
                     xbuf + totlen, arg->stringified_length);
              totlen += arg->stringified_length;
            }
          else if (ap->raw_before || ap->raw_after || CPP_TRADITIONAL (pfile))
            {
              U_CHAR *p1 = ARG_BASE + arg->raw;
              U_CHAR *l1 = p1 + arg->raw_length;
              if (ap->raw_before)
                {
                  while (p1 != l1 && is_space[*p1]) p1++;
                  while (p1 != l1 && is_idchar[*p1])
                    xbuf[totlen++] = *p1++;
                  /* Delete any no-reexpansion marker that follows
                     an identifier at the beginning of the argument
                     if the argument is concatenated with what precedes it.  */
                  if (p1[0] == '@' && p1[1] == '-')
                    p1 += 2;
                }
              if (ap->raw_after)
                {
                  /* Arg is concatenated after: delete trailing whitespace,
                     whitespace markers, and no-reexpansion markers.  */
                  while (p1 != l1)
                    {
                      if (is_space[l1[-1]]) l1--;
                      else if (l1[-1] == '-')
                        {
                          U_CHAR *p2 = l1 - 1;
                          /* If a `-' is preceded by an odd number of newlines then it
                             and the last newline are a no-reexpansion marker.  */
                          while (p2 != p1 && p2[-1] == '\n') p2--;
                          if ((l1 - 1 - p2) & 1) {
                            l1 -= 2;
                          }
                          else break;
                        }
                      else break;
                    }
                }

              bcopy (p1, xbuf + totlen, l1 - p1);
              totlen += l1 - p1;
            }
          else
            {
              U_CHAR *expanded = ARG_BASE + arg->expanded;
              if (!ap->raw_before && totlen > 0 && arg->expand_length
                  && !CPP_TRADITIONAL(pfile)
                  && unsafe_chars (xbuf[totlen-1], expanded[0]))
                {
                  xbuf[totlen++] = '@';
                  xbuf[totlen++] = ' ';
                }

              bcopy (expanded, xbuf + totlen, arg->expand_length);
              totlen += arg->expand_length;

              if (!ap->raw_after && totlen > 0 && offset < defn->length
                  && !CPP_TRADITIONAL(pfile)
                  && unsafe_chars (xbuf[totlen-1], exp[offset]))
                {
                  xbuf[totlen++] = '@';
                  xbuf[totlen++] = ' ';
                }

              /* If a macro argument with newlines is used multiple times,
                 then only expand the newlines once.  This avoids creating
                 output lines which don't correspond to any input line,
                 which confuses gdb and gcov.  */
              if (arg->use_count > 1 && arg->newlines > 0)
                {
                  /* Don't bother doing change_newlines for subsequent
                     uses of arg.  */
                  arg->use_count = 1;
                  arg->expand_length
                    = change_newlines (expanded, arg->expand_length);
                }
            }

          if (totlen > xbuf_len)
            abort ();
      }

      /* if there is anything left of the definition
         after handling the arg list, copy that in too.  */

      for (i = offset; i < defn->length; i++)
        {
          /* if we've reached the end of the macro */
          if (exp[i] == ')')
            rest_zero = 0;
          if (! (rest_zero && last_ap != NULL && last_ap->rest_args
                 && last_ap->raw_after))
            xbuf[totlen++] = exp[i];
        }

      xbuf[totlen] = 0;
      xbuf_len = totlen;

    }

  pfile->output_escapes--;

  /* Now put the expansion on the input stack
     so our caller will commence reading from it.  */
  push_macro_expansion (pfile, xbuf, xbuf_len, hp);
  CPP_BUFFER (pfile)->has_escapes = 1;

  /* Pop the space we've used in the token_buffer for argument expansion.  */
  CPP_SET_WRITTEN (pfile, old_written);
    
  /* Recursive macro use sometimes works traditionally.
     #define foo(x,y) bar (x (y,0), y)
     foo (foo, baz)  */
  
  if (!CPP_TRADITIONAL (pfile))
    hp->type = T_DISABLED;
}

static void
push_macro_expansion (pfile, xbuf, xbuf_len, hp)
     cpp_reader *pfile;
     register U_CHAR *xbuf;
     int xbuf_len;
     HASHNODE *hp;
{
  register cpp_buffer *mbuf = cpp_push_buffer (pfile, xbuf, xbuf_len);
  if (mbuf == NULL)
    return;
  mbuf->cleanup = macro_cleanup;
  mbuf->data = hp;

  /* The first chars of the expansion should be a "@ " added by
     collect_expansion.  This is to prevent accidental token-pasting
     between the text preceding the macro invocation, and the macro
     expansion text.

     We would like to avoid adding unneeded spaces (for the sake of
     tools that use cpp, such as imake).  In some common cases we can
     tell that it is safe to omit the space.

     The character before the macro invocation cannot have been an
     idchar (or else it would have been pasted with the idchars of
     the macro name).  Therefore, if the first non-space character
     of the expansion is an idchar, we do not need the extra space
     to prevent token pasting.

     Also, we don't need the extra space if the first char is '(',
     or some other (less common) characters.  */

  if (xbuf[0] == '@' && xbuf[1] == ' '
      && (is_idchar[xbuf[2]] || xbuf[2] == '(' || xbuf[2] == '\''
          || xbuf[2] == '\"'))
    mbuf->cur += 2;
}
\f
/* Like cpp_get_token, except that it does not read past end-of-line.
   Also, horizontal space is skipped, and macros are popped.  */

static enum cpp_token
get_directive_token (pfile)
     cpp_reader *pfile;
{
  for (;;)
    {
      long old_written = CPP_WRITTEN (pfile);
      enum cpp_token token;
      cpp_skip_hspace (pfile);
      if (PEEKC () == '\n')
          return CPP_VSPACE;
      token = cpp_get_token (pfile);
      switch (token)
      {
      case CPP_POP:
          if (! CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
              return token;
          /* ... else fall though ...  */
      case CPP_HSPACE:  case CPP_COMMENT:
          CPP_SET_WRITTEN (pfile, old_written);
          break;
      default:
          return token;
      }
    }
}
\f
/* Handle #include and #import.
   This function expects to see "fname" or <fname> on the input.

   The input is normally in part of the output_buffer following
   CPP_WRITTEN, and will get overwritten by output_line_command.
   I.e. in input file specification has been popped by handle_directive.
   This is safe.  */

static int
do_include (pfile, keyword, unused1, unused2)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *unused1, *unused2;
{
  int importing = (keyword->type == T_IMPORT);
  int skip_dirs = (keyword->type == T_INCLUDE_NEXT);
  char *fname;          /* Dynamically allocated fname buffer */
  char *pcftry;
  U_CHAR *fbeg, *fend;          /* Beginning and end of fname */
  enum cpp_token token;

  /* Chain of dirs to search */
  struct file_name_list *search_start = CPP_OPTIONS (pfile)->include;
  struct file_name_list dsp[1]; /* First in chain, if #include "..." */
  struct file_name_list *searchptr = 0;
  long old_written = CPP_WRITTEN (pfile);

  int flen;

  int f;                        /* file number */

  int angle_brackets = 0;       /* 0 for "...", 1 for <...> */
  char *pcfbuf;
#if 0
  int pcf = -1;
  char *pcfbuflimit;
#endif
  int pcfnum;
  f= -1;                        /* JF we iz paranoid! */

  if (CPP_PEDANTIC (pfile) && !CPP_BUFFER (pfile)->system_header_p)
    {
      if (importing)
        cpp_pedwarn (pfile, "ANSI C does not allow `#import'");
      if (skip_dirs)
        cpp_pedwarn (pfile, "ANSI C does not allow `#include_next'");
    }

  if (importing && CPP_OPTIONS (pfile)->warn_import
      && !CPP_OPTIONS (pfile)->inhibit_warnings
      && !CPP_BUFFER (pfile)->system_header_p && !pfile->import_warning)
    {
      pfile->import_warning = 1;
      cpp_warning (pfile, "using `#import' is not recommended");
      fprintf (stderr, "The fact that a certain header file need not be processed more than once\n");
      fprintf (stderr, "should be indicated in the header file, not where it is used.\n");
      fprintf (stderr, "The best way to do this is with a conditional of this form:\n\n");
      fprintf (stderr, "  #ifndef _FOO_H_INCLUDED\n");
      fprintf (stderr, "  #define _FOO_H_INCLUDED\n");
      fprintf (stderr, "  ... <real contents of file> ...\n");
      fprintf (stderr, "  #endif /* Not _FOO_H_INCLUDED */\n\n");
      fprintf (stderr, "Then users can use `#include' any number of times.\n");
      fprintf (stderr, "GNU C automatically avoids processing the file more than once\n");
      fprintf (stderr, "when it is equipped with such a conditional.\n");
    }

  pfile->parsing_include_directive++;
  token = get_directive_token (pfile);
  pfile->parsing_include_directive--;

  if (token == CPP_STRING)
    {
      /* FIXME - check no trailing garbage */
      fbeg = pfile->token_buffer + old_written + 1;
      fend = CPP_PWRITTEN (pfile) - 1;
      if (fbeg[-1] == '<')
        {
          angle_brackets = 1;
          /* If -I-, start with the first -I dir after the -I-.  */
          if (CPP_OPTIONS (pfile)->first_bracket_include)
            search_start = CPP_OPTIONS (pfile)->first_bracket_include;
        }
      /* If -I- was specified, don't search current dir, only spec'd ones.  */
      else if (! CPP_OPTIONS (pfile)->ignore_srcdir)
        {
          cpp_buffer *fp = CPP_BUFFER (pfile);
          /* We have "filename".  Figure out directory this source
             file is coming from and put it on the front of the list.  */

          for ( ; fp != CPP_NULL_BUFFER (pfile); fp = CPP_PREV_BUFFER (fp))
            {
              int n;
              char *ep,*nam;

              if ((nam = fp->nominal_fname) != NULL)
                {
                  /* Found a named file.  Figure out dir of the file,
                     and put it in front of the search list.  */
                  dsp[0].next = search_start;
                  search_start = dsp;
#ifndef VMS
                  ep = rindex (nam, '/');
#else                           /* VMS */
                  ep = rindex (nam, ']');
                  if (ep == NULL) ep = rindex (nam, '>');
                  if (ep == NULL) ep = rindex (nam, ':');
                  if (ep != NULL) ep++;
#endif                          /* VMS */
                  if (ep != NULL)
                    {
                      n = ep - nam;
                      dsp[0].fname = (char *) alloca (n + 1);
                      strncpy (dsp[0].fname, nam, n);
                      dsp[0].fname[n] = '\0';
                      if (n + INCLUDE_LEN_FUDGE > pfile->max_include_len)
                        pfile->max_include_len = n + INCLUDE_LEN_FUDGE;
                    }
                  else
                    {
                      dsp[0].fname = 0; /* Current directory */
                    }
                  dsp[0].got_name_map = 0;
                  break;
                }
            }
        }
    }
#ifdef VMS
  else if (token == CPP_NAME)
    {
      /*
       * Support '#include xyz' like VAX-C to allow for easy use of all the
       * decwindow include files. It defaults to '#include <xyz.h>' (so the
       * code from case '<' is repeated here) and generates a warning.
       */
      cpp_warning (pfile,
                   "VAX-C-style include specification found, use '#include <filename.h>' !");
      angle_brackets = 1;
      /* If -I-, start with the first -I dir after the -I-.  */
      if (CPP_OPTIONS (pfile)->first_bracket_include)
        search_start = CPP_OPTIONS (pfile)->first_bracket_include;
      fbeg = pfile->token_buffer + old_written;
      fend = CPP_PWRITTEN (pfile);
    }
#endif
  else
    {
      cpp_error (pfile,
                 "`#%s' expects \"FILENAME\" or <FILENAME>", keyword->name);
      CPP_SET_WRITTEN (pfile, old_written);
      skip_rest_of_line (pfile);
      return 0;
    }

  *fend = 0;

  token = get_directive_token (pfile);
  if (token != CPP_VSPACE)
    {
      cpp_error (pfile, "junk at end of `#include'");
      while (token != CPP_VSPACE && token != CPP_EOF && token != CPP_POP)
        token = get_directive_token (pfile);
    }

  /* For #include_next, skip in the search path
     past the dir in which the containing file was found.  */
  if (skip_dirs)
    {
      cpp_buffer *fp = CPP_BUFFER (pfile);
      for (; fp != CPP_NULL_BUFFER (pfile); fp = CPP_PREV_BUFFER (fp))
        if (fp->fname != NULL)
          {
            /* fp->dir is null if the containing file was specified with
               an absolute file name.  In that case, don't skip anything.  */
            if (fp->dir == SELF_DIR_DUMMY)
              search_start = CPP_OPTIONS (pfile)->include;
            else if (fp->dir)
              search_start = fp->dir->next;
            break;
          }
    }

  CPP_SET_WRITTEN (pfile, old_written);

  flen = fend - fbeg;

  if (flen == 0)
    {
      cpp_error (pfile, "empty file name in `#%s'", keyword->name);
      return 0;
    }

  /* Allocate this permanently, because it gets stored in the definitions
     of macros.  */
  fname = (char *) xmalloc (pfile->max_include_len + flen + 4);
  /* + 2 above for slash and terminating null.  */
  /* + 2 added for '.h' on VMS (to support '#include filename') */

  /* If specified file name is absolute, just open it.  */

  if (*fbeg == '/') {
    strncpy (fname, fbeg, flen);
    fname[flen] = 0;
    if (redundant_include_p (pfile, fname))
      return 0;
    if (importing)
      f = lookup_import (pfile, fname, NULL_PTR);
    else
      f = open_include_file (pfile, fname, NULL_PTR);
    if (f == -2)
      return 0;         /* Already included this file */
  } else {
    /* Search directory path, trying to open the file.
       Copy each filename tried into FNAME.  */

    for (searchptr = search_start; searchptr; searchptr = searchptr->next) {
      if (searchptr->fname) {
        /* The empty string in a search path is ignored.
           This makes it possible to turn off entirely
           a standard piece of the list.  */
        if (searchptr->fname[0] == 0)
          continue;
        strcpy (fname, searchptr->fname);
        strcat (fname, "/");
        fname[strlen (fname) + flen] = 0;
      } else {
        fname[0] = 0;
      }
      strncat (fname, fbeg, flen);
#ifdef VMS
      /* Change this 1/2 Unix 1/2 VMS file specification into a
         full VMS file specification */
      if (searchptr->fname && (searchptr->fname[0] != 0)) {
        /* Fix up the filename */
        hack_vms_include_specification (fname);
      } else {
        /* This is a normal VMS filespec, so use it unchanged.  */
        strncpy (fname, fbeg, flen);
        fname[flen] = 0;
        /* if it's '#include filename', add the missing .h */
        if (index(fname,'.')==NULL) {
          strcat (fname, ".h");
        }
      }
#endif /* VMS */
      /* ??? There are currently 3 separate mechanisms for avoiding processing
         of redundant include files: #import, #pragma once, and
         redundant_include_p.  It would be nice if they were unified.  */
      if (redundant_include_p (pfile, fname))
        return 0;
      if (importing)
        f = lookup_import (pfile, fname, searchptr);
      else
        f = open_include_file (pfile, fname, searchptr);
      if (f == -2)
        return 0;                       /* Already included this file */
#ifdef EACCES
      else if (f == -1 && errno == EACCES)
        cpp_warning (pfile, "Header file %s exists, but is not readable",
                     fname);
#endif
      if (f >= 0)
        break;
    }
  }

  if (f < 0)
    {
      /* A file that was not found.  */
      strncpy (fname, fbeg, flen);
      fname[flen] = 0;
      /* If generating dependencies and -MG was specified, we assume missing
         files are leaf files, living in the same directory as the source file
         or other similar place; these missing files may be generated from
         other files and may not exist yet (eg: y.tab.h).  */

      if (CPP_OPTIONS(pfile)->print_deps_missing_files
          && CPP_PRINT_DEPS (pfile)
          > (angle_brackets || (pfile->system_include_depth > 0)))
        {
          /* If it was requested as a system header file,
             then assume it belongs in the first place to look for such.  */
          if (angle_brackets)
            {
              for (searchptr = search_start; searchptr;
                   searchptr = searchptr->next)
                {
                  if (searchptr->fname)
                    {
                      char *p;

                      if (searchptr->fname[0] == 0)
                        continue;
                      p = (char *) alloca (strlen (searchptr->fname)
                                           + strlen (fname) + 2);
                      strcpy (p, searchptr->fname);
                      strcat (p, "/");
                      strcat (p, fname);
                      deps_output (pfile, p, ' ');
                      break;
                    }
                }
            }
          else
            {
              /* Otherwise, omit the directory, as if the file existed
                 in the directory with the source.  */
              deps_output (pfile, fname, ' ');
            }
        }
      /* If -M was specified, and this header file won't be added to the
         dependency list, then don't count this as an error, because we can
         still produce correct output.  Otherwise, we can't produce correct
         output, because there may be dependencies we need inside the missing
         file, and we don't know what directory this missing file exists in.*/
      else if (CPP_PRINT_DEPS (pfile)
               && (CPP_PRINT_DEPS (pfile)
                   <= (angle_brackets || (pfile->system_include_depth > 0))))
        cpp_warning (pfile, "No include path in which to find %s", fname);
      else if (search_start)
        cpp_error_from_errno (pfile, fname);
      else
        cpp_error (pfile, "No include path in which to find %s", fname);
    }
  else {
    /* Check to see if this include file is a once-only include file.
       If so, give up.  */

    struct file_name_list *ptr;

    for (ptr = pfile->dont_repeat_files; ptr; ptr = ptr->next) {
      if (!strcmp (ptr->fname, fname)) {
        close (f);
        return 0;                               /* This file was once'd.  */
      }
    }

    for (ptr = pfile->all_include_files; ptr; ptr = ptr->next) {
      if (!strcmp (ptr->fname, fname))
        break;                          /* This file was included before.  */
    }

    if (ptr == 0) {
      /* This is the first time for this file.  */
      /* Add it to list of files included.  */

      ptr = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
      ptr->control_macro = 0;
      ptr->c_system_include_path = 0;
      ptr->next = pfile->all_include_files;
      pfile->all_include_files = ptr;
      ptr->fname = savestring (fname);
      ptr->got_name_map = 0;

      /* For -M, add this file to the dependencies.  */
      if (CPP_PRINT_DEPS (pfile)
          > (angle_brackets || (pfile->system_include_depth > 0)))
        deps_output (pfile, fname, ' ');
    }   

    /* Handle -H option.  */
    if (CPP_OPTIONS(pfile)->print_include_names)
      {
        cpp_buffer *buf = CPP_BUFFER (pfile);
        while ((buf = CPP_PREV_BUFFER (buf)) != CPP_NULL_BUFFER (pfile))
          putc ('.', stderr);
        fprintf (stderr, "%s\n", fname);
      }

    if (angle_brackets)
      pfile->system_include_depth++;

    /* Actually process the file.  */

    /* Record file on "seen" list for #import.  */
    add_import (pfile, f, fname);

    pcftry = (char *) alloca (strlen (fname) + 30);
    pcfbuf = 0;
    pcfnum = 0;

#if 0
    if (!no_precomp)
      {
        struct stat stat_f;

        fstat (f, &stat_f);

        do {
          sprintf (pcftry, "%s%d", fname, pcfnum++);

          pcf = open (pcftry, O_RDONLY, 0666);
          if (pcf != -1)
            {
              struct stat s;

              fstat (pcf, &s);
              if (bcmp ((char *) &stat_f.st_ino, (char *) &s.st_ino,
                        sizeof (s.st_ino))
                  || stat_f.st_dev != s.st_dev)
                {
                  pcfbuf = check_precompiled (pcf, fname, &pcfbuflimit);
                  /* Don't need it any more.  */
                  close (pcf);
                }
              else
                {
                  /* Don't need it at all.  */
                  close (pcf);
                  break;
                }
            }
        } while (pcf != -1 && !pcfbuf);
      }
#endif
    
    /* Actually process the file */
    if (cpp_push_buffer (pfile, NULL, 0) == NULL)
      return 0;
    if (finclude (pfile, f, fname, is_system_include (pfile, fname),
                  searchptr != dsp ? searchptr : SELF_DIR_DUMMY))
      {
        output_line_command (pfile, 0, enter_file);
        pfile->only_seen_white = 2;
      }

    if (angle_brackets)
      pfile->system_include_depth--;
  }
  return 0;
}

/* Return nonzero if there is no need to include file NAME
   because it has already been included and it contains a conditional
   to make a repeated include do nothing.  */

static int
redundant_include_p (pfile, name)
     cpp_reader *pfile;
     char *name;
{
  struct file_name_list *l = pfile->all_include_files;
  for (; l; l = l->next)
    if (! strcmp (name, l->fname)
        && l->control_macro
        && cpp_lookup (pfile, l->control_macro, -1, -1))
      return 1;
  return 0;
}

/* Return nonzero if the given FILENAME is an absolute pathname which
   designates a file within one of the known "system" include file
   directories.  We assume here that if the given FILENAME looks like
   it is the name of a file which resides either directly in a "system"
   include file directory, or within any subdirectory thereof, then the
   given file must be a "system" include file.  This function tells us
   if we should suppress pedantic errors/warnings for the given FILENAME.

   The value is 2 if the file is a C-language system header file
   for which C++ should (on most systems) assume `extern "C"'.  */

static int
is_system_include (pfile, filename)
     cpp_reader *pfile;
     register char *filename;
{
  struct file_name_list *searchptr;

  for (searchptr = CPP_OPTIONS (pfile)->first_system_include; searchptr;
       searchptr = searchptr->next)
    if (searchptr->fname) {
      register char *sys_dir = searchptr->fname;
      register unsigned length = strlen (sys_dir);

      if (! strncmp (sys_dir, filename, length) && filename[length] == '/')
        {
          if (searchptr->c_system_include_path)
            return 2;
          else
            return 1;
        }
    }
  return 0;
}

\f
/*
 * Install a name in the assertion hash table.
 *
 * If LEN is >= 0, it is the length of the name.
 * Otherwise, compute the length by scanning the entire name.
 *
 * If HASH is >= 0, it is the precomputed hash code.
 * Otherwise, compute the hash code.
 */

static ASSERTION_HASHNODE *
assertion_install (pfile, name, len, hash)
     cpp_reader *pfile;
     U_CHAR *name;
     int len;
     int hash;
{
  register ASSERTION_HASHNODE *hp;
  register int i, bucket;
  register U_CHAR *p, *q;

  i = sizeof (ASSERTION_HASHNODE) + len + 1;
  hp = (ASSERTION_HASHNODE *) xmalloc (i);
  bucket = hash;
  hp->bucket_hdr = &pfile->assertion_hashtab[bucket];
  hp->next = pfile->assertion_hashtab[bucket];
  pfile->assertion_hashtab[bucket] = hp;
  hp->prev = NULL;
  if (hp->next != NULL)
    hp->next->prev = hp;
  hp->length = len;
  hp->value = 0;
  hp->name = ((U_CHAR *) hp) + sizeof (ASSERTION_HASHNODE);
  p = hp->name;
  q = name;
  for (i = 0; i < len; i++)
    *p++ = *q++;
  hp->name[len] = 0;
  return hp;
}
/*
 * find the most recent hash node for name name (ending with first
 * non-identifier char) installed by install
 *
 * If LEN is >= 0, it is the length of the name.
 * Otherwise, compute the length by scanning the entire name.
 *
 * If HASH is >= 0, it is the precomputed hash code.
 * Otherwise, compute the hash code.
 */

static ASSERTION_HASHNODE *
assertion_lookup (pfile, name, len, hash)
     cpp_reader *pfile;
     U_CHAR *name;
     int len;
     int hash;
{
  register ASSERTION_HASHNODE *bucket;

  bucket = pfile->assertion_hashtab[hash];
  while (bucket) {
    if (bucket->length == len && strncmp (bucket->name, name, len) == 0)
      return bucket;
    bucket = bucket->next;
  }
  return NULL;
}

static void
delete_assertion (hp)
     ASSERTION_HASHNODE *hp;
{
  struct tokenlist_list *tail;
  if (hp->prev != NULL)
    hp->prev->next = hp->next;
  if (hp->next != NULL)
    hp->next->prev = hp->prev;

  for (tail = hp->value; tail; )
    {
      struct tokenlist_list *next = tail->next;
      free_token_list (tail->tokens);
      free (tail);
      tail = next;
    }

  /* Make sure that the bucket chain header that
     the deleted guy was on points to the right thing afterwards.  */
  if (hp == *hp->bucket_hdr)
    *hp->bucket_hdr = hp->next;

  free (hp);
}
\f
/* Convert a character string literal into a nul-terminated string.
   The input string is [IN ... LIMIT).
   The result is placed in RESULT.  RESULT can be the same as IN.
   The value returned in the end of the string written to RESULT,
   or NULL on error.  */

static U_CHAR *
convert_string (pfile, result, in, limit, handle_escapes)
     cpp_reader *pfile;
     register U_CHAR *result, *in, *limit;
     int handle_escapes;
{
  U_CHAR c;
  c = *in++;
  if (c != '\"')
    return NULL;
  while (in < limit)
    {
      U_CHAR c = *in++;
      switch (c)
        {
        case '\0':
          return NULL;
        case '\"':
          limit = in;
          break;
        case '\\':
          if (handle_escapes)
            {
              char *bpc = (char *) in;
              int i = (U_CHAR) cpp_parse_escape (pfile, &bpc);
              in = (U_CHAR *) bpc;
              if (i >= 0)
                *result++ = (U_CHAR)c;
              break;
            }
          /* else fall through */
        default:
          *result++ = c;
        }
    }
  *result = 0;
  return result;
}

/*
 * interpret #line command.  Remembers previously seen fnames
 * in its very own hash table.
 */
#define FNAME_HASHSIZE 37

static int
do_line (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword;
{
  cpp_buffer *ip = CPP_BUFFER (pfile);
  int new_lineno;
  long old_written = CPP_WRITTEN (pfile);
  enum file_change_code file_change = same_file;
  enum cpp_token token;

  token = get_directive_token (pfile);

  if (token != CPP_NUMBER
      || !isdigit(pfile->token_buffer[old_written]))
    {
      cpp_error (pfile, "invalid format `#line' command");
      goto bad_line_directive;
    }

  /* The Newline at the end of this line remains to be processed.
     To put the next line at the specified line number,
     we must store a line number now that is one less.  */
  new_lineno = atoi ((char *)(pfile->token_buffer + old_written)) - 1;
  CPP_SET_WRITTEN (pfile, old_written);

  /* NEW_LINENO is one less than the actual line number here.  */
  if (CPP_PEDANTIC (pfile) && new_lineno < 0)
    cpp_pedwarn (pfile, "line number out of range in `#line' command");

#if 0 /* #line 10"foo.c" is supposed to be allowed.  */
  if (PEEKC() && !is_space[PEEKC()]) {
    cpp_error (pfile, "invalid format `#line' command");
    goto bad_line_directive;
  }
#endif

  token = get_directive_token (pfile);

  if (token == CPP_STRING) {
    U_CHAR *fname = pfile->token_buffer + old_written;
    U_CHAR *end_name;
    static HASHNODE *fname_table[FNAME_HASHSIZE];
    HASHNODE *hp, **hash_bucket;
    U_CHAR *p;
    long num_start;
    int fname_length;

    /* Turn the file name, which is a character string literal,
       into a null-terminated string.  Do this in place.  */
    end_name = convert_string (pfile, fname, fname, CPP_PWRITTEN (pfile), 1);
    if (end_name == NULL)
    {
        cpp_error (pfile, "invalid format `#line' command");
        goto bad_line_directive;
    }

    fname_length = end_name - fname;

    num_start = CPP_WRITTEN (pfile);
    token = get_directive_token (pfile);
    if (token != CPP_VSPACE && token != CPP_EOF && token != CPP_POP) {
      p = pfile->token_buffer + num_start;
      if (CPP_PEDANTIC (pfile))
        cpp_pedwarn (pfile, "garbage at end of `#line' command");

      if (token != CPP_NUMBER || *p < '0' || *p > '4' || p[1] != '\0')
      {
        cpp_error (pfile, "invalid format `#line' command");
        goto bad_line_directive;
      }
      if (*p == '1')
        file_change = enter_file;
      else if (*p == 2)
        file_change = leave_file;
      else if (*p == 3)
        ip->system_header_p = 1;
      else /* if (*p == 4) */
        ip->system_header_p = 2;

      CPP_SET_WRITTEN (pfile, num_start);
      token = get_directive_token (pfile);
      p = pfile->token_buffer + num_start;
      if (token == CPP_NUMBER && p[1] == '\0' && (*p == '3' || *p== '4')) {
        ip->system_header_p = *p == 3 ? 1 : 2;
        token = get_directive_token (pfile);
      }
      if (token != CPP_VSPACE) {
        cpp_error (pfile, "invalid format `#line' command");
        goto bad_line_directive;
      }
    }

    hash_bucket = &fname_table[hashf (fname, fname_length, FNAME_HASHSIZE)];
    for (hp = *hash_bucket; hp != NULL; hp = hp->next)
      if (hp->length == fname_length
          && strncmp (hp->value.cpval, fname, fname_length) == 0) {
        ip->nominal_fname = hp->value.cpval;
        break;
      }
    if (hp == 0) {
      /* Didn't find it; cons up a new one.  */
      hp = (HASHNODE *) xcalloc (1, sizeof (HASHNODE) + fname_length + 1);
      hp->next = *hash_bucket;
      *hash_bucket = hp;

      hp->length = fname_length;
      ip->nominal_fname = hp->value.cpval = ((char *) hp) + sizeof (HASHNODE);
      bcopy (fname, hp->value.cpval, fname_length);
    }
  }
  else if (token != CPP_VSPACE && token != CPP_EOF) {
    cpp_error (pfile, "invalid format `#line' command");
    goto bad_line_directive;
  }

  ip->lineno = new_lineno;
 bad_line_directive:
  skip_rest_of_line (pfile);
  CPP_SET_WRITTEN (pfile, old_written);
  output_line_command (pfile, 0, file_change);
  return 0;
}

/*
 * remove the definition of a symbol from the symbol table.
 * according to un*x /lib/cpp, it is not an error to undef
 * something that has no definitions, so it isn't one here either.
 */

static int
do_undef (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  int sym_length;
  HASHNODE *hp;
  U_CHAR *orig_buf = buf;

#if 0
  /* If this is a precompiler run (with -pcp) pass thru #undef commands.  */
  if (pcp_outfile && keyword)
    pass_thru_directive (buf, limit, pfile, keyword);
#endif

  SKIP_WHITE_SPACE (buf);
  sym_length = check_macro_name (pfile, buf, "macro");

  while ((hp = cpp_lookup (pfile, buf, sym_length, -1)) != NULL)
    {
      /* If we are generating additional info for debugging (with -g) we
         need to pass through all effective #undef commands.  */
      if (CPP_OPTIONS (pfile)->debug_output && keyword)
        pass_thru_directive (orig_buf, limit, pfile, keyword);
      if (hp->type != T_MACRO)
        cpp_warning (pfile, "undefining `%s'", hp->name);
      delete_macro (hp);
    }

  if (CPP_PEDANTIC (pfile)) {
    buf += sym_length;
    SKIP_WHITE_SPACE (buf);
    if (buf != limit)
      cpp_pedwarn (pfile, "garbage after `#undef' directive");
  }
  return 0;
}
\f
/*
 * Report an error detected by the program we are processing.
 * Use the text of the line in the error message.
 * (We use error because it prints the filename & line#.)
 */

static int
do_error (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  int length = limit - buf;
  U_CHAR *copy = (U_CHAR *) alloca (length + 1);
  bcopy (buf, copy, length);
  copy[length] = 0;
  SKIP_WHITE_SPACE (copy);
  cpp_error (pfile, "#error %s", copy);
  return 0;
}

/*
 * Report a warning detected by the program we are processing.
 * Use the text of the line in the warning message, then continue.
 * (We use error because it prints the filename & line#.)
 */

static int
do_warning (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  int length = limit - buf;
  U_CHAR *copy = (U_CHAR *) alloca (length + 1);
  bcopy (buf, copy, length);
  copy[length] = 0;
  SKIP_WHITE_SPACE (copy);
  /* Use `pedwarn' not `warning', because #warning isn't in the C Standard;
     if -pedantic-errors is given, #warning should cause an error.  */
  cpp_pedwarn (pfile, "#warning %s", copy);
  return 0;
}

/* Remember the name of the current file being read from so that we can
   avoid ever including it again.  */

static int
do_once (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *ip = NULL;
  struct file_name_list *new;

  for (ip = CPP_BUFFER (pfile); ; ip = CPP_PREV_BUFFER (ip))
    {
      if (ip == CPP_NULL_BUFFER (pfile))
        return 0;
      if (ip->fname != NULL)
        break;
    }

    
  new = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
  new->next = pfile->dont_repeat_files;
  pfile->dont_repeat_files = new;
  new->fname = savestring (ip->fname);
  new->control_macro = 0;
  new->got_name_map = 0;
  new->c_system_include_path = 0;

  return 0;
}

/* Report program identification.  */

static int
do_ident (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
/*  long old_written = CPP_WRITTEN (pfile);*/

  /* Allow #ident in system headers, since that's not user's fault.  */
  if (CPP_PEDANTIC (pfile) && !CPP_BUFFER (pfile)->system_header_p)
    cpp_pedwarn (pfile, "ANSI C does not allow `#ident'");

  /* Leave rest of line to be read by later calls to cpp_get_token.  */

  return 0;
}

/* #pragma and its argument line have already been copied to the output file.
   Just check for some recognized pragmas that need validation here.  */

static int
do_pragma (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  while (*buf == ' ' || *buf == '\t')
    buf++;
  if (!strncmp (buf, "once", 4)) {
    /* Allow #pragma once in system headers, since that's not the user's
       fault.  */
    if (!CPP_BUFFER (pfile)->system_header_p)
      cpp_warning (pfile, "`#pragma once' is obsolete");
    do_once (pfile);
  }

  if (!strncmp (buf, "implementation", 14)) {
    /* Be quiet about `#pragma implementation' for a file only if it hasn't
       been included yet.  */
    struct file_name_list *ptr;
    U_CHAR *p = buf + 14, *fname, *inc_fname;
    int fname_len;
    SKIP_WHITE_SPACE (p);
    if (*p == '\n' || *p != '\"')
      return 0;

    fname = p + 1;
    p = (U_CHAR *) index (fname, '\"');
    fname_len = p != NULL ? p - fname : strlen (fname);
    
    for (ptr = pfile->all_include_files; ptr; ptr = ptr->next) {
      inc_fname = (U_CHAR *) rindex (ptr->fname, '/');
      inc_fname = inc_fname ? inc_fname + 1 : (U_CHAR *) ptr->fname;
      if (inc_fname && !strncmp (inc_fname, fname, fname_len))
        cpp_warning (pfile,
           "`#pragma implementation' for `%s' appears after file is included",
                     fname);
    }
  }

  return 0;
}

#if 0
/* This was a fun hack, but #pragma seems to start to be useful.
   By failing to recognize it, we pass it through unchanged to cc1.  */

/*
 * the behavior of the #pragma directive is implementation defined.
 * this implementation defines it as follows.
 */

static int
do_pragma ()
{
  close (0);
  if (open ("/dev/tty", O_RDONLY, 0666) != 0)
    goto nope;
  close (1);
  if (open ("/dev/tty", O_WRONLY, 0666) != 1)
    goto nope;
  execl ("/usr/games/hack", "#pragma", 0);
  execl ("/usr/games/rogue", "#pragma", 0);
  execl ("/usr/new/emacs", "-f", "hanoi", "9", "-kill", 0);
  execl ("/usr/local/emacs", "-f", "hanoi", "9", "-kill", 0);
nope:
  fatal ("You are in a maze of twisty compiler features, all different");
}
#endif

/* Just ignore #sccs, on systems where we define it at all.  */

static int
do_sccs (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  if (CPP_PEDANTIC (pfile))
    cpp_pedwarn (pfile, "ANSI C does not allow `#sccs'");
  return 0;
}
\f
/*
 * handle #if command by
 *   1) inserting special `defined' keyword into the hash table
 *      that gets turned into 0 or 1 by special_symbol (thus,
 *      if the luser has a symbol called `defined' already, it won't
 *      work inside the #if command)
 *   2) rescan the input into a temporary output buffer
 *   3) pass the output buffer to the yacc parser and collect a value
 *   4) clean up the mess left from steps 1 and 2.
 *   5) call conditional_skip to skip til the next #endif (etc.),
 *      or not, depending on the value from step 3.
 */

static int
do_if (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  HOST_WIDE_INT value = eval_if_expression (pfile, buf, limit - buf);
  conditional_skip (pfile, value == 0, T_IF, NULL_PTR);
  return 0;
}

/*
 * handle a #elif directive by not changing  if_stack  either.
 * see the comment above do_else.
 */

static int
do_elif (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack) {
    cpp_error (pfile, "`#elif' not within a conditional");
    return 0;
  } else {
    if (pfile->if_stack->type != T_IF && pfile->if_stack->type != T_ELIF) {
      cpp_error (pfile, "`#elif' after `#else'");
#if 0
      fprintf (stderr, " (matches line %d", pfile->if_stack->lineno);
#endif
      if (pfile->if_stack->fname != NULL && CPP_BUFFER (pfile)->fname != NULL
          && strcmp (pfile->if_stack->fname,
                     CPP_BUFFER (pfile)->nominal_fname) != 0)
        fprintf (stderr, ", file %s", pfile->if_stack->fname);
      fprintf (stderr, ")\n");
    }
    pfile->if_stack->type = T_ELIF;
  }

  if (pfile->if_stack->if_succeeded)
    skip_if_group (pfile, 0);
  else {
    HOST_WIDE_INT value = eval_if_expression (pfile, buf, limit - buf);
    if (value == 0)
      skip_if_group (pfile, 0);
    else {
      ++pfile->if_stack->if_succeeded;  /* continue processing input */
      output_line_command (pfile, 1, same_file);
    }
  }
  return 0;
}

/*
 * evaluate a #if expression in BUF, of length LENGTH,
 * then parse the result as a C expression and return the value as an int.
 */

static HOST_WIDE_INT
eval_if_expression (pfile, buf, length)
     cpp_reader *pfile;
     U_CHAR *buf;
     int length;
{
  HASHNODE *save_defined;
  HOST_WIDE_INT value;
  long old_written = CPP_WRITTEN (pfile);

  save_defined = install ((U_CHAR *)"defined", -1, T_SPEC_DEFINED, 0, 0, -1);
  pfile->pcp_inside_if = 1;

  value = cpp_parse_expr (pfile);
  pfile->pcp_inside_if = 0;
  delete_macro (save_defined);  /* clean up special symbol */

  CPP_SET_WRITTEN (pfile, old_written); /* Pop */

  return value;
}

/*
 * routine to handle ifdef/ifndef.  Try to look up the symbol,
 * then do or don't skip to the #endif/#else/#elif depending
 * on what directive is actually being processed.
 */

static int
do_xifdef (pfile, keyword, unused1, unused2)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *unused1, *unused2;
{
  int skip;
  cpp_buffer *ip = CPP_BUFFER (pfile);
  U_CHAR *ident;
  int ident_length;
  enum cpp_token token;
  int start_of_file = 0;
  U_CHAR *control_macro = 0;
  int old_written = CPP_WRITTEN (pfile);

  /* Detect a #ifndef at start of file (not counting comments).  */
  if (ip->fname != 0 && keyword->type == T_IFNDEF)
    start_of_file = pfile->only_seen_white == 2;

  pfile->no_macro_expand++;
  token = get_directive_token (pfile);
  pfile->no_macro_expand--;

  ident = pfile->token_buffer + old_written;
  ident_length = CPP_WRITTEN (pfile) - old_written;
  CPP_SET_WRITTEN (pfile, old_written); /* Pop */

  if (token == CPP_VSPACE || token == CPP_POP || token == CPP_EOF)
    {
      skip = (keyword->type == T_IFDEF);
      if (! CPP_TRADITIONAL (pfile))
        cpp_pedwarn (pfile, "`#%s' with no argument", keyword->name);
    }
  else if (token == CPP_NAME)
    {
      HASHNODE *hp = cpp_lookup (pfile, ident, ident_length, -1);
      skip = (hp == NULL) ^ (keyword->type == T_IFNDEF);
      if (start_of_file && !skip)
        {
          control_macro = (U_CHAR *) xmalloc (ident_length + 1);
          bcopy (ident, control_macro, ident_length + 1);
        }
    }
  else
    {
      skip = (keyword->type == T_IFDEF);
      if (! CPP_TRADITIONAL (pfile))
        cpp_error (pfile, "`#%s' with invalid argument", keyword->name);
    }

  if (!CPP_TRADITIONAL (pfile))
    { int c;
      cpp_skip_hspace (pfile);
      c = PEEKC ();
      if (c != EOF && c != '\n')
        cpp_pedwarn (pfile, "garbage at end of `#%s' argument", keyword->name);
    }
  skip_rest_of_line (pfile);

#if 0
    if (pcp_outfile) {
      /* Output a precondition for this macro.  */
      if (hp && hp->value.defn->predefined)
        fprintf (pcp_outfile, "#define %s\n", hp->name);
      else {
        U_CHAR *cp = buf;
        fprintf (pcp_outfile, "#undef ");
        while (is_idchar[*cp]) /* Ick! */
          fputc (*cp++, pcp_outfile);
        putc ('\n', pcp_outfile);
      }
#endif

  conditional_skip (pfile, skip, T_IF, control_macro);
  return 0;
}

/* Push TYPE on stack; then, if SKIP is nonzero, skip ahead.
   If this is a #ifndef starting at the beginning of a file,
   CONTROL_MACRO is the macro name tested by the #ifndef.
   Otherwise, CONTROL_MACRO is 0.  */

static void
conditional_skip (pfile, skip, type, control_macro)
     cpp_reader *pfile;
     int skip;
     enum node_type type;
     U_CHAR *control_macro;
{
  IF_STACK_FRAME *temp;

  temp = (IF_STACK_FRAME *) xcalloc (1, sizeof (IF_STACK_FRAME));
  temp->fname = CPP_BUFFER (pfile)->nominal_fname;
#if 0
  temp->lineno = CPP_BUFFER (pfile)->lineno;
#endif
  temp->next = pfile->if_stack;
  temp->control_macro = control_macro;
  pfile->if_stack = temp;

  pfile->if_stack->type = type;

  if (skip != 0) {
    skip_if_group (pfile, 0);
    return;
  } else {
    ++pfile->if_stack->if_succeeded;
    output_line_command (pfile, 1, same_file);
  }
}

/*
 * skip to #endif, #else, or #elif.  adjust line numbers, etc.
 * leaves input ptr at the sharp sign found.
 * If ANY is nonzero, return at next directive of any sort.
 */

static void
skip_if_group (pfile, any)
     cpp_reader *pfile;
     int any;
{
  int c;
  struct directive *kt;
  IF_STACK_FRAME *save_if_stack = pfile->if_stack; /* don't pop past here */
#if 0
  U_CHAR *beg_of_line = bp;
#endif
  register int ident_length;
  U_CHAR *ident;
  struct parse_marker line_start_mark;

  parse_set_mark (&line_start_mark, pfile);

  if (CPP_OPTIONS (pfile)->output_conditionals) {
    static char failed[] = "#failed\n";
    CPP_PUTS (pfile, failed, sizeof(failed)-1);
    pfile->lineno++;
    output_line_command (pfile, 1, same_file);
  }

 beg_of_line:
  if (CPP_OPTIONS (pfile)->output_conditionals)
    {
      cpp_buffer *pbuf = CPP_BUFFER (pfile);
      U_CHAR *start_line = pbuf->buf + line_start_mark.position;
      CPP_PUTS (pfile, start_line, pbuf->cur - start_line);
    }
  parse_move_mark (&line_start_mark, pfile);
  if (!CPP_TRADITIONAL (pfile))
      cpp_skip_hspace (pfile);
  c  = GETC();
  if (c == '#')
    {
      int old_written = CPP_WRITTEN (pfile);
      cpp_skip_hspace (pfile);

      parse_name (pfile, GETC());
      ident_length = CPP_WRITTEN (pfile) - old_written;
      ident = pfile->token_buffer + old_written;
      pfile->limit = ident;
#if 0
      if (ident_length == 0)
        goto not_a_directive;

      /* Handle # followed by a line number.  */

      /* Avoid error for `###' and similar cases unless -pedantic.  */
#endif

      for (kt = directive_table; kt->length >= 0; kt++)
        {
          IF_STACK_FRAME *temp;
          if (ident_length == kt->length
              && strncmp (ident, kt->name, kt->length) == 0)
            {
              /* If we are asked to return on next directive, do so now.  */
              if (any)
                goto done;

              switch (kt->type)
                {
                case T_IF:
                case T_IFDEF:
                case T_IFNDEF:
                  temp
                    = (IF_STACK_FRAME *) xcalloc (1, sizeof (IF_STACK_FRAME));
                  temp->next = pfile->if_stack;
                  pfile->if_stack = temp;
#if 0
                  temp->lineno = CPP_BUFFER(pfile)->lineno;
#endif
                  temp->fname = CPP_BUFFER(pfile)->nominal_fname;
                  temp->type = kt->type;
                  break;
                case T_ELSE:
                case T_ENDIF:
                  if (CPP_PEDANTIC (pfile) && pfile->if_stack != save_if_stack)
                    validate_else (pfile,
                                   kt->type == T_ELSE ? "#else" : "#endif");
                case T_ELIF:
                  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack)
                    {
                      cpp_error (pfile,
                                 "`#%s' not within a conditional", kt->name);
                      break;
                    }
                  else if (pfile->if_stack == save_if_stack)
                    goto done;          /* found what we came for */

                  if (kt->type != T_ENDIF)
                    {
                      if (pfile->if_stack->type == T_ELSE)
                        cpp_error (pfile, "`#else' or `#elif' after `#else'");
                      pfile->if_stack->type = kt->type;
                      break;
                    }

                  temp = pfile->if_stack;
                  pfile->if_stack = temp->next;
                  free (temp);
                  break;
              default: ;
                }
              break;
            }
          /* Don't let erroneous code go by.  */
          if (kt->length < 0 && !CPP_OPTIONS (pfile)->lang_asm
              && CPP_PEDANTIC (pfile))
            cpp_pedwarn (pfile, "invalid preprocessor directive name");
        }
      c = GETC ();
    }
  /* We're in the middle of a line.  Skip the rest of it.  */
  for (;;) {
    switch (c)
      {
        long old;
      case EOF:
        goto done;
      case '/':                 /* possible comment */
        c = skip_comment (pfile, NULL);
        if (c == EOF)
          goto done;
        break;
      case '\"':
      case '\'':
        FORWARD(-1);
        old = CPP_WRITTEN (pfile);
        cpp_get_token (pfile);
        CPP_SET_WRITTEN (pfile, old);
        break;
      case '\\':
        /* Char after backslash loses its special meaning.  */
        if (PEEKC() == '\n')
          FORWARD (1);
        break;
      case '\n':
        goto beg_of_line;
        break;
      }
    c = GETC ();
  }
 done:
  if (CPP_OPTIONS (pfile)->output_conditionals) {
    static char end_failed[] = "#endfailed\n";
    CPP_PUTS (pfile, end_failed, sizeof(end_failed)-1);
    pfile->lineno++;
  }
  pfile->only_seen_white = 1;
  parse_goto_mark (&line_start_mark, pfile);
  parse_clear_mark (&line_start_mark);
}

/*
 * handle a #else directive.  Do this by just continuing processing
 * without changing  if_stack ;  this is so that the error message
 * for missing #endif's etc. will point to the original #if.  It
 * is possible that something different would be better.
 */

static int
do_else (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  cpp_buffer *ip = CPP_BUFFER (pfile);

  if (CPP_PEDANTIC (pfile))
    validate_else (pfile, "#else");
  skip_rest_of_line (pfile);

  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack) {
    cpp_error (pfile, "`#else' not within a conditional");
    return 0;
  } else {
    /* #ifndef can't have its special treatment for containing the whole file
       if it has a #else clause.  */
    pfile->if_stack->control_macro = 0;

    if (pfile->if_stack->type != T_IF && pfile->if_stack->type != T_ELIF) {
      cpp_error (pfile, "`#else' after `#else'");
      fprintf (stderr, " (matches line %d", pfile->if_stack->lineno);
      if (strcmp (pfile->if_stack->fname, ip->nominal_fname) != 0)
        fprintf (stderr, ", file %s", pfile->if_stack->fname);
      fprintf (stderr, ")\n");
    }
    pfile->if_stack->type = T_ELSE;
  }

  if (pfile->if_stack->if_succeeded)
    skip_if_group (pfile, 0);
  else {
    ++pfile->if_stack->if_succeeded;    /* continue processing input */
    output_line_command (pfile, 1, same_file);
  }
  return 0;
}

/*
 * unstack after #endif command
 */

static int
do_endif (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  if (CPP_PEDANTIC (pfile))
    validate_else (pfile, "#endif");
  skip_rest_of_line (pfile);

  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack)
    cpp_error (pfile, "unbalanced `#endif'");
  else
    {
      IF_STACK_FRAME *temp = pfile->if_stack;
      pfile->if_stack = temp->next;
      if (temp->control_macro != 0)
        {
          /* This #endif matched a #ifndef at the start of the file.
             See if it is at the end of the file.  */
          struct parse_marker start_mark;
          int c;

          parse_set_mark (&start_mark, pfile);

          for (;;)
            {
              cpp_skip_hspace (pfile);
              c = GETC ();
              if (c != '\n')
                break;
            }
          parse_goto_mark (&start_mark, pfile);
          parse_clear_mark (&start_mark);

          if (c == EOF)
            {
              /* If we get here, this #endif ends a #ifndef
                 that contains all of the file (aside from whitespace).
                 Arrange not to include the file again
                 if the macro that was tested is defined.

                 Do not do this for the top-level file in a -include or any
                 file in a -imacros.  */
#if 0
FIXME!
              if (indepth != 0
                  && ! (indepth == 1 && pfile->no_record_file)
                  && ! (pfile->no_record_file && no_output))
#endif
                {
                  struct file_name_list *ifile = pfile->all_include_files;
                  
                  for ( ; ifile != NULL; ifile = ifile->next)
                    {
                      if (!strcmp (ifile->fname, CPP_BUFFER (pfile)->fname))
                        {
                          ifile->control_macro = temp->control_macro;
                          break;
                        }
                    }
                }
            }
        }
      free (temp);
      output_line_command (pfile, 1, same_file);
    }
  return 0;
}

/* When an #else or #endif is found while skipping failed conditional,
   if -pedantic was specified, this is called to warn about text after
   the command name.  P points to the first char after the command name.  */

static void
validate_else (pfile, directive)
     cpp_reader *pfile;
     char *directive;
{
  int c;
  cpp_skip_hspace (pfile);
  c = PEEKC ();
  if (c != EOF && c != '\n')
    cpp_pedwarn (pfile,
                 "text following `%s' violates ANSI standard", directive);
}

/* Get the next token, and add it to the text in pfile->token_buffer.
   Return the kind of token we got.  */
  
enum cpp_token
cpp_get_token (pfile)
     cpp_reader *pfile;
{
  register int c, c2, c3;
  long old_written;
  long start_line, start_column;
  enum cpp_token token;
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  CPP_BUFFER (pfile)->prev = CPP_BUFFER (pfile)->cur;
 get_next:
  c = GETC();
  if (c == EOF)
    {
    handle_eof:
      if (CPP_BUFFER (pfile)->seen_eof)
        {
          if (cpp_pop_buffer (pfile) != CPP_NULL_BUFFER (pfile))
            goto get_next;
          else
            return CPP_EOF;
        }
      else
        {
          cpp_buffer *next_buf
            = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
          CPP_BUFFER (pfile)->seen_eof = 1;
          if (CPP_BUFFER (pfile)->nominal_fname
              && next_buf != CPP_NULL_BUFFER (pfile))
            {
              /* We're about to return from an #include file.
                 Emit #line information now (as part of the CPP_POP) result.
                 But the #line refers to the file we will pop to.  */
              cpp_buffer *cur_buffer = CPP_BUFFER (pfile);
              CPP_BUFFER (pfile) = next_buf;
              pfile->input_stack_listing_current = 0;
              output_line_command (pfile, 0, leave_file);
              CPP_BUFFER (pfile) = cur_buffer;
            }
          return CPP_POP;
        }
    }
  else
    {
      switch (c)
        {
          long newlines;
          struct parse_marker start_mark;
        case '/':
          if (PEEKC () == '=')
            goto op2;
          if (opts->put_out_comments)
            parse_set_mark (&start_mark, pfile);
          newlines = 0;
          cpp_buf_line_and_col (cpp_file_buffer (pfile),
                                &start_line, &start_column);
          c = skip_comment (pfile, &newlines);
          if (opts->put_out_comments && (c == '/' || c == EOF))
            parse_clear_mark (&start_mark);
          if (c == '/')
            goto randomchar;
          if (c == EOF)
            {
              cpp_error_with_line (pfile, start_line, start_column,
                                   "unterminated comment");
              goto handle_eof;
            }
          c = '/';  /* Initial letter of comment.  */
        return_comment:
          /* Comments are equivalent to spaces.
             For -traditional, a comment is equivalent to nothing.  */
          if (opts->put_out_comments)
            {
              cpp_buffer *pbuf = CPP_BUFFER (pfile);
              U_CHAR *start = pbuf->buf + start_mark.position;
              int len = pbuf->cur - start;
              CPP_RESERVE(pfile, 1 + len);
              CPP_PUTC_Q (pfile, c);
              CPP_PUTS_Q (pfile, start, len);
              pfile->lineno += newlines;
              parse_clear_mark (&start_mark);
              return CPP_COMMENT;
            }
          else if (CPP_TRADITIONAL (pfile))
            {
              return CPP_COMMENT;
            }
          else
            {
#if 0
              /* This may not work if cpp_get_token is called recursively,
                 since many places look for horizontal space.  */
              if (newlines)
                {
                  /* Copy the newlines into the output buffer, in order to
                     avoid the pain of a #line every time a multiline comment
                     is seen.  */
                  CPP_RESERVE(pfile, newlines);
                  while (--newlines >= 0)
                    {
                      CPP_PUTC_Q (pfile, '\n');
                      pfile->lineno++;
                    }
                  return CPP_VSPACE;
                }
#endif
              CPP_RESERVE(pfile, 1);
              CPP_PUTC_Q (pfile, ' ');
              return CPP_HSPACE;
            }
#if 0
          if (opts->for_lint) {
            U_CHAR *argbp;
            int cmdlen, arglen;
            char *lintcmd = get_lintcmd (ibp, limit, &argbp, &arglen, &cmdlen);
            
            if (lintcmd != NULL) {
              /* I believe it is always safe to emit this newline: */
              obp[-1] = '\n';
              bcopy ("#pragma lint ", (char *) obp, 13);
              obp += 13;
              bcopy (lintcmd, (char *) obp, cmdlen);
              obp += cmdlen;

              if (arglen != 0) {
                *(obp++) = ' ';
                bcopy (argbp, (char *) obp, arglen);
                obp += arglen;
              }

              /* OK, now bring us back to the state we were in before we entered
                 this branch.  We need #line because the newline for the pragma
                 could mess things up.  */
              output_line_command (pfile, 0, same_file);
              *(obp++) = ' ';   /* just in case, if comments are copied thru */
              *(obp++) = '/';
            }
          }
#endif

        case '#':
#if 0
          /* If this is expanding a macro definition, don't recognize
             preprocessor directives.  */
          if (ip->macro != 0)
            goto randomchar;
          /* If this is expand_into_temp_buffer, recognize them
             only after an actual newline at this level,
             not at the beginning of the input level.  */
          if (ip->fname == 0 && beg_of_line == ip->buf)
            goto randomchar;
          if (ident_length)
            goto specialchar;
#endif

          if (!pfile->only_seen_white)
            goto randomchar;
          if (handle_directive (pfile))
            return CPP_DIRECTIVE;
          pfile->only_seen_white = 0;
          return CPP_OTHER;

        case '\"':
        case '\'':
          /* A single quoted string is treated like a double -- some
             programs (e.g., troff) are perverse this way */
          cpp_buf_line_and_col (cpp_file_buffer (pfile),
                                &start_line, &start_column);
          old_written = CPP_WRITTEN (pfile);
        string:
          CPP_PUTC (pfile, c);
          while (1)
            {
              int cc = GETC();
              if (cc == EOF)
                {
                  if (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
                    {
                      /* try harder: this string crosses a macro expansion
                         boundary.  This can happen naturally if -traditional.
                         Otherwise, only -D can make a macro with an unmatched
                         quote.  */
                        cpp_buffer *next_buf
                            = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
                        (*CPP_BUFFER (pfile)->cleanup)
                            (CPP_BUFFER (pfile), pfile);
                        CPP_BUFFER (pfile) = next_buf;
                        continue;
                    }
                  if (!CPP_TRADITIONAL (pfile))
                    {
                      cpp_error_with_line (pfile, start_line, start_column,
                              "unterminated string or character constant");
                      if (pfile->multiline_string_line != start_line
                          && pfile->multiline_string_line != 0)
                        cpp_error_with_line (pfile,
                                             pfile->multiline_string_line, -1,
                               "possible real start of unterminated constant");
                      pfile->multiline_string_line = 0;
                    }
                  break;
                }
              CPP_PUTC (pfile, cc);
              switch (cc)
                {
                case '\n':
                  /* Traditionally, end of line ends a string constant with
                 no error.  So exit the loop and record the new line.  */
                  if (CPP_TRADITIONAL (pfile))
                    goto while2end;
                  if (c == '\'')
                    {
                      cpp_error_with_line (pfile, start_line, start_column,
                                           "unterminated character constant");
                      goto while2end;
                    }
                  if (CPP_PEDANTIC (pfile)
                      && pfile->multiline_string_line == 0)
                    {
                      cpp_pedwarn_with_line (pfile, start_line, start_column,
                               "string constant runs past end of line");
                    }
                  if (pfile->multiline_string_line == 0)
                    pfile->multiline_string_line = start_line;
                  break;
                
                case '\\':
                  cc = GETC();
                  if (cc == '\n')
                    {
                      /* Backslash newline is replaced by nothing at all.  */
                      CPP_ADJUST_WRITTEN (pfile, -1);
                      pfile->lineno++;
                    }
                  else
                    {
                      /* ANSI stupidly requires that in \\ the second \
                         is *not* prevented from combining with a newline.  */
                      NEWLINE_FIX1(cc);
                      if (cc != EOF)
                        CPP_PUTC (pfile, cc);
                    }
                  break;

                case '\"':
                case '\'':
                  if (cc == c)
                    goto while2end;
                  break;
                }
            }
        while2end:
          pfile->lineno += count_newlines (pfile->token_buffer + old_written,
                                           CPP_PWRITTEN (pfile));
          pfile->only_seen_white = 0;
          return c == '\'' ? CPP_CHAR : CPP_STRING;

        case '$':
          if (!opts->dollars_in_ident)
            goto randomchar;
          goto letter;

        case ':':
          if (opts->cplusplus && PEEKC () == ':')
            goto op2;
          goto randomchar;

        case '&':
        case '+':
        case '|':
          NEWLINE_FIX;
          c2 = PEEKC ();
          if (c2 == c || c2 == '=')
            goto op2;
          goto randomchar;

        case '*':
        case '!':
        case '%':
        case '=':
        case '^':
          NEWLINE_FIX;
          if (PEEKC () == '=')
            goto op2;
          goto randomchar;

        case '-':
          NEWLINE_FIX;
          c2 = PEEKC ();
          if (c2 == '-' && opts->chill)
            {
              /* Chill style comment */
              if (opts->put_out_comments)
                parse_set_mark (&start_mark, pfile);
              FORWARD(1);  /* Skip second '-'.  */
              for (;;)
                {
                  c = GETC ();
                  if (c == EOF)
                    break;
                  if (c == '\n')
                    {
                      /* Don't consider final '\n' to be part of comment.  */
                      FORWARD(-1);
                      break;
                    }
                }
              c = '-';
              goto return_comment;
            }
          if (c2 == '-' || c2 == '=' || c2 == '>')
            goto op2;
          goto randomchar;

        case '<':
          if (pfile->parsing_include_directive)
            {
              for (;;)
                {
                  CPP_PUTC (pfile, c);
                  if (c == '>')
                    break;
                  c = GETC ();
                  NEWLINE_FIX1 (c);
                  if (c == '\n' || c == EOF)
                    {
                      cpp_error (pfile,
                                 "missing '>' in `#include <FILENAME>'");
                      break;
                    }
                }
              return CPP_STRING;
            }
          /* else fall through */
        case '>':
          NEWLINE_FIX;
          c2 = PEEKC ();
          if (c2 == '=')
            goto op2;
          if (c2 != c)
            goto randomchar;
          FORWARD(1);
          CPP_RESERVE (pfile, 4);
          CPP_PUTC (pfile, c);
          CPP_PUTC (pfile, c2);
          NEWLINE_FIX;
          c3 = PEEKC ();
          if (c3 == '=')
            CPP_PUTC_Q (pfile, GETC ());
          CPP_NUL_TERMINATE_Q (pfile);
          pfile->only_seen_white = 0;
          return CPP_OTHER;

        case '@':
          if (CPP_BUFFER (pfile)->has_escapes)
            {
              c = GETC ();
              if (c == '-')
                {
                  if (pfile->output_escapes)
                    CPP_PUTS (pfile, "@-", 2);
                  parse_name (pfile, GETC ());
                  return CPP_NAME;
                }
              else if (is_space [c])
                {
                  CPP_RESERVE (pfile, 2);
                  if (pfile->output_escapes)
                    CPP_PUTC_Q (pfile, '@');
                  CPP_PUTC_Q (pfile, c);
                  return CPP_HSPACE;
                }
            }
          if (pfile->output_escapes)
            {
              CPP_PUTS (pfile, "@@", 2);
              return CPP_OTHER;
            }
          goto randomchar;

        case '.':
          NEWLINE_FIX;
          c2 = PEEKC ();
          if (isdigit(c2))
            {
              CPP_RESERVE(pfile, 2);
              CPP_PUTC_Q (pfile, '.');
              c = GETC ();
              goto number;
            }
          /* FIXME - misses the case "..\\\n." */
          if (c2 == '.' && PEEKN(1) == '.')
            {
              CPP_RESERVE(pfile, 4);
              CPP_PUTC_Q (pfile, '.');
              CPP_PUTC_Q (pfile, '.');
              CPP_PUTC_Q (pfile, '.');
              FORWARD (2);
              CPP_NUL_TERMINATE_Q (pfile);
              pfile->only_seen_white = 0;
              return CPP_3DOTS;
            }
          goto randomchar;

        op2:
          token = CPP_OTHER;
          pfile->only_seen_white = 0;
        op2any:
          CPP_RESERVE(pfile, 3);
          CPP_PUTC_Q (pfile, c);
          CPP_PUTC_Q (pfile, GETC ());
          CPP_NUL_TERMINATE_Q (pfile);
          return token;

        case 'L':
          NEWLINE_FIX;
          c2 = PEEKC ();
          if ((c2 == '\'' || c2 == '\"') && !CPP_TRADITIONAL (pfile))
            {
              CPP_PUTC (pfile, c);
              c = GETC ();
              goto string;
            }
          goto letter;

        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
        number:
          c2  = '.';
          for (;;)
            {
              CPP_RESERVE (pfile, 2);
              CPP_PUTC_Q (pfile, c);
              NEWLINE_FIX;
              c = PEEKC ();
              if (c == EOF)
                break;
              if (!is_idchar[c] && c != '.'
                  && ((c2 != 'e' && c2 != 'E'
                       && ((c2 != 'p' && c2 != 'P') || CPP_C89 (pfile)))
                      || (c != '+' && c != '-')))
                break;
              FORWARD(1);
              c2= c;
            }
          CPP_NUL_TERMINATE_Q (pfile);
          pfile->only_seen_white = 0;
          return CPP_NUMBER;
        case 'b': case 'c': case 'd': case 'h': case 'o':
        case 'B': case 'C': case 'D': case 'H': case 'O':
          if (opts->chill && PEEKC () == '\'')
            {
              pfile->only_seen_white = 0;
              CPP_RESERVE (pfile, 2);
              CPP_PUTC_Q (pfile, c);
              CPP_PUTC_Q (pfile, '\'');
              FORWARD(1);
              for (;;)
                {
                  c = GETC();
                  if (c == EOF)
                    goto chill_number_eof;
                  if (!is_idchar[c])
                    {
                      if (c == '\\' && PEEKC() == '\n')
                        {
                          FORWARD(2);
                          continue;
                        }
                      break;
                    }
                  CPP_PUTC (pfile, c);
                }
              if (c == '\'')
                {
                  CPP_RESERVE (pfile, 2);
                  CPP_PUTC_Q (pfile, c);
                  CPP_NUL_TERMINATE_Q (pfile);
                  return CPP_STRING;
                }
              else
                {
                  FORWARD(-1);
                chill_number_eof:
                  CPP_NUL_TERMINATE (pfile);
                  return CPP_NUMBER;
                }
            }
          else
            goto letter;
        case '_':
        case 'a': case 'e': case 'f': case 'g': case 'i': case 'j':
        case 'k': case 'l': case 'm': case 'n': case 'p': case 'q':
        case 'r': case 's': case 't': case 'u': case 'v': case 'w':
        case 'x': case 'y': case 'z':
        case 'A': case 'E': case 'F': case 'G': case 'I': case 'J':
        case 'K': case 'M': case 'N': case 'P': case 'Q': case 'R':
        case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
        case 'Y': case 'Z':
        letter:
          {
            HASHNODE *hp;
            unsigned char *ident;
            int before_name_written = CPP_WRITTEN (pfile);
            int ident_len;
            parse_name (pfile, c);
            pfile->only_seen_white = 0;
            if (pfile->no_macro_expand)
              return CPP_NAME;
            ident = pfile->token_buffer + before_name_written;
            ident_len = CPP_PWRITTEN (pfile) - ident;
            hp = cpp_lookup (pfile, ident, ident_len, -1);
            if (!hp)
              return CPP_NAME;
            if (hp->type == T_DISABLED)
              {
                if (pfile->output_escapes)
                  { /* Return "@-IDENT", followed by '\0'.  */
                    int i;
                    CPP_RESERVE (pfile, 3);
                    ident = pfile->token_buffer + before_name_written;
                    CPP_ADJUST_WRITTEN (pfile, 2);
                    for (i = ident_len; i >= 0; i--) ident[i+2] = ident[i];
                    ident[0] = '@';
                    ident[1] = '-';
                  }
                return CPP_NAME;
              }

            /* If macro wants an arglist, verify that a '(' follows.
               first skip all whitespace, copying it to the output
               after the macro name.  Then, if there is no '(',
               decide this is not a macro call and leave things that way.  */
            if (hp->type == T_MACRO && hp->value.defn->nargs >= 0)
            {
              struct parse_marker macro_mark;
              int is_macro_call;
              while (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
                {
                  cpp_buffer *next_buf;
                  cpp_skip_hspace (pfile);
                  if (PEEKC () != EOF)
                    break;
                  next_buf = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
                  (*CPP_BUFFER (pfile)->cleanup) (CPP_BUFFER (pfile), pfile);
                  CPP_BUFFER (pfile) = next_buf;
                }
              parse_set_mark (&macro_mark, pfile);
              for (;;)
                {
                  cpp_skip_hspace (pfile);
                  c = PEEKC ();
                  is_macro_call = c == '(';
                  if (c != '\n')
                    break;
                  FORWARD (1);
                }
              if (!is_macro_call)
                parse_goto_mark (&macro_mark, pfile);
              parse_clear_mark (&macro_mark);
              if (!is_macro_call)
                return CPP_NAME;
            }
            /* This is now known to be a macro call.  */

            /* it might not actually be a macro.  */
            if (hp->type != T_MACRO) {
              int xbuf_len;  U_CHAR *xbuf;
              CPP_SET_WRITTEN (pfile, before_name_written);
              special_symbol (hp, pfile);
              xbuf_len = CPP_WRITTEN (pfile) - before_name_written;
              xbuf = (U_CHAR *) xmalloc (xbuf_len + 1);
              CPP_SET_WRITTEN (pfile, before_name_written);
              bcopy (CPP_PWRITTEN (pfile), xbuf, xbuf_len + 1);
              push_macro_expansion (pfile, xbuf, xbuf_len, hp);
            }
            else
              {
                /* Expand the macro, reading arguments as needed,
                   and push the expansion on the input stack.  */
                macroexpand (pfile, hp);
                CPP_SET_WRITTEN (pfile, before_name_written);
              }

            /* An extra "@ " is added to the end of a macro expansion
               to prevent accidental token pasting.  We prefer to avoid
               unneeded extra spaces (for the sake of cpp-using tools like
               imake).  Here we remove the space if it is safe to do so.  */
            if (pfile->buffer->rlimit - pfile->buffer->cur >= 3
                && pfile->buffer->rlimit[-2] == '@'
                && pfile->buffer->rlimit[-1] == ' ')
              {
                int c1 = pfile->buffer->rlimit[-3];
                int c2 = CPP_BUF_PEEK (CPP_PREV_BUFFER (CPP_BUFFER (pfile)));
                if (c2 == EOF || ! unsafe_chars (c1, c2))
                  pfile->buffer->rlimit -= 2;
              }
          }
          goto get_next;

        case ' ':  case '\t':  case '\v':  case '\r':
          for (;;)
            {
              CPP_PUTC (pfile, c);
              c = PEEKC ();
              if (c == EOF || !is_hor_space[c])
                break;
              FORWARD(1);
            }
          return CPP_HSPACE;

        case '\\':
          c2 = PEEKC ();
          if (c2 != '\n')
            goto randomchar;
          token = CPP_HSPACE;
          goto op2any;

        case '\n':
          CPP_PUTC (pfile, c);
          if (pfile->only_seen_white == 0)
            pfile->only_seen_white = 1;
          pfile->lineno++;
          output_line_command (pfile, 1, same_file);
          return CPP_VSPACE;

        case '(': token = CPP_LPAREN;    goto char1;
        case ')': token = CPP_RPAREN;    goto char1;
        case '{': token = CPP_LBRACE;    goto char1;
        case '}': token = CPP_RBRACE;    goto char1;
        case ',': token = CPP_COMMA;     goto char1;
        case ';': token = CPP_SEMICOLON; goto char1;

        randomchar:
        default:
          token = CPP_OTHER;
        char1:
          pfile->only_seen_white = 0;
          CPP_PUTC (pfile, c);
          return token;
        }
    }
}

/* Like cpp_get_token, but skip spaces and comments.  */

enum cpp_token
cpp_get_non_space_token (pfile)
     cpp_reader *pfile;
{
  int old_written = CPP_WRITTEN (pfile);
  for (;;)
    {
      enum cpp_token token = cpp_get_token (pfile);
      if (token != CPP_COMMENT && token != CPP_POP
          && token != CPP_HSPACE && token != CPP_VSPACE)
        return token;
      CPP_SET_WRITTEN (pfile, old_written);
    }
}

/* Parse an identifier starting with C.  */

int
parse_name (pfile, c)
     cpp_reader *pfile; int c;
{
  for (;;)
  {
      if (! is_idchar[c])
      {
          if (c == '\\' && PEEKC() == '\n')
          {
              FORWARD(2);
              continue;
          }
          FORWARD (-1);
          break;
      }

      if (c == '$' && CPP_PEDANTIC (pfile))
        cpp_pedwarn ("`$' in identifier");

      CPP_RESERVE(pfile, 2); /* One more for final NUL.  */
      CPP_PUTC_Q (pfile, c);
      c = GETC();
      if (c == EOF)
        break;
  }
  CPP_NUL_TERMINATE_Q (pfile);
  return 1;
}

\f
/* Maintain and search list of included files, for #import.  */

/* Hash a file name for import_hash_table.  */

static int 
import_hash (f)
     char *f;
{
  int val = 0;

  while (*f) val += *f++;
  return (val%IMPORT_HASH_SIZE);
}

/* Search for file FILENAME in import_hash_table.
   Return -2 if found, either a matching name or a matching inode.
   Otherwise, open the file and return a file descriptor if successful
   or -1 if unsuccessful.  */

static int
lookup_import (pfile, filename, searchptr)
     cpp_reader *pfile;
     char *filename;
     struct file_name_list *searchptr;
{
  struct import_file *i;
  int h;
  int hashval;
  struct stat sb;
  int fd;

  hashval = import_hash (filename);

  /* Attempt to find file in list of already included files */
  i = pfile->import_hash_table[hashval];

  while (i) {
    if (!strcmp (filename, i->name))
      return -2;                /* return found */
    i = i->next;
  }
  /* Open it and try a match on inode/dev */
  fd = open_include_file (pfile, filename, searchptr);
  if (fd < 0)
    return fd;
  fstat (fd, &sb);
  for (h = 0; h < IMPORT_HASH_SIZE; h++) {
    i = pfile->import_hash_table[h];
    while (i) {
      /* Compare the inode and the device.
         Supposedly on some systems the inode is not a scalar.  */
      if (!bcmp ((char *) &i->inode, (char *) &sb.st_ino, sizeof (sb.st_ino))
          && i->dev == sb.st_dev) {
        close (fd);
        return -2;              /* return found */
      }
      i = i->next;
    }
  }
  return fd;                    /* Not found, return open file */
}

/* Add the file FNAME, open on descriptor FD, to import_hash_table.  */

static void
add_import (pfile, fd, fname)
     cpp_reader *pfile;
     int fd;
     char *fname;
{
  struct import_file *i;
  int hashval;
  struct stat sb;

  hashval = import_hash (fname);
  fstat (fd, &sb);
  i = (struct import_file *)xmalloc (sizeof (struct import_file));
  i->name = (char *)xmalloc (strlen (fname)+1);
  strcpy (i->name, fname);
  bcopy ((char *) &sb.st_ino, (char *) &i->inode, sizeof (sb.st_ino));
  i->dev = sb.st_dev;
  i->next = pfile->import_hash_table[hashval];
  pfile->import_hash_table[hashval] = i;
}
\f
/* The file_name_map structure holds a mapping of file names for a
   particular directory.  This mapping is read from the file named
   FILE_NAME_MAP_FILE in that directory.  Such a file can be used to
   map filenames on a file system with severe filename restrictions,
   such as DOS.  The format of the file name map file is just a series
   of lines with two tokens on each line.  The first token is the name
   to map, and the second token is the actual name to use.  */

struct file_name_map
{
  struct file_name_map *map_next;
  char *map_from;
  char *map_to;
};

#define FILE_NAME_MAP_FILE "header.gcc"

/* Read a space delimited string of unlimited length from a stdio
   file.  */

static char *
read_filename_string (ch, f)
     int ch;
     FILE *f;
{
  char *alloc, *set;
  int len;

  len = 20;
  set = alloc = xmalloc (len + 1);
  if (! is_space[ch])
    {
      *set++ = ch;
      while ((ch = getc (f)) != EOF && ! is_space[ch])
        {
          if (set - alloc == len)
            {
              len *= 2;
              alloc = xrealloc (alloc, len + 1);
              set = alloc + len / 2;
            }
          *set++ = ch;
        }
    }
  *set = '\0';
  ungetc (ch, f);
  return alloc;
}

/* This structure holds a linked list of file name maps, one per directory.  */

struct file_name_map_list
{
  struct file_name_map_list *map_list_next;
  char *map_list_name;
  struct file_name_map *map_list_map;
};

/* Read the file name map file for DIRNAME.  */

static struct file_name_map *
read_name_map (pfile, dirname)
     cpp_reader *pfile;
     char *dirname;
{
  register struct file_name_map_list *map_list_ptr;
  char *name;
  FILE *f;

  for (map_list_ptr = CPP_OPTIONS (pfile)->map_list; map_list_ptr;
       map_list_ptr = map_list_ptr->map_list_next)
    if (! strcmp (map_list_ptr->map_list_name, dirname))
      return map_list_ptr->map_list_map;

  map_list_ptr = ((struct file_name_map_list *)
                  xmalloc (sizeof (struct file_name_map_list)));
  map_list_ptr->map_list_name = savestring (dirname);
  map_list_ptr->map_list_map = NULL;

  name = (char *) alloca (strlen (dirname) + strlen (FILE_NAME_MAP_FILE) + 2);
  strcpy (name, dirname);
  if (*dirname)
    strcat (name, "/");
  strcat (name, FILE_NAME_MAP_FILE);
  f = fopen (name, "r");
  if (!f)
    map_list_ptr->map_list_map = NULL;
  else
    {
      int ch;
      int dirlen = strlen (dirname);

      while ((ch = getc (f)) != EOF)
        {
          char *from, *to;
          struct file_name_map *ptr;

          if (is_space[ch])
            continue;
          from = read_filename_string (ch, f);
          while ((ch = getc (f)) != EOF && is_hor_space[ch])
            ;
          to = read_filename_string (ch, f);

          ptr = ((struct file_name_map *)
                 xmalloc (sizeof (struct file_name_map)));
          ptr->map_from = from;

          /* Make the real filename absolute.  */
          if (*to == '/')
            ptr->map_to = to;
          else
            {
              ptr->map_to = xmalloc (dirlen + strlen (to) + 2);
              strcpy (ptr->map_to, dirname);
              ptr->map_to[dirlen] = '/';
              strcpy (ptr->map_to + dirlen + 1, to);
              free (to);
            }         

          ptr->map_next = map_list_ptr->map_list_map;
          map_list_ptr->map_list_map = ptr;

          while ((ch = getc (f)) != '\n')
            if (ch == EOF)
              break;
        }
      fclose (f);
    }
  
  map_list_ptr->map_list_next = CPP_OPTIONS (pfile)->map_list;
  CPP_OPTIONS (pfile)->map_list = map_list_ptr;

  return map_list_ptr->map_list_map;
}  

/* Try to open include file FILENAME.  SEARCHPTR is the directory
   being tried from the include file search path.  This function maps
   filenames on file systems based on information read by
   read_name_map.  */

static int
open_include_file (pfile, filename, searchptr)
     cpp_reader *pfile;
     char *filename;
     struct file_name_list *searchptr;
{
  if (CPP_OPTIONS (pfile)->remap)
    {
      register struct file_name_map *map;
      register char *from;
      char *p, *dir;

      if (searchptr && ! searchptr->got_name_map)
        {
          searchptr->name_map = read_name_map (pfile,
                                               searchptr->fname
                                               ? searchptr->fname : ".");
          searchptr->got_name_map = 1;
        }

      /* First check the mapping for the directory we are using.  */
      if (searchptr && searchptr->name_map)
        {
          from = filename;
          if (searchptr->fname)
            from += strlen (searchptr->fname) + 1;
          for (map = searchptr->name_map; map; map = map->map_next)
            {
              if (! strcmp (map->map_from, from))
                {
                  /* Found a match.  */
                  return open (map->map_to, O_RDONLY, 0666);
                }
            }
        }

      /* Try to find a mapping file for the particular directory we are
         looking in.  Thus #include <sys/types.h> will look up sys/types.h
         in /usr/include/header.gcc and look up types.h in
         /usr/include/sys/header.gcc.  */
      p = rindex (filename, '/');
      if (! p)
        p = filename;
      if (searchptr
          && searchptr->fname
          && strlen (searchptr->fname) == p - filename
          && ! strncmp (searchptr->fname, filename, p - filename))
        {
          /* FILENAME is in SEARCHPTR, which we've already checked.  */
          return open (filename, O_RDONLY, 0666);
        }

      if (p == filename)
        {
          dir = ".";
          from = filename;
        }
      else
        {
          dir = (char *) alloca (p - filename + 1);
          bcopy (filename, dir, p - filename);
          dir[p - filename] = '\0';
          from = p + 1;
        }
      for (map = read_name_map (pfile, dir); map; map = map->map_next)
        if (! strcmp (map->map_from, from))
          return open (map->map_to, O_RDONLY, 0666);
    }

  return open (filename, O_RDONLY, 0666);
}

/* Process the contents of include file FNAME, already open on descriptor F,
   with output to OP.
   SYSTEM_HEADER_P is 1 if this file resides in any one of the known
   "system" include directories (as decided by the `is_system_include'
   function above).
   DIRPTR is the link in the dir path through which this file was found,
   or 0 if the file name was absolute or via the current directory.
   Return 1 on success, 0 on failure.

   The caller is responsible for the cpp_push_buffer.  */

static int
finclude (pfile, f, fname, system_header_p, dirptr)
     cpp_reader *pfile;
     int f;
     char *fname;
     int system_header_p;
     struct file_name_list *dirptr;
{
  struct stat st;
  size_t st_size;
  long i;
  int length;
  cpp_buffer *fp;                       /* For input stack frame */
#if 0
  int missing_newline = 0;
#endif

  if (fstat (f, &st) < 0)
    {
      cpp_perror_with_name (pfile, fname);
      close (f);
      cpp_pop_buffer (pfile);
      return 0;
    }

  fp = CPP_BUFFER (pfile);
  fp->nominal_fname = fp->fname = fname;
#if 0
  fp->length = 0;
#endif
  fp->dir = dirptr;
  fp->system_header_p = system_header_p;
  fp->lineno = 1;
  fp->colno = 1;
  fp->cleanup = file_cleanup;

  if (S_ISREG (st.st_mode)) {
    st_size = (size_t) st.st_size;
    if (st_size != st.st_size || st_size + 2 < st_size) {
      cpp_error (pfile, "file `%s' too large", fname);
      close (f);
      return 0;
    }
    fp->buf = (U_CHAR *) xmalloc (st_size + 2);
    fp->alimit = fp->buf + st_size + 2;
    fp->cur = fp->buf;

    /* Read the file contents, knowing that st_size is an upper bound
       on the number of bytes we can read.  */
    length = safe_read (f, fp->buf, st_size);
    fp->rlimit = fp->buf + length;
    if (length < 0) goto nope;
  }
  else if (S_ISDIR (st.st_mode)) {
    cpp_error (pfile, "directory `%s' specified in #include", fname);
    close (f);
    return 0;
  } else {
    /* Cannot count its file size before reading.
       First read the entire file into heap and
       copy them into buffer on stack.  */

    int bsize = 2000;

    st_size = 0;
    fp->buf = (U_CHAR *) xmalloc (bsize + 2);

    for (;;) {
      i = safe_read (f, fp->buf + st_size, bsize - st_size);
      if (i < 0)
        goto nope;      /* error! */
      st_size += i;
      if (st_size != bsize)
        break;  /* End of file */
      bsize *= 2;
      fp->buf = (U_CHAR *) xrealloc (fp->buf, bsize + 2);
    }
    fp->cur = fp->buf;
    length = st_size;
  }

  if ((length > 0 && fp->buf[length - 1] != '\n')
      /* Backslash-newline at end is not good enough.  */
      || (length > 1 && fp->buf[length - 2] == '\\')) {
    fp->buf[length++] = '\n';
#if 0
    missing_newline = 1;
#endif
  }
  fp->buf[length] = '\0';
  fp->rlimit = fp->buf + length;

  /* Close descriptor now, so nesting does not use lots of descriptors.  */
  close (f);

  /* Must do this before calling trigraph_pcp, so that the correct file name
     will be printed in warning messages.  */

  pfile->input_stack_listing_current = 0;

#if 0
  if (!no_trigraphs)
    trigraph_pcp (fp);
#endif

#if 0
  rescan (op, 0);

  if (missing_newline)
    fp->lineno--;

  if (CPP_PEDANTIC (pfile) && missing_newline)
    pedwarn ("file does not end in newline");

  indepth--;
  input_file_stack_tick++;
  free (fp->buf);
#endif
  return 1;

 nope:

  cpp_perror_with_name (pfile, fname);
  close (f);
  free (fp->buf);
  return 1;
}

/* This is called after options have been processed.
 * Check options for consistency, and setup for processing input
 * from the file named FNAME.  (Use standard input if FNAME==NULL.)
 * Return 1 on success, 0 on failure.
 */

int
cpp_start_read (pfile, fname)
     cpp_reader *pfile;
     char *fname;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  struct cpp_pending *pend;
  char *p;
  int f;
  cpp_buffer *fp;

  /* The code looks at the defaults through this pointer, rather than through
     the constant structure above.  This pointer gets changed if an environment
     variable specifies other defaults.  */
  struct default_include *include_defaults = include_defaults_array;

  /* Add dirs from CPATH after dirs from -I.  */
  /* There seems to be confusion about what CPATH should do,
     so for the moment it is not documented.  */
  /* Some people say that CPATH should replace the standard include dirs,
     but that seems pointless: it comes before them, so it overrides them
     anyway.  */
  p = (char *) getenv ("CPATH");
  if (p != 0 && ! opts->no_standard_includes)
    path_include (pfile, p);

  /* Now that dollars_in_ident is known, initialize is_idchar.  */
  initialize_char_syntax (opts);

  /* Do partial setup of input buffer for the sake of generating
     early #line directives (when -g is in effect).  */
  fp = cpp_push_buffer (pfile, NULL, 0);
  if (!fp)
    return 0;
  if (opts->in_fname == NULL)
    opts->in_fname = "";
  fp->nominal_fname = fp->fname = opts->in_fname;
  fp->lineno = 0;

  /* Install __LINE__, etc.  Must follow initialize_char_syntax
     and option processing.  */
  initialize_builtins (pfile);

  /* Do standard #defines and assertions
     that identify system and machine type.  */

  if (!opts->inhibit_predefs) {
    char *p = (char *) alloca (strlen (predefs) + 1);
    strcpy (p, predefs);
    while (*p) {
      char *q;
      while (*p == ' ' || *p == '\t')
        p++;
      /* Handle -D options.  */ 
      if (p[0] == '-' && p[1] == 'D') {
        q = &p[2];
        while (*p && *p != ' ' && *p != '\t')
          p++;
        if (*p != 0)
          *p++= 0;
        if (opts->debug_output)
          output_line_command (pfile, 0, same_file);
        cpp_define (pfile, q);
        while (*p == ' ' || *p == '\t')
          p++;
      } else if (p[0] == '-' && p[1] == 'A') {
        /* Handle -A options (assertions).  */ 
        char *assertion;
        char *past_name;
        char *value;
        char *past_value;
        char *termination;
        int save_char;

        assertion = &p[2];
        past_name = assertion;
        /* Locate end of name.  */
        while (*past_name && *past_name != ' '
               && *past_name != '\t' && *past_name != '(')
          past_name++;
        /* Locate `(' at start of value.  */
        value = past_name;
        while (*value && (*value == ' ' || *value == '\t'))
          value++;
        if (*value++ != '(')
          abort ();
        while (*value && (*value == ' ' || *value == '\t'))
          value++;
        past_value = value;
        /* Locate end of value.  */
        while (*past_value && *past_value != ' '
               && *past_value != '\t' && *past_value != ')')
          past_value++;
        termination = past_value;
        while (*termination && (*termination == ' ' || *termination == '\t'))
          termination++;
        if (*termination++ != ')')
          abort ();
        if (*termination && *termination != ' ' && *termination != '\t')
          abort ();
        /* Temporarily null-terminate the value.  */
        save_char = *termination;
        *termination = '\0';
        /* Install the assertion.  */
        make_assertion (pfile, "-A", assertion);
        *termination = (char) save_char;
        p = termination;
        while (*p == ' ' || *p == '\t')
          p++;
      } else {
        abort ();
      }
    }
  }

  /* Now handle the command line options.  */

  /* Do -U's, -D's and -A's in the order they were seen.  */
  /* First reverse the list.  */
  opts->pending = nreverse_pending (opts->pending);

  for (pend = opts->pending;  pend;  pend = pend->next)
    {
      if (pend->cmd != NULL && pend->cmd[0] == '-')
        {
          switch (pend->cmd[1])
            {
            case 'U':
              if (opts->debug_output)
                output_line_command (pfile, 0, same_file);
              do_undef (pfile, NULL, pend->arg, pend->arg + strlen (pend->arg));
              break;
            case 'D':
              if (opts->debug_output)
                output_line_command (pfile, 0, same_file);
              cpp_define (pfile, pend->arg);
              break;
            case 'A':
              make_assertion (pfile, "-A", pend->arg);
              break;
            }
        }
    }

  opts->done_initializing = 1;

  { /* Read the appropriate environment variable and if it exists
       replace include_defaults with the listed path.  */
    char *epath = 0;
    switch ((opts->objc << 1) + opts->cplusplus)
      {
      case 0:
        epath = getenv ("C_INCLUDE_PATH");
        break;
      case 1:
        epath = getenv ("CPLUS_INCLUDE_PATH");
        break;
      case 2:
        epath = getenv ("OBJC_INCLUDE_PATH");
        break;
      case 3:
        epath = getenv ("OBJCPLUS_INCLUDE_PATH");
        break;
      }
    /* If the environment var for this language is set,
       add to the default list of include directories.  */
    if (epath) {
      char *nstore = (char *) alloca (strlen (epath) + 2);
      int num_dirs;
      char *startp, *endp;

      for (num_dirs = 1, startp = epath; *startp; startp++)
        if (*startp == PATH_SEPARATOR)
          num_dirs++;
      include_defaults
        = (struct default_include *) xmalloc ((num_dirs
                                               * sizeof (struct default_include))
                                              + sizeof (include_defaults_array));
      startp = endp = epath;
      num_dirs = 0;
      while (1) {
        /* Handle cases like c:/usr/lib:d:/gcc/lib */
        if ((*endp == PATH_SEPARATOR)
            || *endp == 0) {
          strncpy (nstore, startp, endp-startp);
          if (endp == startp)
            strcpy (nstore, ".");
          else
            nstore[endp-startp] = '\0';

          include_defaults[num_dirs].fname = savestring (nstore);
          include_defaults[num_dirs].component = 0;
          include_defaults[num_dirs].cplusplus = opts->cplusplus;
          include_defaults[num_dirs].cxx_aware = 1;
          num_dirs++;
          if (*endp == '\0')
            break;
          endp = startp = endp + 1;
        } else
          endp++;
      }
      /* Put the usual defaults back in at the end.  */
      bcopy ((char *) include_defaults_array,
             (char *) &include_defaults[num_dirs],
             sizeof (include_defaults_array));
    }
  }

  append_include_chain (pfile, opts->before_system, opts->last_before_system);
  opts->first_system_include = opts->before_system;

  /* Unless -fnostdinc,
     tack on the standard include file dirs to the specified list */
  if (!opts->no_standard_includes) {
    struct default_include *p = include_defaults;
    char *specd_prefix = opts->include_prefix;
    char *default_prefix = savestring (GCC_INCLUDE_DIR);
    int default_len = 0;
    /* Remove the `include' from /usr/local/lib/gcc.../include.  */
    if (!strcmp (default_prefix + strlen (default_prefix) - 8, "/include")) {
      default_len = strlen (default_prefix) - 7;
      default_prefix[default_len] = 0;
    }
    /* Search "translated" versions of GNU directories.
       These have /usr/local/lib/gcc... replaced by specd_prefix.  */
    if (specd_prefix != 0 && default_len != 0)
      for (p = include_defaults; p->fname; p++) {
        /* Some standard dirs are only for C++.  */
        if (!p->cplusplus
            || (opts->cplusplus && !opts->no_standard_cplusplus_includes)) {
          /* Does this dir start with the prefix?  */
          if (!strncmp (p->fname, default_prefix, default_len)) {
            /* Yes; change prefix and add to search list.  */
            struct file_name_list *new
              = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
            int this_len = strlen (specd_prefix) + strlen (p->fname) - default_len;
            char *str = (char *) xmalloc (this_len + 1);
            strcpy (str, specd_prefix);
            strcat (str, p->fname + default_len);
            new->fname = str;
            new->control_macro = 0;
            new->c_system_include_path = !p->cxx_aware;
            new->got_name_map = 0;
            append_include_chain (pfile, new, new);
            if (opts->first_system_include == 0)
              opts->first_system_include = new;
          }
        }
      }
    /* Search ordinary names for GNU include directories.  */
    for (p = include_defaults; p->fname; p++) {
      /* Some standard dirs are only for C++.  */
      if (!p->cplusplus
          || (opts->cplusplus && !opts->no_standard_cplusplus_includes)) {
        struct file_name_list *new
          = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
        new->control_macro = 0;
        new->c_system_include_path = !p->cxx_aware;
        new->fname = update_path (p->fname, p->component);
        new->got_name_map = 0;
        append_include_chain (pfile, new, new);
        if (opts->first_system_include == 0)
          opts->first_system_include = new;
      }
    }
  }

  /* Tack the after_include chain at the end of the include chain.  */
  append_include_chain (pfile, opts->after_include, opts->last_after_include);
  if (opts->first_system_include == 0)
    opts->first_system_include = opts->after_include;

  /* With -v, print the list of dirs to search.  */
  if (opts->verbose) {
    struct file_name_list *p;
    fprintf (stderr, "#include \"...\" search starts here:\n");
    for (p = opts->include; p; p = p->next) {
      if (p == opts->first_bracket_include)
        fprintf (stderr, "#include <...> search starts here:\n");
      fprintf (stderr, " %s\n", p->fname);
    }
    fprintf (stderr, "End of search list.\n");
  }

  /* Scan the -imacros files before the main input.
     Much like #including them, but with no_output set
     so that only their macro definitions matter.  */

  opts->no_output++; pfile->no_record_file++;
  for (pend = opts->pending;  pend;  pend = pend->next)
    {
      if (pend->cmd != NULL && strcmp (pend->cmd, "-imacros") == 0)
        {
          int fd = open (pend->arg, O_RDONLY, 0666);
          if (fd < 0)
            {
              cpp_perror_with_name (pfile, pend->arg);
              return 0;
            }
          if (!cpp_push_buffer (pfile, NULL, 0))
              return 0;
          finclude (pfile, fd, pend->arg, 0, NULL_PTR);
          cpp_scan_buffer (pfile);
        }
    }
  opts->no_output--; pfile->no_record_file--;

  /* Copy the entire contents of the main input file into
     the stacked input buffer previously allocated for it.  */
  if (fname == NULL || *fname == 0) {
    fname = "";
    f = 0;
  } else if ((f = open (fname, O_RDONLY, 0666)) < 0)
    cpp_pfatal_with_name (pfile, fname);

  /* -MG doesn't select the form of output and must be specified with one of
     -M or -MM.  -MG doesn't make sense with -MD or -MMD since they don't
     inhibit compilation.  */
  if (opts->print_deps_missing_files
      && (opts->print_deps == 0 || !opts->no_output))
    {
      cpp_fatal (pfile, "-MG must be specified with one of -M or -MM");
      return 0;
    }

  /* Either of two environment variables can specify output of deps.
     Its value is either "OUTPUT_FILE" or "OUTPUT_FILE DEPS_TARGET",
     where OUTPUT_FILE is the file to write deps info to
     and DEPS_TARGET is the target to mention in the deps.  */

  if (opts->print_deps == 0
      && (getenv ("SUNPRO_DEPENDENCIES") != 0
          || getenv ("DEPENDENCIES_OUTPUT") != 0)) {
    char *spec = getenv ("DEPENDENCIES_OUTPUT");
    char *s;
    char *output_file;

    if (spec == 0)
      {
        spec = getenv ("SUNPRO_DEPENDENCIES");
        opts->print_deps = 2;
      }
    else
      opts->print_deps = 1;

    s = spec;
    /* Find the space before the DEPS_TARGET, if there is one.  */
    /* This should use index.  (mrs) */
    while (*s != 0 && *s != ' ') s++;
    if (*s != 0)
      {
        opts->deps_target = s + 1;
        output_file = (char *) xmalloc (s - spec + 1);
        bcopy (spec, output_file, s - spec);
        output_file[s - spec] = 0;
      }
    else
      {
        opts->deps_target = 0;
        output_file = spec;
      }

    opts->deps_file = output_file;
    opts->print_deps_append = 1;
  }

  /* For -M, print the expected object file name
     as the target of this Make-rule.  */
  if (opts->print_deps)
    {
      pfile->deps_allocated_size = 200;
      pfile->deps_buffer = (char *) xmalloc (pfile->deps_allocated_size);
      pfile->deps_buffer[0] = 0;
      pfile->deps_size = 0;
      pfile->deps_column = 0;

      if (opts->deps_target)
        deps_output (pfile, opts->deps_target, ':');
      else if (*opts->in_fname == 0)
        deps_output (pfile, "-", ':');
      else
        {
          char *p, *q, *r;
          int len, x;
          static char *known_suffixes[] = { ".c", ".C", ".s", ".S", ".m",
                                     ".cc", ".cxx", ".cpp", ".cp",
                                     ".c++", 0
                                   };

          /* Discard all directory prefixes from filename.  */
          if ((q = rindex (opts->in_fname, '/')) != NULL
#ifdef DIR_SEPARATOR
              && (q = rindex (opts->in_fname, DIR_SEPARATOR)) != NULL
#endif
              )
            ++q;
          else
            q = opts->in_fname;

          /* Copy remainder to mungable area.  */
          p = (char *) alloca (strlen(q) + 8);
          strcpy (p, q);

          /* Output P, but remove known suffixes.  */
          len = strlen (p);
          q = p + len;
          /* Point to the filename suffix.  */
          r = rindex (p, '.');
          /* Compare against the known suffixes.  */
          x = 0;
          while (known_suffixes[x] != 0)
            {
              if (strncmp (known_suffixes[x], r, q - r) == 0)
                {
                  /* Make q point to the bit we're going to overwrite
                     with an object suffix.  */
                  q = r;
                  break;
                }
              x++;
            }

          /* Supply our own suffix.  */
#ifndef VMS
          strcpy (q, ".o");
#else
          strcpy (q, ".obj");
#endif

          deps_output (pfile, p, ':');
          deps_output (pfile, opts->in_fname, ' ');
        }
    }

#if 0
  /* Make sure data ends with a newline.  And put a null after it.  */

  if ((fp->length > 0 && fp->buf[fp->length - 1] != '\n')
      /* Backslash-newline at end is not good enough.  */
      || (fp->length > 1 && fp->buf[fp->length - 2] == '\\')) {
    fp->buf[fp->length++] = '\n';
    missing_newline = 1;
  }
  fp->buf[fp->length] = '\0';

  /* Unless inhibited, convert trigraphs in the input.  */

  if (!no_trigraphs)
    trigraph_pcp (fp);
#endif

  /* Scan the -include files before the main input.
   We push these in reverse order, so that the first one is handled first.  */

  pfile->no_record_file++;
  opts->pending = nreverse_pending (opts->pending);
  for (pend = opts->pending;  pend;  pend = pend->next)
    {
      if (pend->cmd != NULL && strcmp (pend->cmd, "-include") == 0)
        {
          int fd = open (pend->arg, O_RDONLY, 0666);
          if (fd < 0)
            {
              cpp_perror_with_name (pfile, pend->arg);
              return 0;
            }
          if (!cpp_push_buffer (pfile, NULL, 0))
            return 0;
          finclude (pfile, fd, pend->arg, 0, NULL_PTR);
        }
    }
  pfile->no_record_file--;

  /* Free the pending list.  */
  for (pend = opts->pending;  pend; )
    {
      struct cpp_pending *next = pend->next;
      free (pend);
      pend = next;
    }
  opts->pending = NULL;

#if 0
  /* Scan the input, processing macros and directives.  */

  rescan (&outbuf, 0);

  if (missing_newline)
    fp->lineno--;

  if (CPP_PEDANTIC (pfile) && missing_newline)
    pedwarn ("file does not end in newline");

#endif
  if (finclude (pfile, f, fname, 0, NULL_PTR))
    output_line_command (pfile, 0, same_file);
  return 1;
}

void
cpp_reader_init (pfile)
     cpp_reader *pfile;
{
  bzero ((char *) pfile, sizeof (cpp_reader));
  pfile->get_token = cpp_get_token;

  pfile->token_buffer_size = 200;
  pfile->token_buffer = (U_CHAR *) xmalloc (pfile->token_buffer_size);
  CPP_SET_WRITTEN (pfile, 0);

  pfile->system_include_depth = 0;
  pfile->dont_repeat_files = 0;
  pfile->all_include_files = 0;
  pfile->max_include_len = 0;
  pfile->timebuf = NULL;
  pfile->only_seen_white = 1;
  pfile->buffer = CPP_NULL_BUFFER(pfile);
}

static struct cpp_pending *
nreverse_pending (list)
     struct cpp_pending *list;
     
{
  register struct cpp_pending *prev = 0, *next, *pend;
  for (pend = list;  pend;  pend = next)
    {
      next = pend->next;
      pend->next = prev;
      prev = pend;
    }
  return prev;
}

static void
push_pending (pfile, cmd, arg)
     cpp_reader *pfile;
     char *cmd;
     char *arg;
{
  struct cpp_pending *pend
    = (struct cpp_pending *) xmalloc (sizeof (struct cpp_pending));
  pend->cmd = cmd;
  pend->arg = arg;
  pend->next = CPP_OPTIONS (pfile)->pending;
  CPP_OPTIONS (pfile)->pending = pend;
}

/* Handle command-line options in (argc, argv).
   Can be called multiple times, to handle multiple sets of options.
   Returns if an unrecognized option is seen.
   Returns number of handled arguments.  */

int
cpp_handle_options (pfile, argc, argv)
     cpp_reader *pfile;
     int argc;
     char **argv;
{
  int i;
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  for (i = 0; i < argc; i++) {
    if (argv[i][0] != '-') {
      if (opts->out_fname != NULL)
        {
          cpp_fatal (pfile, "Usage: %s [switches] input output", argv[0]);
          return argc;
        }
      else if (opts->in_fname != NULL)
        opts->out_fname = argv[i];
      else
        opts->in_fname = argv[i];
    } else {
      switch (argv[i][1]) {

      missing_filename:
        cpp_fatal (pfile, "Filename missing after `%s' option", argv[i]);
        return argc;
      missing_dirname:
        cpp_fatal (pfile, "Directory name missing after `%s' option", argv[i]);
        return argc;

      case 'i':
        if (!strcmp (argv[i], "-include")
            || !strcmp (argv[i], "-imacros")) {
          if (i + 1 == argc)
            goto missing_filename;
          else
            push_pending (pfile, argv[i], argv[i+1]), i++;
        }
        if (!strcmp (argv[i], "-iprefix")) {
          if (i + 1 == argc)
            goto missing_filename;
          else
            opts->include_prefix = argv[++i];
        }
        if (!strcmp (argv[i], "-ifoutput")) {
          opts->output_conditionals = 1;
        }
        if (!strcmp (argv[i], "-isystem")) {
          struct file_name_list *dirtmp;

          if (i + 1 == argc)
            goto missing_filename;

          dirtmp = (struct file_name_list *)
            xmalloc (sizeof (struct file_name_list));
          dirtmp->next = 0;
          dirtmp->control_macro = 0;
          dirtmp->c_system_include_path = 1;
          dirtmp->fname = (char *) xmalloc (strlen (argv[i+1]) + 1);
          strcpy (dirtmp->fname, argv[++i]);
          dirtmp->got_name_map = 0;

          if (opts->before_system == 0)
            opts->before_system = dirtmp;
          else
            opts->last_before_system->next = dirtmp;
          opts->last_before_system = dirtmp; /* Tail follows the last one */
        }
        /* Add directory to end of path for includes,
           with the default prefix at the front of its name.  */
        if (!strcmp (argv[i], "-iwithprefix")) {
          struct file_name_list *dirtmp;
          char *prefix;

          if (opts->include_prefix != 0)
            prefix = opts->include_prefix;
          else {
            prefix = savestring (GCC_INCLUDE_DIR);
            /* Remove the `include' from /usr/local/lib/gcc.../include.  */
            if (!strcmp (prefix + strlen (prefix) - 8, "/include"))
              prefix[strlen (prefix) - 7] = 0;
          }

          dirtmp = (struct file_name_list *)
            xmalloc (sizeof (struct file_name_list));
          dirtmp->next = 0;     /* New one goes on the end */
          dirtmp->control_macro = 0;
          dirtmp->c_system_include_path = 0;
          if (i + 1 == argc)
            goto missing_dirname;

          dirtmp->fname = (char *) xmalloc (strlen (argv[i+1])
                                            + strlen (prefix) + 1);
          strcpy (dirtmp->fname, prefix);
          strcat (dirtmp->fname, argv[++i]);
          dirtmp->got_name_map = 0;

          if (opts->after_include == 0)
            opts->after_include = dirtmp;
          else
            opts->last_after_include->next = dirtmp;
          opts->last_after_include = dirtmp; /* Tail follows the last one */
        }
        /* Add directory to main path for includes,
           with the default prefix at the front of its name.  */
        if (!strcmp (argv[i], "-iwithprefixbefore")) {
          struct file_name_list *dirtmp;
          char *prefix;

          if (opts->include_prefix != 0)
            prefix = opts->include_prefix;
          else {
            prefix = savestring (GCC_INCLUDE_DIR);
            /* Remove the `include' from /usr/local/lib/gcc.../include.  */
            if (!strcmp (prefix + strlen (prefix) - 8, "/include"))
              prefix[strlen (prefix) - 7] = 0;
          }

          dirtmp = (struct file_name_list *)
            xmalloc (sizeof (struct file_name_list));
          dirtmp->next = 0;     /* New one goes on the end */
          dirtmp->control_macro = 0;
          dirtmp->c_system_include_path = 0;
          if (i + 1 == argc)
            goto missing_dirname;

          dirtmp->fname = (char *) xmalloc (strlen (argv[i+1])
                                            + strlen (prefix) + 1);
          strcpy (dirtmp->fname, prefix);
          strcat (dirtmp->fname, argv[++i]);
          dirtmp->got_name_map = 0;

          append_include_chain (pfile, dirtmp, dirtmp);
        }
        /* Add directory to end of path for includes.  */
        if (!strcmp (argv[i], "-idirafter")) {
          struct file_name_list *dirtmp;

          dirtmp = (struct file_name_list *)
            xmalloc (sizeof (struct file_name_list));
          dirtmp->next = 0;     /* New one goes on the end */
          dirtmp->control_macro = 0;
          dirtmp->c_system_include_path = 0;
          if (i + 1 == argc)
            goto missing_dirname;
          else
            dirtmp->fname = argv[++i];
          dirtmp->got_name_map = 0;

          if (opts->after_include == 0)
            opts->after_include = dirtmp;
          else
            opts->last_after_include->next = dirtmp;
          opts->last_after_include = dirtmp; /* Tail follows the last one */
        }
        break;

      case 'o':
        if (opts->out_fname != NULL)
          {
            cpp_fatal (pfile, "Output filename specified twice");
            return argc;
          }
        if (i + 1 == argc)
          goto missing_filename;
        opts->out_fname = argv[++i];
        if (!strcmp (opts->out_fname, "-"))
          opts->out_fname = "";
        break;

      case 'p':
        if (!strcmp (argv[i], "-pedantic"))
          CPP_PEDANTIC (pfile) = 1;
        else if (!strcmp (argv[i], "-pedantic-errors")) {
          CPP_PEDANTIC (pfile) = 1;
          opts->pedantic_errors = 1;
        }
#if 0
        else if (!strcmp (argv[i], "-pcp")) {
          char *pcp_fname = argv[++i];
          pcp_outfile = ((pcp_fname[0] != '-' || pcp_fname[1] != '\0')
                         ? fopen (pcp_fname, "w")
                         : fdopen (dup (fileno (stdout)), "w"));
          if (pcp_outfile == 0)
            cpp_pfatal_with_name (pfile, pcp_fname);
          no_precomp = 1;
        }
#endif
        break;

      case 't':
        if (!strcmp (argv[i], "-traditional")) {
          opts->traditional = 1;
        } else if (!strcmp (argv[i], "-trigraphs")) {
          if (!opts->chill)
            opts->no_trigraphs = 0;
        }
        break;

      case 'l':
        if (! strcmp (argv[i], "-lang-c"))
          opts->cplusplus = 0, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->objc = 0;
        if (! strcmp (argv[i], "-lang-c89"))
          opts->cplusplus = 0, opts->cplusplus_comments = 0, opts->c89 = 1,
          opts->objc = 0;
        if (! strcmp (argv[i], "-lang-c++"))
          opts->cplusplus = 1, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->objc = 0;
        if (! strcmp (argv[i], "-lang-objc"))
          opts->cplusplus = 0, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->objc = 1;
        if (! strcmp (argv[i], "-lang-objc++"))
          opts->cplusplus = 1, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->objc = 1;
        if (! strcmp (argv[i], "-lang-asm"))
          opts->lang_asm = 1;
        if (! strcmp (argv[i], "-lint"))
          opts->for_lint = 1;
        if (! strcmp (argv[i], "-lang-chill"))
          opts->objc = 0, opts->cplusplus = 0, opts->chill = 1,
          opts->traditional = 1, opts->no_trigraphs = 1;
        break;

      case '+':
        opts->cplusplus = 1, opts->cplusplus_comments = 1;
        break;

      case 'w':
        opts->inhibit_warnings = 1;
        break;

      case 'W':
        if (!strcmp (argv[i], "-Wtrigraphs"))
          opts->warn_trigraphs = 1;
        else if (!strcmp (argv[i], "-Wno-trigraphs"))
          opts->warn_trigraphs = 0;
        else if (!strcmp (argv[i], "-Wcomment"))
          opts->warn_comments = 1;
        else if (!strcmp (argv[i], "-Wno-comment"))
          opts->warn_comments = 0;
        else if (!strcmp (argv[i], "-Wcomments"))
          opts->warn_comments = 1;
        else if (!strcmp (argv[i], "-Wno-comments"))
          opts->warn_comments = 0;
        else if (!strcmp (argv[i], "-Wtraditional"))
          opts->warn_stringify = 1;
        else if (!strcmp (argv[i], "-Wno-traditional"))
          opts->warn_stringify = 0;
        else if (!strcmp (argv[i], "-Wundef"))
          opts->warn_undef = 1;
        else if (!strcmp (argv[i], "-Wno-undef"))
          opts->warn_undef = 0;
        else if (!strcmp (argv[i], "-Wimport"))
          opts->warn_import = 1;
        else if (!strcmp (argv[i], "-Wno-import"))
          opts->warn_import = 0;
        else if (!strcmp (argv[i], "-Werror"))
          opts->warnings_are_errors = 1;
        else if (!strcmp (argv[i], "-Wno-error"))
          opts->warnings_are_errors = 0;
        else if (!strcmp (argv[i], "-Wall"))
          {
            opts->warn_trigraphs = 1;
            opts->warn_comments = 1;
          }
        break;

      case 'M':
        /* The style of the choices here is a bit mixed.
           The chosen scheme is a hybrid of keeping all options in one string
           and specifying each option in a separate argument:
           -M|-MM|-MD file|-MMD file [-MG].  An alternative is:
           -M|-MM|-MD file|-MMD file|-MG|-MMG; or more concisely:
           -M[M][G][D file].  This is awkward to handle in specs, and is not
           as extensible.  */
        /* ??? -MG must be specified in addition to one of -M or -MM.
           This can be relaxed in the future without breaking anything.
           The converse isn't true.  */

        /* -MG isn't valid with -MD or -MMD.  This is checked for later.  */
        if (!strcmp (argv[i], "-MG"))
          {
            opts->print_deps_missing_files = 1;
            break;
          }
        if (!strcmp (argv[i], "-M"))
          opts->print_deps = 2;
        else if (!strcmp (argv[i], "-MM"))
          opts->print_deps = 1;
        else if (!strcmp (argv[i], "-MD"))
          opts->print_deps = 2;
        else if (!strcmp (argv[i], "-MMD"))
          opts->print_deps = 1;
        /* For -MD and -MMD options, write deps on file named by next arg.  */
        if (!strcmp (argv[i], "-MD") || !strcmp (argv[i], "-MMD"))
          {
            if (i+1 == argc)
              goto missing_filename;
            opts->deps_file = argv[++i];
          }
        else
          {
            /* For -M and -MM, write deps on standard output
               and suppress the usual output.  */
            opts->no_output = 1;
          }       
        break;

      case 'd':
        {
          char *p = argv[i] + 2;
          char c;
          while ((c = *p++) != 0) {
            /* Arg to -d specifies what parts of macros to dump */
            switch (c) {
            case 'M':
              opts->dump_macros = dump_only;
              opts->no_output = 1;
              break;
            case 'N':
              opts->dump_macros = dump_names;
              break;
            case 'D':
              opts->dump_macros = dump_definitions;
              break;
            case 'I':
              opts->dump_includes = 1;
              break;
            }
          }
        }
        break;

      case 'g':
        if (argv[i][2] == '3')
          opts->debug_output = 1;
        break;

      case 'v':
        fprintf (stderr, "GNU CPP version %s", version_string);
#ifdef TARGET_VERSION
        TARGET_VERSION;
#endif
        fprintf (stderr, "\n");
        opts->verbose = 1;
        break;

      case 'H':
        opts->print_include_names = 1;
        break;

      case 'D':
        if (argv[i][2] != 0)
          push_pending (pfile, "-D", argv[i] + 2);
        else if (i + 1 == argc)
          {
            cpp_fatal (pfile, "Macro name missing after -D option");
            return argc;
          }
        else
          i++, push_pending (pfile, "-D", argv[i]);
        break;

      case 'A':
        {
          char *p;

          if (argv[i][2] != 0)
            p = argv[i] + 2;
          else if (i + 1 == argc)
            {
              cpp_fatal (pfile, "Assertion missing after -A option");
              return argc;
            }
          else
            p = argv[++i];

          if (!strcmp (p, "-")) {
            struct cpp_pending **ptr;
            /* -A- eliminates all predefined macros and assertions.
               Let's include also any that were specified earlier
               on the command line.  That way we can get rid of any
               that were passed automatically in from GCC.  */
            opts->inhibit_predefs = 1;
            for (ptr = &opts->pending; *ptr != NULL; )
              {
                struct cpp_pending *pend = *ptr;
                if (pend->cmd && pend->cmd[0] == '-'
                    && (pend->cmd[1] == 'D' || pend->cmd[1] == 'A'))
                  {
                    *ptr = pend->next;
                    free (pend);
                  }
                else
                  ptr = &pend->next;
              }
          } else {
            push_pending (pfile, "-A", p);
          }
        }
        break;

      case 'U':         /* JF #undef something */
        if (argv[i][2] != 0)
          push_pending (pfile, "-U", argv[i] + 2);
        else if (i + 1 == argc)
          {
            cpp_fatal (pfile, "Macro name missing after -U option", NULL);
            return argc;
          }
        else
          push_pending (pfile, "-U", argv[i+1]), i++;
        break;

      case 'C':
        opts->put_out_comments = 1;
        break;

      case 'E':                 /* -E comes from cc -E; ignore it.  */
        break;

      case 'P':
        opts->no_line_commands = 1;
        break;

      case '$':                 /* Don't include $ in identifiers.  */
        opts->dollars_in_ident = 0;
        break;

      case 'I':                 /* Add directory to path for includes.  */
        {
          struct file_name_list *dirtmp;

          if (! CPP_OPTIONS(pfile)->ignore_srcdir
              && !strcmp (argv[i] + 2, "-")) {
            CPP_OPTIONS (pfile)->ignore_srcdir = 1;
            /* Don't use any preceding -I directories for #include <...>.  */
            CPP_OPTIONS (pfile)->first_bracket_include = 0;
          }
          else {
            dirtmp = (struct file_name_list *)
              xmalloc (sizeof (struct file_name_list));
            dirtmp->next = 0;           /* New one goes on the end */
            dirtmp->control_macro = 0;
            dirtmp->c_system_include_path = 0;
            if (argv[i][2] != 0)
              dirtmp->fname = argv[i] + 2;
            else if (i + 1 == argc)
              goto missing_dirname;
            else
              dirtmp->fname = argv[++i];
            dirtmp->got_name_map = 0;
            append_include_chain (pfile, dirtmp, dirtmp);
          }
        }
        break;

      case 'n':
        if (!strcmp (argv[i], "-nostdinc"))
          /* -nostdinc causes no default include directories.
             You must specify all include-file directories with -I.  */
          opts->no_standard_includes = 1;
        else if (!strcmp (argv[i], "-nostdinc++"))
          /* -nostdinc++ causes no default C++-specific include directories. */
          opts->no_standard_cplusplus_includes = 1;
#if 0
        else if (!strcmp (argv[i], "-noprecomp"))
          no_precomp = 1;
#endif
        break;

      case 'r':
        if (!strcmp (argv[i], "-remap"))
          opts->remap = 1;
        break;

      case 'u':
        /* Sun compiler passes undocumented switch "-undef".
           Let's assume it means to inhibit the predefined symbols.  */
        opts->inhibit_predefs = 1;
        break;

      case '\0': /* JF handle '-' as file name meaning stdin or stdout */
        if (opts->in_fname == NULL) {
          opts->in_fname = "";
          break;
        } else if (opts->out_fname == NULL) {
          opts->out_fname = "";
          break;
        }       /* else fall through into error */

      default:
        return i;
      }
    }
  }
  return i;
}
\f
void
cpp_finish (pfile)
     cpp_reader *pfile;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  
  if (opts->print_deps)
    {
      /* Stream on which to print the dependency information.  */
      FILE *deps_stream;

      /* Don't actually write the deps file if compilation has failed.  */
      if (pfile->errors == 0)
        {
          char *deps_mode = opts->print_deps_append ? "a" : "w";
          if (opts->deps_file == 0)
            deps_stream = stdout;
          else if ((deps_stream = fopen (opts->deps_file, deps_mode)) == 0)
            cpp_pfatal_with_name (pfile, opts->deps_file);
          fputs (pfile->deps_buffer, deps_stream);
          putc ('\n', deps_stream);
          if (opts->deps_file)
            {
              if (ferror (deps_stream) || fclose (deps_stream) != 0)
                cpp_fatal (pfile, "I/O error on output");
            }
        }
    }
}

/* Free resources used by PFILE.
   This is the cpp_reader 'finalizer' or 'destructor' (in C++ terminology).  */

void
cpp_cleanup (pfile)
     cpp_reader *pfile;
{
  int i;
  while ( CPP_BUFFER (pfile) != CPP_NULL_BUFFER (pfile))
    cpp_pop_buffer (pfile);

  if (pfile->token_buffer)
    {
      free (pfile->token_buffer);
      pfile->token_buffer = NULL;
    }

  if (pfile->deps_buffer)
    {
      free (pfile->deps_buffer);
      pfile->deps_buffer = NULL;
      pfile->deps_allocated_size = 0;
    }

  while (pfile->if_stack)
    {
      IF_STACK_FRAME *temp = pfile->if_stack;
      pfile->if_stack = temp->next;
      free (temp);
    }

  while (pfile->dont_repeat_files)
    {
      struct file_name_list *temp = pfile->dont_repeat_files;
      pfile->dont_repeat_files = temp->next;
      free (temp->fname);
      free (temp);
    }

  while (pfile->all_include_files)
    {
      struct file_name_list *temp = pfile->all_include_files;
      pfile->all_include_files = temp->next;
      free (temp->fname);
      free (temp);
    }

  for (i = IMPORT_HASH_SIZE; --i >= 0; )
    {
      register struct import_file *imp = pfile->import_hash_table[i];
      while (imp)
        {
          struct import_file *next = imp->next;
          free (imp->name);
          free (imp);
          imp = next;
        }
      pfile->import_hash_table[i] = 0;
    }

  for (i = ASSERTION_HASHSIZE; --i >= 0; )
    {
      while (pfile->assertion_hashtab[i])
        delete_assertion (pfile->assertion_hashtab[i]);
    }

  cpp_hash_cleanup (pfile);
}
\f
static int
do_assert (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  long symstart;                /* remember where symbol name starts */
  int c;
  int sym_length;               /* and how long it is */
  struct arglist *tokens = NULL;

  if (CPP_PEDANTIC (pfile) && CPP_OPTIONS (pfile)->done_initializing
      && !CPP_BUFFER (pfile)->system_header_p)
    cpp_pedwarn (pfile, "ANSI C does not allow `#assert'");

  cpp_skip_hspace (pfile);
  symstart = CPP_WRITTEN (pfile);       /* remember where it starts */
  parse_name (pfile, GETC());
  sym_length = check_macro_name (pfile, pfile->token_buffer + symstart,
                                 "assertion");

  cpp_skip_hspace (pfile);
  if (PEEKC() != '(') {
    cpp_error (pfile, "missing token-sequence in `#assert'");
    goto error;
  }

  {
    int error_flag = 0;
    tokens = read_token_list (pfile, &error_flag);
    if (error_flag)
      goto error;
    if (tokens == 0) {
      cpp_error (pfile, "empty token-sequence in `#assert'");
      goto error;
    }
  cpp_skip_hspace (pfile);
  c = PEEKC ();
  if (c != EOF && c != '\n')
      cpp_pedwarn (pfile, "junk at end of `#assert'");
  skip_rest_of_line (pfile);
  }

  /* If this name isn't already an assertion name, make it one.
     Error if it was already in use in some other way.  */

  {
    ASSERTION_HASHNODE *hp;
    U_CHAR *symname = pfile->token_buffer + symstart;
    int hashcode = hashf (symname, sym_length, ASSERTION_HASHSIZE);
    struct tokenlist_list *value
      = (struct tokenlist_list *) xmalloc (sizeof (struct tokenlist_list));

    hp = assertion_lookup (pfile, symname, sym_length, hashcode);
    if (hp == NULL) {
      if (sym_length == 7 && ! strncmp (symname, "defined", sym_length))
        cpp_error (pfile, "`defined' redefined as assertion");
      hp = assertion_install (pfile, symname, sym_length, hashcode);
    }

    /* Add the spec'd token-sequence to the list of such.  */
    value->tokens = tokens;
    value->next = hp->value;
    hp->value = value;
  }
  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
  return 0;
 error:
  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
  skip_rest_of_line (pfile);
  return 1;
}
\f
static int
do_unassert (pfile, keyword, buf, limit)
     cpp_reader *pfile;
     struct directive *keyword;
     U_CHAR *buf, *limit;
{
  long symstart;                /* remember where symbol name starts */
  int sym_length;       /* and how long it is */
  int c;

  struct arglist *tokens = NULL;
  int tokens_specified = 0;

  if (CPP_PEDANTIC (pfile) && CPP_OPTIONS (pfile)->done_initializing
      && !CPP_BUFFER (pfile)->system_header_p)
    cpp_pedwarn (pfile, "ANSI C does not allow `#unassert'");

  cpp_skip_hspace (pfile);

  symstart = CPP_WRITTEN (pfile);       /* remember where it starts */
  parse_name (pfile, GETC());
  sym_length = check_macro_name (pfile, pfile->token_buffer + symstart,
                                 "assertion");

  cpp_skip_hspace (pfile);
  if (PEEKC() == '(') {
    int error_flag = 0;

    tokens = read_token_list (pfile, &error_flag);
    if (error_flag)
      goto error;
    if (tokens == 0) {
      cpp_error (pfile, "empty token list in `#unassert'");
      goto error;
    }

    tokens_specified = 1;
  }

  cpp_skip_hspace (pfile);
  c = PEEKC ();
  if (c != EOF && c != '\n')
      cpp_error (pfile, "junk at end of `#unassert'");
  skip_rest_of_line (pfile);

  {
    ASSERTION_HASHNODE *hp;
    U_CHAR *symname = pfile->token_buffer + symstart;
    int hashcode = hashf (symname, sym_length, ASSERTION_HASHSIZE);
    struct tokenlist_list *tail, *prev;

    hp = assertion_lookup (pfile, symname, sym_length, hashcode);
    if (hp == NULL)
      return 1;

    /* If no token list was specified, then eliminate this assertion
       entirely.  */
    if (! tokens_specified)
      delete_assertion (hp);
    else {
      /* If a list of tokens was given, then delete any matching list.  */

      tail = hp->value;
      prev = 0;
      while (tail) {
        struct tokenlist_list *next = tail->next;
        if (compare_token_lists (tail->tokens, tokens)) {
          if (prev)
            prev->next = next;
          else
            hp->value = tail->next;
          free_token_list (tail->tokens);
          free (tail);
        } else {
          prev = tail;
        }
        tail = next;
      }
    }
  }

  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
  return 0;
 error:
  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
  skip_rest_of_line (pfile);
  return 1;
}
\f
/* Test whether there is an assertion named NAME
   and optionally whether it has an asserted token list TOKENS.
   NAME is not null terminated; its length is SYM_LENGTH.
   If TOKENS_SPECIFIED is 0, then don't check for any token list.  */

int
check_assertion (pfile, name, sym_length, tokens_specified, tokens)
     cpp_reader *pfile;
     U_CHAR *name;
     int sym_length;
     int tokens_specified;
     struct arglist *tokens;
{
  ASSERTION_HASHNODE *hp;
  int hashcode = hashf (name, sym_length, ASSERTION_HASHSIZE);

  if (CPP_PEDANTIC (pfile) && !CPP_BUFFER (pfile)->system_header_p)
    cpp_pedwarn (pfile, "ANSI C does not allow testing assertions");

  hp = assertion_lookup (pfile, name, sym_length, hashcode);
  if (hp == NULL)
    /* It is not an assertion; just return false.  */
    return 0;

  /* If no token list was specified, then value is 1.  */
  if (! tokens_specified)
    return 1;

  {
    struct tokenlist_list *tail;

    tail = hp->value;

    /* If a list of tokens was given,
       then succeed if the assertion records a matching list.  */

    while (tail) {
      if (compare_token_lists (tail->tokens, tokens))
        return 1;
      tail = tail->next;
    }

    /* Fail if the assertion has no matching list.  */
    return 0;
  }
}

/* Compare two lists of tokens for equality including order of tokens.  */

static int
compare_token_lists (l1, l2)
     struct arglist *l1, *l2;
{
  while (l1 && l2) {
    if (l1->length != l2->length)
      return 0;
    if (strncmp (l1->name, l2->name, l1->length))
      return 0;
    l1 = l1->next;
    l2 = l2->next;
  }

  /* Succeed if both lists end at the same time.  */
  return l1 == l2;
}
\f
struct arglist *
reverse_token_list (tokens)
     struct arglist *tokens;
{
  register struct arglist *prev = 0, *this, *next;
  for (this = tokens; this; this = next)
    {
      next = this->next;
      this->next = prev;
      prev = this;
    }
  return prev;
}

/* Read a space-separated list of tokens ending in a close parenthesis.
   Return a list of strings, in the order they were written.
   (In case of error, return 0 and store -1 in *ERROR_FLAG.) */

static struct arglist *
read_token_list (pfile, error_flag)
     cpp_reader *pfile;
     int *error_flag;
{
  struct arglist *token_ptrs = 0;
  int depth = 1;
  int length;

  *error_flag = 0;
  FORWARD (1);  /* Skip '(' */

  /* Loop over the assertion value tokens.  */
  while (depth > 0)
    {
      struct arglist *temp;
      long name_written = CPP_WRITTEN (pfile);
      int c;

      cpp_skip_hspace (pfile);

      c = GETC ();
          
      /* Find the end of the token.  */
      if (c == '(')
        {
          CPP_PUTC (pfile, c);
          depth++;
        }
      else if (c == ')')
        {
          depth--;
          if (depth == 0)
            break;
          CPP_PUTC (pfile, c);
        }
      else if (c == '"' || c == '\'')
        {
          FORWARD(-1);
          cpp_get_token (pfile);
        }
      else if (c == '\n')
        break;
      else
        {
          while (c != EOF && ! is_space[c] && c != '(' && c != ')'
                 && c != '"' && c != '\'')
            {
              CPP_PUTC (pfile, c);
              c = GETC();
            }
          if (c != EOF)  FORWARD(-1);
        }

      length = CPP_WRITTEN (pfile) - name_written;
      temp = (struct arglist *)
          xmalloc (sizeof (struct arglist) + length + 1);
      temp->name = (U_CHAR *) (temp + 1);
      bcopy ((char *) (pfile->token_buffer + name_written),
             (char *) temp->name, length);
      temp->name[length] = 0;
      temp->next = token_ptrs;
      token_ptrs = temp;
      temp->length = length;

      CPP_ADJUST_WRITTEN (pfile, -length); /* pop */

      if (c == EOF || c == '\n')
        { /* FIXME */
          cpp_error (pfile,
                     "unterminated token sequence following  `#' operator");
          return 0;
        }
    }

  /* We accumulated the names in reverse order.
     Now reverse them to get the proper order.  */
  return reverse_token_list (token_ptrs);
}

static void
free_token_list (tokens)
     struct arglist *tokens;
{
  while (tokens) {
    struct arglist *next = tokens->next;
    free (tokens->name);
    free (tokens);
    tokens = next;
  }
}
\f
/* Read LEN bytes at PTR from descriptor DESC, for file FILENAME,
   retrying if necessary.  If MAX_READ_LEN is defined, read at most
   that bytes at a time.  Return a negative value if an error occurs,
   otherwise return the actual number of bytes read,
   which must be LEN unless end-of-file was reached.  */

static int
safe_read (desc, ptr, len)
     int desc;
     char *ptr;
     int len;
{
  int left, rcount, nchars;

  left = len;
  while (left > 0) {
    rcount = left;
#ifdef MAX_READ_LEN
    if (rcount > MAX_READ_LEN)
      rcount = MAX_READ_LEN;
#endif
    nchars = read (desc, ptr, rcount);
    if (nchars < 0)
      {
#ifdef EINTR
        if (errno == EINTR)
          continue;
#endif
        return nchars;
      }
    if (nchars == 0)
      break;
    ptr += nchars;
    left -= nchars;
  }
  return len - left;
}

static char *
xcalloc (number, size)
     unsigned number, size;
{
  register unsigned total = number * size;
  register char *ptr = (char *) xmalloc (total);
  bzero (ptr, total);
  return ptr;
}

static char *
savestring (input)
     char *input;
{
  unsigned size = strlen (input);
  char *output = xmalloc (size + 1);
  strcpy (output, input);
  return output;
}
\f
/* Initialize PMARK to remember the current position of PFILE.  */

void
parse_set_mark (pmark, pfile)
     struct parse_marker *pmark;
     cpp_reader *pfile;
{
  cpp_buffer *pbuf = CPP_BUFFER (pfile);
  pmark->next = pbuf->marks;
  pbuf->marks = pmark;
  pmark->buf = pbuf;
  pmark->position = pbuf->cur - pbuf->buf;
}

/* Cleanup PMARK - we no longer need it.  */

void
parse_clear_mark (pmark)
     struct parse_marker *pmark;
{
  struct parse_marker **pp = &pmark->buf->marks;
  for (; ; pp = &(*pp)->next) {
    if (*pp == NULL) abort ();
    if (*pp == pmark) break;
  }
  *pp = pmark->next;
}

/* Backup the current position of PFILE to that saved in PMARK.  */

void
parse_goto_mark (pmark, pfile)
     struct parse_marker *pmark;
     cpp_reader *pfile;
{
  cpp_buffer *pbuf = CPP_BUFFER (pfile);
  if (pbuf != pmark->buf)
    cpp_fatal (pfile, "internal error %s", "parse_goto_mark");
  pbuf->cur = pbuf->buf + pmark->position;
}

/* Reset PMARK to point to the current position of PFILE.  (Same
   as parse_clear_mark (PMARK), parse_set_mark (PMARK, PFILE) but faster.  */

void
parse_move_mark (pmark, pfile)
     struct parse_marker *pmark;
     cpp_reader *pfile;
{
  cpp_buffer *pbuf = CPP_BUFFER (pfile);
  if (pbuf != pmark->buf)
    cpp_fatal (pfile, "internal error %s", "parse_move_mark");
  pmark->position = pbuf->cur - pbuf->buf;
}

int
cpp_read_check_assertion (pfile)
     cpp_reader *pfile;
{
  int name_start = CPP_WRITTEN (pfile);
  int name_length, name_written;
  int result;
  FORWARD (1);  /* Skip '#' */
  cpp_skip_hspace (pfile);
  parse_name (pfile, GETC ());
  name_written = CPP_WRITTEN (pfile);
  name_length = name_written - name_start;
  cpp_skip_hspace (pfile);
  if (CPP_BUF_PEEK (CPP_BUFFER (pfile)) == '(')
    {
      int error_flag;
      struct arglist *token_ptrs = read_token_list (pfile, &error_flag);
      result = check_assertion (pfile,
                                pfile->token_buffer + name_start, name_length,
                                1, token_ptrs);
    }
  else
    result = check_assertion (pfile,
                              pfile->token_buffer + name_start, name_length,
                              0, NULL_PTR);
  CPP_ADJUST_WRITTEN (pfile, - name_length);  /* pop */
  return result;
}
\f
void
cpp_print_file_and_line (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *ip = cpp_file_buffer (pfile);

  if (ip != NULL)
    {
      long line, col;
      cpp_buf_line_and_col (ip, &line, &col);
      cpp_file_line_for_message (pfile, ip->nominal_fname,
                                 line, pfile->show_column ? col : -1);
    }
}

void
cpp_error (pfile, msg, arg1, arg2, arg3)
     cpp_reader *pfile;
     char *msg;
     char *arg1, *arg2, *arg3;
{
  cpp_print_containing_files (pfile);
  cpp_print_file_and_line (pfile);
  cpp_message (pfile, 1, msg, arg1, arg2, arg3);
}

/* Print error message but don't count it.  */

void
cpp_warning (pfile, msg, arg1, arg2, arg3)
     cpp_reader *pfile;
     char *msg;
     char *arg1, *arg2, *arg3;
{
  if (CPP_OPTIONS (pfile)->inhibit_warnings)
    return;

  if (CPP_OPTIONS (pfile)->warnings_are_errors)
    pfile->errors++;

  cpp_print_containing_files (pfile);
  cpp_print_file_and_line (pfile);
  cpp_message (pfile, 0, msg, arg1, arg2, arg3);
}

/* Print an error message and maybe count it.  */

void
cpp_pedwarn (pfile, msg, arg1, arg2, arg3)
     cpp_reader *pfile;
     char *msg;
     char *arg1, *arg2, *arg3;
{
  if (CPP_OPTIONS (pfile)->pedantic_errors)
    cpp_error (pfile, msg, arg1, arg2, arg3);
  else
    cpp_warning (pfile, msg, arg1, arg2, arg3);
}

void
cpp_error_with_line (pfile, line, column, msg, arg1, arg2, arg3)
     cpp_reader *pfile;
     int line, column;
     char *msg;
     char *arg1, *arg2, *arg3;
{
  cpp_buffer *ip = cpp_file_buffer (pfile);

  cpp_print_containing_files (pfile);

  if (ip != NULL)
    cpp_file_line_for_message (pfile, ip->nominal_fname, line, column);

  cpp_message (pfile, 1, msg, arg1, arg2, arg3);
}

static void
cpp_warning_with_line (pfile, line, column, msg, arg1, arg2, arg3)
     cpp_reader *pfile;
     int line, column;
     char *msg;
     char *arg1, *arg2, *arg3;
{
  cpp_buffer *ip;

  if (CPP_OPTIONS (pfile)->inhibit_warnings)
    return;

  if (CPP_OPTIONS (pfile)->warnings_are_errors)
    pfile->errors++;

  cpp_print_containing_files (pfile);

  ip = cpp_file_buffer (pfile);

  if (ip != NULL)
    cpp_file_line_for_message (pfile, ip->nominal_fname, line, column);

  cpp_message (pfile, 0, msg, arg1, arg2, arg3);
}

void
cpp_pedwarn_with_line (pfile, line, column, msg, arg1, arg2, arg3)
     cpp_reader *pfile;
     int line, column;
     char *msg;
     char *arg1, *arg2, *arg3;
{
  if (CPP_OPTIONS (pfile)->pedantic_errors)
    cpp_error_with_line (pfile, column, line, msg, arg1, arg2, arg3);
  else
    cpp_warning_with_line (pfile, line, column, msg, arg1, arg2, arg3);
}

/* Report a warning (or an error if pedantic_errors)
   giving specified file name and line number, not current.  */

void
cpp_pedwarn_with_file_and_line (pfile, file, line, msg, arg1, arg2, arg3)
     cpp_reader *pfile;
     char *file;
     int line;
     char *msg;
     char *arg1, *arg2, *arg3;
{
  if (!CPP_OPTIONS (pfile)->pedantic_errors
      && CPP_OPTIONS (pfile)->inhibit_warnings)
    return;
  if (file != NULL)
    cpp_file_line_for_message (pfile, file, line, -1);
  cpp_message (pfile, CPP_OPTIONS (pfile)->pedantic_errors,
               msg, arg1, arg2, arg3);
}

/* This defines "errno" properly for VMS, and gives us EACCES.  */
#include <errno.h>
#ifndef errno
extern int errno;
#endif

#ifndef VMS
#ifndef HAVE_STRERROR
extern int sys_nerr;
extern char *sys_errlist[];
#else   /* HAVE_STRERROR */
char *strerror ();
#endif
#else   /* VMS */
char *strerror (int,...);
#endif

/* my_strerror - return the descriptive text associated with an
   `errno' code.  */

char *
my_strerror (errnum)
     int errnum;
{
  char *result;

#ifndef VMS
#ifndef HAVE_STRERROR
  result = (char *) ((errnum < sys_nerr) ? sys_errlist[errnum] : 0);
#else
  result = strerror (errnum);
#endif
#else   /* VMS */
  /* VAXCRTL's strerror() takes an optional second argument, which only
     matters when the first argument is EVMSERR.  However, it's simplest
     just to pass it unconditionally.  `vaxc$errno' is declared in
     <errno.h>, and maintained by the library in parallel with `errno'.
     We assume that caller's `errnum' either matches the last setting of
     `errno' by the library or else does not have the value `EVMSERR'.  */

  result = strerror (errnum, vaxc$errno);
#endif

  if (!result)
    result = "undocumented I/O error";

  return result;
}

/* Error including a message from `errno'.  */

void
cpp_error_from_errno (pfile, name)
     cpp_reader *pfile;
     char *name;
{
  cpp_buffer *ip = cpp_file_buffer (pfile);

  cpp_print_containing_files (pfile);

  if (ip != NULL)
    cpp_file_line_for_message (pfile, ip->nominal_fname, ip->lineno, -1);

  cpp_message (pfile, 1, "%s: %s", name, my_strerror (errno));
}

void
cpp_perror_with_name (pfile, name)
     cpp_reader *pfile;
     char *name;
{
  cpp_message (pfile, 1, "%s: %s: %s", progname, name, my_strerror (errno));
}

/* TODO:
 * No pre-compiled header file support.
 *
 * Possibly different enum token codes for each C/C++ token.
 *
 * Should clean up remaining directives to that do_XXX functions
 *   only take two arguments and all have command_reads_line.
 *
 * Find and cleanup remaining uses of static variables,
 *
 * Support for trigraphs.
 *
 * Support -dM flag (dump_all_macros).
 *
 * Support for_lint flag.
 */