--with-gnu-ld uses different x- fiile under aix 4.1

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

/* CPP Library.
   Copyright (C) 1986, 87, 89, 92-98, 1999 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"
#include "system.h"

#ifndef STDC_VALUE
#define STDC_VALUE 1
#endif

#include <signal.h>

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

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

#include "cpplib.h"
#include "cpphash.h"
#include "output.h"
#include "prefix.h"

#ifndef GET_ENV_PATH_LIST
#define GET_ENV_PATH_LIST(VAR,NAME)     do { (VAR) = getenv (NAME); } while (0)
#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

/* 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
#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.  */

extern void cpp_hash_cleanup PARAMS ((cpp_reader *));

static char *my_strerror                PROTO ((int));
static void make_assertion              PROTO ((cpp_reader *, char *, U_CHAR *));
static void path_include                PROTO ((cpp_reader *, char *));
static void initialize_builtins         PROTO ((cpp_reader *));
static void initialize_char_syntax      PROTO ((void));
#if 0
static void trigraph_pcp ();
#endif
static void validate_else               PROTO ((cpp_reader *, char *));
static int comp_def_part                PROTO ((int, U_CHAR *, int, U_CHAR *,
                                                int, int));
#ifdef abort
extern void fancy_abort ();
#endif
static int check_macro_name             PROTO ((cpp_reader *, U_CHAR *, char *));
static int compare_defs                 PROTO ((cpp_reader *,
                                                DEFINITION *, DEFINITION *));
static HOST_WIDE_INT eval_if_expression PROTO ((cpp_reader *));
static int change_newlines              PROTO ((U_CHAR *, int));
static void push_macro_expansion PARAMS ((cpp_reader *,
                                          U_CHAR *, int, HASHNODE *));
static struct cpp_pending *nreverse_pending PARAMS ((struct cpp_pending *));

static void conditional_skip            PROTO ((cpp_reader *, int,
                                                enum node_type, U_CHAR *));
static void skip_if_group               PROTO ((cpp_reader *));
static int parse_name                   PARAMS ((cpp_reader *, int));
static void print_help                  PROTO ((void));

/* 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 char *version_string;
extern struct tm *localtime ();
\f

/* #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 },
#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 */
    PARAMS ((cpp_reader *, struct directive *));
  char *name;                   /* Name of directive */
  enum node_type type;          /* Code which describes which directive.  */
};

/* 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 PARAMS ((cpp_reader *, struct directive *));
static int do_line PARAMS ((cpp_reader *, struct directive *));
static int do_include PARAMS ((cpp_reader *, struct directive *));
static int do_undef PARAMS ((cpp_reader *, struct directive *));
static int do_error PARAMS ((cpp_reader *, struct directive *));
static int do_pragma PARAMS ((cpp_reader *, struct directive *));
static int do_ident PARAMS ((cpp_reader *, struct directive *));
static int do_if PARAMS ((cpp_reader *, struct directive *));
static int do_xifdef PARAMS ((cpp_reader *, struct directive *));
static int do_else PARAMS ((cpp_reader *, struct directive *));
static int do_elif PARAMS ((cpp_reader *, struct directive *));
static int do_endif PARAMS ((cpp_reader *, struct directive *));
#ifdef SCCS_DIRECTIVE
static int do_sccs PARAMS ((cpp_reader *, struct directive *));
#endif
static int do_assert PARAMS ((cpp_reader *, struct directive *));
static int do_unassert PARAMS ((cpp_reader *, struct directive *));
static int do_warning PARAMS ((cpp_reader *, struct directive *));

#define IS_INCLUDE_DIRECTIVE_TYPE(t) \
((int) T_INCLUDE <= (int) (t) && (int) (t) <= (int) 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 },
  {  6, do_xifdef,   "ifndef",       T_IFNDEF },
  {  7, do_include,  "include",      T_INCLUDE },
  { 12, do_include,  "include_next", T_INCLUDE_NEXT },
  {  6, do_include,  "import",       T_IMPORT },
  {  5, do_endif,    "endif",        T_ENDIF },
  {  4, do_else,     "else",         T_ELSE },
  {  2, do_if,       "if",           T_IF },
  {  4, do_elif,     "elif",         T_ELIF },
  {  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 },
  {  5, do_ident,    "ident",        T_IDENT },
#ifdef SCCS_DIRECTIVE
  {  4, do_sccs,     "sccs",         T_SCCS },
#endif
  {  6, do_assert,   "assert",       T_ASSERT },
  {  8, do_unassert, "unassert",     T_UNASSERT },
  {  -1, 0, "", T_UNUSED }
};
\f
/* table to tell if char can be part of a C identifier.  */
U_CHAR is_idchar[256] = { 0 };
/* table to tell if char can be first char of a c identifier.  */
U_CHAR is_idstart[256] = { 0 };
/* table to tell if c is horizontal space.  */
U_CHAR is_hor_space[256] = { 0 };
/* table to tell if c is horizontal or vertical space.  */
U_CHAR is_space[256] = { 0 };

/* Initialize syntactic classifications of characters. */
static void
initialize_char_syntax ()
{
  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.
   * XXX We should setlocale(LC_CTYPE, "C") here for safety.
   */
  for (i = 0; i < 256; i++)
    {
      is_idchar[i]  = ISALNUM (i);
      is_idstart[i] = ISALPHA (i);
    }

  is_idchar['_']  = 1;
  is_idstart['_'] = 1;

  /* These will be reset later if -$ is in effect. */
  is_idchar['$']  = 1;
  is_idstart['$'] = 1;

  /* 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 == '(') {
    while (is_idchar[*++p] || *p == ',' || is_hor_space[*p])
      ;
    if (*p++ != ')')
      p = (U_CHAR *) str;                       /* Error */
  }
  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;
  }
  
  if (cpp_push_buffer (pfile, buf, strlen (buf)) != NULL)
    {
      do_define (pfile, NULL);
      cpp_pop_buffer (pfile);
    }
}
\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);
      cpp_pop_buffer (pfile);
    }
}

/* 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;

      /* 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;
      }

      append_include_chain (pfile,
                            &(CPP_OPTIONS (pfile)->bracket_include), name, 0);

      /* 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;

  opts->dollars_in_ident = 1;
  initialize_char_syntax ();

  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 = 1;

  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 ATTRIBUTE_UNUSED;
{
  return CPP_EOF;
}

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

int
macro_cleanup (pbuf, pfile)
     cpp_buffer *pbuf;
     cpp_reader *pfile ATTRIBUTE_UNUSED;
{
  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;
}

/* 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;
  U_CHAR *ident;
  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;
  }

  /* 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.  */

  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);

  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.
m   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
         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 ((size_t)(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.
KEYWORD is the keyword-table entry for #define,
or NULL for a "predefined" macro.  */

static int
do_define (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword;
{
  int hashcode;
  MACRODEF mdef;
  HASHNODE *hp;
  int save_put_out_comments;
  long here;
  U_CHAR *macro, *buf, *end;

  here = CPP_WRITTEN (pfile);
  
  save_put_out_comments = CPP_OPTIONS (pfile)->put_out_comments;
  CPP_OPTIONS (pfile)->put_out_comments = CPP_TRADITIONAL (pfile);
  copy_rest_of_line (pfile);
  CPP_OPTIONS (pfile)->put_out_comments = save_put_out_comments;

  /* Copy out the line so we can pop the token buffer. */
  buf = pfile->token_buffer + here;
  end = CPP_PWRITTEN (pfile);
  macro = alloca (end - buf + 1);
  bcopy (buf, macro, end - buf + 1);
  end = macro + (end - buf);

  CPP_SET_WRITTEN (pfile, here);

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

  mdef = create_definition (macro, end, 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 (macro, end, 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 (macro, end, 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;
{
  const char *buf;
  char *wbuf;
  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++;

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

  case T_VERSION:
      wbuf = (char *) alloca (3 + strlen (version_string));
      sprintf (wbuf, "\"%s\"", version_string);
      buf = wbuf;
      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:
      wbuf = (char *) alloca (4 * sizeof (int));
      sprintf (wbuf, "%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 (wbuf, "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
      buf = wbuf;
      break;

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

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

    case T_DATE:
    case T_TIME:
      wbuf = (char *) alloca (20);
      timebuf = timestamp (pfile);
      if (hp->type == T_DATE)
        sprintf (wbuf, "\"%s %2d %4d\"", monthnames[timebuf->tm_mon],
                 timebuf->tm_mday, timebuf->tm_year + 1900);
      else
        sprintf (wbuf, "\"%02d:%02d:%02d\"", timebuf->tm_hour, timebuf->tm_min,
                 timebuf->tm_sec);
      buf = wbuf;
      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 if 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) > (unsigned)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++;
                }
              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 whitespace is preceded by an odd number
                             of `@' signs, the last `@' was a whitespace
                             marker; drop it too. */
                          while (p2 != p1 && p2[0] == '@') p2--;
                          if ((l1 - p2) & 1)
                            l1--;
                          break;
                        }
                      else if (l1[-1] == '-')
                        {
                          U_CHAR *p2 = l1 - 1;
                          /* If a `-' is preceded by an odd number of
                             `@' signs then it and the last `@' are
                             a no-reexpansion marker.  */
                          while (p2 != p1 && p2[0] == '@') p2--;
                          if ((l1 - p2) & 1)
                            l1 -= 2;
                          else
                            break;
                        }
                      else break;
                    }
                }

              /* Delete any no-reexpansion marker that precedes
                 an identifier at the beginning of the argument. */
              if (p1[0] == '@' && p1[1] == '-')
                p1 += 2;

              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)
     cpp_reader *pfile;
     struct directive *keyword;
{
  int importing = (keyword->type == T_IMPORT);
  int skip_dirs = (keyword->type == T_INCLUDE_NEXT);
  int angle_brackets = 0;       /* 0 for "...", 1 for <...> */
  int before;  /* included before? */
  long flen;
  char *fbeg, *fend;
  cpp_buffer *fp;

  enum cpp_token token;

  /* Chain of dirs to search */
  struct include_hash *ihash;
  struct file_name_list *search_start;
  
  long old_written = CPP_WRITTEN (pfile);

  int fd;

  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, "`#import' is obsolete, use an #ifdef wrapper in the header file");
    }

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

  if (token == CPP_STRING)
    {
      fbeg = pfile->token_buffer + old_written + 1;
      fend = CPP_PWRITTEN (pfile) - 1;
      *fend = '\0';
      if (fbeg[-1] == '<')
          angle_brackets = 1;
    }
#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>' and generates a warning.  */
      cpp_warning (pfile,
                   "VAX-C-style include specification found, use '#include <filename.h>' !");
      angle_brackets = 1;

      /* Append the missing `.h' to the name. */
      CPP_PUTS (pfile, ".h", 3)
      CPP_NUL_TERMINATE_Q (pfile);

      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;
    }

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

  CPP_SET_WRITTEN (pfile, old_written);

  flen = fend - fbeg;

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

  search_start = 0;

  for (fp = CPP_BUFFER (pfile);
       fp != CPP_NULL_BUFFER (pfile);
       fp = CPP_PREV_BUFFER (fp))
    if (fp->fname != NULL)
      break;

  if (fp == CPP_NULL_BUFFER (pfile))
    {
      cpp_fatal (pfile, "cpp internal error: fp == NULL_BUFFER in do_include");
      return 1;
    }
  
  /* For #include_next, skip in the search path past the dir in which the
     containing file was found.  Treat files specified using an absolute path
     as if there are no more directories to search.  Treat the primary source
     file like any other included source, but generate a warning.  */
  if (skip_dirs && CPP_PREV_BUFFER(fp) != CPP_NULL_BUFFER (pfile))
    {
      if (fp->ihash->foundhere != ABSOLUTE_PATH)
        search_start = fp->ihash->foundhere->next;
    }
  else
    {
      if (skip_dirs)
        cpp_warning (pfile, "#include_next in primary source file");
      
      if (angle_brackets)
        search_start = CPP_OPTIONS (pfile)->bracket_include;
      else
        {
          if (!CPP_OPTIONS (pfile)->ignore_srcdir)
            {
              if (fp)
                search_start = fp->actual_dir;
            }
          else
            search_start = CPP_OPTIONS (pfile)->quote_include;
        }
    }

  if (!search_start)
    {
      cpp_error (pfile, "No include path in which to find %s", fbeg);
      return 0;
    }

  fd = find_include_file (pfile, fbeg, search_start, &ihash, &before);

  if (fd == -2)
    return 0;
  
  if (fd == -1)
    {
      if (CPP_OPTIONS (pfile)->print_deps_missing_files
          && CPP_PRINT_DEPS (pfile) > (angle_brackets ||
                                       (pfile->system_include_depth > 0)))
        {
          if (!angle_brackets)
            deps_output (pfile, fbeg, ' ');
          else
            {
              char *p;
              struct file_name_list *ptr;
              /* If requested as a system header, assume it belongs in
                 the first system header directory. */
              if (CPP_OPTIONS (pfile)->bracket_include)
                ptr = CPP_OPTIONS (pfile)->bracket_include;
              else
                ptr = CPP_OPTIONS (pfile)->quote_include;

              p = (char *) alloca (strlen (ptr->name)
                                   + strlen (fbeg) + 2);
              if (*ptr->name != '\0')
                {
                  strcpy (p, ptr->name);
                  strcat (p, "/");
                }
              strcat (p, fbeg);
              deps_output (pfile, p, ' ');
            }
        }
      /* 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", fbeg);
      else
        cpp_error_from_errno (pfile, fbeg);

      return 0;
    }

  /* For -M, add the file to the dependencies on its first inclusion. */
  if (!before && (CPP_PRINT_DEPS (pfile)
                  > (angle_brackets || (pfile->system_include_depth > 0))))
    deps_output (pfile, ihash->name, ' ');

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

  /* Actually process the file */

  if (importing)
    ihash->control_macro = "";
  
  if (cpp_push_buffer (pfile, NULL, 0) == NULL)
    {
      close (fd);
      return 0;
    }
  
  if (angle_brackets)
    pfile->system_include_depth++;   /* Decremented in file_cleanup. */

  if (finclude (pfile, fd, ihash))
    {
      output_line_command (pfile, 0, enter_file);
      pfile->only_seen_white = 2;
    }

  return 0;
}

\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, 0x00ff);
              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 ATTRIBUTE_UNUSED;
{
  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)
     cpp_reader *pfile;
     struct directive *keyword;
{
  int sym_length;
  HASHNODE *hp;
  U_CHAR *buf, *name, *limit;
  int c;
  long here = CPP_WRITTEN (pfile);
  enum cpp_token token;

  cpp_skip_hspace (pfile);
  c = GETC();
  if (! is_idstart[c])
  {
      cpp_error (pfile, "token after #undef is not an identifier");
      skip_rest_of_line (pfile);
      return 1;
  }

  parse_name (pfile, c);
  buf = pfile->token_buffer + here;
  limit = CPP_PWRITTEN(pfile);

  /* Copy out the token so we can pop the token buffer. */
  name = alloca (limit - buf + 1);
  bcopy(buf, name, limit - buf);
  name[limit - buf] = '\0';

  token = get_directive_token (pfile);
  if (token != CPP_VSPACE && token != CPP_POP)
  {
      cpp_pedwarn (pfile, "junk on line after #undef");
      skip_rest_of_line (pfile);
  }

  CPP_SET_WRITTEN (pfile, here);

#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

  sym_length = check_macro_name (pfile, name, "macro");

  while ((hp = cpp_lookup (pfile, name, 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 (name, name+sym_length, pfile, keyword);
      if (hp->type != T_MACRO)
        cpp_warning (pfile, "undefining `%s'", hp->name);
      delete_macro (hp);
    }

  return 0;
}

/* Wrap do_undef for -U processing. */
static void
cpp_undef (pfile, macro)
     cpp_reader *pfile;
     U_CHAR *macro;
{
    if (cpp_push_buffer (pfile, macro, strlen(macro)))
    {
        do_undef (pfile, NULL);
        cpp_pop_buffer (pfile);
    }
}

\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)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  long here = CPP_WRITTEN (pfile);
  U_CHAR *text;
  copy_rest_of_line (pfile);
  text = pfile->token_buffer + here;
  SKIP_WHITE_SPACE(text);

  cpp_error (pfile, "#error %s", text);
  CPP_SET_WRITTEN (pfile, here);
  return 0;
}

/*
 * Report a warning detected by the program we are processing.
 * Use the text of the line in the warning message, then continue.
 */

static int
do_warning (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  U_CHAR *text;
  long here = CPP_WRITTEN(pfile);
  copy_rest_of_line (pfile);
  text = pfile->token_buffer + here;
  SKIP_WHITE_SPACE(text);

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

  /* 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", text);
  CPP_SET_WRITTEN (pfile, here);
  return 0;
}

/* Report program identification.  */

static int
do_ident (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  /* 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'");

  skip_rest_of_line (pfile);  /* Correct?  Appears to match cccp.  */

  return 0;
}

/* Just check for some recognized pragmas that need validation here,
   and leave the text in the token buffer to be output. */

static int
do_pragma (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  long here = CPP_WRITTEN (pfile);
  U_CHAR *buf;
  
  copy_rest_of_line (pfile);
  buf = pfile->token_buffer + here;
  SKIP_WHITE_SPACE (buf);
  
  if (!strncmp (buf, "once", 4))
    {
      cpp_buffer *ip = NULL;

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

      if (CPP_PREV_BUFFER (ip) == CPP_NULL_BUFFER (pfile))
        cpp_warning (pfile, "`#pragma once' outside include file");
      else
        ip->ihash->control_macro = "";  /* never repeat */
    }

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

      fname = p + 1;
      p = (U_CHAR *) index (fname, '\"');

      fcopy = alloca (p - fname + 1);
      bcopy (fname, fcopy, p - fname);
      fcopy[p-fname] = '\0';

      ptr = include_hash (pfile, fcopy, 0);
      if (ptr)
        cpp_warning (pfile,
          "`#pragma implementation' for `%s' appears after file is included",
                     fcopy);
    }

  return 0;
}

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

static int
do_sccs (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  if (CPP_PEDANTIC (pfile))
    cpp_pedwarn (pfile, "ANSI C does not allow `#sccs'");
  skip_rest_of_line (pfile);
  return 0;
}
#endif
\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)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  HOST_WIDE_INT value = eval_if_expression (pfile);
  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)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  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);
  else {
    HOST_WIDE_INT value = eval_if_expression (pfile);
    if (value == 0)
      skip_if_group (pfile);
    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)
     cpp_reader *pfile;
{
  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)
     cpp_reader *pfile;
     struct directive *keyword;
{
  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);
    return;
  } else {
    ++pfile->if_stack->if_succeeded;
    output_line_command (pfile, 1, same_file);
  }
}

/* Subroutine of skip_if_group.  Examine one preprocessing directive and
   return 0 if skipping should continue, 1 if it should halt.  Also
   adjusts the if_stack as appropriate.
   The `#' has been read, but not the identifier. */

static int
consider_directive_while_skipping (pfile, stack)
    cpp_reader *pfile;
    IF_STACK_FRAME *stack; 
{
  long ident_len, ident;
  struct directive *kt;
  IF_STACK_FRAME *temp;
    
  cpp_skip_hspace (pfile);

  ident = CPP_WRITTEN (pfile);
  parse_name (pfile, GETC());
  ident_len = CPP_WRITTEN (pfile) - ident;

  CPP_SET_WRITTEN (pfile, ident);

  for (kt = directive_table; kt->length >= 0; kt++)
    if (kt->length == ident_len
        && strncmp (pfile->token_buffer + ident, kt->name, kt->length) == 0)
      switch (kt->type)
        {
        case T_IF:
        case T_IFDEF:
        case T_IFNDEF:
            temp = (IF_STACK_FRAME *) xmalloc (sizeof (IF_STACK_FRAME));
            temp->next = pfile->if_stack;
            pfile->if_stack = temp;
            temp->fname = CPP_BUFFER(pfile)->nominal_fname;
            temp->type = kt->type;
            return 0;

        case T_ELSE:
            if (CPP_PEDANTIC (pfile) && pfile->if_stack != stack)
              validate_else (pfile, "#else");
            /* fall through */
        case T_ELIF:
            if (pfile->if_stack->type == T_ELSE)
              cpp_error (pfile, "`%s' after `#else'", kt->name);
            
            if (pfile->if_stack == stack)
              return 1;
            else
              {
                pfile->if_stack->type = kt->type;
                return 0;
              }

            case T_ENDIF:
                if (CPP_PEDANTIC (pfile) && pfile->if_stack != stack)
                  validate_else (pfile, "#endif");

                if (pfile->if_stack == stack)
                  return 1;
                    
                temp = pfile->if_stack;
                pfile->if_stack = temp->next;
                free (temp);
                return 0;

            default:
                return 0;
            }

    /* Don't let erroneous code go by.  */
    if (!CPP_OPTIONS (pfile)->lang_asm && CPP_PEDANTIC (pfile))
        cpp_pedwarn (pfile, "invalid preprocessor directive name");
    return 0;
}

/* skip to #endif, #else, or #elif.  adjust line numbers, etc.
 * leaves input ptr at the sharp sign found.
 */
static void
skip_if_group (pfile)
    cpp_reader *pfile;
{
  int c;
  IF_STACK_FRAME *save_if_stack = pfile->if_stack; /* don't pop past here */
  U_CHAR *beg_of_line;
  long old_written;

  if (CPP_OPTIONS (pfile)->output_conditionals)
    {
      CPP_PUTS (pfile, "#failed\n", 8);
      pfile->lineno++;
      output_line_command (pfile, 1, same_file);
    }

  old_written = CPP_WRITTEN (pfile);
  
  for (;;)
    {
      beg_of_line = CPP_BUFFER (pfile)->cur;

      if (! CPP_TRADITIONAL (pfile))
        cpp_skip_hspace (pfile);
      c = GETC();
      if (c == '\n')
        {
          if (CPP_OPTIONS (pfile)->output_conditionals)
            CPP_PUTC (pfile, c);
          continue;
        }
      else if (c == '#')
        {
          if (consider_directive_while_skipping (pfile, save_if_stack))
            break;
        }
      else if (c == EOF)
        return;  /* Caller will issue error. */

      FORWARD(-1);
      if (CPP_OPTIONS (pfile)->output_conditionals)
        {
          CPP_PUTS (pfile, beg_of_line, CPP_BUFFER (pfile)->cur - beg_of_line);
          copy_rest_of_line (pfile);
        }
      else
        {
          copy_rest_of_line (pfile);
          CPP_SET_WRITTEN (pfile, old_written);  /* discard it */
        }

      c = GETC();
      if (c == EOF)
        return;  /* Caller will issue error. */
      else
        {
          /* \n */
          if (CPP_OPTIONS (pfile)->output_conditionals)
            CPP_PUTC (pfile, c);
        }
    }     

  /* Back up to the beginning of this line.  Caller will process the
     directive. */
  CPP_BUFFER (pfile)->cur = beg_of_line;
  pfile->only_seen_white = 1;
  if (CPP_OPTIONS (pfile)->output_conditionals)
    {
      CPP_PUTS (pfile, "#endfailed\n", 11);
      pfile->lineno++;
    }
}

/*
 * 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)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  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);
  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)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  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)
            {
              /* 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. */
              struct cpp_buffer *ip;
              for (ip = CPP_BUFFER (pfile); ; ip = CPP_PREV_BUFFER (ip))
                if (ip->fname != NULL)
                  break;
              ip->ihash->control_macro = temp->control_macro;
            }
        }
      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, macbuf_whitespace = 0;

              parse_set_mark (&macro_mark, pfile);
              for (;;)
                {
                  cpp_skip_hspace (pfile);
                  c = PEEKC ();
                  is_macro_call = c == '(';
                  if (c != EOF)
                    {
                      if (c != '\n')
                        break;
                      FORWARD (1);
                    }
                  else
                    {
                      if (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
                        {
                          if (macro_mark.position !=
                              (CPP_BUFFER (pfile)->cur
                               - CPP_BUFFER (pfile)->buf))
                             macbuf_whitespace = 1;

                          parse_clear_mark (&macro_mark);
                          cpp_pop_buffer (pfile);
                          parse_set_mark (&macro_mark, pfile);
                        }
                      else
                        break;
                    }
                }
              if (!is_macro_call)
                {
                  parse_goto_mark (&macro_mark, pfile);
                  if (macbuf_whitespace)
                    CPP_PUTC (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.  */

static 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 == '$' && CPP_PEDANTIC (pfile))
        cpp_pedwarn (pfile, "`$' 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;
}

/* 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;
  struct include_hash *ih_fake;

  /* 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;

  /* Now that we know dollars_in_ident for real,
     reset is_idchar/is_idstart. */
  is_idchar['$'] = opts->dollars_in_ident;
  is_idstart['$'] = opts->dollars_in_ident;
  
  /* 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.  */
  GET_ENV_PATH_LIST (p, "CPATH");
  if (p != 0 && ! opts->no_standard_includes)
    path_include (pfile, p);

  /* 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 == 0)
    {
      opts->in_fname = fname;
      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);
              cpp_undef (pfile, 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:
        GET_ENV_PATH_LIST (epath, "C_INCLUDE_PATH");
        break;
      case 1:
        GET_ENV_PATH_LIST (epath, "CPLUS_INCLUDE_PATH");
        break;
      case 2:
        GET_ENV_PATH_LIST (epath, "OBJC_INCLUDE_PATH");
        break;
      case 3:
        GET_ENV_PATH_LIST (epath, "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 = xstrdup (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));
    }
  }

  /* 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 = xstrdup (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.  */
            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);

            append_include_chain (pfile, &opts->system_include,
                                  str, !p->cxx_aware);
          }
        }
      }
    /* 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)) {
        const char *str = update_path (p->fname, p->component);
        append_include_chain (pfile, &opts->system_include,
                              str, !p->cxx_aware);
      }
    }
  }

  merge_include_chains (opts);

  /* 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->quote_include; p; p = p->next) {
      if (p == opts->bracket_include)
        fprintf (stderr, "#include <...> search starts here:\n");
      fprintf (stderr, " %s\n", p->name);
    }
    fprintf (stderr, "End of search list.\n");
  }

  /* 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

  /* Must call finclude() on the main input before processing
     -include switches; otherwise the -included text winds up
     after the main input. */
  ih_fake = (struct include_hash *) xmalloc (sizeof (struct include_hash));
  ih_fake->next = 0;
  ih_fake->next_this_file = 0;
  ih_fake->foundhere = ABSOLUTE_PATH;  /* well sort of ... */
  ih_fake->name = fname;
  ih_fake->control_macro = 0;
  ih_fake->buf = (char *)-1;
  ih_fake->limit = 0;
  if (!finclude (pfile, f, ih_fake))
    return 0;
  output_line_command (pfile, 0, same_file);
  pfile->only_seen_white = 2;

  /* The -imacros files can be scanned now, but the -include files
     have to be pushed onto the include stack and processed later,
     in the main loop calling cpp_get_token.  That means the -include
     files have to be processed in reverse order of the pending list,
     which means the pending list has to be reversed again, which
     means the -imacros files have to be done separately and first. */
  
  pfile->no_record_file++;
  opts->no_output++;
  for (pend = opts->pending; pend; pend = pend->next)
    {
      if (pend->cmd != NULL)
        {
          if (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;

              ih_fake = (struct include_hash *)
                  xmalloc (sizeof (struct include_hash));
              ih_fake->next = 0;
              ih_fake->next_this_file = 0;
              ih_fake->foundhere = ABSOLUTE_PATH;  /* well sort of ... */
              ih_fake->name = pend->arg;
              ih_fake->control_macro = 0;
              ih_fake->buf = (char *)-1;
              ih_fake->limit = 0;
              if (!finclude (pfile, fd, ih_fake))
                cpp_scan_buffer (pfile);
              free (ih_fake);
            }
        }
    }
  opts->no_output--;
  opts->pending = nreverse_pending (opts->pending);
  for (pend = opts->pending; pend; pend = pend->next)
    {
      if (pend->cmd != NULL)
        {
          if (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;

              ih_fake = (struct include_hash *)
                  xmalloc (sizeof (struct include_hash));
              ih_fake->next = 0;
              ih_fake->next_this_file = 0;
              ih_fake->foundhere = ABSOLUTE_PATH;  /* well sort of ... */
              ih_fake->name = pend->arg;
              ih_fake->control_macro = 0;
              ih_fake->buf = (char *)-1;
              ih_fake->limit = 0;
              if (finclude (pfile, fd, ih_fake))
                output_line_command (pfile, 0, enter_file);
            }
        }
    }
  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;

  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->timebuf = NULL;
  pfile->only_seen_white = 1;
  pfile->buffer = CPP_NULL_BUFFER(pfile);
  pfile->actual_dirs = NULL;
}

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;
}

\f
static void
print_help ()
{
  printf ("Usage: %s [switches] input output\n", progname);
  printf ("Switches:\n");
  printf ("  -include <file>           Include the contents of <file> before other files\n");
  printf ("  -imacros <file>           Accept definition of marcos in <file>\n");
  printf ("  -iprefix <path>           Specify <path> as a prefix for next two options\n");
  printf ("  -iwithprefix <dir>        Add <dir> to the end of the system include paths\n");
  printf ("  -iwithprefixbefore <dir>  Add <dir> to the end of the main include paths\n");
  printf ("  -isystem <dir>            Add <dir> to the start of the system include paths\n");
  printf ("  -idirafter <dir>          Add <dir> to the end of the system include paths\n");
  printf ("  -I <dir>                  Add <dir> to the end of the main include paths\n");
  printf ("  -nostdinc                 Do not search the system include directories\n");
  printf ("  -nostdinc++               Do not search the system include directories for C++\n");
  printf ("  -o <file>                 Put output into <file>\n");
  printf ("  -pedantic                 Issue all warnings demanded by strict ANSI C\n");
  printf ("  -traditional              Follow K&R pre-processor behaviour\n");
  printf ("  -trigraphs                Support ANSI C trigraphs\n");
  printf ("  -lang-c                   Assume that the input sources are in C\n");
  printf ("  -lang-c89                 Assume that the input sources are in C89\n");
  printf ("  -lang-c++                 Assume that the input sources are in C++\n");
  printf ("  -lang-objc                Assume that the input sources are in ObjectiveC\n");
  printf ("  -lang-objc++              Assume that the input sources are in ObjectiveC++\n");
  printf ("  -lang-asm                 Assume that the input sources are in assembler\n");
  printf ("  -lang-chill               Assume that the input sources are in Chill\n");
  printf ("  -+                        Allow parsing of C++ style features\n");
  printf ("  -w                        Inhibit warning messages\n");
  printf ("  -Wtrigraphs               Warn if trigraphs are encountered\n");
  printf ("  -Wno-trigraphs            Do not warn about trigraphs\n");
  printf ("  -Wcomment{s}              Warn if one comment starts inside another\n");
  printf ("  -Wno-comment{s}           Do not warn about comments\n");
  printf ("  -Wtraditional             Warn if a macro argument is/would be turned into\n");
  printf ("                             a string if -traditional is specified\n");
  printf ("  -Wno-traditional          Do not warn about stringification\n");
  printf ("  -Wundef                   Warn if an undefined macro is used by #if\n");
  printf ("  -Wno-undef                Do not warn about testing undefined macros\n");
  printf ("  -Wimport                  Warn about the use of the #import directive\n");
  printf ("  -Wno-import               Do not warn about the use of #import\n");
  printf ("  -Werror                   Treat all warnings as errors\n");
  printf ("  -Wno-error                Do not treat warnings as errors\n");
  printf ("  -Wall                     Enable all preprocessor warnings\n");
  printf ("  -M                        Generate make dependencies\n");
  printf ("  -MM                       As -M, but ignore system header files\n");
  printf ("  -MD                       As -M, but put output in a .d file\n");
  printf ("  -MMD                      As -MD, but ignore system header files\n");
  printf ("  -MG                       Treat missing header file as generated files\n");
  printf ("  -g                        Include #define and #undef directives in the output\n");
  printf ("  -D<macro>                 Define a <macro> with string '1' as its value\n");
  printf ("  -D<macro>=<val>           Define a <macro> with <val> as its value\n");
  printf ("  -A<question> (<answer>)   Assert the <answer> to <question>\n");
  printf ("  -U<macro>                 Undefine <macro> \n");
  printf ("  -u or -undef              Do not predefine any macros\n");
  printf ("  -v                        Display the version number\n");
  printf ("  -H                        Print the name of header files as they are used\n");
  printf ("  -C                        Do not discard comments\n");
  printf ("  -dM                       Display a list of macro definitions active at end\n");
  printf ("  -dD                       Preserve macro definitions in output\n");
  printf ("  -dN                       As -dD except that only the names are preserved\n");
  printf ("  -dI                       Include #include directives in the output\n");
  printf ("  -ifoutput                 Describe skipped code blocks in output \n");
  printf ("  -P                        Do not generate #line directives\n");
  printf ("  -$                        Do not include '$' in identifiers\n");
  printf ("  -remap                    Remap file names when including files.\n");
  printf ("  -h or --help              Display this information\n");
}
\f

/* Handle one command-line option in (argc, argv).
   Can be called multiple times, to handle multiple sets of options.
   Returns number of strings consumed.  */
int
cpp_handle_option (pfile, argc, argv)
     cpp_reader *pfile;
     int argc;
     char **argv;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  int i = 0;

  if (user_label_prefix == NULL)
    user_label_prefix = USER_LABEL_PREFIX;

  if (argv[i][0] != '-') {
    if (opts->out_fname != NULL)
      {
        print_help ();
        cpp_fatal (pfile, "Too many arguments");
      }
    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 'f':
      if (!strcmp (argv[i], "-fleading-underscore"))
        user_label_prefix = "_";
      else if (!strcmp (argv[i], "-fno-leading-underscore"))
        user_label_prefix = "";
      break;

    case 'I':                   /* Add directory to path for includes.  */
      if (!strcmp (argv[i] + 2, "-"))
        {
          if (! opts->ignore_srcdir)
            {
              opts->ignore_srcdir = 1;
              /* Don't use any preceding -I directories for #include <...>. */
              opts->quote_include = opts->bracket_include;
              opts->bracket_include = 0;
            }
        }
      else
        {
          char *fname;
          if (argv[i][2] != 0)
            fname = argv[i] + 2;
          else if (i + 1 == argc)
            goto missing_dirname;
          else
            fname = argv[++i];
          append_include_chain (pfile, &opts->bracket_include, fname, 0);
        }
      break;

    case 'i':
      /* Add directory to beginning of system include path, as a system
         include directory. */
      if (!strcmp (argv[i], "-isystem"))
        {
          if (i + 1 == argc)
            goto missing_filename;
          append_include_chain (pfile, &opts->system_include, argv[++i], 1);
        }
      /* Add directory to end of path for includes,
         with the default prefix at the front of its name.  */
      else if (!strcmp (argv[i], "-iwithprefix"))
        {
          char *fname;
          if (i + 1 == argc)
            goto missing_dirname;
          ++i;

          if (opts->include_prefix != 0)
            {
              fname = xmalloc (strlen (opts->include_prefix)
                               + strlen (argv[i]) + 1);
              strcpy (fname, opts->include_prefix);
              strcat (fname, argv[i]);
            }
          else
            {
              fname = xmalloc (strlen (GCC_INCLUDE_DIR)
                               + strlen (argv[i]) + 1);
              strcpy (fname, GCC_INCLUDE_DIR);
              /* Remove the `include' from /usr/local/lib/gcc.../include.  */
              if (!strcmp (fname + strlen (fname) - 8, "/include"))
                fname[strlen (fname) - 7] = 0;
              strcat (fname, argv[i]);
            }
          
          append_include_chain (pfile, &opts->system_include, fname, 0);
      }
      /* Add directory to main path for includes,
         with the default prefix at the front of its name.  */
      else if (!strcmp (argv[i], "-iwithprefix"))
        {
          char *fname;
          if (i + 1 == argc)
            goto missing_dirname;
          ++i;

          if (opts->include_prefix != 0)
            {
              fname = xmalloc (strlen (opts->include_prefix)
                               + strlen (argv[i]) + 1);
              strcpy (fname, opts->include_prefix);
              strcat (fname, argv[i]);
            }
          else
            {
              fname = xmalloc (strlen (GCC_INCLUDE_DIR)
                               + strlen (argv[i]) + 1);
              strcpy (fname, GCC_INCLUDE_DIR);
              /* Remove the `include' from /usr/local/lib/gcc.../include.  */
              if (!strcmp (fname + strlen (fname) - 8, "/include"))
                fname[strlen (fname) - 7] = 0;
              strcat (fname, argv[i]);
            }
          
          append_include_chain (pfile, &opts->bracket_include, fname, 0);
        }
      /* Add directory to end of path for includes.  */
      else if (!strcmp (argv[i], "-idirafter"))
        {
          if (i + 1 == argc)
            goto missing_dirname;
          append_include_chain (pfile, &opts->after_include, argv[++i], 0);
        }
      else 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++;
        }
      else if (!strcmp (argv[i], "-iprefix"))
        {
          if (i + 1 == argc)
            goto missing_filename;
          else
              opts->include_prefix = argv[++i];
        }
      else if (!strcmp (argv[i], "-ifoutput"))
        opts->output_conditionals = 1;

      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;
        opts->cplusplus_comments = 0;
      } 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 '-':
      if (strcmp (argv[i], "--help") != 0)
        return i;
      print_help ();
      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");
          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 '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 + 1;
}

/* 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 strings consumed.  */

int
cpp_handle_options (pfile, argc, argv)
     cpp_reader *pfile;
     int argc;
     char **argv;
{
  int i;
  int strings_processed;
  for (i = 0; i < argc; i += strings_processed)
    {
      strings_processed = cpp_handle_option (pfile, argc - i, argv + i);
      if (strings_processed == 0)
        break;
    }
  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");
            }
        }
    }

#if 0
  /* Debugging: dump statistics on the include hash table. */
  {
      struct include_hash *x;
      int i, j;

      for(i = 0; i < ALL_INCLUDE_HASHSIZE; i++)
      {
          x = pfile->all_include_files[i];
          j = 0;
          while(x)
          {
              j++;
              x = x->next;
          }
          fprintf(stderr, "%d/%d ", i, j);
      }
      fputc('\n', stderr);
  }
#endif
  
}

/* 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);
    }

  for (i = ALL_INCLUDE_HASHSIZE; --i >= 0; )
    {
      struct include_hash *imp = pfile->all_include_files[i];
      while (imp)
        {
          struct include_hash *next = imp->next;
#if 0
          /* This gets freed elsewhere - I think. */
          free (imp->name);
#endif
          free (imp);
          imp = next;
        }
      pfile->all_include_files[i] = 0;
    }

  cpp_hash_cleanup (pfile);
}
\f
/* Read an assertion into the token buffer, converting to
   canonical form: `#predicate(a n swe r)'  The next non-whitespace
   character to read should be the first letter of the predicate.
   Returns 0 for syntax error, 1 for bare predicate, 2 for predicate
   with answer (see callers for why). In case of 0, an error has been
   printed. */
static int
parse_assertion (pfile)
     cpp_reader *pfile;
{
  int c, dropwhite;
  cpp_skip_hspace (pfile);
  c = PEEKC();
  if (! is_idstart[c])
    {
      cpp_error (pfile, "assertion predicate is not an identifier");
      return 0;
    }
  CPP_PUTC(pfile, '#');
  FORWARD(1);
  parse_name(pfile, c);

  c = PEEKC();
  if (c != '(')
    {
      if (is_hor_space[c])
        cpp_skip_hspace (pfile);
      c = PEEKC();
    }
  if (c != '(')
    return 1;

  CPP_PUTC(pfile, '(');
  FORWARD(1);
  dropwhite = 1;
  while ((c = GETC()) != ')')
    {
      if (is_hor_space[c])
        {
          if (! dropwhite)
            {
              CPP_PUTC(pfile, ' ');
              dropwhite = 1;
            }
        }
      else if (c == '\\' && PEEKC() == '\n')
        FORWARD(1);
      else if (c == '\n' || c == EOF)
        {
          if (c == '\n') FORWARD(-1);
          cpp_error (pfile, "un-terminated assertion answer");
          return 0;
        }
      else
        {
          CPP_PUTC(pfile, c);
          dropwhite = 0;
        }
    }

  if (pfile->limit[-1] == ' ')
    pfile->limit[-1] = ')';
  else if (pfile->limit[-1] == '(')
    {
      cpp_error (pfile, "empty token sequence in assertion");
      return 0;
    }
  else
    CPP_PUTC(pfile, ')');

  CPP_NUL_TERMINATE(pfile);
  return 2;
}

static int
do_assert (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  char *sym;
  int ret, c;
  HASHNODE *base, *this;
  int baselen, thislen;

  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);
  sym = CPP_PWRITTEN (pfile);   /* remember where it starts */
  ret = parse_assertion (pfile);
  if (ret == 0)
    goto error;
  else if (ret == 1)
    {
      cpp_error (pfile, "missing token-sequence in `#assert'");
      goto error;
    }

  cpp_skip_hspace (pfile);
  c = PEEKC();
  if (c != EOF && c != '\n')
    {
      cpp_error (pfile, "junk at end of `#assert'");
      goto error;
    }

  thislen = strlen (sym);
  baselen = index (sym, '(') - sym;
  this = cpp_lookup (pfile, sym, thislen, -1);
  if (this)
    {
      cpp_warning (pfile, "`%s' re-asserted", sym);
      goto error;
    }

  base = cpp_lookup (pfile, sym, baselen, -1);
  if (! base)
    base = install (sym, baselen, T_ASSERT, 0, 0, -1);
  else if (base->type != T_ASSERT)
  {
    /* Token clash - but with what?! */
    cpp_fatal (pfile,
               "cpp internal error: base->type != T_ASSERT in do_assert");
    goto error;
  }

  this = install (sym, thislen, T_ASSERT, 0,
                  (char *)base->value.aschain, -1);
  base->value.aschain = this;
  
  pfile->limit = sym; /* Pop */
  return 0;

 error:
  pfile->limit = sym; /* Pop */
  skip_rest_of_line (pfile);
  return 1;
}

static int
do_unassert (pfile, keyword)
     cpp_reader *pfile;
     struct directive *keyword ATTRIBUTE_UNUSED;
{
  int c, ret;
  char *sym;
  long baselen, thislen;
  HASHNODE *base, *this, *next;
  
  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);

  sym = CPP_PWRITTEN (pfile);   /* remember where it starts */
  ret = parse_assertion (pfile);
  if (ret == 0)
    goto error;
  
  cpp_skip_hspace (pfile);
  c = PEEKC ();
  if (c != EOF && c != '\n')
      cpp_error (pfile, "junk at end of `#unassert'");

  thislen = strlen (sym);
  if (ret == 1)
    {
      base = cpp_lookup (pfile, sym, thislen, -1);
      if (! base)
        goto error;  /* It isn't an error to #undef what isn't #defined,
                        so it isn't an error to #unassert what isn't
                        #asserted either. */
      
      for (this = base->value.aschain; this; this = next)
        {
          next = this->value.aschain;
          delete_macro (this);
        }
      delete_macro (base);
    }
  else
    {
      baselen = index (sym, '(') - sym;
      base = cpp_lookup (pfile, sym, baselen, -1);
      if (! base) goto error;
      this = cpp_lookup (pfile, sym, thislen, -1);
      if (! this) goto error;

      next = base;
      while (next->value.aschain != this)
        next = next->value.aschain;

      next->value.aschain = this->value.aschain;
      delete_macro (this);

      if (base->value.aschain == NULL)
        delete_macro (base);  /* Last answer for this predicate deleted. */
    }
  
  pfile->limit = sym; /* Pop */
  return 0;
 error:
  pfile->limit = sym; /* Pop */
  skip_rest_of_line (pfile);
  return 1;
}

int
cpp_read_check_assertion (pfile)
     cpp_reader *pfile;
{
  char *name = CPP_PWRITTEN (pfile);
  int result;
  HASHNODE *hp;
  
  FORWARD (1);  /* Skip '#' */
  cpp_skip_hspace (pfile);
  if (! parse_assertion (pfile))
    result = 0;
  else
    {
      hp = cpp_lookup (pfile, name, (char *)CPP_PWRITTEN (pfile) - name, -1);
      result = (hp != 0);
    }

  pfile->limit = name;
  return result;
}

/* 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;
}

\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);
    }
}

static void
v_cpp_error (pfile, msg, ap)
  cpp_reader *pfile;
  const char *msg;
  va_list ap;
{
  cpp_print_containing_files (pfile);
  cpp_print_file_and_line (pfile);
  v_cpp_message (pfile, 1, msg, ap);
}

void
cpp_error VPROTO ((cpp_reader * pfile, const char *msg, ...))
{
#ifndef ANSI_PROTOTYPES
  cpp_reader *pfile;
  const char *msg;
#endif
  va_list ap;

  VA_START(ap, msg);
  
#ifndef ANSI_PROTOTYPES
  pfile = va_arg (ap, cpp_reader *);
  msg = va_arg (ap, const char *);
#endif

  v_cpp_error (pfile, msg, ap);
  va_end(ap);
}

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

static void
v_cpp_warning (pfile, msg, ap)
  cpp_reader *pfile;
  const char *msg;
  va_list ap;
{
  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);
  v_cpp_message (pfile, 0, msg, ap);
}

void
cpp_warning VPROTO ((cpp_reader * pfile, const char *msg, ...))
{
#ifndef ANSI_PROTOTYPES
  cpp_reader *pfile;
  const char *msg;
#endif
  va_list ap;
  
  VA_START (ap, msg);
  
#ifndef ANSI_PROTOTYPES
  pfile = va_arg (ap, cpp_reader *);
  msg = va_arg (ap, const char *);
#endif

  v_cpp_warning (pfile, msg, ap);
  va_end(ap);
}

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

void
cpp_pedwarn VPROTO ((cpp_reader * pfile, const char *msg, ...))
{
#ifndef ANSI_PROTOTYPES
  cpp_reader *pfile;
  const char *msg;
#endif
  va_list ap;
  
  VA_START (ap, msg);
  
#ifndef ANSI_PROTOTYPES
  pfile = va_arg (ap, cpp_reader *);
  msg = va_arg (ap, const char *);
#endif

  if (CPP_OPTIONS (pfile)->pedantic_errors)
    v_cpp_error (pfile, msg, ap);
  else
    v_cpp_warning (pfile, msg, ap);
  va_end(ap);
}

static void
v_cpp_error_with_line (pfile, line, column, msg, ap)
  cpp_reader * pfile;
  int line;
  int column;
  const char * msg;
  va_list ap;
{
  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);

  v_cpp_message (pfile, 1, msg, ap);
}

void
cpp_error_with_line VPROTO ((cpp_reader * pfile, int line, int column, const char *msg, ...))
{
#ifndef ANSI_PROTOTYPES
  cpp_reader *pfile;
  int line;
  int column;
  const char *msg;
#endif
  va_list ap;
  
  VA_START (ap, msg);
  
#ifndef ANSI_PROTOTYPES
  pfile = va_arg (ap, cpp_reader *);
  line = va_arg (ap, int);
  column = va_arg (ap, int);
  msg = va_arg (ap, const char *);
#endif

  v_cpp_error_with_line(pfile, line, column, msg, ap);
  va_end(ap);
}

static void
v_cpp_warning_with_line (pfile, line, column, msg, ap)
  cpp_reader * pfile;
  int line;
  int column;
  const char *msg;
  va_list ap;
{
  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);

  v_cpp_message (pfile, 0, msg, ap);
}  

#if 0
static void
cpp_warning_with_line VPROTO ((cpp_reader * pfile, int line, int column, const char *msg, ...))
{
#ifndef ANSI_PROTOTYPES
  cpp_reader *pfile;
  int line;
  int column;
  const char *msg;
#endif
  va_list ap;
  
  VA_START (ap, msg);
  
#ifndef ANSI_PROTOTYPES
  pfile = va_arg (ap, cpp_reader *);
  line = va_arg (ap, int);
  column = va_arg (ap, int);
  msg = va_arg (ap, const char *);
#endif

  v_cpp_warning_with_line (pfile, line, column, msg, ap);
  va_end(ap);
}
#endif

void
cpp_pedwarn_with_line VPROTO ((cpp_reader * pfile, int line, int column, const char *msg, ...))
{
#ifndef ANSI_PROTOTYPES
  cpp_reader *pfile;
  int line;
  int column;
  const char *msg;
#endif
  va_list ap;
  
  VA_START (ap, msg);
  
#ifndef ANSI_PROTOTYPES
  pfile = va_arg (ap, cpp_reader *);
  line = va_arg (ap, int);
  column = va_arg (ap, int);
  msg = va_arg (ap, const char *);
#endif

  if (CPP_OPTIONS (pfile)->pedantic_errors)
    v_cpp_error_with_line (pfile, column, line, msg, ap);
  else
    v_cpp_warning_with_line (pfile, line, column, msg, ap);
  va_end(ap);
}

/* 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 VPROTO ((cpp_reader *pfile, char *file, int line, const char *msg, ...))
{
#ifndef ANSI_PROTOTYPES
  cpp_reader *pfile;
  char *file;
  int line;
  const char *msg;
#endif
  va_list ap;
  
  VA_START (ap, msg);

#ifndef ANSI_PROTOTYPES
  pfile = va_arg (ap, cpp_reader *);
  file = va_arg (ap, char *);
  line = va_arg (ap, int);
  msg = va_arg (ap, const char *);
#endif

  if (!CPP_OPTIONS (pfile)->pedantic_errors
      && CPP_OPTIONS (pfile)->inhibit_warnings)
    return;
  if (file != NULL)
    cpp_file_line_for_message (pfile, file, line, -1);
  v_cpp_message (pfile, CPP_OPTIONS (pfile)->pedantic_errors, msg, ap);
  va_end(ap);
}

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

static 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;
     const char *name;
{
  cpp_message_from_errno (pfile, 1, name);
}

void
cpp_message_from_errno (pfile, is_error, name)
     cpp_reader *pfile;
     int is_error;
     const char *name;
{
  int e = errno;
  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, is_error, "%s: %s", name, my_strerror (e));
}

void
cpp_perror_with_name (pfile, name)
     cpp_reader *pfile;
     const 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.
 *
 * Find and cleanup remaining uses of static variables,
 *
 * Support for trigraphs.
 *
 * Support -dM flag (dump_all_macros).
 *
 * Support for_lint flag.
 */