gcc/fix-header.c

   1 /* fix-header.c - Make C header file suitable for C++.
   2    Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option) any
   8 later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 /* This program massages a system include file (such as stdio.h),
  20    into a form that is compatible with GNU C and GNU C++.
  21
  22    * extern "C" { ... } braces are added (inside #ifndef __cplusplus),
  23    if they seem to be needed.  These prevent C++ compilers from name
  24    mangling the functions inside the braces.
  25
  26    * If an old-style incomplete function declaration is seen (without
  27    an argument list), and it is a "standard" function listed in
  28    the file sys-protos.h (and with a non-empty argument list), then
  29    the declaration is converted to a complete prototype by replacing
  30    the empty parameter list with the argument list from sys-protos.h.
  31
  32    * The program can be given a list of (names of) required standard
  33    functions (such as fclose for stdio.h).  If a required function
  34    is not seen in the input, then a prototype for it will be
  35    written to the output.
  36
  37    * If all of the non-comment code of the original file is protected
  38    against multiple inclusion:
  39         #ifndef FOO
  40         #define FOO
  41         <body of include file>
  42         #endif
  43    then extra matter added to the include file is placed inside the <body>.
  44
  45    * If the input file is OK (nothing needs to be done);
  46    the output file is not written (nor removed if it exists).
  47
  48    There are also some special actions that are done for certain
  49    well-known standard include files:
  50
  51    * If argv[1] is "sys/stat.h", the Posix.1 macros
  52    S_ISBLK, S_ISCHR, S_ISDIR, S_ISFIFO, S_ISLNK, S_ISREG are added if
  53    they were missing, and the corresponding "traditional" S_IFxxx
  54    macros were defined.
  55
  56    * If argv[1] is "errno.h", errno is declared if it was missing.
  57
  58    * TODO:  The input file should be read complete into memory, because:
  59    a) it needs to be scanned twice anyway, and
  60    b) it would be nice to allow update in place.
  61
  62    Usage:
  63         fix-header FOO.H INFILE.H OUTFILE.H [OPTIONS]
  64    where:
  65    * FOO.H is the relative file name of the include file,
  66    as it would be #include'd by a C file.  (E.g. stdio.h)
  67    * INFILE.H is a full pathname for the input file (e.g. /usr/include/stdio.h)
  68    * OUTFILE.H is the full pathname for where to write the output file,
  69    if anything needs to be done.  (e.g. ./include/stdio.h)
  70    * OPTIONS can be -D or -I switches as you would pass to cpp.
  71
  72    Written by Per Bothner <bothner@cygnus.com>, July 1993.  */
  73
  74 #include "bconfig.h"
  75 #include "system.h"
  76 #include "coretypes.h"
  77 #include "tm.h"
  78 #include "obstack.h"
  79 #include "scan.h"
  80 #include "cpplib.h"
  81 #include "c-incpath.h"
  82
  83 static void v_fatal PARAMS ((const char *, va_list)) ATTRIBUTE_PRINTF (1,0) ATTRIBUTE_NORETURN;
  84 static void fatal PARAMS ((const char *, ...)) ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
  85
  86 sstring buf;
  87
  88 int verbose = 0;
  89 int partial_count = 0;
  90 int warnings = 0;
  91
  92 #if ADD_MISSING_EXTERN_C
  93 int missing_extern_C_count = 0;
  94 #endif
  95
  96 #include "xsys-protos.h"
  97
  98 #ifdef FIXPROTO_IGNORE_LIST
  99 /* This is a currently unused feature.  */
 100
 101 /* List of files and directories to ignore.
 102    A directory name (ending in '/') means ignore anything in that
 103    directory.  (It might be more efficient to do directory pruning
 104    earlier in fixproto, but this is simpler and easier to customize.) */
 105
 106 static const char *const files_to_ignore[] = {
 107   "X11/",
 108   FIXPROTO_IGNORE_LIST
 109   0
 110 };
 111 #endif
 112
 113 char *inf_buffer;
 114 char *inf_limit;
 115 char *inf_ptr;
 116 static const char *cur_file;
 117
 118 /* Certain standard files get extra treatment */
 119
 120 enum special_file
 121 {
 122   no_special,
 123 #ifdef errno_h
 124 #undef errno_h
 125 #endif
 126   errno_h,
 127 #ifdef stdio_h
 128 #undef stdio_h
 129 #endif
 130   stdio_h,
 131 #ifdef stdlib_h
 132 #undef stdlib_h
 133 #endif
 134   stdlib_h,
 135 #ifdef sys_stat_h
 136 #undef sys_stat_h
 137 #endif
 138   sys_stat_h
 139 };
 140
 141 /* A NAMELIST is a sequence of names, separated by '\0', and terminated
 142    by an empty name (i.e. by "\0\0").  */
 143
 144 typedef const char *namelist;
 145
 146 /* The following macros provide the bits for symbol_flags.  */
 147 typedef int symbol_flags;
 148
 149 /* Used to mark names defined in the ANSI/ISO C standard.  */
 150 #define ANSI_SYMBOL 1
 151
 152 /* We no longer massage include files for POSIX or XOPEN symbols,
 153    as there are now several versions of the POSIX and XOPEN standards,
 154    and it would be a maintenance nightmare for us to track them all.
 155    Better to be compatible with the system include files.  */
 156 /*#define ADD_MISSING_POSIX 1 */
 157 /*#define ADD_MISSING_XOPEN 1 */
 158
 159 #if ADD_MISSING_POSIX
 160 /* Used to mark names defined in the Posix.1 or Posix.2 standard.  */
 161 #define POSIX1_SYMBOL 2
 162 #define POSIX2_SYMBOL 4
 163 #else
 164 #define POSIX1_SYMBOL 0
 165 #define POSIX2_SYMBOL 0
 166 #endif
 167
 168 #if ADD_MISSING_XOPEN
 169 /* Used to mark names defined in X/Open Portability Guide.  */
 170 #define XOPEN_SYMBOL 8
 171 /* Used to mark names defined in X/Open UNIX Extensions.  */
 172 #define XOPEN_EXTENDED_SYMBOL 16
 173 #else
 174 #define XOPEN_SYMBOL 0
 175 #define XOPEN_EXTENDED_SYMBOL 0
 176 #endif
 177
 178 /* Used to indicate names that are not functions */
 179 #define MACRO_SYMBOL 512
 180
 181 struct symbol_list {
 182   symbol_flags flags;
 183   namelist names;
 184 };
 185
 186 #define SYMBOL_TABLE_SIZE 10
 187 struct symbol_list symbol_table[SYMBOL_TABLE_SIZE];
 188 int cur_symbol_table_size;
 189
 190 static void add_symbols PARAMS ((symbol_flags, namelist));
 191 static struct fn_decl *lookup_std_proto PARAMS ((const char *, int));
 192 static void write_lbrac PARAMS ((void));
 193 static void recognized_macro PARAMS ((const char *));
 194 static void check_macro_names PARAMS ((cpp_reader *, namelist));
 195 static void read_scan_file PARAMS ((char *, int, char **));
 196 static void write_rbrac PARAMS ((void));
 197 static int inf_skip_spaces PARAMS ((int));
 198 static int inf_read_upto PARAMS ((sstring *, int));
 199 static int inf_scan_ident PARAMS ((sstring *, int));
 200 static int check_protection PARAMS ((int *, int *));
 201 static void cb_file_change PARAMS ((cpp_reader *, const struct line_map *));
 202
 203 static void
 204 add_symbols (flags, names)
 205      symbol_flags flags;
 206      namelist names;
 207 {
 208   symbol_table[cur_symbol_table_size].flags = flags;
 209   symbol_table[cur_symbol_table_size].names = names;
 210   cur_symbol_table_size++;
 211   if (cur_symbol_table_size >= SYMBOL_TABLE_SIZE)
 212     fatal ("too many calls to add_symbols");
 213   symbol_table[cur_symbol_table_size].names = NULL; /* Termination.  */
 214 }
 215
 216 struct std_include_entry {
 217   const char *const name;
 218   const symbol_flags flags;
 219   const namelist names;
 220 };
 221
 222 const char NONE[] = "";  /* The empty namelist.  */
 223
 224 /* Special name to indicate a continuation line in std_include_table.  */
 225 const char CONTINUED[] = "";
 226
 227 const struct std_include_entry *include_entry;
 228
 229 const struct std_include_entry std_include_table [] = {
 230   { "ctype.h", ANSI_SYMBOL,
 231       "isalnum\0isalpha\0iscntrl\0isdigit\0isgraph\0islower\0\
 232 isprint\0ispunct\0isspace\0isupper\0isxdigit\0tolower\0toupper\0" },
 233
 234   { "dirent.h", POSIX1_SYMBOL, "closedir\0opendir\0readdir\0rewinddir\0"},
 235
 236   { "errno.h", ANSI_SYMBOL|MACRO_SYMBOL, "errno\0" },
 237
 238   /* ANSI_SYMBOL is wrong, but ...  */
 239   { "curses.h", ANSI_SYMBOL, "box\0delwin\0endwin\0getcurx\0getcury\0initscr\0\
 240 mvcur\0mvwprintw\0mvwscanw\0newwin\0overlay\0overwrite\0\
 241 scroll\0subwin\0touchwin\0waddstr\0wclear\0wclrtobot\0wclrtoeol\0\
 242 waddch\0wdelch\0wdeleteln\0werase\0wgetch\0wgetstr\0winsch\0winsertln\0\
 243 wmove\0wprintw\0wrefresh\0wscanw\0wstandend\0wstandout\0" },
 244
 245   { "fcntl.h", POSIX1_SYMBOL, "creat\0fcntl\0open\0" },
 246
 247   /* Maybe also "getgrent fgetgrent setgrent endgrent" */
 248   { "grp.h", POSIX1_SYMBOL, "getgrgid\0getgrnam\0" },
 249
 250 /*{ "limit.h", ... provided by gcc }, */
 251
 252   { "locale.h", ANSI_SYMBOL, "localeconv\0setlocale\0" },
 253
 254   { "math.h", ANSI_SYMBOL,
 255       "acos\0asin\0atan\0atan2\0ceil\0cos\0cosh\0exp\0\
 256 fabs\0floor\0fmod\0frexp\0ldexp\0log10\0log\0modf\0pow\0sin\0sinh\0sqrt\0\
 257 tan\0tanh\0" },
 258
 259   { CONTINUED, ANSI_SYMBOL|MACRO_SYMBOL, "HUGE_VAL\0" },
 260
 261   { "pwd.h", POSIX1_SYMBOL, "getpwnam\0getpwuid\0" },
 262
 263   /* Left out siglongjmp sigsetjmp - these depend on sigjmp_buf.  */
 264   { "setjmp.h", ANSI_SYMBOL, "longjmp\0setjmp\0" },
 265
 266   /* Left out signal() - its prototype is too complex for us!
 267      Also left out "sigaction sigaddset sigdelset sigemptyset
 268      sigfillset sigismember sigpending sigprocmask sigsuspend"
 269      because these need sigset_t or struct sigaction.
 270      Most systems that provide them will also declare them.  */
 271   { "signal.h", ANSI_SYMBOL, "kill\0raise\0" },
 272
 273   { "stdio.h", ANSI_SYMBOL,
 274       "clearerr\0fclose\0feof\0ferror\0fflush\0fgetc\0fgetpos\0\
 275 fgets\0fopen\0fprintf\0fputc\0fputs\0fread\0freopen\0fscanf\0fseek\0\
 276 fsetpos\0ftell\0fwrite\0getc\0getchar\0gets\0perror\0\
 277 printf\0putc\0putchar\0puts\0remove\0rename\0rewind\0scanf\0setbuf\0\
 278 setvbuf\0sprintf\0sscanf\0vprintf\0vsprintf\0vfprintf\0tmpfile\0\
 279 tmpnam\0ungetc\0" },
 280   { CONTINUED, POSIX1_SYMBOL, "fdopen\0fileno\0" },
 281   { CONTINUED, POSIX2_SYMBOL, "pclose\0popen\0" },  /* I think ...  */
 282 /* Should perhaps also handle NULL, EOF, ... ? */
 283
 284   /* "div ldiv", - ignored because these depend on div_t, ldiv_t
 285      ignore these: "mblen mbstowcs mbstowc wcstombs wctomb"
 286      Left out getgroups, because SunOS4 has incompatible BSD and SVR4 versions.
 287      Should perhaps also add NULL */
 288   { "stdlib.h", ANSI_SYMBOL,
 289       "abort\0abs\0atexit\0atof\0atoi\0atol\0bsearch\0calloc\0\
 290 exit\0free\0getenv\0labs\0malloc\0putenv\0qsort\0rand\0realloc\0\
 291 srand\0strtod\0strtol\0strtoul\0system\0" },
 292   { CONTINUED, ANSI_SYMBOL|MACRO_SYMBOL, "EXIT_FAILURE\0EXIT_SUCCESS\0" },
 293
 294   { "string.h", ANSI_SYMBOL, "memchr\0memcmp\0memcpy\0memmove\0memset\0\
 295 strcat\0strchr\0strcmp\0strcoll\0strcpy\0strcspn\0strerror\0\
 296 strlen\0strncat\0strncmp\0strncpy\0strpbrk\0strrchr\0strspn\0strstr\0\
 297 strtok\0strxfrm\0" },
 298 /* Should perhaps also add NULL and size_t */
 299
 300   { "strings.h", XOPEN_EXTENDED_SYMBOL,
 301       "bcmp\0bcopy\0bzero\0ffs\0index\0rindex\0strcasecmp\0strncasecmp\0" },
 302
 303   { "strops.h", XOPEN_EXTENDED_SYMBOL, "ioctl\0" },
 304
 305   /* Actually, XPG4 does not seem to have <sys/ioctl.h>, but defines
 306      ioctl in <strops.h>.  However, many systems have it is sys/ioctl.h,
 307      and many systems do have <sys/ioctl.h> but not <strops.h>.  */
 308   { "sys/ioctl.h", XOPEN_EXTENDED_SYMBOL, "ioctl\0" },
 309
 310   { "sys/socket.h", XOPEN_EXTENDED_SYMBOL, "socket\0" },
 311
 312   { "sys/stat.h", POSIX1_SYMBOL,
 313       "chmod\0fstat\0mkdir\0mkfifo\0stat\0lstat\0umask\0" },
 314   { CONTINUED, POSIX1_SYMBOL|MACRO_SYMBOL,
 315       "S_ISDIR\0S_ISBLK\0S_ISCHR\0S_ISFIFO\0S_ISREG\0S_ISLNK\0S_IFDIR\0\
 316 S_IFBLK\0S_IFCHR\0S_IFIFO\0S_IFREG\0S_IFLNK\0" },
 317   { CONTINUED, XOPEN_EXTENDED_SYMBOL, "fchmod\0" },
 318
 319 #if 0
 320 /* How do we handle fd_set? */
 321   { "sys/time.h", XOPEN_EXTENDED_SYMBOL, "select\0" },
 322   { "sys/select.h", XOPEN_EXTENDED_SYMBOL /* fake */, "select\0" },
 323 #endif
 324
 325   { "sys/times.h", POSIX1_SYMBOL, "times\0" },
 326   /* "sys/types.h" add types (not in old g++-include) */
 327
 328   { "sys/utsname.h", POSIX1_SYMBOL, "uname\0" },
 329
 330   { "sys/wait.h", POSIX1_SYMBOL, "wait\0waitpid\0" },
 331   { CONTINUED, POSIX1_SYMBOL|MACRO_SYMBOL,
 332       "WEXITSTATUS\0WIFEXITED\0WIFSIGNALED\0WIFSTOPPED\0WSTOPSIG\0\
 333 WTERMSIG\0WNOHANG\0WNOTRACED\0" },
 334
 335   { "tar.h", POSIX1_SYMBOL, NONE },
 336
 337   { "termios.h", POSIX1_SYMBOL,
 338       "cfgetispeed\0cfgetospeed\0cfsetispeed\0cfsetospeed\0tcdrain\0tcflow\0tcflush\0tcgetattr\0tcsendbreak\0tcsetattr\0" },
 339
 340   { "time.h", ANSI_SYMBOL,
 341       "asctime\0clock\0ctime\0difftime\0gmtime\0localtime\0mktime\0strftime\0time\0tzset\0" },
 342
 343   { "unistd.h", POSIX1_SYMBOL,
 344       "_exit\0access\0alarm\0chdir\0chown\0close\0ctermid\0cuserid\0\
 345 dup\0dup2\0execl\0execle\0execlp\0execv\0execve\0execvp\0fork\0fpathconf\0\
 346 getcwd\0getegid\0geteuid\0getgid\0getlogin\0getpgrp\0getpid\0\
 347 getppid\0getuid\0isatty\0link\0lseek\0pathconf\0pause\0pipe\0read\0rmdir\0\
 348 setgid\0setpgid\0setsid\0setuid\0sleep\0sysconf\0tcgetpgrp\0tcsetpgrp\0\
 349 ttyname\0unlink\0write\0" },
 350   { CONTINUED, POSIX2_SYMBOL, "getopt\0" },
 351   { CONTINUED, XOPEN_EXTENDED_SYMBOL,
 352       "lockf\0gethostid\0gethostname\0readlink\0symlink\0" },
 353
 354   { "utime.h", POSIX1_SYMBOL, "utime\0" },
 355
 356   { NULL, 0, NONE }
 357 };
 358
 359 enum special_file special_file_handling = no_special;
 360
 361 /* They are set if the corresponding macro has been seen.  */
 362 /* The following are only used when handling sys/stat.h */
 363 int seen_S_IFBLK = 0, seen_S_ISBLK  = 0;
 364 int seen_S_IFCHR = 0, seen_S_ISCHR  = 0;
 365 int seen_S_IFDIR = 0, seen_S_ISDIR  = 0;
 366 int seen_S_IFIFO = 0, seen_S_ISFIFO = 0;
 367 int seen_S_IFLNK = 0, seen_S_ISLNK  = 0;
 368 int seen_S_IFREG = 0, seen_S_ISREG  = 0;
 369 /* The following are only used when handling errno.h */
 370 int seen_errno = 0;
 371 /* The following are only used when handling stdlib.h */
 372 int seen_EXIT_FAILURE = 0, seen_EXIT_SUCCESS = 0;
 373 \f
 374 struct obstack scan_file_obstack;
 375
 376 /* NOTE:  If you edit this, also edit gen-protos.c !! */
 377
 378 static struct fn_decl *
 379 lookup_std_proto (name, name_length)
 380      const char *name;
 381      int name_length;
 382 {
 383   int i = hashstr (name, name_length) % HASH_SIZE;
 384   int i0 = i;
 385   for (;;)
 386     {
 387       struct fn_decl *fn;
 388       if (hash_tab[i] == 0)
 389         return NULL;
 390       fn = &std_protos[hash_tab[i]];
 391       if ((int) strlen (fn->fname) == name_length
 392           && strncmp (fn->fname, name, name_length) == 0)
 393         return fn;
 394       i = (i+1) % HASH_SIZE;
 395       if (i == i0)
 396         abort ();
 397     }
 398 }
 399
 400 char *inc_filename;
 401 int inc_filename_length;
 402 const char *progname = "fix-header";
 403 FILE *outf;
 404 sstring line;
 405
 406 int lbrac_line, rbrac_line;
 407
 408 int required_unseen_count = 0;
 409 int required_other = 0;
 410
 411 static void
 412 write_lbrac ()
 413 {
 414   if (partial_count)
 415     {
 416       fprintf (outf, "#ifndef _PARAMS\n");
 417       fprintf (outf, "#if defined(__STDC__) || defined(__cplusplus)\n");
 418       fprintf (outf, "#define _PARAMS(ARGS) ARGS\n");
 419       fprintf (outf, "#else\n");
 420       fprintf (outf, "#define _PARAMS(ARGS) ()\n");
 421       fprintf (outf, "#endif\n#endif /* _PARAMS */\n");
 422     }
 423 }
 424
 425 struct partial_proto
 426 {
 427   struct partial_proto *next;
 428   struct fn_decl *fn;
 429   int line_seen;
 430 };
 431
 432 struct partial_proto *partial_proto_list = NULL;
 433
 434 struct partial_proto required_dummy_proto, seen_dummy_proto;
 435 #define REQUIRED(FN) ((FN)->partial == &required_dummy_proto)
 436 #define SET_REQUIRED(FN) ((FN)->partial = &required_dummy_proto)
 437 #define SET_SEEN(FN) ((FN)->partial = &seen_dummy_proto)
 438 #define SEEN(FN) ((FN)->partial == &seen_dummy_proto)
 439
 440 static void
 441 recognized_macro (fname)
 442      const char *fname;
 443 {
 444   /* The original include file defines fname as a macro.  */
 445   struct fn_decl *fn = lookup_std_proto (fname, strlen (fname));
 446
 447   /* Since fname is a macro, don't require a prototype for it.  */
 448   if (fn)
 449     {
 450       if (REQUIRED (fn))
 451         required_unseen_count--;
 452       SET_SEEN (fn);
 453     }
 454
 455   switch (special_file_handling)
 456     {
 457     case errno_h:
 458       if (strcmp (fname, "errno") == 0 && !seen_errno)
 459         seen_errno = 1, required_other--;
 460       break;
 461     case stdlib_h:
 462       if (strcmp (fname, "EXIT_FAILURE") == 0 && !seen_EXIT_FAILURE)
 463         seen_EXIT_FAILURE = 1, required_other--;
 464       if (strcmp (fname, "EXIT_SUCCESS") == 0 && !seen_EXIT_SUCCESS)
 465         seen_EXIT_SUCCESS = 1, required_other--;
 466       break;
 467     case sys_stat_h:
 468       if (fname[0] == 'S' && fname[1] == '_')
 469         {
 470           if (strcmp (fname, "S_IFBLK") == 0) seen_S_IFBLK++;
 471           else if (strcmp (fname, "S_ISBLK") == 0) seen_S_ISBLK++;
 472           else if (strcmp (fname, "S_IFCHR") == 0) seen_S_IFCHR++;
 473           else if (strcmp (fname, "S_ISCHR") == 0) seen_S_ISCHR++;
 474           else if (strcmp (fname, "S_IFDIR") == 0) seen_S_IFDIR++;
 475           else if (strcmp (fname, "S_ISDIR") == 0) seen_S_ISDIR++;
 476           else if (strcmp (fname, "S_IFIFO") == 0) seen_S_IFIFO++;
 477           else if (strcmp (fname, "S_ISFIFO") == 0) seen_S_ISFIFO++;
 478           else if (strcmp (fname, "S_IFLNK") == 0) seen_S_IFLNK++;
 479           else if (strcmp (fname, "S_ISLNK") == 0) seen_S_ISLNK++;
 480           else if (strcmp (fname, "S_IFREG") == 0) seen_S_IFREG++;
 481           else if (strcmp (fname, "S_ISREG") == 0) seen_S_ISREG++;
 482         }
 483       break;
 484
 485     default:
 486       break;
 487     }
 488 }
 489
 490 void
 491 recognized_extern (name)
 492      const cpp_token *name;
 493 {
 494   switch (special_file_handling)
 495     {
 496     case errno_h:
 497       if (cpp_ideq (name, "errno"))
 498         seen_errno = 1, required_other--;
 499       break;
 500
 501     default:
 502       break;
 503     }
 504 }
 505
 506 /* Called by scan_decls if it saw a function definition for a function
 507    named FNAME.  KIND is 'I' for an inline function; 'F' if a normal
 508    function declaration preceded by 'extern "C"' (or nested inside
 509    'extern "C"' braces); or 'f' for other function declarations.  */
 510
 511 void
 512 recognized_function (fname, line, kind, have_arg_list)
 513      const cpp_token *fname;
 514      unsigned int line;
 515      int kind; /* One of 'f' 'F' or 'I' */
 516      int have_arg_list;
 517 {
 518   struct partial_proto *partial;
 519   int i;
 520   struct fn_decl *fn;
 521
 522   fn = lookup_std_proto ((const char *) NODE_NAME (fname->val.node),
 523                          NODE_LEN (fname->val.node));
 524
 525   /* Remove the function from the list of required function.  */
 526   if (fn)
 527     {
 528       if (REQUIRED (fn))
 529         required_unseen_count--;
 530       SET_SEEN (fn);
 531     }
 532
 533   /* If we have a full prototype, we're done.  */
 534   if (have_arg_list)
 535     return;
 536
 537   if (kind == 'I')  /* don't edit inline function */
 538     return;
 539
 540   /* If the partial prototype was included from some other file,
 541      we don't need to patch it up (in this run).  */
 542   i = strlen (cur_file);
 543   if (i < inc_filename_length
 544       || strcmp (inc_filename, cur_file + (i - inc_filename_length)) != 0)
 545     return;
 546
 547   if (fn == NULL)
 548     return;
 549   if (fn->params[0] == '\0')
 550     return;
 551
 552   /* We only have a partial function declaration,
 553      so remember that we have to add a complete prototype.  */
 554   partial_count++;
 555   partial = (struct partial_proto *)
 556     obstack_alloc (&scan_file_obstack, sizeof (struct partial_proto));
 557   partial->line_seen = line;
 558   partial->fn = fn;
 559   fn->partial = partial;
 560   partial->next = partial_proto_list;
 561   partial_proto_list = partial;
 562   if (verbose)
 563     {
 564       fprintf (stderr, "(%s: %s non-prototype function declaration.)\n",
 565                inc_filename, fn->fname);
 566     }
 567 }
 568
 569 /* For any name in NAMES that is defined as a macro,
 570    call recognized_macro on it.  */
 571
 572 static void
 573 check_macro_names (pfile, names)
 574      cpp_reader *pfile;
 575      namelist names;
 576 {
 577   size_t len;
 578   while (*names)
 579     {
 580       len = strlen (names);
 581       if (cpp_defined (pfile, (const unsigned char *)names, len))
 582         recognized_macro (names);
 583       names += len + 1;
 584     }
 585 }
 586
 587 static void
 588 cb_file_change (pfile, map)
 589      cpp_reader *pfile ATTRIBUTE_UNUSED;
 590      const struct line_map *map;
 591 {
 592   /* Just keep track of current file name.  */
 593   cur_file = map->to_file;
 594 }
 595
 596 static void
 597 read_scan_file (in_fname, argc, argv)
 598      char *in_fname;
 599      int argc;
 600      char **argv;
 601 {
 602   cpp_reader *scan_in;
 603   cpp_callbacks *cb;
 604   cpp_options *options;
 605   struct fn_decl *fn;
 606   int i, strings_processed;
 607   struct symbol_list *cur_symbols;
 608
 609   obstack_init (&scan_file_obstack);
 610
 611   scan_in = cpp_create_reader (CLK_GNUC89, NULL);
 612   cb = cpp_get_callbacks (scan_in);
 613   cb->file_change = cb_file_change;
 614
 615   /* We are going to be scanning a header file out of its proper context,
 616      so ignore warnings and errors.  */
 617   options = cpp_get_options (scan_in);
 618   options->inhibit_warnings = 1;
 619   options->inhibit_errors = 1;
 620
 621   if (! cpp_read_main_file (scan_in, in_fname))
 622     exit (FATAL_EXIT_CODE);
 623
 624   cpp_change_file (scan_in, LC_RENAME, "<built-in>");
 625   cpp_init_builtins (scan_in, true);
 626   cpp_change_file (scan_in, LC_RENAME, in_fname);
 627
 628   /* Process switches after builtins so -D can override them.  */
 629   for (i = 0; i < argc; i += strings_processed)
 630     {
 631       strings_processed = 0;
 632       if (argv[i][0] == '-')
 633         {
 634           if (argv[i][1] == 'I')
 635             {
 636               if (argv[i][2] != '\0')
 637                 {
 638                   strings_processed = 1;
 639                   add_path (xstrdup (argv[i] + 2), BRACKET, false);
 640                 }
 641               else if (i + 1 != argc)
 642                 {
 643                   strings_processed = 2;
 644                   add_path (xstrdup (argv[i + 1]), BRACKET, false);
 645                 }
 646             }
 647           else if (argv[i][1] == 'D')
 648             {
 649               if (argv[i][2] != '\0')
 650                 strings_processed = 1, cpp_define (scan_in, argv[i] + 2);
 651               else if (i + 1 != argc)
 652                 strings_processed = 2, cpp_define (scan_in, argv[i + 1]);
 653             }
 654         }
 655
 656       if (strings_processed == 0)
 657         break;
 658     }
 659
 660   if (i < argc)
 661     cpp_error (scan_in, DL_ERROR, "invalid option `%s'", argv[i]);
 662   if (cpp_errors (scan_in))
 663     exit (FATAL_EXIT_CODE);
 664
 665   register_include_chains (scan_in, NULL /* sysroot */, NULL /* iprefix */,
 666                            true /* stdinc */, false /* cxx_stdinc */,
 667                            false /* verbose */);
 668
 669   /* We are scanning a system header, so mark it as such.  */
 670   cpp_make_system_header (scan_in, 1, 0);
 671
 672   scan_decls (scan_in, argc, argv);
 673   for (cur_symbols = &symbol_table[0]; cur_symbols->names; cur_symbols++)
 674     check_macro_names (scan_in, cur_symbols->names);
 675
 676   /* Traditionally, getc and putc are defined in terms of _filbuf and _flsbuf.
 677      If so, those functions are also required.  */
 678   if (special_file_handling == stdio_h
 679       && (fn = lookup_std_proto ("_filbuf", 7)) != NULL)
 680     {
 681       unsigned char getchar_call[] = "getchar();\n";
 682       int seen_filbuf = 0;
 683
 684       /* Scan the macro expansion of "getchar();".  */
 685       cpp_push_buffer (scan_in, getchar_call, sizeof(getchar_call) - 1,
 686                        /* from_stage3 */ true, 1);
 687       for (;;)
 688         {
 689           const cpp_token *t = cpp_get_token (scan_in);
 690
 691           if (t->type == CPP_EOF)
 692             break;
 693           else if (cpp_ideq (t, "_filbuf"))
 694             seen_filbuf++;
 695         }
 696
 697       if (seen_filbuf)
 698         {
 699           int need_filbuf = !SEEN (fn) && !REQUIRED (fn);
 700           struct fn_decl *flsbuf_fn = lookup_std_proto ("_flsbuf", 7);
 701           int need_flsbuf
 702             = flsbuf_fn && !SEEN (flsbuf_fn) && !REQUIRED (flsbuf_fn);
 703
 704           /* Append "_filbuf" and/or "_flsbuf" to the required functions.  */
 705           if (need_filbuf + need_flsbuf)
 706             {
 707               const char *new_list;
 708               if (need_filbuf)
 709                 SET_REQUIRED (fn);
 710               if (need_flsbuf)
 711                 SET_REQUIRED (flsbuf_fn);
 712               if (need_flsbuf && need_filbuf)
 713                 new_list = "_filbuf\0_flsbuf\0";
 714               else if (need_flsbuf)
 715                 new_list = "_flsbuf\0";
 716               else /* if (need_flsbuf) */
 717                 new_list = "_filbuf\0";
 718               add_symbols (ANSI_SYMBOL, new_list);
 719               required_unseen_count += need_filbuf + need_flsbuf;
 720             }
 721         }
 722     }
 723
 724   if (required_unseen_count + partial_count + required_other == 0)
 725     {
 726       if (verbose)
 727         fprintf (stderr, "%s: OK, nothing needs to be done.\n", inc_filename);
 728       exit (SUCCESS_EXIT_CODE);
 729     }
 730   if (!verbose)
 731     fprintf (stderr, "%s: fixing %s\n", progname, inc_filename);
 732   else
 733     {
 734       if (required_unseen_count)
 735         fprintf (stderr, "%s: %d missing function declarations.\n",
 736                  inc_filename, required_unseen_count);
 737       if (partial_count)
 738         fprintf (stderr, "%s: %d non-prototype function declarations.\n",
 739                  inc_filename, partial_count);
 740     }
 741 }
 742
 743 static void
 744 write_rbrac ()
 745 {
 746   struct fn_decl *fn;
 747   const char *cptr;
 748   struct symbol_list *cur_symbols;
 749
 750   if (required_unseen_count)
 751     {
 752 #ifdef NO_IMPLICIT_EXTERN_C
 753       fprintf (outf, "#ifdef __cplusplus\nextern \"C\" {\n#endif\n");
 754 #endif
 755     }
 756
 757   /* Now we print out prototypes for those functions that we haven't seen.  */
 758   for (cur_symbols = &symbol_table[0]; cur_symbols->names; cur_symbols++)
 759     {
 760       int if_was_emitted = 0;
 761       int name_len;
 762       cptr = cur_symbols->names;
 763       for ( ; (name_len = strlen (cptr)) != 0; cptr+= name_len + 1)
 764         {
 765           int macro_protect = 0;
 766
 767           if (cur_symbols->flags & MACRO_SYMBOL)
 768             continue;
 769
 770           fn = lookup_std_proto (cptr, name_len);
 771           if (fn == NULL || !REQUIRED (fn))
 772             continue;
 773
 774           if (!if_was_emitted)
 775             {
 776 /*            what about curses. ??? or _flsbuf/_filbuf ??? */
 777               if (cur_symbols->flags & ANSI_SYMBOL)
 778                 fprintf (outf,
 779          "#if defined(__USE_FIXED_PROTOTYPES__) || defined(__cplusplus) || defined (__STRICT_ANSI__)\n");
 780               else if (cur_symbols->flags & (POSIX1_SYMBOL|POSIX2_SYMBOL))
 781                 fprintf (outf,
 782        "#if defined(__USE_FIXED_PROTOTYPES__) || (defined(__cplusplus) \\\n\
 783     ? (!defined(__STRICT_ANSI__) || defined(_POSIX_SOURCE)) \\\n\
 784     : (defined(__STRICT_ANSI__) && defined(_POSIX_SOURCE)))\n");
 785               else if (cur_symbols->flags & XOPEN_SYMBOL)
 786                 {
 787                 fprintf (outf,
 788        "#if defined(__USE_FIXED_PROTOTYPES__) \\\n\
 789    || (defined(__STRICT_ANSI__) && defined(_XOPEN_SOURCE))\n");
 790                 }
 791               else if (cur_symbols->flags & XOPEN_EXTENDED_SYMBOL)
 792                 {
 793                 fprintf (outf,
 794        "#if defined(__USE_FIXED_PROTOTYPES__) \\\n\
 795    || (defined(__STRICT_ANSI__) && defined(_XOPEN_EXTENDED_SOURCE))\n");
 796                 }
 797               else
 798                 {
 799                   fatal ("internal error for function %s", fn->fname);
 800                 }
 801               if_was_emitted = 1;
 802             }
 803
 804           /* In the case of memmove, protect in case the application
 805              defines it as a macro before including the header.  */
 806           if (!strcmp (fn->fname, "memmove")
 807               || !strcmp (fn->fname, "putc")
 808               || !strcmp (fn->fname, "getc")
 809               || !strcmp (fn->fname, "vprintf")
 810               || !strcmp (fn->fname, "vfprintf")
 811               || !strcmp (fn->fname, "vsprintf")
 812               || !strcmp (fn->fname, "rewinddir")
 813               || !strcmp (fn->fname, "abort"))
 814             macro_protect = 1;
 815
 816           if (macro_protect)
 817             fprintf (outf, "#ifndef %s\n", fn->fname);
 818           fprintf (outf, "extern %s %s (%s);\n",
 819                    fn->rtype, fn->fname, fn->params);
 820           if (macro_protect)
 821             fprintf (outf, "#endif\n");
 822         }
 823       if (if_was_emitted)
 824         fprintf (outf,
 825                  "#endif /* defined(__USE_FIXED_PROTOTYPES__) || ... */\n");
 826     }
 827   if (required_unseen_count)
 828     {
 829 #ifdef NO_IMPLICIT_EXTERN_C
 830       fprintf (outf, "#ifdef __cplusplus\n}\n#endif\n");
 831 #endif
 832     }
 833
 834   switch (special_file_handling)
 835     {
 836     case errno_h:
 837       if (!seen_errno)
 838         fprintf (outf, "extern int errno;\n");
 839       break;
 840     case stdlib_h:
 841       if (!seen_EXIT_FAILURE)
 842         fprintf (outf, "#define EXIT_FAILURE 1\n");
 843       if (!seen_EXIT_SUCCESS)
 844         fprintf (outf, "#define EXIT_SUCCESS 0\n");
 845       break;
 846     case sys_stat_h:
 847       if (!seen_S_ISBLK && seen_S_IFBLK)
 848         fprintf (outf,
 849                  "#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)\n");
 850       if (!seen_S_ISCHR && seen_S_IFCHR)
 851         fprintf (outf,
 852                  "#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)\n");
 853       if (!seen_S_ISDIR && seen_S_IFDIR)
 854         fprintf (outf,
 855                  "#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)\n");
 856       if (!seen_S_ISFIFO && seen_S_IFIFO)
 857         fprintf (outf,
 858                  "#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)\n");
 859       if (!seen_S_ISLNK && seen_S_IFLNK)
 860         fprintf (outf,
 861                  "#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)\n");
 862       if (!seen_S_ISREG && seen_S_IFREG)
 863         fprintf (outf,
 864                  "#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)\n");
 865       break;
 866
 867     default:
 868       break;
 869     }
 870
 871 }
 872
 873 /* Returns 1 iff the file is properly protected from multiple inclusion:
 874    #ifndef PROTECT_NAME
 875    #define PROTECT_NAME
 876    #endif
 877
 878  */
 879
 880 #define INF_GET() (inf_ptr < inf_limit ? *(unsigned char *) inf_ptr++ : EOF)
 881 #define INF_UNGET(c) ((c)!=EOF && inf_ptr--)
 882
 883 static int
 884 inf_skip_spaces (c)
 885      int c;
 886 {
 887   for (;;)
 888     {
 889       if (c == ' ' || c == '\t')
 890         c = INF_GET ();
 891       else if (c == '/')
 892         {
 893           c = INF_GET ();
 894           if (c != '*')
 895             {
 896               (void) INF_UNGET (c);
 897               return '/';
 898             }
 899           c = INF_GET ();
 900           for (;;)
 901             {
 902               if (c == EOF)
 903                 return EOF;
 904               else if (c != '*')
 905                 {
 906                   if (c == '\n')
 907                     source_lineno++, lineno++;
 908                   c = INF_GET ();
 909                 }
 910               else if ((c = INF_GET ()) == '/')
 911                 return INF_GET ();
 912             }
 913         }
 914       else
 915         break;
 916     }
 917   return c;
 918 }
 919
 920 /* Read into STR from inf_buffer upto DELIM.  */
 921
 922 static int
 923 inf_read_upto (str, delim)
 924      sstring *str;
 925      int delim;
 926 {
 927   int ch;
 928   for (;;)
 929     {
 930       ch = INF_GET ();
 931       if (ch == EOF || ch == delim)
 932         break;
 933       SSTRING_PUT (str, ch);
 934     }
 935   MAKE_SSTRING_SPACE (str, 1);
 936   *str->ptr = 0;
 937   return ch;
 938 }
 939
 940 static int
 941 inf_scan_ident (s, c)
 942      sstring *s;
 943      int c;
 944 {
 945   s->ptr = s->base;
 946   if (ISIDST (c))
 947     {
 948       for (;;)
 949         {
 950           SSTRING_PUT (s, c);
 951           c = INF_GET ();
 952           if (c == EOF || !(ISIDNUM (c)))
 953             break;
 954         }
 955     }
 956   MAKE_SSTRING_SPACE (s, 1);
 957   *s->ptr = 0;
 958   return c;
 959 }
 960
 961 /* Returns 1 if the file is correctly protected against multiple
 962    inclusion, setting *ifndef_line to the line number of the initial #ifndef
 963    and setting *endif_line to the final #endif.
 964    Otherwise return 0.  */
 965
 966 static int
 967 check_protection (ifndef_line, endif_line)
 968      int *ifndef_line, *endif_line;
 969 {
 970   int c;
 971   int if_nesting = 1; /* Level of nesting of #if's */
 972   char *protect_name = NULL; /* Identifier following initial #ifndef */
 973   int define_seen = 0;
 974
 975   /* Skip initial white space (including comments).  */
 976   for (;; lineno++)
 977     {
 978       c = inf_skip_spaces (' ');
 979       if (c == EOF)
 980         return 0;
 981       if (c != '\n')
 982         break;
 983     }
 984   if (c != '#')
 985     return 0;
 986   c = inf_scan_ident (&buf, inf_skip_spaces (' '));
 987   if (SSTRING_LENGTH (&buf) == 0 || strcmp (buf.base, "ifndef") != 0)
 988     return 0;
 989
 990   /* So far so good: We've seen an initial #ifndef.  */
 991   *ifndef_line = lineno;
 992   c = inf_scan_ident (&buf, inf_skip_spaces (c));
 993   if (SSTRING_LENGTH (&buf) == 0 || c == EOF)
 994     return 0;
 995   protect_name = xstrdup (buf.base);
 996
 997   (void) INF_UNGET (c);
 998   c = inf_read_upto (&buf, '\n');
 999   if (c == EOF)
1000     return 0;
1001   lineno++;
1002
1003   for (;;)
1004     {
1005       c = inf_skip_spaces (' ');
1006       if (c == EOF)
1007         return 0;
1008       if (c == '\n')
1009         {
1010           lineno++;
1011           continue;
1012         }
1013       if (c != '#')
1014         goto skip_to_eol;
1015       c = inf_scan_ident (&buf, inf_skip_spaces (' '));
1016       if (SSTRING_LENGTH (&buf) == 0)
1017         ;
1018       else if (!strcmp (buf.base, "ifndef")
1019           || !strcmp (buf.base, "ifdef") || !strcmp (buf.base, "if"))
1020         {
1021           if_nesting++;
1022         }
1023       else if (!strcmp (buf.base, "endif"))
1024         {
1025           if_nesting--;
1026           if (if_nesting == 0)
1027             break;
1028         }
1029       else if (!strcmp (buf.base, "else"))
1030         {
1031           if (if_nesting == 1)
1032             return 0;
1033         }
1034       else if (!strcmp (buf.base, "define"))
1035         {
1036           c = inf_skip_spaces (c);
1037           c = inf_scan_ident (&buf, c);
1038           if (buf.base[0] > 0 && strcmp (buf.base, protect_name) == 0)
1039             define_seen = 1;
1040         }
1041     skip_to_eol:
1042       for (;;)
1043         {
1044           if (c == '\n' || c == EOF)
1045             break;
1046           c = INF_GET ();
1047         }
1048       if (c == EOF)
1049         return 0;
1050       lineno++;
1051     }
1052
1053   if (!define_seen)
1054      return 0;
1055   *endif_line = lineno;
1056   /* Skip final white space (including comments).  */
1057   for (;;)
1058     {
1059       c = inf_skip_spaces (' ');
1060       if (c == EOF)
1061         break;
1062       if (c != '\n')
1063         return 0;
1064     }
1065
1066   return 1;
1067 }
1068
1069 extern int main                 PARAMS ((int, char **));
1070
1071 int
1072 main (argc, argv)
1073      int argc;
1074      char **argv;
1075 {
1076   int inf_fd;
1077   struct stat sbuf;
1078   int c;
1079 #ifdef FIXPROTO_IGNORE_LIST
1080   int i;
1081 #endif
1082   const char *cptr;
1083   int ifndef_line;
1084   int endif_line;
1085   long to_read;
1086   long int inf_size;
1087   struct symbol_list *cur_symbols;
1088
1089   if (argv[0] && argv[0][0])
1090     {
1091       char *p;
1092
1093       progname = 0;
1094       for (p = argv[0]; *p; p++)
1095         if (*p == '/')
1096           progname = p;
1097       progname = progname ? progname+1 : argv[0];
1098     }
1099
1100   if (argc < 4)
1101     {
1102       fprintf (stderr, "%s: Usage: foo.h infile.h outfile.h options\n",
1103                progname);
1104       exit (FATAL_EXIT_CODE);
1105     }
1106
1107   inc_filename = argv[1];
1108   inc_filename_length = strlen (inc_filename);
1109
1110 #ifdef FIXPROTO_IGNORE_LIST
1111   for (i = 0; files_to_ignore[i] != NULL; i++)
1112     {
1113       const char *const ignore_name = files_to_ignore[i];
1114       int ignore_len = strlen (ignore_name);
1115       if (strncmp (inc_filename, ignore_name, ignore_len) == 0)
1116         {
1117           if (ignore_name[ignore_len-1] == '/'
1118               || inc_filename[ignore_len] == '\0')
1119             {
1120               if (verbose)
1121                 fprintf (stderr, "%s: ignoring %s\n", progname, inc_filename);
1122               exit (SUCCESS_EXIT_CODE);
1123             }
1124         }
1125
1126     }
1127 #endif
1128
1129   if (strcmp (inc_filename, "sys/stat.h") == 0)
1130     special_file_handling = sys_stat_h;
1131   else if (strcmp (inc_filename, "errno.h") == 0)
1132     special_file_handling = errno_h, required_other++;
1133   else if (strcmp (inc_filename, "stdlib.h") == 0)
1134     special_file_handling = stdlib_h, required_other+=2;
1135   else if (strcmp (inc_filename, "stdio.h") == 0)
1136     special_file_handling = stdio_h;
1137   include_entry = std_include_table;
1138   while (include_entry->name != NULL
1139          && ((strcmp (include_entry->name, CONTINUED) == 0)
1140              || strcmp (inc_filename, include_entry->name) != 0))
1141     include_entry++;
1142
1143   if (include_entry->name != NULL)
1144     {
1145       const struct std_include_entry *entry;
1146       cur_symbol_table_size = 0;
1147       for (entry = include_entry; ;)
1148         {
1149           if (entry->flags)
1150             add_symbols (entry->flags, entry->names);
1151           entry++;
1152           if (!entry->name || strcmp (entry->name, CONTINUED) != 0)
1153             break;
1154         }
1155     }
1156   else
1157     symbol_table[0].names = NULL;
1158
1159   /* Count and mark the prototypes required for this include file.  */
1160   for (cur_symbols = &symbol_table[0]; cur_symbols->names; cur_symbols++)
1161     {
1162       int name_len;
1163       if (cur_symbols->flags & MACRO_SYMBOL)
1164         continue;
1165       cptr = cur_symbols->names;
1166       for ( ; (name_len = strlen (cptr)) != 0; cptr+= name_len + 1)
1167         {
1168           struct fn_decl *fn = lookup_std_proto (cptr, name_len);
1169           required_unseen_count++;
1170           if (fn == NULL)
1171             fprintf (stderr, "Internal error:  No prototype for %s\n", cptr);
1172           else
1173             SET_REQUIRED (fn);
1174         }
1175     }
1176
1177   read_scan_file (argv[2], argc - 4, argv + 4);
1178
1179   inf_fd = open (argv[2], O_RDONLY, 0666);
1180   if (inf_fd < 0)
1181     {
1182       fprintf (stderr, "%s: Cannot open '%s' for reading -",
1183                progname, argv[2]);
1184       perror (NULL);
1185       exit (FATAL_EXIT_CODE);
1186     }
1187   if (fstat (inf_fd, &sbuf) < 0)
1188     {
1189       fprintf (stderr, "%s: Cannot get size of '%s' -", progname, argv[2]);
1190       perror (NULL);
1191       exit (FATAL_EXIT_CODE);
1192     }
1193   inf_size = sbuf.st_size;
1194   inf_buffer = (char *) xmalloc (inf_size + 2);
1195   inf_ptr = inf_buffer;
1196
1197   to_read = inf_size;
1198   while (to_read > 0)
1199     {
1200       long i = read (inf_fd, inf_buffer + inf_size - to_read, to_read);
1201       if (i < 0)
1202         {
1203           fprintf (stderr, "%s: Failed to read '%s' -", progname, argv[2]);
1204           perror (NULL);
1205           exit (FATAL_EXIT_CODE);
1206         }
1207       if (i == 0)
1208         {
1209           inf_size -= to_read;
1210           break;
1211         }
1212       to_read -= i;
1213     }
1214
1215   close (inf_fd);
1216
1217   /* Inf_size may have changed if read was short (as on VMS) */
1218   inf_buffer[inf_size] = '\n';
1219   inf_buffer[inf_size + 1] = '\0';
1220   inf_limit = inf_buffer + inf_size;
1221
1222   /* If file doesn't end with '\n', add one.  */
1223   if (inf_limit > inf_buffer && inf_limit[-1] != '\n')
1224     inf_limit++;
1225
1226   unlink (argv[3]);
1227   outf = fopen (argv[3], "w");
1228   if (outf == NULL)
1229     {
1230       fprintf (stderr, "%s: Cannot open '%s' for writing -",
1231                progname, argv[3]);
1232       perror (NULL);
1233       exit (FATAL_EXIT_CODE);
1234     }
1235
1236   lineno = 1;
1237
1238   if (check_protection (&ifndef_line, &endif_line))
1239     {
1240       lbrac_line = ifndef_line+1;
1241       rbrac_line = endif_line;
1242     }
1243   else
1244     {
1245       lbrac_line = 1;
1246       rbrac_line = -1;
1247     }
1248
1249   /* Reset input file.  */
1250   inf_ptr = inf_buffer;
1251   lineno = 1;
1252
1253   for (;;)
1254     {
1255       if (lineno == lbrac_line)
1256         write_lbrac ();
1257       if (lineno == rbrac_line)
1258         write_rbrac ();
1259       for (;;)
1260         {
1261           struct fn_decl *fn;
1262           c = INF_GET ();
1263           if (c == EOF)
1264             break;
1265           if (ISIDST (c))
1266             {
1267               c = inf_scan_ident (&buf, c);
1268               (void) INF_UNGET (c);
1269               fputs (buf.base, outf);
1270               fn = lookup_std_proto (buf.base, strlen (buf.base));
1271               /* We only want to edit the declaration matching the one
1272                  seen by scan-decls, as there can be multiple
1273                  declarations, selected by #ifdef __STDC__ or whatever.  */
1274               if (fn && fn->partial && fn->partial->line_seen == lineno)
1275                 {
1276                   c = inf_skip_spaces (' ');
1277                   if (c == EOF)
1278                     break;
1279                   if (c == '(')
1280                     {
1281                       c = inf_skip_spaces (' ');
1282                       if (c == ')')
1283                         {
1284                           fprintf (outf, " _PARAMS((%s))", fn->params);
1285                         }
1286                       else
1287                         {
1288                           putc ('(', outf);
1289                           (void) INF_UNGET (c);
1290                         }
1291                     }
1292                   else
1293                     fprintf (outf, " %c", c);
1294                 }
1295             }
1296           else
1297             {
1298               putc (c, outf);
1299               if (c == '\n')
1300                 break;
1301             }
1302         }
1303       if (c == EOF)
1304         break;
1305       lineno++;
1306     }
1307   if (rbrac_line < 0)
1308     write_rbrac ();
1309
1310   fclose (outf);
1311
1312   return 0;
1313 }
1314 \f
1315
1316 static void
1317 v_fatal (str, ap)
1318   const char * str;
1319   va_list ap;
1320 {
1321   fprintf (stderr, "%s: %s: ", progname, inc_filename);
1322   vfprintf (stderr, str, ap);
1323   fprintf (stderr, "\n");
1324
1325   exit (FATAL_EXIT_CODE);
1326 }
1327
1328 static void
1329 fatal (const char *str, ...)
1330 {
1331   va_list ap;
1332
1333   va_start (ap, str);
1334   v_fatal (str, ap);
1335   va_end (ap);
1336 }