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, 2004, 2006 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 #include "errors.h"
  83
  84 #ifdef TARGET_EXTRA_INCLUDES
  85 void
  86 TARGET_EXTRA_INCLUDES (const char *sysroot ATTRIBUTE_UNUSED,
  87                        const char *iprefix ATTRIBUTE_UNUSED,
  88                        int stdinc ATTRIBUTE_UNUSED)
  89 {
  90 }
  91 #endif
  92
  93 #ifdef TARGET_EXTRA_PRE_INCLUDES
  94 void
  95 TARGET_EXTRA_PRE_INCLUDES (const char *sysroot ATTRIBUTE_UNUSED,
  96                            const char *iprefix ATTRIBUTE_UNUSED,
  97                            int stdinc ATTRIBUTE_UNUSED)
  98 {
  99 }
 100 #endif
 101
 102 struct line_maps line_table;
 103
 104 sstring buf;
 105
 106 int verbose = 0;
 107 int partial_count = 0;
 108 int warnings = 0;
 109
 110 #if ADD_MISSING_EXTERN_C
 111 int missing_extern_C_count = 0;
 112 #endif
 113
 114 #include "xsys-protos.h"
 115
 116 #ifdef FIXPROTO_IGNORE_LIST
 117 /* This is a currently unused feature.  */
 118
 119 /* List of files and directories to ignore.
 120    A directory name (ending in '/') means ignore anything in that
 121    directory.  (It might be more efficient to do directory pruning
 122    earlier in fixproto, but this is simpler and easier to customize.) */
 123
 124 static const char *const files_to_ignore[] = {
 125   "X11/",
 126   FIXPROTO_IGNORE_LIST
 127   0
 128 };
 129 #endif
 130
 131 char *inf_buffer;
 132 char *inf_limit;
 133 char *inf_ptr;
 134 static const char *cur_file;
 135
 136 /* Certain standard files get extra treatment */
 137
 138 enum special_file
 139 {
 140   no_special,
 141 #ifdef errno_h
 142 #undef errno_h
 143 #endif
 144   errno_h,
 145 #ifdef stdio_h
 146 #undef stdio_h
 147 #endif
 148   stdio_h,
 149 #ifdef stdlib_h
 150 #undef stdlib_h
 151 #endif
 152   stdlib_h,
 153 #ifdef sys_stat_h
 154 #undef sys_stat_h
 155 #endif
 156   sys_stat_h
 157 };
 158
 159 /* A NAMELIST is a sequence of names, separated by '\0', and terminated
 160    by an empty name (i.e. by "\0\0").  */
 161
 162 typedef const char *namelist;
 163
 164 /* The following macros provide the bits for symbol_flags.  */
 165 typedef int symbol_flags;
 166
 167 /* Used to mark names defined in the ANSI/ISO C standard.  */
 168 #define ANSI_SYMBOL 1
 169
 170 /* We no longer massage include files for POSIX or XOPEN symbols,
 171    as there are now several versions of the POSIX and XOPEN standards,
 172    and it would be a maintenance nightmare for us to track them all.
 173    Better to be compatible with the system include files.  */
 174 /*#define ADD_MISSING_POSIX 1 */
 175 /*#define ADD_MISSING_XOPEN 1 */
 176
 177 #if ADD_MISSING_POSIX
 178 /* Used to mark names defined in the Posix.1 or Posix.2 standard.  */
 179 #define POSIX1_SYMBOL 2
 180 #define POSIX2_SYMBOL 4
 181 #else
 182 #define POSIX1_SYMBOL 0
 183 #define POSIX2_SYMBOL 0
 184 #endif
 185
 186 #if ADD_MISSING_XOPEN
 187 /* Used to mark names defined in X/Open Portability Guide.  */
 188 #define XOPEN_SYMBOL 8
 189 /* Used to mark names defined in X/Open UNIX Extensions.  */
 190 #define XOPEN_EXTENDED_SYMBOL 16
 191 #else
 192 #define XOPEN_SYMBOL 0
 193 #define XOPEN_EXTENDED_SYMBOL 0
 194 #endif
 195
 196 /* Used to indicate names that are not functions */
 197 #define MACRO_SYMBOL 512
 198
 199 struct symbol_list {
 200   symbol_flags flags;
 201   namelist names;
 202 };
 203
 204 #define SYMBOL_TABLE_SIZE 10
 205 struct symbol_list symbol_table[SYMBOL_TABLE_SIZE];
 206 int cur_symbol_table_size;
 207
 208 static void add_symbols (symbol_flags, namelist);
 209 static struct fn_decl *lookup_std_proto (const char *, int);
 210 static void write_lbrac (void);
 211 static void recognized_macro (const char *);
 212 static void check_macro_names (cpp_reader *, namelist);
 213 static void read_scan_file (char *, int, char **);
 214 static void write_rbrac (void);
 215 static int inf_skip_spaces (int);
 216 static int inf_read_upto (sstring *, int);
 217 static int inf_scan_ident (sstring *, int);
 218 static int check_protection (int *, int *);
 219 static void cb_file_change (cpp_reader *, const struct line_map *);
 220
 221 static void
 222 add_symbols (symbol_flags flags, namelist names)
 223 {
 224   symbol_table[cur_symbol_table_size].flags = flags;
 225   symbol_table[cur_symbol_table_size].names = names;
 226   cur_symbol_table_size++;
 227   if (cur_symbol_table_size >= SYMBOL_TABLE_SIZE)
 228     fatal ("too many calls to add_symbols");
 229   symbol_table[cur_symbol_table_size].names = NULL; /* Termination.  */
 230 }
 231
 232 struct std_include_entry {
 233   const char *const name;
 234   const symbol_flags flags;
 235   const namelist names;
 236 };
 237
 238 const char NONE[] = "";  /* The empty namelist.  */
 239
 240 /* Special name to indicate a continuation line in std_include_table.  */
 241 const char CONTINUED[] = "";
 242
 243 const struct std_include_entry *include_entry;
 244
 245 const struct std_include_entry std_include_table [] = {
 246   { "ctype.h", ANSI_SYMBOL,
 247       "isalnum\0isalpha\0iscntrl\0isdigit\0isgraph\0islower\0\
 248 isprint\0ispunct\0isspace\0isupper\0isxdigit\0tolower\0toupper\0" },
 249
 250   { "dirent.h", POSIX1_SYMBOL, "closedir\0opendir\0readdir\0rewinddir\0"},
 251
 252   { "errno.h", ANSI_SYMBOL|MACRO_SYMBOL, "errno\0" },
 253
 254   /* ANSI_SYMBOL is wrong, but ...  */
 255   { "curses.h", ANSI_SYMBOL, "box\0delwin\0endwin\0getcurx\0getcury\0initscr\0\
 256 mvcur\0mvwprintw\0mvwscanw\0newwin\0overlay\0overwrite\0\
 257 scroll\0subwin\0touchwin\0waddstr\0wclear\0wclrtobot\0wclrtoeol\0\
 258 waddch\0wdelch\0wdeleteln\0werase\0wgetch\0wgetstr\0winsch\0winsertln\0\
 259 wmove\0wprintw\0wrefresh\0wscanw\0wstandend\0wstandout\0" },
 260
 261   { "fcntl.h", POSIX1_SYMBOL, "creat\0fcntl\0open\0" },
 262
 263   /* Maybe also "getgrent fgetgrent setgrent endgrent" */
 264   { "grp.h", POSIX1_SYMBOL, "getgrgid\0getgrnam\0" },
 265
 266 /*{ "limit.h", ... provided by gcc }, */
 267
 268   { "locale.h", ANSI_SYMBOL, "localeconv\0setlocale\0" },
 269
 270   { "math.h", ANSI_SYMBOL,
 271       "acos\0asin\0atan\0atan2\0ceil\0cos\0cosh\0exp\0\
 272 fabs\0floor\0fmod\0frexp\0ldexp\0log10\0log\0modf\0pow\0sin\0sinh\0sqrt\0\
 273 tan\0tanh\0" },
 274
 275   { CONTINUED, ANSI_SYMBOL|MACRO_SYMBOL, "HUGE_VAL\0" },
 276
 277   { "pwd.h", POSIX1_SYMBOL, "getpwnam\0getpwuid\0" },
 278
 279   /* Left out siglongjmp sigsetjmp - these depend on sigjmp_buf.  */
 280   { "setjmp.h", ANSI_SYMBOL, "longjmp\0setjmp\0" },
 281
 282   /* Left out signal() - its prototype is too complex for us!
 283      Also left out "sigaction sigaddset sigdelset sigemptyset
 284      sigfillset sigismember sigpending sigprocmask sigsuspend"
 285      because these need sigset_t or struct sigaction.
 286      Most systems that provide them will also declare them.  */
 287   { "signal.h", ANSI_SYMBOL, "raise\0" },
 288   { CONTINUED, POSIX1_SYMBOL, "kill\0" },
 289
 290   { "stdio.h", ANSI_SYMBOL,
 291       "clearerr\0fclose\0feof\0ferror\0fflush\0fgetc\0fgetpos\0\
 292 fgets\0fopen\0fprintf\0fputc\0fputs\0fread\0freopen\0fscanf\0fseek\0\
 293 fsetpos\0ftell\0fwrite\0getc\0getchar\0gets\0perror\0\
 294 printf\0putc\0putchar\0puts\0remove\0rename\0rewind\0scanf\0setbuf\0\
 295 setvbuf\0sprintf\0sscanf\0vprintf\0vsprintf\0vfprintf\0tmpfile\0\
 296 tmpnam\0ungetc\0" },
 297   { CONTINUED, POSIX1_SYMBOL, "fdopen\0fileno\0" },
 298   { CONTINUED, POSIX2_SYMBOL, "pclose\0popen\0" },  /* I think ...  */
 299 /* Should perhaps also handle NULL, EOF, ... ? */
 300
 301   /* "div ldiv", - ignored because these depend on div_t, ldiv_t
 302      ignore these: "mblen mbstowcs mbstowc wcstombs wctomb"
 303      Left out getgroups, because SunOS4 has incompatible BSD and SVR4 versions.
 304      Should perhaps also add NULL */
 305   { "stdlib.h", ANSI_SYMBOL,
 306       "abort\0abs\0atexit\0atof\0atoi\0atol\0bsearch\0calloc\0\
 307 exit\0free\0getenv\0labs\0malloc\0qsort\0rand\0realloc\0\
 308 srand\0strtod\0strtol\0strtoul\0system\0" },
 309   { CONTINUED, ANSI_SYMBOL|MACRO_SYMBOL, "EXIT_FAILURE\0EXIT_SUCCESS\0" },
 310   { CONTINUED, POSIX1_SYMBOL, "putenv\0" },
 311
 312   { "string.h", ANSI_SYMBOL, "memchr\0memcmp\0memcpy\0memmove\0memset\0\
 313 strcat\0strchr\0strcmp\0strcoll\0strcpy\0strcspn\0strerror\0\
 314 strlen\0strncat\0strncmp\0strncpy\0strpbrk\0strrchr\0strspn\0strstr\0\
 315 strtok\0strxfrm\0" },
 316 /* Should perhaps also add NULL and size_t */
 317
 318   { "strings.h", XOPEN_EXTENDED_SYMBOL,
 319       "bcmp\0bcopy\0bzero\0ffs\0index\0rindex\0strcasecmp\0strncasecmp\0" },
 320
 321   { "strops.h", XOPEN_EXTENDED_SYMBOL, "ioctl\0" },
 322
 323   /* Actually, XPG4 does not seem to have <sys/ioctl.h>, but defines
 324      ioctl in <strops.h>.  However, many systems have it is sys/ioctl.h,
 325      and many systems do have <sys/ioctl.h> but not <strops.h>.  */
 326   { "sys/ioctl.h", XOPEN_EXTENDED_SYMBOL, "ioctl\0" },
 327
 328   { "sys/socket.h", XOPEN_EXTENDED_SYMBOL, "socket\0" },
 329
 330   { "sys/stat.h", POSIX1_SYMBOL,
 331       "chmod\0fstat\0mkdir\0mkfifo\0stat\0lstat\0umask\0" },
 332   { CONTINUED, POSIX1_SYMBOL|MACRO_SYMBOL,
 333       "S_ISDIR\0S_ISBLK\0S_ISCHR\0S_ISFIFO\0S_ISREG\0S_ISLNK\0S_IFDIR\0\
 334 S_IFBLK\0S_IFCHR\0S_IFIFO\0S_IFREG\0S_IFLNK\0" },
 335   { CONTINUED, XOPEN_EXTENDED_SYMBOL, "fchmod\0" },
 336
 337 #if 0
 338 /* How do we handle fd_set? */
 339   { "sys/time.h", XOPEN_EXTENDED_SYMBOL, "select\0" },
 340   { "sys/select.h", XOPEN_EXTENDED_SYMBOL /* fake */, "select\0" },
 341 #endif
 342
 343   { "sys/times.h", POSIX1_SYMBOL, "times\0" },
 344   /* "sys/types.h" add types (not in old g++-include) */
 345
 346   { "sys/utsname.h", POSIX1_SYMBOL, "uname\0" },
 347
 348   { "sys/wait.h", POSIX1_SYMBOL, "wait\0waitpid\0" },
 349   { CONTINUED, POSIX1_SYMBOL|MACRO_SYMBOL,
 350       "WEXITSTATUS\0WIFEXITED\0WIFSIGNALED\0WIFSTOPPED\0WSTOPSIG\0\
 351 WTERMSIG\0WNOHANG\0WNOTRACED\0" },
 352
 353   { "tar.h", POSIX1_SYMBOL, NONE },
 354
 355   { "termios.h", POSIX1_SYMBOL,
 356       "cfgetispeed\0cfgetospeed\0cfsetispeed\0cfsetospeed\0tcdrain\0tcflow\0tcflush\0tcgetattr\0tcsendbreak\0tcsetattr\0" },
 357
 358   { "time.h", ANSI_SYMBOL,
 359       "asctime\0clock\0ctime\0difftime\0gmtime\0localtime\0mktime\0strftime\0time\0" },
 360   { CONTINUED, POSIX1_SYMBOL, "tzset\0" },
 361
 362   { "unistd.h", POSIX1_SYMBOL,
 363       "_exit\0access\0alarm\0chdir\0chown\0close\0ctermid\0cuserid\0\
 364 dup\0dup2\0execl\0execle\0execlp\0execv\0execve\0execvp\0fork\0fpathconf\0\
 365 getcwd\0getegid\0geteuid\0getgid\0getlogin\0getpgrp\0getpid\0\
 366 getppid\0getuid\0isatty\0link\0lseek\0pathconf\0pause\0pipe\0read\0rmdir\0\
 367 setgid\0setpgid\0setsid\0setuid\0sleep\0sysconf\0tcgetpgrp\0tcsetpgrp\0\
 368 ttyname\0unlink\0write\0" },
 369   { CONTINUED, POSIX2_SYMBOL, "getopt\0" },
 370   { CONTINUED, XOPEN_EXTENDED_SYMBOL,
 371       "lockf\0gethostid\0gethostname\0readlink\0symlink\0" },
 372
 373   { "utime.h", POSIX1_SYMBOL, "utime\0" },
 374
 375   { NULL, 0, NONE }
 376 };
 377
 378 enum special_file special_file_handling = no_special;
 379
 380 /* They are set if the corresponding macro has been seen.  */
 381 /* The following are only used when handling sys/stat.h */
 382 int seen_S_IFBLK = 0, seen_S_ISBLK  = 0;
 383 int seen_S_IFCHR = 0, seen_S_ISCHR  = 0;
 384 int seen_S_IFDIR = 0, seen_S_ISDIR  = 0;
 385 int seen_S_IFIFO = 0, seen_S_ISFIFO = 0;
 386 int seen_S_IFLNK = 0, seen_S_ISLNK  = 0;
 387 int seen_S_IFREG = 0, seen_S_ISREG  = 0;
 388 /* The following are only used when handling errno.h */
 389 int seen_errno = 0;
 390 /* The following are only used when handling stdlib.h */
 391 int seen_EXIT_FAILURE = 0, seen_EXIT_SUCCESS = 0;
 392 \f
 393 struct obstack scan_file_obstack;
 394
 395 /* NOTE:  If you edit this, also edit gen-protos.c !! */
 396
 397 static struct fn_decl *
 398 lookup_std_proto (const char *name, int name_length)
 399 {
 400   int i = hashstr (name, name_length) % HASH_SIZE;
 401   int i0 = i;
 402   for (;;)
 403     {
 404       struct fn_decl *fn;
 405       if (hash_tab[i] == 0)
 406         return NULL;
 407       fn = &std_protos[hash_tab[i]];
 408       if ((int) strlen (fn->fname) == name_length
 409           && strncmp (fn->fname, name, name_length) == 0)
 410         return fn;
 411       i = (i+1) % HASH_SIZE;
 412       gcc_assert (i != i0);
 413     }
 414 }
 415
 416 char *inc_filename;
 417 int inc_filename_length;
 418 FILE *outf;
 419 sstring line;
 420
 421 int lbrac_line, rbrac_line;
 422
 423 int required_unseen_count = 0;
 424 int required_other = 0;
 425
 426 static void
 427 write_lbrac (void)
 428 {
 429   if (partial_count)
 430     {
 431       fprintf (outf, "#ifndef _PARAMS\n");
 432       fprintf (outf, "#if defined(__STDC__) || defined(__cplusplus)\n");
 433       fprintf (outf, "#define _PARAMS(ARGS) ARGS\n");
 434       fprintf (outf, "#else\n");
 435       fprintf (outf, "#define _PARAMS(ARGS) ()\n");
 436       fprintf (outf, "#endif\n#endif /* _PARAMS */\n");
 437     }
 438 }
 439
 440 struct partial_proto
 441 {
 442   struct partial_proto *next;
 443   struct fn_decl *fn;
 444   int line_seen;
 445 };
 446
 447 struct partial_proto *partial_proto_list = NULL;
 448
 449 struct partial_proto required_dummy_proto, seen_dummy_proto;
 450 #define REQUIRED(FN) ((FN)->partial == &required_dummy_proto)
 451 #define SET_REQUIRED(FN) ((FN)->partial = &required_dummy_proto)
 452 #define SET_SEEN(FN) ((FN)->partial = &seen_dummy_proto)
 453 #define SEEN(FN) ((FN)->partial == &seen_dummy_proto)
 454
 455 static void
 456 recognized_macro (const char *fname)
 457 {
 458   /* The original include file defines fname as a macro.  */
 459   struct fn_decl *fn = lookup_std_proto (fname, strlen (fname));
 460
 461   /* Since fname is a macro, don't require a prototype for it.  */
 462   if (fn)
 463     {
 464       if (REQUIRED (fn))
 465         required_unseen_count--;
 466       SET_SEEN (fn);
 467     }
 468
 469   switch (special_file_handling)
 470     {
 471     case errno_h:
 472       if (strcmp (fname, "errno") == 0 && !seen_errno)
 473         seen_errno = 1, required_other--;
 474       break;
 475     case stdlib_h:
 476       if (strcmp (fname, "EXIT_FAILURE") == 0 && !seen_EXIT_FAILURE)
 477         seen_EXIT_FAILURE = 1, required_other--;
 478       if (strcmp (fname, "EXIT_SUCCESS") == 0 && !seen_EXIT_SUCCESS)
 479         seen_EXIT_SUCCESS = 1, required_other--;
 480       break;
 481     case sys_stat_h:
 482       if (fname[0] == 'S' && fname[1] == '_')
 483         {
 484           if (strcmp (fname, "S_IFBLK") == 0) seen_S_IFBLK++;
 485           else if (strcmp (fname, "S_ISBLK") == 0) seen_S_ISBLK++;
 486           else if (strcmp (fname, "S_IFCHR") == 0) seen_S_IFCHR++;
 487           else if (strcmp (fname, "S_ISCHR") == 0) seen_S_ISCHR++;
 488           else if (strcmp (fname, "S_IFDIR") == 0) seen_S_IFDIR++;
 489           else if (strcmp (fname, "S_ISDIR") == 0) seen_S_ISDIR++;
 490           else if (strcmp (fname, "S_IFIFO") == 0) seen_S_IFIFO++;
 491           else if (strcmp (fname, "S_ISFIFO") == 0) seen_S_ISFIFO++;
 492           else if (strcmp (fname, "S_IFLNK") == 0) seen_S_IFLNK++;
 493           else if (strcmp (fname, "S_ISLNK") == 0) seen_S_ISLNK++;
 494           else if (strcmp (fname, "S_IFREG") == 0) seen_S_IFREG++;
 495           else if (strcmp (fname, "S_ISREG") == 0) seen_S_ISREG++;
 496         }
 497       break;
 498
 499     default:
 500       break;
 501     }
 502 }
 503
 504 void
 505 recognized_extern (const cpp_token *name)
 506 {
 507   switch (special_file_handling)
 508     {
 509     case errno_h:
 510       if (cpp_ideq (name, "errno"))
 511         seen_errno = 1, required_other--;
 512       break;
 513
 514     default:
 515       break;
 516     }
 517 }
 518
 519 /* Called by scan_decls if it saw a function definition for a function
 520    named FNAME.  KIND is 'I' for an inline function; 'F' if a normal
 521    function declaration preceded by 'extern "C"' (or nested inside
 522    'extern "C"' braces); or 'f' for other function declarations.  */
 523
 524 void
 525 recognized_function (const cpp_token *fname, unsigned int line, int kind,
 526                      int have_arg_list)
 527 {
 528   struct partial_proto *partial;
 529   int i;
 530   struct fn_decl *fn;
 531
 532   fn = lookup_std_proto ((const char *) NODE_NAME (fname->val.node),
 533                          NODE_LEN (fname->val.node));
 534
 535   /* Remove the function from the list of required function.  */
 536   if (fn)
 537     {
 538       if (REQUIRED (fn))
 539         required_unseen_count--;
 540       SET_SEEN (fn);
 541     }
 542
 543   /* If we have a full prototype, we're done.  */
 544   if (have_arg_list)
 545     return;
 546
 547   if (kind == 'I')  /* don't edit inline function */
 548     return;
 549
 550   /* If the partial prototype was included from some other file,
 551      we don't need to patch it up (in this run).  */
 552   i = strlen (cur_file);
 553   if (i < inc_filename_length
 554       || strcmp (inc_filename, cur_file + (i - inc_filename_length)) != 0)
 555     return;
 556
 557   if (fn == NULL)
 558     return;
 559   if (fn->params[0] == '\0')
 560     return;
 561
 562   /* We only have a partial function declaration,
 563      so remember that we have to add a complete prototype.  */
 564   partial_count++;
 565   partial = obstack_alloc (&scan_file_obstack, sizeof (struct partial_proto));
 566   partial->line_seen = line;
 567   partial->fn = fn;
 568   fn->partial = partial;
 569   partial->next = partial_proto_list;
 570   partial_proto_list = partial;
 571   if (verbose)
 572     {
 573       fprintf (stderr, "(%s: %s non-prototype function declaration.)\n",
 574                inc_filename, fn->fname);
 575     }
 576 }
 577
 578 /* For any name in NAMES that is defined as a macro,
 579    call recognized_macro on it.  */
 580
 581 static void
 582 check_macro_names (cpp_reader *pfile, namelist names)
 583 {
 584   size_t len;
 585   while (*names)
 586     {
 587       len = strlen (names);
 588       if (cpp_defined (pfile, (const unsigned char *)names, len))
 589         recognized_macro (names);
 590       names += len + 1;
 591     }
 592 }
 593
 594 static void
 595 cb_file_change (cpp_reader *pfile ATTRIBUTE_UNUSED,
 596                 const struct line_map *map)
 597 {
 598   /* Just keep track of current file name.  */
 599   cur_file = map == NULL ? NULL : map->to_file;
 600 }
 601
 602 static void
 603 read_scan_file (char *in_fname, int argc, char **argv)
 604 {
 605   cpp_reader *scan_in;
 606   cpp_callbacks *cb;
 607   cpp_options *options;
 608   struct fn_decl *fn;
 609   int i, strings_processed;
 610   struct symbol_list *cur_symbols;
 611
 612   obstack_init (&scan_file_obstack);
 613
 614   linemap_init (&line_table);
 615   scan_in = cpp_create_reader (CLK_GNUC89, NULL, &line_table);
 616   cb = cpp_get_callbacks (scan_in);
 617   cb->file_change = cb_file_change;
 618
 619   /* We are going to be scanning a header file out of its proper context,
 620      so ignore warnings and errors.  */
 621   options = cpp_get_options (scan_in);
 622   options->inhibit_warnings = 1;
 623   options->inhibit_errors = 1;
 624   cpp_post_options (scan_in);
 625
 626   if (!cpp_read_main_file (scan_in, in_fname))
 627     exit (FATAL_EXIT_CODE);
 628
 629   cpp_change_file (scan_in, LC_RENAME, "<built-in>");
 630   cpp_init_builtins (scan_in, true);
 631   cpp_change_file (scan_in, LC_RENAME, in_fname);
 632
 633   /* Process switches after builtins so -D can override them.  */
 634   for (i = 0; i < argc; i += strings_processed)
 635     {
 636       strings_processed = 0;
 637       if (argv[i][0] == '-')
 638         {
 639           if (argv[i][1] == 'I')
 640             {
 641               if (argv[i][2] != '\0')
 642                 {
 643                   strings_processed = 1;
 644                   add_path (xstrdup (argv[i] + 2), BRACKET, false, false);
 645                 }
 646               else if (i + 1 != argc)
 647                 {
 648                   strings_processed = 2;
 649                   add_path (xstrdup (argv[i + 1]), BRACKET, false, false);
 650                 }
 651             }
 652           else if (argv[i][1] == 'D')
 653             {
 654               if (argv[i][2] != '\0')
 655                 strings_processed = 1, cpp_define (scan_in, argv[i] + 2);
 656               else if (i + 1 != argc)
 657                 strings_processed = 2, cpp_define (scan_in, argv[i + 1]);
 658             }
 659         }
 660
 661       if (strings_processed == 0)
 662         break;
 663     }
 664
 665   if (i < argc)
 666     cpp_error (scan_in, CPP_DL_ERROR, "invalid option `%s'", argv[i]);
 667   if (cpp_errors (scan_in))
 668     exit (FATAL_EXIT_CODE);
 669
 670   register_include_chains (scan_in, NULL /* sysroot */, NULL /* iprefix */,
 671                            NULL /* imultilib */, true /* stdinc */,
 672                            false /* cxx_stdinc */, false /* verbose */);
 673
 674   /* We are scanning a system header, so mark it as such.  */
 675   cpp_make_system_header (scan_in, 1, 0);
 676
 677   scan_decls (scan_in, argc, argv);
 678   for (cur_symbols = &symbol_table[0]; cur_symbols->names; cur_symbols++)
 679     check_macro_names (scan_in, cur_symbols->names);
 680
 681   /* Traditionally, getc and putc are defined in terms of _filbuf and _flsbuf.
 682      If so, those functions are also required.  */
 683   if (special_file_handling == stdio_h
 684       && (fn = lookup_std_proto ("_filbuf", 7)) != NULL)
 685     {
 686       unsigned char getchar_call[] = "getchar();\n";
 687       int seen_filbuf = 0;
 688
 689       /* Scan the macro expansion of "getchar();".  */
 690       cpp_push_buffer (scan_in, getchar_call, sizeof(getchar_call) - 1,
 691                        /* from_stage3 */ true);
 692       for (;;)
 693         {
 694           const cpp_token *t = cpp_get_token (scan_in);
 695
 696           if (t->type == CPP_EOF)
 697             break;
 698           else if (cpp_ideq (t, "_filbuf"))
 699             seen_filbuf++;
 700         }
 701
 702       if (seen_filbuf)
 703         {
 704           int need_filbuf = !SEEN (fn) && !REQUIRED (fn);
 705           struct fn_decl *flsbuf_fn = lookup_std_proto ("_flsbuf", 7);
 706           int need_flsbuf
 707             = flsbuf_fn && !SEEN (flsbuf_fn) && !REQUIRED (flsbuf_fn);
 708
 709           /* Append "_filbuf" and/or "_flsbuf" to the required functions.  */
 710           if (need_filbuf + need_flsbuf)
 711             {
 712               const char *new_list;
 713               if (need_filbuf)
 714                 SET_REQUIRED (fn);
 715               if (need_flsbuf)
 716                 SET_REQUIRED (flsbuf_fn);
 717               if (need_flsbuf && need_filbuf)
 718                 new_list = "_filbuf\0_flsbuf\0";
 719               else if (need_flsbuf)
 720                 new_list = "_flsbuf\0";
 721               else /* if (need_flsbuf) */
 722                 new_list = "_filbuf\0";
 723               add_symbols (ANSI_SYMBOL, new_list);
 724               required_unseen_count += need_filbuf + need_flsbuf;
 725             }
 726         }
 727     }
 728
 729   if (required_unseen_count + partial_count + required_other == 0)
 730     {
 731       if (verbose)
 732         fprintf (stderr, "%s: OK, nothing needs to be done.\n", inc_filename);
 733       exit (SUCCESS_EXIT_CODE);
 734     }
 735   if (!verbose)
 736     fprintf (stderr, "%s: fixing %s\n", progname, inc_filename);
 737   else
 738     {
 739       if (required_unseen_count)
 740         fprintf (stderr, "%s: %d missing function declarations.\n",
 741                  inc_filename, required_unseen_count);
 742       if (partial_count)
 743         fprintf (stderr, "%s: %d non-prototype function declarations.\n",
 744                  inc_filename, partial_count);
 745     }
 746 }
 747
 748 static void
 749 write_rbrac (void)
 750 {
 751   struct fn_decl *fn;
 752   const char *cptr;
 753   struct symbol_list *cur_symbols;
 754
 755   if (required_unseen_count)
 756     {
 757 #ifdef NO_IMPLICIT_EXTERN_C
 758       fprintf (outf, "#ifdef __cplusplus\nextern \"C\" {\n#endif\n");
 759 #endif
 760     }
 761
 762   /* Now we print out prototypes for those functions that we haven't seen.  */
 763   for (cur_symbols = &symbol_table[0]; cur_symbols->names; cur_symbols++)
 764     {
 765       int if_was_emitted = 0;
 766       int name_len;
 767       cptr = cur_symbols->names;
 768       for ( ; (name_len = strlen (cptr)) != 0; cptr+= name_len + 1)
 769         {
 770           int macro_protect = 0;
 771
 772           if (cur_symbols->flags & MACRO_SYMBOL)
 773             continue;
 774
 775           fn = lookup_std_proto (cptr, name_len);
 776           if (fn == NULL || !REQUIRED (fn))
 777             continue;
 778
 779           if (!if_was_emitted)
 780             {
 781 /*            what about curses. ??? or _flsbuf/_filbuf ??? */
 782               if (cur_symbols->flags & ANSI_SYMBOL)
 783                 fprintf (outf,
 784          "#if defined(__USE_FIXED_PROTOTYPES__) || defined(__cplusplus) || defined (__STRICT_ANSI__)\n");
 785               else if (cur_symbols->flags & (POSIX1_SYMBOL|POSIX2_SYMBOL))
 786                 fprintf (outf,
 787        "#if defined(__USE_FIXED_PROTOTYPES__) || (defined(__cplusplus) \\\n\
 788     ? (!defined(__STRICT_ANSI__) || defined(_POSIX_SOURCE)) \\\n\
 789     : (defined(__STRICT_ANSI__) && defined(_POSIX_SOURCE)))\n");
 790               else if (cur_symbols->flags & XOPEN_SYMBOL)
 791                 {
 792                 fprintf (outf,
 793        "#if defined(__USE_FIXED_PROTOTYPES__) \\\n\
 794    || (defined(__STRICT_ANSI__) && defined(_XOPEN_SOURCE))\n");
 795                 }
 796               else if (cur_symbols->flags & XOPEN_EXTENDED_SYMBOL)
 797                 {
 798                 fprintf (outf,
 799        "#if defined(__USE_FIXED_PROTOTYPES__) \\\n\
 800    || (defined(__STRICT_ANSI__) && defined(_XOPEN_EXTENDED_SOURCE))\n");
 801                 }
 802               else
 803                 {
 804                   fatal ("internal error for function %s", fn->fname);
 805                 }
 806               if_was_emitted = 1;
 807             }
 808
 809           /* In the case of memmove, protect in case the application
 810              defines it as a macro before including the header.  */
 811           if (!strcmp (fn->fname, "memmove")
 812               || !strcmp (fn->fname, "putc")
 813               || !strcmp (fn->fname, "getc")
 814               || !strcmp (fn->fname, "vprintf")
 815               || !strcmp (fn->fname, "vfprintf")
 816               || !strcmp (fn->fname, "vsprintf")
 817               || !strcmp (fn->fname, "rewinddir")
 818               || !strcmp (fn->fname, "abort"))
 819             macro_protect = 1;
 820
 821           if (macro_protect)
 822             fprintf (outf, "#ifndef %s\n", fn->fname);
 823           fprintf (outf, "extern %s %s (%s);\n",
 824                    fn->rtype, fn->fname, fn->params);
 825           if (macro_protect)
 826             fprintf (outf, "#endif\n");
 827         }
 828       if (if_was_emitted)
 829         fprintf (outf,
 830                  "#endif /* defined(__USE_FIXED_PROTOTYPES__) || ... */\n");
 831     }
 832   if (required_unseen_count)
 833     {
 834 #ifdef NO_IMPLICIT_EXTERN_C
 835       fprintf (outf, "#ifdef __cplusplus\n}\n#endif\n");
 836 #endif
 837     }
 838
 839   switch (special_file_handling)
 840     {
 841     case errno_h:
 842       if (!seen_errno)
 843         fprintf (outf, "extern int errno;\n");
 844       break;
 845     case stdlib_h:
 846       if (!seen_EXIT_FAILURE)
 847         fprintf (outf, "#define EXIT_FAILURE 1\n");
 848       if (!seen_EXIT_SUCCESS)
 849         fprintf (outf, "#define EXIT_SUCCESS 0\n");
 850       break;
 851     case sys_stat_h:
 852       if (!seen_S_ISBLK && seen_S_IFBLK)
 853         fprintf (outf,
 854                  "#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)\n");
 855       if (!seen_S_ISCHR && seen_S_IFCHR)
 856         fprintf (outf,
 857                  "#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)\n");
 858       if (!seen_S_ISDIR && seen_S_IFDIR)
 859         fprintf (outf,
 860                  "#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)\n");
 861       if (!seen_S_ISFIFO && seen_S_IFIFO)
 862         fprintf (outf,
 863                  "#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)\n");
 864       if (!seen_S_ISLNK && seen_S_IFLNK)
 865         fprintf (outf,
 866                  "#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)\n");
 867       if (!seen_S_ISREG && seen_S_IFREG)
 868         fprintf (outf,
 869                  "#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)\n");
 870       break;
 871
 872     default:
 873       break;
 874     }
 875
 876 }
 877
 878 /* Returns 1 iff the file is properly protected from multiple inclusion:
 879    #ifndef PROTECT_NAME
 880    #define PROTECT_NAME
 881    #endif
 882
 883  */
 884
 885 #define INF_GET() (inf_ptr < inf_limit ? *(unsigned char *) inf_ptr++ : EOF)
 886 #define INF_UNGET(c) ((c)!=EOF && inf_ptr--)
 887
 888 static int
 889 inf_skip_spaces (int c)
 890 {
 891   for (;;)
 892     {
 893       if (c == ' ' || c == '\t')
 894         c = INF_GET ();
 895       else if (c == '/')
 896         {
 897           c = INF_GET ();
 898           if (c != '*')
 899             {
 900               (void) INF_UNGET (c);
 901               return '/';
 902             }
 903           c = INF_GET ();
 904           for (;;)
 905             {
 906               if (c == EOF)
 907                 return EOF;
 908               else if (c != '*')
 909                 {
 910                   if (c == '\n')
 911                     source_lineno++, lineno++;
 912                   c = INF_GET ();
 913                 }
 914               else if ((c = INF_GET ()) == '/')
 915                 return INF_GET ();
 916             }
 917         }
 918       else
 919         break;
 920     }
 921   return c;
 922 }
 923
 924 /* Read into STR from inf_buffer upto DELIM.  */
 925
 926 static int
 927 inf_read_upto (sstring *str, int delim)
 928 {
 929   int ch;
 930   for (;;)
 931     {
 932       ch = INF_GET ();
 933       if (ch == EOF || ch == delim)
 934         break;
 935       SSTRING_PUT (str, ch);
 936     }
 937   MAKE_SSTRING_SPACE (str, 1);
 938   *str->ptr = 0;
 939   return ch;
 940 }
 941
 942 static int
 943 inf_scan_ident (sstring *s, 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 (int *ifndef_line, int *endif_line)
 968 {
 969   int c;
 970   int if_nesting = 1; /* Level of nesting of #if's */
 971   char *protect_name = NULL; /* Identifier following initial #ifndef */
 972   int define_seen = 0;
 973
 974   /* Skip initial white space (including comments).  */
 975   for (;; lineno++)
 976     {
 977       c = inf_skip_spaces (' ');
 978       if (c == EOF)
 979         return 0;
 980       if (c != '\n')
 981         break;
 982     }
 983   if (c != '#')
 984     return 0;
 985   c = inf_scan_ident (&buf, inf_skip_spaces (' '));
 986   if (SSTRING_LENGTH (&buf) == 0 || strcmp (buf.base, "ifndef") != 0)
 987     return 0;
 988
 989   /* So far so good: We've seen an initial #ifndef.  */
 990   *ifndef_line = lineno;
 991   c = inf_scan_ident (&buf, inf_skip_spaces (c));
 992   if (SSTRING_LENGTH (&buf) == 0 || c == EOF)
 993     return 0;
 994   protect_name = xstrdup (buf.base);
 995
 996   (void) INF_UNGET (c);
 997   c = inf_read_upto (&buf, '\n');
 998   if (c == EOF)
 999     return 0;
1000   lineno++;
1001
1002   for (;;)
1003     {
1004       c = inf_skip_spaces (' ');
1005       if (c == EOF)
1006         return 0;
1007       if (c == '\n')
1008         {
1009           lineno++;
1010           continue;
1011         }
1012       if (c != '#')
1013         goto skip_to_eol;
1014       c = inf_scan_ident (&buf, inf_skip_spaces (' '));
1015       if (SSTRING_LENGTH (&buf) == 0)
1016         ;
1017       else if (!strcmp (buf.base, "ifndef")
1018           || !strcmp (buf.base, "ifdef") || !strcmp (buf.base, "if"))
1019         {
1020           if_nesting++;
1021         }
1022       else if (!strcmp (buf.base, "endif"))
1023         {
1024           if_nesting--;
1025           if (if_nesting == 0)
1026             break;
1027         }
1028       else if (!strcmp (buf.base, "else"))
1029         {
1030           if (if_nesting == 1)
1031             return 0;
1032         }
1033       else if (!strcmp (buf.base, "define"))
1034         {
1035           c = inf_skip_spaces (c);
1036           c = inf_scan_ident (&buf, c);
1037           if (buf.base[0] > 0 && strcmp (buf.base, protect_name) == 0)
1038             define_seen = 1;
1039         }
1040     skip_to_eol:
1041       for (;;)
1042         {
1043           if (c == '\n' || c == EOF)
1044             break;
1045           c = INF_GET ();
1046         }
1047       if (c == EOF)
1048         return 0;
1049       lineno++;
1050     }
1051
1052   if (!define_seen)
1053      return 0;
1054   *endif_line = lineno;
1055   /* Skip final white space (including comments).  */
1056   for (;;)
1057     {
1058       c = inf_skip_spaces (' ');
1059       if (c == EOF)
1060         break;
1061       if (c != '\n')
1062         return 0;
1063     }
1064
1065   return 1;
1066 }
1067
1068 extern int main (int, char **);
1069
1070 int
1071 main (int argc, char **argv)
1072 {
1073   int inf_fd;
1074   struct stat sbuf;
1075   int c;
1076 #ifdef FIXPROTO_IGNORE_LIST
1077   int i;
1078 #endif
1079   const char *cptr;
1080   int ifndef_line;
1081   int endif_line;
1082   long to_read;
1083   long int inf_size;
1084   struct symbol_list *cur_symbols;
1085
1086   progname = "fix-header";
1087   if (argv[0] && argv[0][0])
1088     {
1089       char *p;
1090
1091       progname = 0;
1092       for (p = argv[0]; *p; p++)
1093         if (*p == '/')
1094           progname = p;
1095       progname = progname ? progname+1 : argv[0];
1096     }
1097
1098   if (argc < 4)
1099     {
1100       fprintf (stderr, "%s: Usage: foo.h infile.h outfile.h options\n",
1101                progname);
1102       exit (FATAL_EXIT_CODE);
1103     }
1104
1105   inc_filename = argv[1];
1106   inc_filename_length = strlen (inc_filename);
1107
1108 #ifdef FIXPROTO_IGNORE_LIST
1109   for (i = 0; files_to_ignore[i] != NULL; i++)
1110     {
1111       const char *const ignore_name = files_to_ignore[i];
1112       int ignore_len = strlen (ignore_name);
1113       if (strncmp (inc_filename, ignore_name, ignore_len) == 0)
1114         {
1115           if (ignore_name[ignore_len-1] == '/'
1116               || inc_filename[ignore_len] == '\0')
1117             {
1118               if (verbose)
1119                 fprintf (stderr, "%s: ignoring %s\n", progname, inc_filename);
1120               exit (SUCCESS_EXIT_CODE);
1121             }
1122         }
1123
1124     }
1125 #endif
1126
1127   if (strcmp (inc_filename, "sys/stat.h") == 0)
1128     special_file_handling = sys_stat_h;
1129   else if (strcmp (inc_filename, "errno.h") == 0)
1130     special_file_handling = errno_h, required_other++;
1131   else if (strcmp (inc_filename, "stdlib.h") == 0)
1132     special_file_handling = stdlib_h, required_other+=2;
1133   else if (strcmp (inc_filename, "stdio.h") == 0)
1134     special_file_handling = stdio_h;
1135   include_entry = std_include_table;
1136   while (include_entry->name != NULL
1137          && ((strcmp (include_entry->name, CONTINUED) == 0)
1138              || strcmp (inc_filename, include_entry->name) != 0))
1139     include_entry++;
1140
1141   if (include_entry->name != NULL)
1142     {
1143       const struct std_include_entry *entry;
1144       cur_symbol_table_size = 0;
1145       for (entry = include_entry; ;)
1146         {
1147           if (entry->flags)
1148             add_symbols (entry->flags, entry->names);
1149           entry++;
1150           if (!entry->name || strcmp (entry->name, CONTINUED) != 0)
1151             break;
1152         }
1153     }
1154   else
1155     symbol_table[0].names = NULL;
1156
1157   /* Count and mark the prototypes required for this include file.  */
1158   for (cur_symbols = &symbol_table[0]; cur_symbols->names; cur_symbols++)
1159     {
1160       int name_len;
1161       if (cur_symbols->flags & MACRO_SYMBOL)
1162         continue;
1163       cptr = cur_symbols->names;
1164       for ( ; (name_len = strlen (cptr)) != 0; cptr+= name_len + 1)
1165         {
1166           struct fn_decl *fn = lookup_std_proto (cptr, name_len);
1167           required_unseen_count++;
1168           if (fn == NULL)
1169             fprintf (stderr, "Internal error:  No prototype for %s\n", cptr);
1170           else
1171             SET_REQUIRED (fn);
1172         }
1173     }
1174
1175   read_scan_file (argv[2], argc - 4, argv + 4);
1176
1177   inf_fd = open (argv[2], O_RDONLY, 0666);
1178   if (inf_fd < 0)
1179     {
1180       fprintf (stderr, "%s: Cannot open '%s' for reading -",
1181                progname, argv[2]);
1182       perror (NULL);
1183       exit (FATAL_EXIT_CODE);
1184     }
1185   if (fstat (inf_fd, &sbuf) < 0)
1186     {
1187       fprintf (stderr, "%s: Cannot get size of '%s' -", progname, argv[2]);
1188       perror (NULL);
1189       exit (FATAL_EXIT_CODE);
1190     }
1191   inf_size = sbuf.st_size;
1192   inf_buffer = XNEWVEC (char, inf_size + 2);
1193   inf_ptr = inf_buffer;
1194
1195   to_read = inf_size;
1196   while (to_read > 0)
1197     {
1198       long i = read (inf_fd, inf_buffer + inf_size - to_read, to_read);
1199       if (i < 0)
1200         {
1201           fprintf (stderr, "%s: Failed to read '%s' -", progname, argv[2]);
1202           perror (NULL);
1203           exit (FATAL_EXIT_CODE);
1204         }
1205       if (i == 0)
1206         {
1207           inf_size -= to_read;
1208           break;
1209         }
1210       to_read -= i;
1211     }
1212
1213   close (inf_fd);
1214
1215   /* Inf_size may have changed if read was short (as on VMS) */
1216   inf_buffer[inf_size] = '\n';
1217   inf_buffer[inf_size + 1] = '\0';
1218   inf_limit = inf_buffer + inf_size;
1219
1220   /* If file doesn't end with '\n', add one.  */
1221   if (inf_limit > inf_buffer && inf_limit[-1] != '\n')
1222     inf_limit++;
1223
1224   unlink (argv[3]);
1225   outf = fopen (argv[3], "w");
1226   if (outf == NULL)
1227     {
1228       fprintf (stderr, "%s: Cannot open '%s' for writing -",
1229                progname, argv[3]);
1230       perror (NULL);
1231       exit (FATAL_EXIT_CODE);
1232     }
1233
1234   lineno = 1;
1235
1236   if (check_protection (&ifndef_line, &endif_line))
1237     {
1238       lbrac_line = ifndef_line+1;
1239       rbrac_line = endif_line;
1240     }
1241   else
1242     {
1243       lbrac_line = 1;
1244       rbrac_line = -1;
1245     }
1246
1247   /* Reset input file.  */
1248   inf_ptr = inf_buffer;
1249   lineno = 1;
1250
1251   for (;;)
1252     {
1253       if (lineno == lbrac_line)
1254         write_lbrac ();
1255       if (lineno == rbrac_line)
1256         write_rbrac ();
1257       for (;;)
1258         {
1259           struct fn_decl *fn;
1260           c = INF_GET ();
1261           if (c == EOF)
1262             break;
1263           if (ISIDST (c))
1264             {
1265               c = inf_scan_ident (&buf, c);
1266               (void) INF_UNGET (c);
1267               fputs (buf.base, outf);
1268               fn = lookup_std_proto (buf.base, strlen (buf.base));
1269               /* We only want to edit the declaration matching the one
1270                  seen by scan-decls, as there can be multiple
1271                  declarations, selected by #ifdef __STDC__ or whatever.  */
1272               if (fn && fn->partial && fn->partial->line_seen == lineno)
1273                 {
1274                   c = inf_skip_spaces (' ');
1275                   if (c == EOF)
1276                     break;
1277                   if (c == '(')
1278                     {
1279                       c = inf_skip_spaces (' ');
1280                       if (c == ')')
1281                         {
1282                           fprintf (outf, " _PARAMS((%s))", fn->params);
1283                         }
1284                       else
1285                         {
1286                           putc ('(', outf);
1287                           (void) INF_UNGET (c);
1288                         }
1289                     }
1290                   else
1291                     fprintf (outf, " %c", c);
1292                 }
1293             }
1294           else
1295             {
1296               putc (c, outf);
1297               if (c == '\n')
1298                 break;
1299             }
1300         }
1301       if (c == EOF)
1302         break;
1303       lineno++;
1304     }
1305   if (rbrac_line < 0)
1306     write_rbrac ();
1307
1308   fclose (outf);
1309
1310   return 0;
1311 }