gcc/fix-header.c

   1 /* fix-header.c - Make C header file suitable for C++.
   2    Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 2, or (at your option) any
   7 later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* This program massages a system include file (such as stdio.h),
  19    into a form more conformant with ANSI/POSIX, and more suitable for C++:
  20
  21    * extern "C" { ... } braces are added (inside #ifndef __cplusplus),
  22    if they seem to be needed.  These prevent C++ compilers from name
  23    mangling the functions inside the braces.
  24
  25    * If an old-style incomplete function declaration is seen (without
  26    an argument list), and it is a "standard" function listed in
  27    the file sys-protos.h (and with a non-empty argument list), then
  28    the declaration is converted to a complete prototype by replacing
  29    the empty parameter list with the argument lust from sys-protos.h.
  30
  31    * The program can be given a list of (names of) required standard
  32    functions (such as fclose for stdio.h).  If a required function
  33    is not seen in the input, then a prototype for it will be
  34    written to the output.
  35
  36    * If all of the non-comment code of the original file is protected
  37    against multiple inclusion:
  38         #ifndef FOO
  39         #define FOO
  40         <body of include file>
  41         #endif
  42    then extra matter added to the include file is placed inside the <body>.
  43
  44    * If the input file is OK (nothing needs to be done);
  45    the output file is not written (nor removed if it exists).
  46
  47    There are also some special actions that are done for certain
  48    well-known standard include files:
  49
  50    * If argv[1] is "sys/stat.h", the Posix.1 macros
  51    S_ISBLK, S_ISCHR, S_ISDIR, S_ISFIFO, S_ISLNK, S_ISREG are added if
  52    they were missing, and the corresponding "traditional" S_IFxxx
  53    macros were defined.
  54
  55    * If argv[1] is "errno.h", errno is declared if it was missing.
  56
  57    * TODO:  The input file should be read complete into memory, because:
  58    a) it needs to be scanned twice anyway, and
  59    b) it would be nice to allow update in place.
  60
  61    Usage:
  62         fix-header FOO.H INFILE.H OUTFILE.H [OPTIONS]
  63    where:
  64    * FOO.H is the relative file name of the include file,
  65    as it would be #include'd by a C file.  (E.g. stdio.h)
  66    * INFILE.H is a full pathname for the input file (e.g. /usr/include/stdio.h)
  67    * OUTFILE.H is the full pathname for where to write the output file,
  68    if anything needs to be done.  (e.g. ./include/stdio.h)
  69    * OPTIONS are such as you would pass to cpp.
  70
  71    Written by Per Bothner <bothner@cygnus.com>, July 1993. */
  72
  73 #include <stdio.h>
  74 #include <ctype.h>
  75 #include "hconfig.h"
  76 #include "obstack.h"
  77 #include "scan.h"
  78 #include "cpplib.h"
  79 #ifndef O_RDONLY
  80 #define O_RDONLY 0
  81 #endif
  82
  83 #if !__STDC__
  84 #define const /* nothing */
  85 #endif
  86
  87 sstring buf;
  88
  89 int verbose = 0;
  90 int partial_count = 0;
  91 int warnings = 0;
  92
  93 /* We no longer need to add extern "C", because cpp implicitly
  94    forces the standard include files to be treated as C.  */
  95 /*#define ADD_MISSING_EXTERN_C 1 */
  96
  97 #if ADD_MISSING_EXTERN_C
  98 int missing_extern_C_count = 0;
  99 #endif
 100 int missing_errno = 0;
 101
 102 #include "xsys-protos.h"
 103
 104 #ifdef FIXPROTO_IGNORE_LIST
 105 /* This is a currently unused feature. */
 106
 107 /* List of files and directories to ignore.
 108    A directory name (ending in '/') means ignore anything in that
 109    directory.  (It might be more efficient to do directory pruning
 110    earlier in fixproto, but this is simpler and easier to customize.) */
 111
 112 static char *files_to_ignore[] = {
 113   "X11/",
 114   FIXPROTO_IGNORE_LIST
 115   0
 116 };
 117 #endif
 118
 119 char *inf_buffer;
 120 char *inf_limit;
 121 char *inf_ptr;
 122
 123 /* Certain standard files get extra treatment */
 124
 125 enum special_file
 126 {
 127   no_special,
 128   errno_h,
 129   stdio_h,
 130   sys_stat_h
 131 };
 132
 133 /* A NAMELIST is a sequence of names, separated by '\0', and terminated
 134    by an empty name (i.e. by "\0\0"). */
 135
 136 typedef const char* namelist;
 137
 138 struct std_include_entry {
 139   const char *name;
 140   namelist required;
 141   namelist extra;
 142   int special;
 143 };
 144
 145 /* End of namelist NAMES. */
 146
 147 namelist
 148 namelist_end (names)
 149      namelist names;
 150 {
 151   register namelist ptr;
 152   for (ptr = names; ; ptr++)
 153     {
 154       if (*ptr == '\0')
 155         {
 156           ptr++;
 157           if (*ptr == '\0')
 158             return ptr;
 159         }
 160     }
 161 }
 162
 163 const char NONE[] = "";
 164
 165 struct std_include_entry *include_entry;
 166
 167 struct std_include_entry std_include_table [] = {
 168   { "ctype.h",
 169       "isalnum\0isalpha\0iscntrl\0isdigit\0isgraph\0islower\0\
 170 isprint\0ispunct\0isspace\0isupper\0isxdigit\0tolower\0toupper\0", NONE },
 171
 172   { "dirent.h", "closedir\0opendir\0readdir\0rewinddir\0", NONE},
 173
 174   { "errno.h", NONE, "errno\0" },
 175
 176   { "curses.h", "box\0delwin\0endwin\0getcurx\0getcury\0initscr\0\
 177 mvcur\0mvwprintw\0mvwscanw\0newwin\0overlay\0overwrite\0\
 178 scroll\0subwin\0touchwin\0waddstr\0wclear\0wclrtobot\0wclrtoeol\0\
 179 waddch\0wdelch\0wdeleteln\0werase\0wgetch\0wgetstr\0winsch\0winsertln\0\
 180 wmove\0wprintw\0wrefresh\0wscanw\0wstandend\0wstandout\0", NONE },
 181
 182   { "fcntl.h", "creat\0fcntl\0open\0", NONE },
 183
 184   /* Maybe also "getgrent fgetgrent setgrent endgrent" */
 185   { "grp.h", "getgrgid\0getgrnam\0", NONE },
 186
 187 /*{ "limit.h", ... provided by gcc }, */
 188
 189   { "locale.h", "localeconv\0setlocale\0", NONE },
 190
 191   { "math.h", "acos\0asin\0atan\0atan2\0ceil\0cos\0cosh\0exp\0\
 192 fabs\0floor\0fmod\0frexp\0ldexp\0log10\0log\0modf\0pow\0sin\0sinh\0sqrt\0\
 193 tan\0tanh\0", "HUGE_VAL\0" },
 194
 195   { "pwd.h", "getpwnam\0getpwuid\0", NONE },
 196
 197   /* Left out siglongjmp sigsetjmp - these depend on sigjmp_buf. */
 198   { "setjmp.h", "longjmp\0setjmp\0", NONE },
 199
 200   /* Left out signal() - its prototype is too complex for us!
 201      Also left out "sigaction sigaddset sigdelset sigemptyset
 202      sigfillset sigismember sigpending sigprocmask sigsuspend"
 203      because these need sigset_t or struct sigaction.
 204      Most systems that provide them will also declare them. */
 205   { "signal.h", "kill\0raise\0", NONE },
 206
 207   { "stdio.h", "clearerr\0fclose\0feof\0ferror\0fflush\0fgetc\0fgetpos\0\
 208 fgets\0fopen\0fprintf\0fputc\0fputs\0fread\0freopen\0fscanf\0fseek\0\
 209 fsetpos\0ftell\0fwrite\0getc\0getchar\0gets\0pclose\0perror\0popen\0\
 210 printf\0putc\0putchar\0puts\0remove\0rename\0rewind\0scanf\0setbuf\0\
 211 setvbuf\0sprintf\0sscanf\0vprintf\0vsprintf\0vfprintf\0tmpfile\0\
 212 tmpnam\0ungetc\0", NONE },
 213 /* Should perhaps also handle NULL, EOF, ... ? */
 214
 215   /* "div ldiv", - ignored because these depend on div_t, ldiv_t
 216      ignore these: "mblen mbstowcs mbstowc wcstombs wctomb"
 217      Left out getgroups, because SunOS4 has incompatible BSD and SVR4 versions.
 218      Should perhaps also add NULL */
 219   { "stdlib.h", "abort\0abs\0atexit\0atof\0atoi\0atol\0bsearch\0calloc\0\
 220 exit\0free\0getenv\0labs\0malloc\0putenv\0qsort\0rand\0realloc\0\
 221 srand\0strtod\0strtol\0strtoul\0system\0", NONE },
 222
 223   { "string.h", "memchr\0memcmp\0memcpy\0memmove\0memset\0\
 224 strcat\0strchr\0strcmp\0strcoll\0strcpy\0strcspn\0strerror\0\
 225 strlen\0strncat\0strncmp\0strncpy\0strpbrk\0strrchr\0strspn\0strstr\0\
 226 strtok\0strxfrm\0", NONE },
 227 /* Should perhaps also add NULL and size_t */
 228
 229   { "sys/stat.h", "chmod\0fstat\0mkdir\0mkfifo\0stat\0lstat\0umask\0",
 230       "S_ISDIR\0S_ISBLK\0S_ISCHR\0S_ISFIFO\0S_ISREG\0S_ISLNK\0S_IFDIR\0\
 231 S_IFBLK\0S_IFCHR\0S_IFIFO\0S_IFREG\0S_IFLNK\0" },
 232
 233   { "sys/times.h", "times\0", NONE },
 234   /* "sys/types.h" add types (not in old g++-include) */
 235
 236   { "sys/utsname.h", "uname\0", NONE },
 237
 238   { "sys/wait.h", "wait\0waitpid\0",
 239       "WEXITSTATUS\0WIFEXITED\0WIFSIGNALED\0WIFSTOPPED\0WSTOPSIG\0\
 240 WTERMSIG\0WNOHANG\0WNOTRACED\0" },
 241
 242   { "tar.h", NONE, NONE },
 243
 244   { "termios.h", "cfgetispeed\0cfgetospeed\0cfsetispeed\0cfsetospeed\0tcdrain\0tcflow\0tcflush\0tcgetattr\0tcsendbreak\0tcsetattr\0", NONE },
 245
 246   { "time.h", "asctime\0clock\0ctime\0difftime\0gmtime\0localtime\0mktime\0strftime\0time\0tzset\0", NONE },
 247
 248   { "unistd.h", "_exit\0access\0alarm\0chdir\0chown\0close\0ctermid\0cuserid\0\
 249 dup\0dup2\0execl\0execle\0execlp\0execv\0execve\0execvp\0fork\0fpathconf\0\
 250 getcwd\0getegid\0geteuid\0getgid\0getlogin\0getopt\0getpgrp\0getpid\0\
 251 getppid\0getuid\0isatty\0link\0lseek\0pathconf\0pause\0pipe\0read\0rmdir\0\
 252 setgid\0setpgid\0setsid\0setuid\0sleep\0sysconf\0tcgetpgrp\0tcsetpgrp\0\
 253 ttyname\0unlink\0write\0", NONE },
 254
 255   { 0, NONE, NONE }
 256 };
 257
 258 enum special_file special_file_handling = no_special;
 259
 260 /* The following are only used when handling sys/stat.h */
 261 /* They are set if the corresponding macro has been seen. */
 262 int seen_S_IFBLK = 0, seen_S_ISBLK  = 0;
 263 int seen_S_IFCHR = 0, seen_S_ISCHR  = 0;
 264 int seen_S_IFDIR = 0, seen_S_ISDIR  = 0;
 265 int seen_S_IFIFO = 0, seen_S_ISFIFO = 0;
 266 int seen_S_IFLNK = 0, seen_S_ISLNK  = 0;
 267 int seen_S_IFREG = 0, seen_S_ISREG  = 0;
 268 \f
 269 /* Wrapper around free, to avoid prototype clashes. */
 270
 271 void
 272 xfree (ptr)
 273      char *ptr;
 274 {
 275   free (ptr);
 276 }
 277
 278 /* Avoid error if config defines abort as fancy_abort.
 279    It's not worth "really" implementing this because ordinary
 280    compiler users never run fix-header.  */
 281
 282 void
 283 fancy_abort ()
 284 {
 285   abort ();
 286 }
 287 \f
 288 #define obstack_chunk_alloc xmalloc
 289 #define obstack_chunk_free xfree
 290 struct obstack scan_file_obstack;
 291
 292 /* NOTE:  If you edit this, also edit gen-protos.c !! */
 293 struct fn_decl *
 294 lookup_std_proto (name, name_length)
 295      const char *name;
 296      int name_length;
 297 {
 298   int i = hashf (name, name_length, HASH_SIZE);
 299   int i0 = i;
 300   for (;;)
 301     {
 302       struct fn_decl *fn;
 303       if (hash_tab[i] == 0)
 304         return NULL;
 305       fn = &std_protos[hash_tab[i]];
 306       if (strlen (fn->fname) == name_length
 307           && strncmp (fn->fname, name, name_length) == 0)
 308         return fn;
 309       i = (i+1) % HASH_SIZE;
 310       if (i == i0)
 311         abort ();
 312     }
 313 }
 314
 315 char *inc_filename;
 316 int inc_filename_length;
 317 char *progname = "fix-header";
 318 FILE *outf;
 319 sstring line;
 320
 321 int lbrac_line, rbrac_line;
 322
 323 namelist required_functions_list;
 324 int required_unseen_count = 0;
 325
 326 void
 327 write_lbrac ()
 328 {
 329
 330 #if ADD_MISSING_EXTERN_C
 331   if (missing_extern_C_count + required_unseen_count > 0)
 332     fprintf (outf, "#ifdef __cplusplus\nextern \"C\" {\n#endif\n");
 333 #endif
 334
 335   if (partial_count)
 336     {
 337       fprintf (outf, "#ifndef _PARAMS\n");
 338       fprintf (outf, "#if defined(__STDC__) || defined(__cplusplus)\n");
 339       fprintf (outf, "#define _PARAMS(ARGS) ARGS\n");
 340       fprintf (outf, "#else\n");
 341       fprintf (outf, "#define _PARAMS(ARGS) ()\n");
 342       fprintf (outf, "#endif\n#endif /* _PARAMS */\n");
 343     }
 344 }
 345
 346 struct partial_proto
 347 {
 348   struct partial_proto *next;
 349   char *fname;  /* name of function */
 350   char *rtype;  /* return type */
 351   struct fn_decl *fn;
 352   int line_seen;
 353 };
 354
 355 struct partial_proto *partial_proto_list = NULL;
 356
 357 struct partial_proto required_dummy_proto, seen_dummy_proto;
 358 #define REQUIRED(FN) ((FN)->partial == &required_dummy_proto)
 359 #define SET_REQUIRED(FN) ((FN)->partial = &required_dummy_proto)
 360 #define SET_SEEN(FN) ((FN)->partial = &seen_dummy_proto)
 361 #define SEEN(FN) ((FN)->partial == &seen_dummy_proto)
 362
 363 void
 364 recognized_macro (fname)
 365      char *fname;
 366 {
 367   /* The original include file defines fname as a macro. */
 368   struct fn_decl *fn = lookup_std_proto (fname, strlen (fname));
 369
 370   /* Since fname is a macro, don't require a prototype for it. */
 371   if (fn)
 372     {
 373       if (REQUIRED (fn))
 374         required_unseen_count--;
 375       SET_SEEN (fn);
 376     }
 377
 378   switch (special_file_handling)
 379     {
 380     case errno_h:
 381       if (strcmp (fname, "errno") == 0) missing_errno = 0;
 382       break;
 383     case sys_stat_h:
 384       if (fname[0] == 'S' && fname[1] == '_')
 385         {
 386           if (strcmp (fname, "S_IFBLK") == 0) seen_S_IFBLK++;
 387           else if (strcmp (fname, "S_ISBLK") == 0) seen_S_ISBLK++;
 388           else if (strcmp (fname, "S_IFCHR") == 0) seen_S_IFCHR++;
 389           else if (strcmp (fname, "S_ISCHR") == 0) seen_S_ISCHR++;
 390           else if (strcmp (fname, "S_IFDIR") == 0) seen_S_IFDIR++;
 391           else if (strcmp (fname, "S_ISDIR") == 0) seen_S_ISDIR++;
 392           else if (strcmp (fname, "S_IFIFO") == 0) seen_S_IFIFO++;
 393           else if (strcmp (fname, "S_ISFIFO") == 0) seen_S_ISFIFO++;
 394           else if (strcmp (fname, "S_IFLNK") == 0) seen_S_IFLNK++;
 395           else if (strcmp (fname, "S_ISLNK") == 0) seen_S_ISLNK++;
 396           else if (strcmp (fname, "S_IFREG") == 0) seen_S_IFREG++;
 397           else if (strcmp (fname, "S_ISREG") == 0) seen_S_ISREG++;
 398         }
 399     }
 400 }
 401
 402 void
 403 recognized_extern (name, name_length, type, type_length)
 404      char *name;
 405      char *type;
 406      int name_length, type_length;
 407 {
 408   switch (special_file_handling)
 409     {
 410     case errno_h:
 411       if (strncmp (name, "errno", name_length) == 0) missing_errno = 0;
 412       break;
 413     }
 414 }
 415
 416 /* Called by scan_decls if it saw a function definition for a function
 417    named FNAME, with return type RTYPE, and argument list ARGS,
 418    in source file FILE_SEEN on line LINE_SEEN.
 419    KIND is 'I' for an inline function;
 420    'F' if a normal function declaration preceded by 'extern "C"'
 421    (or nested inside 'extern "C"' braces); or
 422    'f' for other function declarations. */
 423
 424 void
 425 recognized_function (fname, fname_length,
 426                      kind, rtype, rtype_length,
 427                      have_arg_list, file_seen, line_seen)
 428      char *fname;
 429      int fname_length;
 430      int kind; /* One of 'f' 'F' or 'I' */
 431      char *rtype;
 432      int rtype_length;
 433      int have_arg_list;
 434      char *file_seen;
 435      int line_seen;
 436 {
 437   struct partial_proto *partial;
 438   int i;
 439   struct fn_decl *fn;
 440 #if ADD_MISSING_EXTERN_C
 441   if (kind == 'f')
 442     missing_extern_C_count++;
 443 #endif
 444
 445   fn = lookup_std_proto (fname, fname_length);
 446
 447   /* Remove the function from the list of required function. */
 448   if (fn)
 449     {
 450       if (REQUIRED (fn))
 451         required_unseen_count--;
 452       SET_SEEN (fn);
 453     }
 454
 455   /* If we have a full prototype, we're done. */
 456   if (have_arg_list)
 457     return;
 458
 459   if (kind == 'I')  /* don't edit inline function */
 460     return;
 461
 462   /* If the partial prototype was included from some other file,
 463      we don't need to patch it up (in this run). */
 464   i = strlen (file_seen);
 465   if (i < inc_filename_length
 466       || strcmp (inc_filename, file_seen + (i - inc_filename_length)) != 0)
 467     return;
 468
 469   if (fn == NULL)
 470     return;
 471   if (fn->params[0] == '\0' || strcmp (fn->params, "void") == 0)
 472     return;
 473
 474   /* We only have a partial function declaration,
 475      so remember that we have to add a complete prototype. */
 476   partial_count++;
 477   partial = (struct partial_proto*)
 478     obstack_alloc (&scan_file_obstack, sizeof (struct partial_proto));
 479   partial->fname = obstack_alloc (&scan_file_obstack, fname_length + 1);
 480   bcopy (fname, partial->fname, fname_length);
 481   partial->fname[fname_length] = 0;
 482   partial->rtype = obstack_alloc (&scan_file_obstack, rtype_length + 1);
 483   sprintf (partial->rtype, "%.*s", rtype_length, rtype);
 484   partial->line_seen = line_seen;
 485   partial->fn = fn;
 486   fn->partial = partial;
 487   partial->next = partial_proto_list;
 488   partial_proto_list = partial;
 489   if (verbose)
 490     {
 491       fprintf (stderr, "(%s: %s non-prototype function declaration.)\n",
 492                inc_filename, partial->fname);
 493     }
 494 }
 495
 496 /* For any name in NAMES that is defined as a macro,
 497    call recognized_macro on it. */
 498
 499 void
 500 check_macro_names (pfile, names)
 501      struct parse_file *pfile;
 502      namelist names;
 503 {
 504   while (*names)
 505     {
 506       if (cpp_lookup (pfile, names, -1, -1))
 507         recognized_macro (names);
 508       names += strlen (names) + 1;
 509     }
 510 }
 511
 512 void
 513 read_scan_file (in_fname, argc, argv)
 514      char *in_fname;
 515      int argc;
 516      char **argv;
 517 {
 518   cpp_reader scan_in;
 519   cpp_options scan_options;
 520   struct fn_decl *fn;
 521   int i;
 522
 523   obstack_init (&scan_file_obstack);
 524
 525   init_parse_file (&scan_in);
 526   scan_in.data = &scan_options;
 527   init_parse_options (&scan_options);
 528   i = cpp_handle_options (&scan_in, argc, argv);
 529   if (i < argc)
 530     fatal ("Invalid option `%s'", argv[i]);
 531   push_parse_file (&scan_in, in_fname);
 532   CPP_OPTIONS (&scan_in)->no_line_commands = 1;
 533
 534   scan_decls (&scan_in, argc, argv);
 535   check_macro_names (&scan_in, include_entry->required);
 536   check_macro_names (&scan_in, include_entry->extra);
 537
 538   if (verbose && (scan_in.errors + warnings) > 0)
 539     fprintf (stderr, "(%s: %d errors and %d warnings from cpp)\n",
 540              inc_filename, scan_in.errors, warnings);
 541   if (scan_in.errors)
 542     exit (0);
 543
 544   /* Traditionally, getc and putc are defined in terms of _filbuf and _flsbuf.
 545      If so, those functions are also required. */
 546   if (special_file_handling == stdio_h
 547       && (fn = lookup_std_proto ("_filbuf", 7)) != NULL)
 548     {
 549       static char getchar_call[] = "getchar();";
 550       cpp_buffer *buf =
 551         cpp_push_buffer (&scan_in, getchar_call, sizeof(getchar_call) - 1);
 552       int old_written = CPP_WRITTEN (&scan_in);
 553       int seen_filbuf = 0;
 554
 555       /* Scan the macro expansion of "getchar();". */
 556       for (;;)
 557         {
 558           enum cpp_token token = cpp_get_token (&scan_in);
 559           int length = CPP_WRITTEN (&scan_in) - old_written;
 560           CPP_SET_WRITTEN (&scan_in, old_written);
 561           if (token == CPP_EOF) /* Should not happen ... */
 562             break;
 563           if (token == CPP_POP && CPP_BUFFER (&scan_in) == buf)
 564             {
 565               cpp_pop_buffer (&scan_in);
 566               break;
 567             }
 568           if (token == CPP_NAME && length == 7
 569               && strcmp ("_filbuf", scan_in.token_buffer + old_written) == 0)
 570             seen_filbuf++;
 571         }
 572       if (seen_filbuf)
 573         {
 574           int need_filbuf = !SEEN (fn) && !REQUIRED (fn);
 575           struct fn_decl *flsbuf_fn = lookup_std_proto ("_flsbuf", 7);
 576           int need_flsbuf
 577             = flsbuf_fn && !SEEN (flsbuf_fn) && !REQUIRED (flsbuf_fn);
 578
 579           /* Append "_filbuf" and/or "_flsbuf" to end of
 580              required_functions_list. */
 581           if (need_filbuf + need_flsbuf)
 582             {
 583               int old_len = namelist_end (required_functions_list)
 584                 - required_functions_list;
 585               char *new_list = (char*) xmalloc (old_len + 20);
 586               bcopy (required_functions_list, new_list, old_len);
 587               if (need_filbuf)
 588                 {
 589                   strcpy (new_list + old_len, "_filbuf");
 590                   old_len += 8;
 591                   SET_REQUIRED (fn);
 592                 }
 593               if (need_flsbuf)
 594                 {
 595                   strcpy (new_list + old_len, "_flsbuf");
 596                   old_len += 8;
 597                   SET_REQUIRED (flsbuf_fn);
 598                 }
 599               new_list[old_len] = '\0';
 600               required_functions_list = (namelist)new_list;
 601               required_unseen_count += need_filbuf + need_flsbuf;
 602             }
 603         }
 604     }
 605
 606   if (required_unseen_count + partial_count + missing_errno
 607 #if ADD_MISSING_EXTERN_C
 608       + missing_extern_C_count
 609 #endif
 610       == 0)
 611     {
 612       if (verbose)
 613         fprintf (stderr, "%s: OK, nothing needs to be done.\n", inc_filename);
 614       exit (0);
 615     }
 616   if (!verbose)
 617     fprintf (stderr, "%s: fixing %s\n", progname, inc_filename);
 618   else
 619     {
 620       if (required_unseen_count)
 621         fprintf (stderr, "%s: %d missing function declarations.\n",
 622                  inc_filename, required_unseen_count);
 623       if (partial_count)
 624         fprintf (stderr, "%s: %d non-prototype function declarations.\n",
 625                  inc_filename, partial_count);
 626 #if ADD_MISSING_EXTERN_C
 627       if (missing_extern_C_count)
 628         fprintf (stderr,
 629                  "%s: %d declarations not protected by extern \"C\".\n",
 630                  inc_filename, missing_extern_C_count);
 631 #endif
 632     }
 633 }
 634
 635 void
 636 write_rbrac ()
 637 {
 638   struct fn_decl *fn;
 639   const char *cptr;
 640
 641   if (required_unseen_count)
 642     {
 643       fprintf (outf,
 644         "#if defined(__cplusplus) || defined(__USE_FIXED_PROTOTYPES__)\n");
 645 #ifdef NO_IMPLICIT_EXTERN_C
 646       fprintf (outf, "#ifdef __cplusplus\nextern \"C\" {\n#endif\n");
 647 #endif
 648     }
 649
 650   /* Now we print out prototypes for those functions that we haven't seen. */
 651   for (cptr = required_functions_list; *cptr!= '\0'; )
 652     {
 653       int macro_protect = 0;
 654       int name_len = strlen (cptr);
 655
 656       fn = lookup_std_proto (cptr, name_len);
 657       cptr+= name_len + 1;
 658       if (fn == NULL || !REQUIRED (fn))
 659         continue;
 660
 661       /* In the case of memmove, protect in case the application
 662          defines it as a macro before including the header.  */
 663       if (!strcmp (fn->fname, "memmove")
 664           || !strcmp (fn->fname, "vprintf")
 665           || !strcmp (fn->fname, "vfprintf")
 666           || !strcmp (fn->fname, "vsprintf")
 667           || !strcmp (fn->fname, "rewinddir"))
 668         macro_protect = 1;
 669
 670       if (macro_protect)
 671         fprintf (outf, "#ifndef %s\n", fn->fname);
 672       fprintf (outf, "extern %s %s (%s);\n",
 673                fn->rtype, fn->fname, fn->params);
 674       if (macro_protect)
 675         fprintf (outf, "#endif\n");
 676     }
 677   if (required_unseen_count)
 678     {
 679 #ifdef NO_IMPLICIT_EXTERN_C
 680       fprintf (outf, "#ifdef __cplusplus\n}\n#endif\n");
 681 #endif
 682       fprintf (outf,
 683         "#endif /* defined(__cplusplus) || defined(__USE_FIXED_PROTOTYPES__*/\n");
 684     }
 685
 686   switch (special_file_handling)
 687     {
 688     case errno_h:
 689       if (missing_errno)
 690         fprintf (outf, "extern int errno;\n");
 691       break;
 692     case sys_stat_h:
 693       if (!seen_S_ISBLK && seen_S_IFBLK)
 694         fprintf (outf,
 695                  "#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)\n");
 696       if (!seen_S_ISCHR && seen_S_IFCHR)
 697         fprintf (outf,
 698                  "#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)\n");
 699       if (!seen_S_ISDIR && seen_S_IFDIR)
 700         fprintf (outf,
 701                  "#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)\n");
 702       if (!seen_S_ISFIFO && seen_S_IFIFO)
 703         fprintf (outf,
 704                  "#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)\n");
 705       if (!seen_S_ISLNK && seen_S_IFLNK)
 706         fprintf (outf,
 707                  "#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)\n");
 708       if (!seen_S_ISREG && seen_S_IFREG)
 709         fprintf (outf,
 710                  "#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)\n");
 711       break;
 712     }
 713
 714
 715 #if ADD_MISSING_EXTERN_C
 716   if (missing_extern_C_count + required_unseen_count > 0)
 717     fprintf (outf, "#ifdef __cplusplus\n}\n#endif\n");
 718 #endif
 719 }
 720
 721 char *
 722 xstrdup (str)
 723      char *str;
 724 {
 725   char *copy = (char *) xmalloc (strlen (str) + 1);
 726   strcpy (copy, str);
 727   return copy;
 728 }
 729
 730 /* Returns 1 iff the file is properly protected from multiple inclusion:
 731    #ifndef PROTECT_NAME
 732    #define PROTECT_NAME
 733    #endif
 734
 735  */
 736
 737 #define INF_GET() (inf_ptr < inf_limit ? *(unsigned char*)inf_ptr++ : EOF)
 738 #define INF_UNGET(c) ((c)!=EOF && inf_ptr--)
 739
 740 int
 741 inf_skip_spaces (c)
 742      int c;
 743 {
 744   for (;;)
 745     {
 746       if (c == ' ' || c == '\t')
 747         c = INF_GET ();
 748       else if (c == '/')
 749         {
 750           c = INF_GET ();
 751           if (c != '*')
 752             {
 753               INF_UNGET (c);
 754               return '/';
 755             }
 756           c = INF_GET ();
 757           for (;;)
 758             {
 759               if (c == EOF)
 760                 return EOF;
 761               else if (c != '*')
 762                 {
 763                   if (c == '\n')
 764                     source_lineno++, lineno++;
 765                   c = INF_GET ();
 766                 }
 767               else if ((c = INF_GET ()) == '/')
 768                 return INF_GET ();
 769             }
 770         }
 771       else
 772         break;
 773     }
 774   return c;
 775 }
 776
 777 /* Read into STR from inf_buffer upto DELIM. */
 778
 779 int
 780 inf_read_upto (str, delim)
 781      sstring *str;
 782      int delim;
 783 {
 784   int ch;
 785   for (;;)
 786     {
 787       ch = INF_GET ();
 788       if (ch == EOF || ch == delim)
 789         break;
 790       SSTRING_PUT (str, ch);
 791     }
 792   MAKE_SSTRING_SPACE (str, 1);
 793   *str->ptr = 0;
 794   return ch;
 795 }
 796
 797 int
 798 inf_scan_ident (s, c)
 799      register sstring *s;
 800      int c;
 801 {
 802   s->ptr = s->base;
 803   if (isalpha (c) || c == '_')
 804     {
 805       for (;;)
 806         {
 807           SSTRING_PUT (s, c);
 808           c = INF_GET ();
 809           if (c == EOF || !(isalnum (c) || c == '_'))
 810             break;
 811         }
 812     }
 813   MAKE_SSTRING_SPACE (s, 1);
 814   *s->ptr = 0;
 815   return c;
 816 }
 817
 818 /* Returns 1 if the file is correctly protected against multiple
 819    inclusion, setting *ifndef_line to the line number of the initial #ifndef
 820    and setting *endif_line to the final #endif.
 821    Otherwise return 0. */
 822
 823 int
 824 check_protection (ifndef_line, endif_line)
 825      int *ifndef_line, *endif_line;
 826 {
 827   int c;
 828   int if_nesting = 1; /* Level of nesting of #if's */
 829   char *protect_name = NULL; /* Identifier following initial #ifndef */
 830   int define_seen = 0;
 831
 832   /* Skip initial white space (including comments). */
 833   for (;; lineno++)
 834     {
 835       c = inf_skip_spaces (' ');
 836       if (c == EOF)
 837         return 0;
 838       if (c != '\n')
 839         break;
 840     }
 841   if (c != '#')
 842     return 0;
 843   c = inf_scan_ident (&buf, inf_skip_spaces (' '));
 844   if (SSTRING_LENGTH (&buf) == 0 || strcmp (buf.base, "ifndef") != 0)
 845     return 0;
 846
 847   /* So far so good: We've seen an initial #ifndef. */
 848   *ifndef_line = lineno;
 849   c = inf_scan_ident (&buf, inf_skip_spaces (c));
 850   if (SSTRING_LENGTH (&buf) == 0 || c == EOF)
 851     return 0;
 852   protect_name = xstrdup (buf.base);
 853
 854   INF_UNGET (c);
 855   c = inf_read_upto (&buf, '\n');
 856   if (c == EOF)
 857     return 0;
 858   lineno++;
 859
 860   for (;;)
 861     {
 862       c = inf_skip_spaces (' ');
 863       if (c == EOF)
 864         return 0;
 865       if (c == '\n')
 866         {
 867           lineno++;
 868           continue;
 869         }
 870       if (c != '#')
 871         goto skip_to_eol;
 872       c = inf_scan_ident (&buf, inf_skip_spaces (' '));
 873       if (SSTRING_LENGTH (&buf) == 0)
 874         ;
 875       else if (!strcmp (buf.base, "ifndef")
 876           || !strcmp (buf.base, "ifdef") || !strcmp (buf.base, "if"))
 877         {
 878           if_nesting++;
 879         }
 880       else if (!strcmp (buf.base, "endif"))
 881         {
 882           if_nesting--;
 883           if (if_nesting == 0)
 884             break;
 885         }
 886       else if (!strcmp (buf.base, "else"))
 887         {
 888           if (if_nesting == 1)
 889             return 0;
 890         }
 891       else if (!strcmp (buf.base, "define"))
 892         {
 893           if (if_nesting != 1)
 894             goto skip_to_eol;
 895           c = inf_skip_spaces (c);
 896           c = inf_scan_ident (&buf, c);
 897           if (buf.base[0] > 0 && strcmp (buf.base, protect_name) == 0)
 898             define_seen = 1;
 899         }
 900     skip_to_eol:
 901       for (;;)
 902         {
 903           if (c == '\n' || c == EOF)
 904             break;
 905           c = INF_GET ();
 906         }
 907       if (c == EOF)
 908         return 0;
 909       lineno++;
 910     }
 911
 912   if (!define_seen)
 913      return 0;
 914   *endif_line = lineno;
 915   /* Skip final white space (including comments). */
 916   for (;;)
 917     {
 918       c = inf_skip_spaces (' ');
 919       if (c == EOF)
 920         break;
 921       if (c != '\n')
 922         return 0;
 923     }
 924
 925   return 1;
 926 }
 927
 928 int
 929 main (argc, argv)
 930      int argc;
 931      char **argv;
 932 {
 933   int inf_fd;
 934   struct stat sbuf;
 935   int c;
 936   int i, done;
 937   const char *cptr, **pptr;
 938   int ifndef_line;
 939   int endif_line;
 940   long to_read;
 941   long int inf_size;
 942
 943   if (argv[0] && argv[0][0])
 944     {
 945       register char *p;
 946
 947       progname = 0;
 948       for (p = argv[0]; *p; p++)
 949         if (*p == '/')
 950           progname = p;
 951       progname = progname ? progname+1 : argv[0];
 952     }
 953
 954   if (argc < 4)
 955     {
 956       fprintf (stderr, "%s: Usage: foo.h infile.h outfile.h options\n",
 957                progname);
 958       exit (-1);
 959     }
 960
 961   inc_filename = argv[1];
 962   inc_filename_length = strlen (inc_filename);
 963
 964 #ifdef FIXPROTO_IGNORE_LIST
 965   for (i = 0; files_to_ignore[i] != NULL; i++)
 966     {
 967       char *ignore_name = files_to_ignore[i];
 968       int ignore_len = strlen (ignore_name);
 969       if (strncmp (inc_filename, ignore_name, ignore_len) == 0)
 970         {
 971           if (ignore_name[ignore_len-1] == '/'
 972               || inc_filename[ignore_len] == '\0')
 973             {
 974               if (verbose)
 975                 fprintf (stderr, "%s: ignoring %s\n", progname, inc_filename);
 976               exit (0);
 977             }
 978         }
 979
 980     }
 981 #endif
 982
 983   if (strcmp (inc_filename, "sys/stat.h") == 0)
 984     special_file_handling = sys_stat_h;
 985   else if (strcmp (inc_filename, "errno.h") == 0)
 986     special_file_handling = errno_h, missing_errno = 1;
 987   else if (strcmp (inc_filename, "stdio.h") == 0)
 988     special_file_handling = stdio_h;
 989   include_entry = std_include_table;
 990   while (include_entry->name != NULL
 991          && strcmp (inc_filename, include_entry->name) != 0)
 992     include_entry++;
 993
 994   required_functions_list = include_entry->required;
 995
 996   /* Count and mark the prototypes required for this include file. */
 997   for (cptr = required_functions_list; *cptr!= '\0'; )
 998     {
 999       int name_len = strlen (cptr);
1000       struct fn_decl *fn = lookup_std_proto (cptr, name_len);
1001       required_unseen_count++;
1002       if (fn == NULL)
1003         fprintf (stderr, "Internal error:  No prototype for %s\n", cptr);
1004       else
1005         SET_REQUIRED (fn);
1006       cptr += name_len + 1;
1007     }
1008
1009   read_scan_file (argv[2], argc - 4, argv + 4);
1010
1011   inf_fd = open (argv[2], O_RDONLY, 0666);
1012   if (inf_fd < 0)
1013     {
1014       fprintf (stderr, "%s: Cannot open '%s' for reading -",
1015                progname, argv[2]);
1016       perror (NULL);
1017       exit (-1);
1018     }
1019   if (fstat (inf_fd, &sbuf) < 0)
1020     {
1021       fprintf (stderr, "%s: Cannot get size of '%s' -", progname, argv[2]);
1022       perror (NULL);
1023       exit (-1);
1024     }
1025   inf_size = sbuf.st_size;
1026   inf_buffer = (char*) xmalloc (inf_size + 2);
1027   inf_buffer[inf_size] = '\n';
1028   inf_buffer[inf_size + 1] = '\0';
1029   inf_limit = inf_buffer + inf_size;
1030   inf_ptr = inf_buffer;
1031
1032   to_read = inf_size;
1033   while (to_read > 0)
1034     {
1035       long i = read (inf_fd, inf_buffer + inf_size - to_read, to_read);
1036       if (i < 0)
1037         {
1038           fprintf (stderr, "%s: Failed to read '%s' -", progname, argv[2]);
1039           perror (NULL);
1040           exit (-1);
1041         }
1042       if (i == 0)
1043         {
1044           inf_size -= to_read;
1045           break;
1046         }
1047       to_read -= i;
1048     }
1049
1050   close (inf_fd);
1051
1052   /* If file doesn't end with '\n', add one. */
1053   if (inf_limit > inf_buffer && inf_limit[-1] != '\n')
1054     inf_limit++;
1055
1056   unlink (argv[3]);
1057   outf = fopen (argv[3], "w");
1058   if (outf == NULL)
1059     {
1060       fprintf (stderr, "%s: Cannot open '%s' for writing -",
1061                progname, argv[3]);
1062       perror (NULL);
1063       exit (-1);
1064     }
1065
1066   lineno = 1;
1067
1068   if (check_protection (&ifndef_line, &endif_line))
1069     {
1070       lbrac_line = ifndef_line+1;
1071       rbrac_line = endif_line;
1072     }
1073   else
1074     {
1075       lbrac_line = 1;
1076       rbrac_line = -1;
1077     }
1078
1079   /* Reset input file. */
1080   inf_ptr = inf_buffer;
1081   lineno = 1;
1082
1083   for (;;)
1084     {
1085       if (lineno == lbrac_line)
1086         write_lbrac ();
1087       if (lineno == rbrac_line)
1088         write_rbrac ();
1089       for (;;)
1090         {
1091           struct fn_decl *fn;
1092           c = INF_GET ();
1093           if (c == EOF)
1094             break;
1095           if (isalpha (c) || c == '_')
1096             {
1097               c = inf_scan_ident (&buf, c);
1098               INF_UNGET (c);
1099               fputs (buf.base, outf);
1100               fn = lookup_std_proto (buf.base, strlen (buf.base));
1101               /* We only want to edit the declaration matching the one
1102                  seen by scan-decls, as there can be multiple
1103                  declarations, selected by #ifdef __STDC__ or whatever. */
1104               if (fn && fn->partial && fn->partial->line_seen == lineno)
1105                 {
1106                   c = inf_skip_spaces (' ');
1107                   if (c == EOF)
1108                     break;
1109                   if (c == '(')
1110                     {
1111                       c = inf_skip_spaces (' ');
1112                       if (c == ')')
1113                         {
1114                           fprintf (outf, " _PARAMS((%s))", fn->params);
1115                         }
1116                       else
1117                         {
1118                           putc ('(', outf);
1119                           INF_UNGET (c);
1120                         }
1121                     }
1122                   else
1123                     fprintf (outf, " %c", c);
1124                 }
1125             }
1126           else
1127             {
1128               putc (c, outf);
1129               if (c == '\n')
1130                 break;
1131             }
1132         }
1133       if (c == EOF)
1134         break;
1135       lineno++;
1136     }
1137   if (rbrac_line < 0)
1138     write_rbrac ();
1139
1140   fclose (outf);
1141
1142   return 0;
1143 }
1144 \f
1145 /* Stub error functions.  These replace cpperror.c,
1146    because we want to suppress error messages. */
1147
1148 void
1149 cpp_file_line_for_message (pfile, filename, line, column)
1150      cpp_reader *pfile;
1151      char *filename;
1152      int line, column;
1153 {
1154   if (!verbose)
1155     return;
1156   if (column > 0)
1157     fprintf (stderr, "%s:%d:%d: ", filename, line, column);
1158   else
1159     fprintf (stderr, "%s:%d: ", filename, line);
1160 }
1161
1162 void
1163 cpp_print_containing_files (pfile)
1164      cpp_reader *pfile;
1165 {
1166 }
1167
1168 /* IS_ERROR is 1 for error, 0 for warning */
1169 void cpp_message (pfile, is_error, msg, arg1, arg2, arg3)
1170      int is_error;
1171      cpp_reader *pfile;
1172      char *msg;
1173      char *arg1, *arg2, *arg3;
1174 {
1175   if (is_error)
1176     pfile->errors++;
1177   if (!verbose)
1178     return;
1179   if (!is_error)
1180     fprintf (stderr, "warning: ");
1181   fprintf (stderr, msg, arg1, arg2, arg3);
1182   fprintf (stderr, "\n");
1183 }
1184
1185 void
1186 fatal (str, arg)
1187      char *str, *arg;
1188 {
1189   fprintf (stderr, "%s: %s: ", progname, inc_filename);
1190   fprintf (stderr, str, arg);
1191   fprintf (stderr, "\n");
1192   exit (FATAL_EXIT_CODE);
1193 }
1194
1195 void
1196 cpp_pfatal_with_name (pfile, name)
1197      cpp_reader *pfile;
1198      char *name;
1199 {
1200   cpp_perror_with_name (pfile, name);
1201   exit (FATAL_EXIT_CODE);
1202 }