gcc/cppmain.c

   1 /* CPP main program, using CPP Library.
   2    Copyright (C) 1995, 1997 Free Software Foundation, Inc.
   3    Written by Per Bothner, 1994-95.
   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  In other words, you are welcome to use, share and improve this program.
  20  You are forbidden to forbid anyone else to use, share and improve
  21  what you give them.   Help stamp out software-hoarding!  */
  22
  23 #ifndef EMACS
  24 #include "config.h"
  25 #include "system.h"
  26 #include "gansidecl.h"
  27 #else
  28 #include <stdio.h>
  29
  30 extern char *getenv ();
  31 #endif /* not EMACS */
  32
  33 #include "cpplib.h"
  34
  35 char *progname;
  36
  37 cpp_reader parse_in;
  38 cpp_options options;
  39
  40 #ifdef abort
  41 /* More 'friendly' abort that prints the line and file.
  42    config.h can #define abort fancy_abort if you like that sort of thing.  */
  43 void
  44 fatal (s)
  45      char *s;
  46 {
  47   fputs (s, stderr);
  48   exit (FATAL_EXIT_CODE);
  49 }
  50
  51 void
  52 fancy_abort ()
  53 {
  54   fatal ("Internal gcc abort.");
  55 }
  56 #endif
  57
  58 \f
  59 int
  60 main (argc, argv)
  61      int argc;
  62      char **argv;
  63 {
  64   char *p;
  65   int argi = 1;  /* Next argument to handle.  */
  66   struct cpp_options *opts = &options;
  67
  68   p = argv[0] + strlen (argv[0]);
  69   while (p != argv[0] && p[-1] != '/') --p;
  70   progname = p;
  71
  72   cpp_reader_init (&parse_in);
  73   parse_in.data = opts;
  74
  75   cpp_options_init (opts);
  76
  77   argi += cpp_handle_options (&parse_in, argc - argi , argv + argi);
  78   if (argi < argc && ! CPP_FATAL_ERRORS (&parse_in))
  79     cpp_fatal (&parse_in, "Invalid option `%s'", argv[argi]);
  80   if (CPP_FATAL_ERRORS (&parse_in))
  81     exit (FATAL_EXIT_CODE);
  82
  83   parse_in.show_column = 1;
  84
  85   if (! cpp_start_read (&parse_in, opts->in_fname))
  86     exit (FATAL_EXIT_CODE);
  87
  88   /* Now that we know the input file is valid, open the output.  */
  89
  90   if (!opts->out_fname || !strcmp (opts->out_fname, ""))
  91     opts->out_fname = "stdout";
  92   else if (! freopen (opts->out_fname, "w", stdout))
  93     cpp_pfatal_with_name (&parse_in, opts->out_fname);
  94
  95   for (;;)
  96     {
  97       enum cpp_token kind;
  98       if (! opts->no_output)
  99         {
 100           fwrite (parse_in.token_buffer, 1, CPP_WRITTEN (&parse_in), stdout);
 101         }
 102       CPP_SET_WRITTEN (&parse_in, 0);
 103       kind = cpp_get_token (&parse_in);
 104       if (kind == CPP_EOF)
 105         break;
 106     }
 107
 108   cpp_finish (&parse_in);
 109
 110   if (parse_in.errors)
 111     exit (FATAL_EXIT_CODE);
 112   exit (SUCCESS_EXIT_CODE);
 113 }