gcc/cppmain.c

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