gcc/cppmain.c

   1 /* CPP main program, using CPP Library.
   2    Copyright (C) 1995, 1997, 1998, 1999 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 #else
  27 #include <stdio.h>
  28
  29 extern char *getenv ();
  30 #endif /* not EMACS */
  31
  32 #include "cpplib.h"
  33 #include "intl.h"
  34
  35 const char *progname;
  36
  37 cpp_reader parse_in;
  38 cpp_options options;
  39
  40 \f
  41 extern int main                         PARAMS ((int, char **));
  42 int
  43 main (argc, argv)
  44      int argc;
  45      char **argv;
  46 {
  47   char *p;
  48   int argi = 1;  /* Next argument to handle.  */
  49   struct cpp_options *opts = &options;
  50   enum cpp_token kind;
  51
  52   p = argv[0] + strlen (argv[0]);
  53   while (p != argv[0] && p[-1] != '/') --p;
  54   progname = p;
  55
  56 #ifdef HAVE_LC_MESSAGES
  57   setlocale (LC_MESSAGES, "");
  58 #endif
  59   (void) bindtextdomain (PACKAGE, localedir);
  60   (void) textdomain (PACKAGE);
  61
  62   cpp_reader_init (&parse_in);
  63   parse_in.opts = opts;
  64
  65   cpp_options_init (opts);
  66
  67   argi += cpp_handle_options (&parse_in, argc - argi , argv + argi);
  68   if (argi < argc && ! CPP_FATAL_ERRORS (&parse_in))
  69     cpp_fatal (&parse_in, "Invalid option `%s'", argv[argi]);
  70   if (CPP_FATAL_ERRORS (&parse_in))
  71     return (FATAL_EXIT_CODE);
  72
  73   parse_in.show_column = 1;
  74
  75   if (! cpp_start_read (&parse_in, opts->in_fname))
  76     return (FATAL_EXIT_CODE);
  77
  78   /* Now that we know the input file is valid, open the output.  */
  79
  80   if (!opts->out_fname || !strcmp (opts->out_fname, ""))
  81     opts->out_fname = "stdout";
  82   else if (! freopen (opts->out_fname, "w", stdout))
  83     cpp_pfatal_with_name (&parse_in, opts->out_fname);
  84
  85   if (! opts->no_output)
  86     {
  87       do
  88         {
  89           kind = cpp_get_token (&parse_in);
  90           if (CPP_WRITTEN (&parse_in) >= BUFSIZ || kind == CPP_EOF)
  91             {
  92               size_t rem, count = CPP_WRITTEN (&parse_in);
  93
  94               rem = fwrite (parse_in.token_buffer, 1, count, stdout);
  95               if (rem < count)
  96                 /* Write error. */
  97                 cpp_pfatal_with_name (&parse_in, opts->out_fname);
  98
  99               CPP_SET_WRITTEN (&parse_in, 0);
 100             }
 101         }
 102       while (kind != CPP_EOF);
 103     }
 104   else
 105     {
 106       do
 107         {
 108           cpp_scan_buffer (&parse_in);
 109           kind = cpp_get_token (&parse_in);
 110         }
 111       while (kind != CPP_EOF);
 112       CPP_SET_WRITTEN (&parse_in, 0);
 113     }
 114
 115   cpp_finish (&parse_in);
 116   if (fwrite (parse_in.token_buffer, 1, CPP_WRITTEN (&parse_in), stdout)
 117       < CPP_WRITTEN (&parse_in))
 118     cpp_pfatal_with_name (&parse_in, opts->out_fname);
 119
 120   if (parse_in.errors)
 121     return (FATAL_EXIT_CODE);
 122   return (SUCCESS_EXIT_CODE);
 123 }