gcc/cppmain.c

   1 /* CPP main program, using CPP Library.
   2    Copyright (C) 1995, 1997-1999, 2000 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 "config.h"
  24 #include "system.h"
  25 #include "cpplib.h"
  26 #include "intl.h"
  27
  28 const char *progname;
  29
  30 cpp_reader parse_in;
  31 cpp_options options;
  32
  33 \f
  34 extern int main                         PARAMS ((int, char **));
  35 int
  36 main (argc, argv)
  37      int argc;
  38      char **argv;
  39 {
  40   char *p;
  41   int argi = 1;  /* Next argument to handle.  */
  42   struct cpp_options *opts = &options;
  43   enum cpp_token kind;
  44
  45   p = argv[0] + strlen (argv[0]);
  46   while (p != argv[0] && p[-1] != '/') --p;
  47   progname = p;
  48
  49 #ifdef HAVE_LC_MESSAGES
  50   setlocale (LC_MESSAGES, "");
  51 #endif
  52   (void) bindtextdomain (PACKAGE, localedir);
  53   (void) textdomain (PACKAGE);
  54
  55   cpp_reader_init (&parse_in);
  56   parse_in.opts = opts;
  57
  58   cpp_options_init (opts);
  59
  60   argi += cpp_handle_options (&parse_in, argc - argi , argv + argi);
  61   if (argi < argc && ! CPP_FATAL_ERRORS (&parse_in))
  62     cpp_fatal (&parse_in, "Invalid option `%s'", argv[argi]);
  63   if (CPP_FATAL_ERRORS (&parse_in))
  64     return (FATAL_EXIT_CODE);
  65
  66   parse_in.show_column = 1;
  67
  68   if (! cpp_start_read (&parse_in, opts->in_fname))
  69     return (FATAL_EXIT_CODE);
  70
  71   /* Now that we know the input file is valid, open the output.  */
  72
  73   if (!opts->out_fname || !strcmp (opts->out_fname, ""))
  74     opts->out_fname = "stdout";
  75   else if (! freopen (opts->out_fname, "w", stdout))
  76     {
  77       cpp_notice_from_errno (&parse_in, opts->out_fname);
  78       return (FATAL_EXIT_CODE);
  79     }
  80
  81   if (! opts->no_output)
  82     {
  83       do
  84         {
  85           kind = cpp_get_token (&parse_in);
  86           if (CPP_WRITTEN (&parse_in) >= BUFSIZ || kind == CPP_EOF)
  87             {
  88               size_t rem, count = CPP_WRITTEN (&parse_in);
  89
  90               rem = fwrite (parse_in.token_buffer, 1, count, stdout);
  91               if (rem < count)
  92                 /* Write error. */
  93                 cpp_notice_from_errno (&parse_in, opts->out_fname);
  94
  95               CPP_SET_WRITTEN (&parse_in, 0);
  96             }
  97         }
  98       while (kind != CPP_EOF);
  99     }
 100   else
 101     {
 102       do
 103         {
 104           cpp_scan_buffer (&parse_in);
 105           kind = cpp_get_token (&parse_in);
 106         }
 107       while (kind != CPP_EOF);
 108       CPP_SET_WRITTEN (&parse_in, 0);
 109     }
 110
 111   cpp_finish (&parse_in);
 112   if (fwrite (parse_in.token_buffer, 1, CPP_WRITTEN (&parse_in), stdout)
 113       < CPP_WRITTEN (&parse_in))
 114     cpp_notice_from_errno (&parse_in, opts->out_fname);
 115
 116   cpp_cleanup (&parse_in);
 117
 118   if (parse_in.errors)
 119     return (FATAL_EXIT_CODE);
 120   return (SUCCESS_EXIT_CODE);
 121 }