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/* Specific flags and argument handling of the C preprocessor.

   Copyright (C) 1999, 2007 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "gcc.h"

/* The `cpp' executable installed in $(bindir) and $(cpp_install_dir)

   is a customized version of the gcc driver.  It forces -E; -S and -c

   are errors.  It defaults to -x c for files with unrecognized

   extensions, unless -x options appear in argv, in which case we

   assume the user knows what they're doing.  If no explicit input is

   mentioned, it will read stdin.  */

#ifndef SWITCH_TAKES_ARG

#define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)

#endif

#ifndef WORD_SWITCH_TAKES_ARG

#define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)

#endif

/* Suffixes for known sorts of input files.  Note that we do not list

   files which are normally considered to have been preprocessed already,

   since the user's expectation is that `cpp' always preprocesses.  */

static const char *const known_suffixes[] =

{

  ".c",  ".C",   ".S",   ".m",

  ".cc", ".cxx", ".cpp", ".cp",  ".c++",

  ".sx",

  NULL

};

/* Filter argc and argv before processing by the gcc driver proper.  */

void

lang_specific_driver (int *in_argc, const char *const **in_argv,

                      int *in_added_libraries ATTRIBUTE_UNUSED)

{

  int argc = *in_argc;

  const char *const *argv = *in_argv;

  /* Do we need to read stdin? */

  int read_stdin = 1;

  /* Do we need to insert -E? */

  int need_E = 1;

  /* Have we seen an input file? */

  int seen_input = 0;

  /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary.

  int lang_c_here = 0;

  int lang_S_here = 0;

  int o_here = 0;

  /* Do we need to fix up an input file with an unrecognized suffix? */

  int need_fixups = 1;

  int i, j, quote = 0;

  const char **new_argv;

  int new_argc;

  extern int is_cpp_driver;

  is_cpp_driver = 1;

  /* First pass.  If we see an -S or -c, barf.  If we see an input file,

     turn off read_stdin.  If we see a second input file, it is actually

     the output file.  If we see a third input file, barf.  */

  for (i = 1; i < argc; i++)

    {

      if (quote == 1)

        {

          quote = 0;

          continue;

        }

      if (argv[i][0] == '-')

        {

          if (argv[i][1] == '\0')

            read_stdin = 0;

          else if (argv[i][2] == '\0')

            {

              if (argv[i][1] == 'E')

                need_E = 0;

              else if (argv[i][1] == 'S' || argv[i][1] == 'c')

                {

                  fatal ("\"%s\" is not a valid option to the preprocessor",

                         argv[i]);

                  return;

                }

              else if (argv[i][1] == 'x')

                {

                  need_fixups = 0;

                  quote = 1;

                }

              else if (SWITCH_TAKES_ARG (argv[i][1]))

                quote = 1;

            }

          else if (argv[i][1] == 'x')

            need_fixups = 0;

          else if (WORD_SWITCH_TAKES_ARG (&argv[i][1]))

            quote = 1;

        }

      else /* not an option */

        {

          seen_input++;

          if (seen_input == 3)

            {

              fatal ("too many input files");

              return;

            }

          else if (seen_input == 2)

            {

              o_here = i;

            }

          else

            {

              read_stdin = 0;

              if (need_fixups)

                {

                  int l = strlen (argv[i]);

                  int known = 0;

                  const char *const *suff;

                  for (suff = known_suffixes; *suff; suff++)

                    if (!strcmp (*suff, &argv[i][l - strlen(*suff)]))

                      {

                        known = 1;

                        break;

                      }

                  if (! known)

                    {

                      /* .s files are a special case; we have to treat

                         them like .S files so -D__ASSEMBLER__ will be

                         in effect.  */

                      if (!strcmp (".s", &argv[i][l - 2]))

                        lang_S_here = i;

                      else

                        lang_c_here = i;

                    }

                }

            }

        }

    }

  /* If we don't need to edit the command line, we can bail early.  */

  new_argc = argc + need_E + read_stdin

    + !!o_here + !!lang_c_here + !!lang_S_here;

  if (new_argc == argc)

    return;

  /* One more slot for a terminating null.  */

  new_argv = XNEWVEC (const char *, new_argc + 1);

  new_argv[0] = argv[0];

  j = 1;

  if (need_E)

    new_argv[j++] = "-E";

  for (i = 1; i < argc; i++, j++)

    {

      if (i == lang_c_here)

        new_argv[j++] = "-xc";

      else if (i == lang_S_here)

        new_argv[j++] = "-xassembler-with-cpp";

      else if (i == o_here)

        new_argv[j++] = "-o";

      new_argv[j] = argv[i];

    }

  if (read_stdin)

    new_argv[j++] = "-";

  new_argv[j] = NULL;

  *in_argc = new_argc;

  *in_argv = new_argv;

}

/* Called before linking.  Returns 0 on success and -1 on failure.  */

int lang_specific_pre_link (void)

{

  return 0;  /* Not used for cpp.  */

}

/* Number of extra output files that lang_specific_pre_link may generate.  */

int lang_specific_extra_outfiles = 0;  /* Not used for cpp.  */