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/* Install modified versions of certain ANSI-incompatible system header

   files which are fixed to work correctly with ANSI C and placed in a

   directory that GCC will search.

   Copyright (C) 1999, 2000, 2001, 2004, 2009 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 "fixlib.h"

/* * * * * * * * * * * * *

   load_file_data loads all the contents of a file into malloc-ed memory.

   Its argument is the file pointer of the file to read in; the returned

   result is the NUL terminated contents of the file.  The file

   is presumed to be an ASCII text file containing no NULs.  */

char *

load_file_data (FILE* fp)

{

  char *pz_data = (char*)NULL;

  int    space_left = -1;  /* allow for terminating NUL */

  size_t space_used = 0;

  if (fp == (FILE*)NULL)

    return pz_data;

  do

    {

      size_t  size_read;

      if (space_left < 1024)

        {

          space_left += 4096;

          pz_data = XRESIZEVEC (char, pz_data, space_left + space_used + 1 );

        }

      size_read = fread (pz_data + space_used, 1, space_left, fp);

      if (size_read == 0)

        {

          if (feof (fp))

            break;

          if (ferror (fp))

            {

              int err = errno;

              if (err != EISDIR)

                fprintf (stderr, "error %d (%s) reading input\n", err,

                         xstrerror (err));

              free ((void *) pz_data);

              return (char *) NULL;

            }

        }

      space_left -= size_read;

      space_used += size_read;

    } while (! feof (fp));

  pz_data = XRESIZEVEC (char, pz_data, space_used+1 );

  pz_data[ space_used ] = NUL;

  return pz_data;

}

#ifdef IS_CXX_HEADER_NEEDED

t_bool

is_cxx_header (tCC* fname, tCC* text)

{

  /*  First, check to see if the file is in a C++ directory */

  for (;;)

    {

      switch (*(fname++))

        {

        case 'C': /* check for "CC/" */

          if ((fname[0] == 'C') && (fname[1] == '/'))

            return BOOL_TRUE;

          break;

        case 'x': /* check for "xx/" */

          if ((fname[0] == 'x') && (fname[1] == '/'))

            return BOOL_TRUE;

          break;

        case '+': /* check for "++" */

          if (fname[0] == '+')

            return BOOL_TRUE;

          break;

        case NUL:

          goto not_cxx_name;

        }

    } not_cxx_name:;

  /* Or it might contain one of several phrases which indicate C++ code.

     Currently recognized are:

     extern "C++"

     -*- (Mode: )? C++ -*-   (emacs mode marker)

     template <

   */

    {

      tSCC cxxpat[] = "\

extern[ \t]*\"C\\+\\+\"|\

-\\*-[ \t]*([mM]ode:[ \t]*)?[cC]\\+\\+[; \t]*-\\*-|\

template[ \t]*<|\

^[ \t]*class[ \t]|\

(public|private|protected):|\

^[ \t]*#[ \t]*pragma[ \t]+(interface|implementation)\

";

      static regex_t cxxre;

      static int compiled;

      if (!compiled)

        compile_re (cxxpat, &cxxre, 0, "contents check", "is_cxx_header");

      if (xregexec (&cxxre, text, 0, 0, 0) == 0)

        return BOOL_TRUE;

    }

  return BOOL_FALSE;

}

#endif /* CXX_TYPE_NEEDED */

#ifdef SKIP_QUOTE_NEEDED

/*

 *  Skip over a quoted string.  Single quote strings may

 *  contain multiple characters if the first character is

 *  a backslash.  Especially a backslash followed by octal digits.

 *  We are not doing a correctness syntax check here.

 */

tCC*

skip_quote(char q, char* text )

{

  for (;;)

    {

      char ch = *(text++);

      switch (ch)

        {

        case '\\':

          text++; /* skip over whatever character follows */

          break;

        case '"':

        case '\'':

          if (ch != q)

            break;

          /*FALLTHROUGH*/

        case '\n':

        case NUL:

          goto skip_done;

        }

    } skip_done:;

  return text;

}

#endif /* SKIP_QUOTE_NEEDED */

/* * * * * * * * * * * * *

   Compile one regular expression pattern for later use.  PAT contains

   the pattern, RE points to a regex_t structure (which should have

   been bzeroed).  MATCH is 1 if we need to know where the regex

   matched, 0 if not. If xregcomp fails, prints an error message and

   aborts; E1 and E2 are strings to shove into the error message.

   The patterns we search for are all egrep patterns.

   REG_EXTENDED|REG_NEWLINE produces identical regex syntax/semantics

   to egrep (verified from 4.4BSD Programmer's Reference Manual).  */

void

compile_re( tCC* pat, regex_t* re, int match, tCC* e1, tCC* e2 )

{

  tSCC z_bad_comp[] = "fixincl ERROR:  cannot compile %s regex for %s\n\

\texpr = `%s'\n\terror %s\n";

  int flags, err;

  flags = (match ? REG_EXTENDED|REG_NEWLINE

           : REG_EXTENDED|REG_NEWLINE|REG_NOSUB);

  err = xregcomp (re, pat, flags);

  if (err)

    {

      char rerrbuf[1024];

      regerror (err, re, rerrbuf, 1024);

      fprintf (stderr, z_bad_comp, e1, e2, pat, rerrbuf);

      exit (EXIT_FAILURE);

    }

}

/* * * * * * * * * * * * *

   Helper routine and data for the machine_name test and fix.  */

tSCC mn_label_pat[] = "^[ \t]*#[ \t]*(if|ifdef|ifndef)[ \t]+";

static regex_t mn_label_re;

static regex_t mn_name_re;

static int mn_compiled = 0;

t_bool

mn_get_regexps(regex_t** label_re, regex_t** name_re, tCC* who )

{

  if (! pz_mn_name_pat)

    return BOOL_FALSE;

  if (! mn_compiled)

    {

      compile_re (mn_label_pat, &mn_label_re, 1, "label pattern", who);

      compile_re (pz_mn_name_pat, &mn_name_re, 1, "name pattern", who);

      mn_compiled++;

    }

  *label_re = &mn_label_re;

  *name_re = &mn_name_re;

  return BOOL_TRUE;

}

#ifdef SEPARATE_FIX_PROC

char*

make_raw_shell_str( char* pz_d, tCC* pz_s, size_t smax )

{

  tSCC zQ[] = "'\\''";

  size_t     dtaSize;

  char*      pz_d_start = pz_d;

  smax--; /* adjust for trailing NUL */

  dtaSize = strlen( pz_s ) + 3;

  {

    const char* pz = pz_s - 1;

    for (;;) {

      pz = strchr( pz+1, '\'' );

      if (pz == (char*)NULL)

        break;

      dtaSize += sizeof( zQ )-1;

    }

  }

  if (dtaSize > smax)

    return (char*)NULL;

  *(pz_d++) = '\'';

  for (;;) {

    if ((size_t) (pz_d - pz_d_start) >= smax)

      return (char*)NULL;

    switch (*(pz_d++) = *(pz_s++)) {

    case NUL:

      goto loopDone;

    case '\'':

      if ((size_t) (pz_d - pz_d_start) >= smax - sizeof( zQ )-1)

        return (char*)NULL;

      strcpy( pz_d-1, zQ );

      pz_d += sizeof( zQ )-2;

    }

  } loopDone:;

  pz_d[-1] = '\'';

  *pz_d    = NUL;

  return pz_d;

}

#endif