kc3-lang/gnulib/lib/regex-quote.c

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• Hash : d60f3b0c
  Author :
  Date : 2011-01-01T20:17:23
  

  maint: update almost all copyright ranges to include 2011
  
  Run the new "make update-copyright" rule.
  

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• lib/regex-quote.c

• /* Construct a regular expression from a literal string.
     Copyright (C) 1995, 2010-2011 Free Software Foundation, Inc.
     Written by Bruno Haible <haible@clisp.cons.org>, 2010.
  
     This program 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 of the License, or
     (at your option) any later version.
  
     This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "regex-quote.h"
  
  #include <string.h>
  
  #include "mbuiter.h"
  #include "xalloc.h"
  
  /* Characters that are special in a BRE.  */
  static const char bre_special[] = "$^.*[]\\";
  
  /* Characters that are special in an ERE.  */
  static const char ere_special[] = "$^.*[]\\+?()";
  
  size_t
  regex_quote_length (const char *string, int cflags)
  {
    const char *special = (cflags != 0 ? ere_special : bre_special);
    size_t length;
    mbui_iterator_t iter;
  
    length = 0;
    for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter))
      {
        /* We know that special contains only ASCII characters.  */
        if (mb_len (mbui_cur (iter)) == 1
            && strchr (special, * mbui_cur_ptr (iter)))
          length += 1;
        length += mb_len (mbui_cur (iter));
      }
    return length;
  }
  
  /* Copies the quoted string to p and returns the incremented p.
     There must be room for regex_quote_length (string, cflags) + 1 bytes at p.
   */
  char *
  regex_quote_copy (char *p, const char *string, int cflags)
  {
    const char *special = (cflags != 0 ? ere_special : bre_special);
    mbui_iterator_t iter;
  
    for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter))
      {
        /* We know that special contains only ASCII characters.  */
        if (mb_len (mbui_cur (iter)) == 1
            && strchr (special, * mbui_cur_ptr (iter)))
          *p++ = '\\';
        memcpy (p, mbui_cur_ptr (iter), mb_len (mbui_cur (iter)));
        p += mb_len (mbui_cur (iter));
      }
    return p;
  }
  
  /* Returns the freshly allocated quoted string.  */
  char *
  regex_quote (const char *string, int cflags)
  {
    size_t length = regex_quote_length (string, cflags);
    char *result = XNMALLOC (length + 1, char);
    char *p;
  
    p = result;
    p = regex_quote_copy (p, string, cflags);
    *p = '\0';
    return result;
  }
  

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