kc3-lang/gnulib/lib/memcoll.c

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• Hash : 1c613429
  Author :
  Date : 2003-07-18T17:49:25
  

  (memcoll) [!HAVE_STRCOLL]: Clear errno.
  

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• lib/memcoll.c

• /* Locale-specific memory comparison.
     Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
  
     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 2, 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, write to the Free Software Foundation,
     Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  
  /* Contributed by Paul Eggert <eggert@twinsun.com>.  */
  
  #if HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  #include "memcoll.h"
  
  #include <errno.h>
  #ifndef errno
  extern int errno;
  #endif
  
  #if HAVE_STRING_H
  # include <string.h>
  #endif
  
  /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
     to the LC_COLLATE locale.  S1 and S2 do not overlap, and are not
     adjacent.  Perhaps temporarily modify the bytes after S1 and S2,
     but restore their original contents before returning.  Set errno to an
     error number if there is an error, and to zero otherwise.  */
  int
  memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
  {
    int diff;
  
  #if HAVE_STRCOLL
  
    char n1 = s1[s1len];
    char n2 = s2[s2len];
  
    s1[s1len++] = '\0';
    s2[s2len++] = '\0';
  
    while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))
      {
        /* strcoll found no difference, but perhaps it was fooled by NUL
  	 characters in the data.  Work around this problem by advancing
  	 past the NUL chars.  */
        size_t size1 = strlen (s1) + 1;
        size_t size2 = strlen (s2) + 1;
        s1 += size1;
        s2 += size2;
        s1len -= size1;
        s2len -= size2;
  
        if (s1len == 0)
  	{
  	  if (s2len != 0)
  	    diff = -1;
  	  break;
  	}
        else if (s2len == 0)
  	{
  	  diff = 1;
  	  break;
  	}
      }
  
    s1[s1len - 1] = n1;
    s2[s2len - 1] = n2;
  
  #else
  
    diff = memcmp (s1, s2, s1len < s2len ? s1len : s2len);
    if (! diff)
      diff = s1len < s2len ? -1 : s1len != s2len;
    errno = 0;
  
  #endif
  
    return diff;
  }
  

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