lib/xmemcoll.c

   1 /* Locale-specific memory comparison.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Contributed by Paul Eggert <eggert@twinsun.com>.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <errno.h>
  25 #ifndef errno
  26 extern int errno;
  27 #endif
  28
  29 #include <stdlib.h>
  30
  31 #if ENABLE_NLS
  32 # include <libintl.h>
  33 # define _(Text) gettext (Text)
  34 #else
  35 # define _(Text) Text
  36 #endif
  37
  38 #include "error.h"
  39 #include "memcoll.h"
  40 #include "quotearg.h"
  41 #include "xmemcoll.h"
  42
  43 /* Exit value when xmemcoll fails.
  44    The caller may set it to some other value.  */
  45 int xmemcoll_exit_failure = EXIT_FAILURE;
  46
  47 /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
  48    to the LC_COLLATE locale.  S1 and S2 do not overlap, and are not
  49    adjacent.  Temporarily modify the bytes after S1 and S2, but
  50    restore their original contents before returning.  Report an error
  51    and exit if there is an error.  */
  52
  53 int
  54 xmemcoll (char *s1, size_t s1len, char *s2, size_t s2len)
  55 {
  56   int diff = memcoll (s1, s1len, s2, s2len);
  57   int collation_errno = errno;
  58
  59   if (collation_errno)
  60     {
  61       error (0, collation_errno, _("string comparison failed"));
  62       error (0, 0, _("Set LC_ALL='C' to work around the problem."));
  63       error (xmemcoll_exit_failure, 0,
  64              _("The strings compared were %s and %s."),
  65              quotearg_n_style_mem (0, locale_quoting_style, s1, s1len),
  66              quotearg_n_style_mem (1, locale_quoting_style, s2, s2len));
  67     }
  68
  69   return diff;
  70 }