80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
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/* Locale-specific memory comparison.
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Copyright 1999, 2002 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Contributed by Paul Eggert <eggert@twinsun.com>. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include <sys/types.h>
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#if HAVE_STRING_H
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# include <string.h>
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#endif
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/* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
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to the LC_COLLATE locale. S1 and S2 do not overlap, and are not
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adjacent. Temporarily modify the bytes after S1 and S2, but
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restore their original contents before returning. Set errno to an
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error number if there is an error, and to zero otherwise. */
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int
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memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
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{
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int diff;
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char n1 = s1[s1len];
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char n2 = s2[s2len];
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s1[s1len++] = '\0';
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s2[s2len++] = '\0';
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while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))
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{
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/* strcoll found no difference, but perhaps it was fooled by NUL
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characters in the data. Work around this problem by advancing
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past the NUL chars. */
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size_t size1 = strlen (s1) + 1;
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size_t size2 = strlen (s2) + 1;
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s1 += size1;
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s2 += size2;
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s1len -= size1;
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s2len -= size2;
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if (s1len == 0)
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{
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if (s2len != 0)
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diff = -1;
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break;
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}
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else if (s2len == 0)
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{
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diff = 1;
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break;
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}
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}
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s1[s1len - 1] = n1;
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s2[s2len - 1] = n2;
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return diff;
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}
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