aboutsummaryrefslogtreecommitdiffstats
path: root/lib/memcoll.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/memcoll.c')
-rw-r--r--lib/memcoll.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/memcoll.c b/lib/memcoll.c
new file mode 100644
index 000000000000..e777e6a5bc7f
--- /dev/null
+++ b/lib/memcoll.c
@@ -0,0 +1,85 @@
+/* Locale-specific memory comparison.
+ Copyright (C) 1999, 2002, 2003, 2004 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>
+#include <string.h>
+
+/* 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;
+}