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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
commitfa095a4504cbe668e4244547e2c141597bea4ecf (patch)
tree06135820a286ffec47804e75fbf8a147e92acd2e /lib/unistr/u-strcoll.h
Imported Upstream version 0.9.1upstream/0.9.1
Diffstat (limited to 'lib/unistr/u-strcoll.h')
-rw-r--r--lib/unistr/u-strcoll.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/lib/unistr/u-strcoll.h b/lib/unistr/u-strcoll.h
new file mode 100644
index 00000000..af404a04
--- /dev/null
+++ b/lib/unistr/u-strcoll.h
@@ -0,0 +1,81 @@
+/* Compare UTF-8/UTF-16/UTF-32 strings using the collation rules of the current
+ locale.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+int
+FUNC (const UNIT *s1, const UNIT *s2)
+{
+ /* When this function succeeds, it sets errno back to its original value.
+ When it fails, it sets errno, but also returns a meaningful return value,
+ for the sake of callers which ignore errno. */
+ int final_errno = errno;
+ char *sl1;
+ char *sl2;
+ int result;
+
+ sl1 = U_STRCONV_TO_LOCALE (s1);
+ if (sl1 != NULL)
+ {
+ sl2 = U_STRCONV_TO_LOCALE (s2);
+ if (sl2 != NULL)
+ {
+ /* Compare sl1 and sl2. */
+ errno = 0;
+ result = strcoll (sl1, sl2);
+ if (errno == 0)
+ {
+ /* strcoll succeeded. */
+ free (sl1);
+ free (sl2);
+ }
+ else
+ {
+ /* strcoll failed. */
+ final_errno = errno;
+ free (sl1);
+ free (sl2);
+ result = U_STRCMP (s1, s2);
+ }
+ }
+ else
+ {
+ /* s1 could be converted to locale encoding, s2 not. */
+ final_errno = errno;
+ free (sl1);
+ result = -1;
+ }
+ }
+ else
+ {
+ final_errno = errno;
+ sl2 = U_STRCONV_TO_LOCALE (s2);
+ if (sl2 != NULL)
+ {
+ /* s2 could be converted to locale encoding, s1 not. */
+ free (sl2);
+ result = 1;
+ }
+ else
+ {
+ /* Neither s1 nor s2 could be converted to locale encoding. */
+ result = U_STRCMP (s1, s2);
+ }
+ }
+
+ errno = final_errno;
+ return result;
+}