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/* 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;
}
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