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/* Compare UTF-8/UTF-16/UTF-32 strings using the collation rules of the current
locale.
Copyright (C) 2009-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2009.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- 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, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://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;
const char *encoding = locale_charset ();
char *sl1;
char *sl2;
int result;
/* Pass iconveh_error here, not iconveh_question_mark. Otherwise the
conversion to locale encoding can do transliteration or map some
characters to question marks, leading to results that depend on the
iconv() implementation and are not obvious. */
sl1 = U_STRCONV_TO_ENCODING (s1, encoding, iconveh_error);
if (sl1 != NULL)
{
sl2 = U_STRCONV_TO_ENCODING (s2, encoding, iconveh_error);
if (sl2 != NULL)
{
/* Compare sl1 and sl2. */
errno = 0;
result = strcoll (sl1, sl2);
if (errno == 0)
{
/* strcoll succeeded. */
free (sl1);
free (sl2);
/* The conversion to locale encoding can drop Unicode TAG
characters. Therefore sl1 and sl2 may be equal when s1
and s2 were in fact different. Return a nonzero result
in this case. */
if (result == 0)
result = U_STRCMP (s1, s2);
}
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_ENCODING (s2, encoding, iconveh_error);
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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