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/* Locale dependent transformation for case insensitive comparison of Unicode
strings.
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/>. */
char *
FUNC (const UNIT *s, size_t n, const char *iso639_language, uninorm_t nf,
char *resultbuf, size_t *lengthp)
{
UNIT foldedsbuf[2048 / sizeof (UNIT)];
UNIT *foldeds;
size_t foldeds_length;
char convsbuf[2048];
char *convs;
size_t convs_length;
char *result;
/* Casefold and normalize the Unicode string. */
foldeds_length = sizeof (foldedsbuf) / sizeof (UNIT);
foldeds = U_CASEFOLD (s, n, iso639_language, nf, foldedsbuf, &foldeds_length);
if (foldeds == NULL)
/* errno is set here. */
return NULL;
/* Convert it to locale encoding. */
convs_length = sizeof (convsbuf) - 1;
convs = U_CONV_TO_ENCODING (locale_charset (),
iconveh_error,
foldeds, foldeds_length,
NULL,
convsbuf, &convs_length);
if (convs == NULL)
{
if (foldeds != foldedsbuf)
{
int saved_errno = errno;
free (foldeds);
errno = saved_errno;
}
return NULL;
}
if (foldeds != foldedsbuf)
free (foldeds);
/* Ensure one more byte is available. */
if (convs != convsbuf)
{
char *memory = (char *) realloc (convs, convs_length + 1);
if (memory == NULL)
{
free (convs);
errno = ENOMEM;
return NULL;
}
convs = memory;
}
/* Apply locale dependent transformations for comparison. */
result = amemxfrm (convs, convs_length, resultbuf, lengthp);
if (result == NULL)
{
if (convs != convsbuf)
{
int saved_errno = errno;
free (convs);
errno = saved_errno;
}
return NULL;
}
if (convs != convsbuf)
free (convs);
return result;
}
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