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/* Test whether case matters for a Unicode string.
Copyright (C) 2009-2026 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 *s, size_t n, const char *iso639_language,
bool *resultp)
{
/* Apply canonical decomposition to S. */
UNIT normsbuf[2048 / sizeof (UNIT)];
size_t norms_length = sizeof (normsbuf) / sizeof (UNIT);
UNIT *norms = U_NORMALIZE (UNINORM_NFD, s, n, normsbuf, &norms_length);
if (norms == NULL)
/* errno is set here. */
return -1;
UNIT mappedbuf[2048 / sizeof (UNIT)];
size_t mapped_length = sizeof (mappedbuf) / sizeof (UNIT);
/* Apply toupper mapping. */
UNIT *mapped_toupper = U_TOUPPER (norms, norms_length, iso639_language, NULL,
mappedbuf, &mapped_length);
if (mapped_toupper == NULL)
goto fail;
/* Compare. */
if (!(mapped_length == norms_length
&& U_CMP (mapped_toupper, norms, norms_length) == 0))
{
if (mapped_toupper != mappedbuf)
free (mapped_toupper);
goto yes;
}
/* Apply tolower mapping. */
UNIT *mapped_tolower = U_TOLOWER (norms, norms_length, iso639_language, NULL,
mapped_toupper, &mapped_length);
if (mapped_tolower == NULL)
{
if (mapped_toupper != mappedbuf)
{
int saved_errno = errno;
free (mapped_toupper);
errno = saved_errno;
}
goto fail;
}
if (mapped_toupper != mapped_tolower && mapped_toupper != mappedbuf)
free (mapped_toupper);
/* Compare. */
if (!(mapped_length == norms_length
&& U_CMP (mapped_tolower, norms, norms_length) == 0))
{
if (mapped_tolower != mappedbuf)
free (mapped_tolower);
goto yes;
}
/* Apply totitle mapping. */
UNIT *mapped_totitle = U_TOTITLE (norms, norms_length, iso639_language, NULL,
mapped_tolower, &mapped_length);
if (mapped_totitle == NULL)
{
if (mapped_tolower != mappedbuf)
{
int saved_errno = errno;
free (mapped_tolower);
errno = saved_errno;
}
goto fail;
}
if (mapped_tolower != mapped_totitle && mapped_tolower != mappedbuf)
free (mapped_tolower);
/* Compare. */
if (!(mapped_length == norms_length
&& U_CMP (mapped_totitle, norms, norms_length) == 0))
{
if (mapped_totitle != mappedbuf)
free (mapped_totitle);
goto yes;
}
if (mapped_totitle != mappedbuf)
free (mapped_totitle);
if (norms != normsbuf)
free (norms);
*resultp = false;
return 0;
yes:
if (norms != normsbuf)
free (norms);
*resultp = true;
return 0;
fail:
if (norms != normsbuf)
{
int saved_errno = errno;
free (norms);
errno = saved_errno;
}
return -1;
}
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