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/* Transform wide string for comparison using the current locale.
Copyright (C) 2011 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2011.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
size_t
wcsxfrm (wchar_t *s1, const wchar_t *s2, size_t n)
{
char mbbuf2[1024];
char *mbs2;
{
int saved_errno = errno;
size_t result;
/* Convert s2 to a multibyte string, trying to avoid malloc(). */
{
size_t ret;
ret = wcstombs (mbbuf2, s2, sizeof (mbbuf2));
if (ret == (size_t)-1)
goto failed;
if (ret < sizeof (mbbuf2))
mbs2 = mbbuf2;
else
{
size_t need = wcstombs (NULL, s2, 0);
if (need == (size_t)-1)
goto failed;
mbs2 = (char *) malloc (need + 1);
if (mbs2 == NULL)
goto out_of_memory;
ret = wcstombs (mbs2, s2, need + 1);
if (ret != need)
abort ();
}
}
/* Transform the multibyte string. */
errno = 0;
result = strxfrm ((char *)s1, mbs2, n);
if (errno != 0)
{
/* An error occurred. */
if (mbs2 != mbbuf2)
{
saved_errno = errno;
free (mbs2);
errno = saved_errno;
}
return 0;
}
if (result < n)
{
/* Convert the result by mapping char[] -> wchar_t[].
Since strcmp() compares the elements as 'unsigned char' values,
whereas wcscmp() compares the elements as 'wchar_t' values, we need
to map 1 'unsigned char' to 1 'wchar_t'. (We could also map 2
consecutive 'unsigned char' values to 1 'wchar_t' value, but this is
not needed. */
wchar_t *wcp = s1 + n;
char *cp = (char *)s1 + n;
while (wcp > s1)
*--wcp = (wchar_t) (unsigned char) *--cp;
}
if (mbs2 != mbbuf2)
free (mbs2);
/* No error. */
errno = saved_errno;
return result;
}
out_of_memory:
errno = ENOMEM;
return 0;
failed:
errno = EILSEQ;
return 0;
}
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