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/* Locale dependent memory area transformation for comparison.
Copyright (C) 2009 Free Software Foundation, Inc.
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/>. */
#ifndef MEMXFRM_H
#define MEMXFRM_H
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Generalization of strxfrm() to strings with embedded NUL bytes. */
/* Transform the memory area [S..S+N-1] to a memory area, in such a way that
comparing (S1,N1) and (S2,N2) with memcoll() is equivalent to comparing
memxfrm(S1,N1) and memxfrm(S2,N2) with memcmp2().
The byte S[N] may be temporarily overwritten by this function, but will be
restored before this function returns.
The result of this function depends on the LC_COLLATE category of the
current locale.
If successful: If resultbuf is not NULL and the result fits into *lengthp
bytes, it is put in resultbuf, and resultbuf is returned. Otherwise, a
freshly allocated string is returned. In both cases, *lengthp is set to the
length of the returned string.
Upon failure, return NULL, with errno set. */
extern char * memxfrm (char *s, size_t n, char *resultbuf, size_t *lengthp);
#ifdef __cplusplus
}
#endif
#endif /* MEMXFRM_H */
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