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/* Locale dependent memory area transformation for comparison.
Copyright (C) 2009-2024 Free Software Foundation, Inc.
This file 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 2.1 of the
License, or (at your option) any later version.
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 for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef AMEMXFRM_H
#define AMEMXFRM_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
amemxfrm(S1,N1) and amemxfrm(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 * amemxfrm (char *restrict s, size_t n,
char *restrict resultbuf, size_t *lengthp);
#ifdef __cplusplus
}
#endif
#endif /* AMEMXFRM_H */
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