freebsd-dev/lib/libc/locale/mbstowcs.c

89 lines
2.7 KiB
C

/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Paul Borman at Krystal Technologies.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <stddef.h>
#include <rune.h>
size_t
mbstowcs(wchar_t * __restrict pwcs, const char * __restrict s, size_t n)
{
const char *e;
int cnt;
rune_t r;
if (s == NULL) {
errno = EINVAL;
return (-1);
}
if (pwcs == NULL) {
/* Convert and count only, do not store. */
cnt = 0;
while ((r = sgetrune(s, MB_LEN_MAX, &e)) != _INVALID_RUNE &&
r != 0) {
s = e;
cnt++;
}
if (r == _INVALID_RUNE) {
errno = EILSEQ;
return (-1);
}
return (cnt);
}
/* Convert, store and count characters. */
cnt = 0;
while (n-- > 0) {
*pwcs = sgetrune(s, MB_LEN_MAX, &e);
if (*pwcs == _INVALID_RUNE) {
errno = EILSEQ;
return (-1);
}
if (*pwcs++ == L'\0')
break;
s = e;
++cnt;
}
return (cnt);
}