freebsd-nq/lib/libc/locale/wcstombs.c

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/*-
* 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("$FreeBSD$");
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#include <errno.h>
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#include <stdlib.h>
#include <limits.h>
#include <stddef.h>
#include <rune.h>
size_t
wcstombs(s, pwcs, n)
char * __restrict s;
const wchar_t * __restrict pwcs;
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size_t n;
{
char buf[MB_LEN_MAX];
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char *e;
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int cnt, nb;
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if (!pwcs || n > INT_MAX) {
errno = EINVAL;
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return (-1);
}
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cnt = 0;
if (s == NULL) {
/* Convert and count only, do not store. */
while (*pwcs != L'\0') {
if (!sputrune(*pwcs++, buf, MB_LEN_MAX, &e)) {
errno = EILSEQ;
return (-1);
}
cnt += e - buf;
}
return (cnt);
}
/* Convert, store and count characters. */
nb = n;
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while (nb > 0) {
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if (*pwcs == 0) {
*s = 0;
break;
}
if (!sputrune(*pwcs++, s, nb, &e)) {
errno = EILSEQ;
return (-1);
}
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if (!e) /* too long */
return (cnt);
cnt += e - s;
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nb -= e - s;
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s = e;
}
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return (cnt);
}