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