78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*-
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* Copyright (c) 2002-2004 Tim J. Robbins.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <limits.h>
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#include <stdlib.h>
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#include <wchar.h>
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size_t
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mbsrtowcs(wchar_t * __restrict dst, const char ** __restrict src, size_t len,
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mbstate_t * __restrict ps)
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{
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static mbstate_t mbs;
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const char *s;
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size_t nchr;
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wchar_t wc;
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int nb;
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s = *src;
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nchr = 0;
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if (ps == NULL)
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ps = &mbs;
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if (dst == NULL) {
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for (;;) {
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if ((nb = (int)mbrtowc(&wc, s, MB_CUR_MAX, ps)) < 0)
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/* Invalid sequence - mbrtowc() sets errno. */
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return ((size_t)-1);
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else if (nb == 0)
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return (nchr);
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s += nb;
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nchr++;
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}
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/*NOTREACHED*/
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}
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while (len-- > 0) {
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if ((nb = (int)mbrtowc(dst, s, MB_CUR_MAX, ps)) < 0) {
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*src = s;
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return ((size_t)-1);
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} else if (nb == 0) {
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*src = NULL;
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return (nchr);
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}
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s += nb;
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nchr++;
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dst++;
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}
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*src = s;
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return (nchr);
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}
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