112 lines
3.0 KiB
C
112 lines
3.0 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 <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include "mblocal.h"
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size_t
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wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
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size_t len, mbstate_t * __restrict ps)
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{
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static mbstate_t mbs;
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if (ps == NULL)
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ps = &mbs;
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return (__wcsnrtombs(dst, src, nwc, len, ps));
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}
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size_t
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__wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src,
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size_t nwc, size_t len, mbstate_t * __restrict ps)
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{
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mbstate_t mbsbak;
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char buf[MB_LEN_MAX];
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const wchar_t *s;
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size_t nbytes;
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size_t nb;
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s = *src;
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nbytes = 0;
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if (dst == NULL) {
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while (nwc-- > 0) {
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if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1)
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/* Invalid character - wcrtomb() sets errno. */
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return ((size_t)-1);
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else if (*s == L'\0')
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return (nbytes + nb - 1);
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s++;
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nbytes += nb;
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}
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return (nbytes);
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}
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while (len > 0 && nwc-- > 0) {
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if (len > (size_t)MB_CUR_MAX) {
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/* Enough space to translate in-place. */
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if ((nb = (int)__wcrtomb(dst, *s, ps)) < 0) {
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*src = s;
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return ((size_t)-1);
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}
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} else {
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/*
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* May not be enough space; use temp. buffer.
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*
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* We need to save a copy of the conversion state
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* here so we can restore it if the multibyte
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* character is too long for the buffer.
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*/
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mbsbak = *ps;
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if ((nb = (int)__wcrtomb(buf, *s, ps)) < 0) {
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*src = s;
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return ((size_t)-1);
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}
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if (nb > (int)len) {
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/* MB sequence for character won't fit. */
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*ps = mbsbak;
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break;
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}
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memcpy(dst, buf, nb);
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}
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if (*s == L'\0') {
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*src = NULL;
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return (nbytes + nb - 1);
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}
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s++;
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dst += nb;
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len -= nb;
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nbytes += nb;
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}
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*src = s;
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return (nbytes);
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}
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