mbsrtowcs.c revision 129154
138363Swpaul/*- 238363Swpaul * Copyright (c) 2002-2004 Tim J. Robbins. 338363Swpaul * All rights reserved. 438363Swpaul * 538363Swpaul * Redistribution and use in source and binary forms, with or without 638363Swpaul * modification, are permitted provided that the following conditions 738363Swpaul * are met: 838363Swpaul * 1. Redistributions of source code must retain the above copyright 938363Swpaul * notice, this list of conditions and the following disclaimer. 1038363Swpaul * 2. Redistributions in binary form must reproduce the above copyright 1138363Swpaul * notice, this list of conditions and the following disclaimer in the 1238363Swpaul * documentation and/or other materials provided with the distribution. 1338363Swpaul * 1438363Swpaul * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1538363Swpaul * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1638363Swpaul * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1738363Swpaul * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1838363Swpaul * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1938363Swpaul * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2038363Swpaul * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2138363Swpaul * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2238363Swpaul * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2338363Swpaul * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2438363Swpaul * SUCH DAMAGE. 2538363Swpaul */ 2638363Swpaul 2738363Swpaul#include <sys/cdefs.h> 2838363Swpaul__FBSDID("$FreeBSD: head/lib/libc/locale/mbsrtowcs.c 129154 2004-05-12 14:26:54Z tjr $"); 2938363Swpaul 3038363Swpaul#include <errno.h> 3138363Swpaul#include <limits.h> 3246204Swpaul#include <stdlib.h> 3338363Swpaul#include <wchar.h> 3438363Swpaul#include "mblocal.h" 3538363Swpaul 3638363Swpaulsize_t 3738363Swpaulmbsrtowcs(wchar_t * __restrict dst, const char ** __restrict src, size_t len, 3838363Swpaul mbstate_t * __restrict ps) 3938363Swpaul{ 4038363Swpaul static mbstate_t mbs; 4138363Swpaul const char *s; 4238363Swpaul size_t nchr; 4338363Swpaul wchar_t wc; 4438363Swpaul int nb; 4538363Swpaul 4638363Swpaul s = *src; 4738363Swpaul nchr = 0; 4838363Swpaul 4938363Swpaul if (ps == NULL) 5038363Swpaul ps = &mbs; 5138363Swpaul if (dst == NULL) { 5238363Swpaul for (;;) { 5338363Swpaul if ((nb = (int)__mbrtowc(&wc, s, MB_CUR_MAX, ps)) < 0) 5438363Swpaul /* Invalid sequence - mbrtowc() sets errno. */ 5538363Swpaul return ((size_t)-1); 5638363Swpaul else if (nb == 0) 5738363Swpaul return (nchr); 5838363Swpaul s += nb; 5938363Swpaul nchr++; 6038363Swpaul } 6138363Swpaul /*NOTREACHED*/ 6238363Swpaul } 6338363Swpaul 6438363Swpaul while (len-- > 0) { 6538363Swpaul if ((nb = (int)__mbrtowc(dst, s, MB_CUR_MAX, ps)) < 0) { 6638363Swpaul *src = s; 6738363Swpaul return ((size_t)-1); 6838363Swpaul } else if (nb == 0) { 6938363Swpaul *src = NULL; 7038363Swpaul return (nchr); 7138363Swpaul } 7238363Swpaul s += nb; 7338363Swpaul nchr++; 7438363Swpaul dst++; 7538363Swpaul } 7638363Swpaul *src = s; 7738363Swpaul return (nchr); 7838363Swpaul} 7938363Swpaul