mbsrtowcs.c revision 127944
1/*- 2 * Copyright (c) 2002-2004 Tim J. Robbins. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/lib/libc/locale/mbsrtowcs.c 127944 2004-04-06 13:14:03Z tjr $"); 29 30#include <errno.h> 31#include <limits.h> 32#include <stdlib.h> 33#include <wchar.h> 34 35size_t 36mbsrtowcs(wchar_t * __restrict dst, const char ** __restrict src, size_t len, 37 mbstate_t * __restrict ps) 38{ 39 static mbstate_t mbs; 40 const char *s; 41 size_t nchr; 42 wchar_t wc; 43 int nb; 44 45 s = *src; 46 nchr = 0; 47 48 if (ps == NULL) 49 ps = &mbs; 50 if (dst == NULL) { 51 for (;;) { 52 if ((nb = (int)mbrtowc(&wc, s, MB_CUR_MAX, ps)) < 0) 53 /* Invalid sequence - mbrtowc() sets errno. */ 54 return ((size_t)-1); 55 else if (nb == 0) 56 return (nchr); 57 s += nb; 58 nchr++; 59 } 60 /*NOTREACHED*/ 61 } 62 63 while (len-- > 0) { 64 if ((nb = (int)mbrtowc(dst, s, MB_CUR_MAX, ps)) < 0) { 65 *src = s; 66 return ((size_t)-1); 67 } else if (nb == 0) { 68 *src = NULL; 69 return (nchr); 70 } 71 s += nb; 72 nchr++; 73 dst++; 74 } 75 *src = s; 76 return (nchr); 77} 78