1 /*- 2 * Copyright (c) 2002 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("$FreeBSD$"); 29 30 #include <errno.h> 31 #include <limits.h> 32 #include <stdlib.h> 33 #include <wchar.h> 34 35 size_t 36 mbsrtowcs(wchar_t *__restrict dst, const char **__restrict src, size_t len, 37 mbstate_t *__restrict ps __unused) 38 { 39 const char *s; 40 size_t nchr; 41 wchar_t wc; 42 int nb; 43 44 s = *src; 45 nchr = 0; 46 47 if (dst == NULL) { 48 for (;;) { 49 if ((nb = (int)mbrtowc(&wc, s, MB_CUR_MAX, NULL)) < 0) 50 /* Invalid sequence - mbrtowc() sets errno. */ 51 return ((size_t)-1); 52 else if (nb == 0) 53 return (nchr); 54 s += nb; 55 nchr++; 56 } 57 /*NOTREACHED*/ 58 } 59 60 while (len-- > 0) { 61 if ((nb = (int)mbrtowc(dst, s, MB_CUR_MAX, NULL)) < 0) { 62 *src = s; 63 return ((size_t)-1); 64 } else if (nb == 0) { 65 *src = NULL; 66 return (nchr); 67 } 68 s += nb; 69 nchr++; 70 dst++; 71 } 72 *src = s; 73 return (nchr); 74 } 75