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("$FreeBSD$"); 29 30 #include <errno.h> 31 #include <limits.h> 32 #include <stdlib.h> 33 #include <wchar.h> 34 #include "mblocal.h" 35 36 size_t 37 mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src, 38 size_t nms, size_t len, mbstate_t * __restrict ps) 39 { 40 static mbstate_t mbs; 41 42 if (ps == NULL) 43 ps = &mbs; 44 return (__mbsnrtowcs(dst, src, nms, len, ps)); 45 } 46 47 size_t 48 __mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src, 49 size_t nms, size_t len, mbstate_t * __restrict ps) 50 { 51 const char *s; 52 size_t nchr; 53 wchar_t wc; 54 size_t nb; 55 56 s = *src; 57 nchr = 0; 58 59 if (dst == NULL) { 60 for (;;) { 61 if ((nb = __mbrtowc(&wc, s, nms, ps)) == (size_t)-1) 62 /* Invalid sequence - mbrtowc() sets errno. */ 63 return ((size_t)-1); 64 else if (nb == 0 || nb == (size_t)-2) 65 return (nchr); 66 s += nb; 67 nms -= nb; 68 nchr++; 69 } 70 /*NOTREACHED*/ 71 } 72 73 while (len-- > 0) { 74 if ((nb = __mbrtowc(dst, s, nms, ps)) == (size_t)-1) { 75 *src = s; 76 return ((size_t)-1); 77 } else if (nb == (size_t)-2) { 78 *src = s + nms; 79 return (nchr); 80 } else if (nb == 0) { 81 *src = NULL; 82 return (nchr); 83 } 84 s += nb; 85 nms -= nb; 86 nchr++; 87 dst++; 88 } 89 *src = s; 90 return (nchr); 91 } 92