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 <limits.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <wchar.h> 34 #include "mblocal.h" 35 36 size_t 37 wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc, 38 size_t len, mbstate_t * __restrict ps) 39 { 40 static mbstate_t mbs; 41 42 if (ps == NULL) 43 ps = &mbs; 44 return (__wcsnrtombs(dst, src, nwc, len, ps)); 45 } 46 47 size_t 48 __wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src, 49 size_t nwc, size_t len, mbstate_t * __restrict ps) 50 { 51 mbstate_t mbsbak; 52 char buf[MB_LEN_MAX]; 53 const wchar_t *s; 54 size_t nbytes; 55 size_t nb; 56 57 s = *src; 58 nbytes = 0; 59 60 if (dst == NULL) { 61 while (nwc-- > 0) { 62 if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1) 63 /* Invalid character - wcrtomb() sets errno. */ 64 return ((size_t)-1); 65 else if (*s == L'\0') 66 return (nbytes + nb - 1); 67 s++; 68 nbytes += nb; 69 } 70 return (nbytes); 71 } 72 73 while (len > 0 && nwc-- > 0) { 74 if (len > (size_t)MB_CUR_MAX) { 75 /* Enough space to translate in-place. */ 76 if ((nb = __wcrtomb(dst, *s, ps)) == (size_t)-1) { 77 *src = s; 78 return ((size_t)-1); 79 } 80 } else { 81 /* 82 * May not be enough space; use temp. buffer. 83 * 84 * We need to save a copy of the conversion state 85 * here so we can restore it if the multibyte 86 * character is too long for the buffer. 87 */ 88 mbsbak = *ps; 89 if ((nb = __wcrtomb(buf, *s, ps)) == (size_t)-1) { 90 *src = s; 91 return ((size_t)-1); 92 } 93 if (nb > (int)len) { 94 /* MB sequence for character won't fit. */ 95 *ps = mbsbak; 96 break; 97 } 98 memcpy(dst, buf, nb); 99 } 100 if (*s == L'\0') { 101 *src = NULL; 102 return (nbytes + nb - 1); 103 } 104 s++; 105 dst += nb; 106 len -= nb; 107 nbytes += nb; 108 } 109 *src = s; 110 return (nbytes); 111 } 112