1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright 2013 Garrett D'Amore <garrett@damore.org> 5 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 6 * Copyright (c) 2002-2004 Tim J. Robbins. 7 * All rights reserved. 8 * 9 * Copyright (c) 2011 The FreeBSD Foundation 10 * 11 * Portions of this software were developed by David Chisnall 12 * under sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <limits.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <wchar.h> 43 #include "mblocal.h" 44 45 size_t 46 wcsnrtombs_l(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc, 47 size_t len, mbstate_t * __restrict ps, locale_t locale) 48 { 49 FIX_LOCALE(locale); 50 if (ps == NULL) 51 ps = &(XLOCALE_CTYPE(locale)->wcsnrtombs); 52 return (XLOCALE_CTYPE(locale)->__wcsnrtombs(dst, src, nwc, len, ps)); 53 } 54 size_t 55 wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc, 56 size_t len, mbstate_t * __restrict ps) 57 { 58 return wcsnrtombs_l(dst, src, nwc, len, ps, __get_locale()); 59 } 60 61 62 size_t 63 __wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src, 64 size_t nwc, size_t len, mbstate_t * __restrict ps, 65 wcrtomb_pfn_t pwcrtomb) 66 { 67 mbstate_t mbsbak; 68 char buf[MB_LEN_MAX]; 69 const wchar_t *s; 70 size_t nbytes; 71 size_t nb; 72 73 s = *src; 74 nbytes = 0; 75 76 if (dst == NULL) { 77 while (nwc-- > 0) { 78 if ((nb = pwcrtomb(buf, *s, ps)) == (size_t)-1) 79 /* Invalid character - wcrtomb() sets errno. */ 80 return ((size_t)-1); 81 else if (*s == L'\0') 82 return (nbytes + nb - 1); 83 s++; 84 nbytes += nb; 85 } 86 return (nbytes); 87 } 88 89 while (len > 0 && nwc-- > 0) { 90 if (len > (size_t)MB_CUR_MAX) { 91 /* Enough space to translate in-place. */ 92 if ((nb = pwcrtomb(dst, *s, ps)) == (size_t)-1) { 93 *src = s; 94 return ((size_t)-1); 95 } 96 } else { 97 /* 98 * May not be enough space; use temp. buffer. 99 * 100 * We need to save a copy of the conversion state 101 * here so we can restore it if the multibyte 102 * character is too long for the buffer. 103 */ 104 mbsbak = *ps; 105 if ((nb = pwcrtomb(buf, *s, ps)) == (size_t)-1) { 106 *src = s; 107 return ((size_t)-1); 108 } 109 if (nb > (int)len) { 110 /* MB sequence for character won't fit. */ 111 *ps = mbsbak; 112 break; 113 } 114 memcpy(dst, buf, nb); 115 } 116 if (*s == L'\0') { 117 *src = NULL; 118 return (nbytes + nb - 1); 119 } 120 s++; 121 dst += nb; 122 len -= nb; 123 nbytes += nb; 124 } 125 *src = s; 126 return (nbytes); 127 } 128