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 <string.h> 34 #include <wchar.h> 35 36 size_t 37 wcsrtombs(char *__restrict dst, const wchar_t **__restrict src, size_t len, 38 mbstate_t *__restrict ps __unused) 39 { 40 char buf[MB_LEN_MAX]; 41 const wchar_t *s; 42 size_t nbytes; 43 int nb; 44 45 s = *src; 46 nbytes = 0; 47 48 if (dst == NULL) { 49 for (;;) { 50 if ((nb = (int)wcrtomb(buf, *s, NULL)) < 0) 51 /* Invalid character - wcrtomb() sets errno. */ 52 return ((size_t)-1); 53 else if (*s == L'\0') 54 return (nbytes + nb - 1); 55 s++; 56 nbytes += nb; 57 } 58 /*NOTREACHED*/ 59 } 60 61 while (len > 0) { 62 if (len > (size_t)MB_CUR_MAX) { 63 /* Enough space to translate in-place. */ 64 if ((nb = (int)wcrtomb(dst, *s, NULL)) < 0) { 65 *src = s; 66 return ((size_t)-1); 67 } 68 } else { 69 /* May not be enough space; use temp. buffer. */ 70 if ((nb = (int)wcrtomb(buf, *s, NULL)) < 0) { 71 *src = s; 72 return ((size_t)-1); 73 } 74 if (nb > (int)len) 75 /* MB sequence for character won't fit. */ 76 break; 77 memcpy(dst, buf, nb); 78 } 79 if (*s == L'\0') { 80 *src = NULL; 81 return (nbytes + nb - 1); 82 } 83 s++; 84 dst += nb; 85 len -= nb; 86 nbytes += nb; 87 } 88 *src = s; 89 return (nbytes); 90 } 91