1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Paul Borman at Krystal Technologies. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <errno.h> 41 #include <stdlib.h> 42 #include <limits.h> 43 #include <stddef.h> 44 #include <rune.h> 45 46 size_t 47 mbstowcs(wchar_t * __restrict pwcs, const char * __restrict s, size_t n) 48 { 49 const char *e; 50 int cnt; 51 rune_t r; 52 53 if (s == NULL) { 54 errno = EINVAL; 55 return (-1); 56 } 57 58 if (pwcs == NULL) { 59 /* Convert and count only, do not store. */ 60 cnt = 0; 61 while ((r = sgetrune(s, MB_LEN_MAX, &e)) != _INVALID_RUNE && 62 r != 0) { 63 s = e; 64 cnt++; 65 } 66 if (r == _INVALID_RUNE) { 67 errno = EILSEQ; 68 return (-1); 69 } 70 return (cnt); 71 } 72 73 /* Convert, store and count characters. */ 74 cnt = 0; 75 while (n-- > 0) { 76 *pwcs = sgetrune(s, MB_LEN_MAX, &e); 77 if (*pwcs == _INVALID_RUNE) { 78 errno = EILSEQ; 79 return (-1); 80 } 81 if (*pwcs++ == L'\0') 82 break; 83 s = e; 84 ++cnt; 85 } 86 87 return (cnt); 88 } 89