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 wcstombs(char * __restrict s, const wchar_t * __restrict pwcs, size_t n) 48 { 49 char buf[MB_LEN_MAX]; 50 char *e; 51 int cnt, nb; 52 53 if (pwcs == NULL || n > INT_MAX) { 54 errno = EINVAL; 55 return (-1); 56 } 57 58 cnt = 0; 59 60 if (s == NULL) { 61 /* Convert and count only, do not store. */ 62 while (*pwcs != L'\0') { 63 if (sputrune(*pwcs++, buf, MB_LEN_MAX, &e) == 0) { 64 errno = EILSEQ; 65 return (-1); 66 } 67 cnt += e - buf; 68 } 69 return (cnt); 70 } 71 72 /* Convert, store and count characters. */ 73 nb = n; 74 while (nb > 0) { 75 if (*pwcs == L'\0') { 76 *s = '\0'; 77 break; 78 } 79 if (sputrune(*pwcs++, s, nb, &e) == 0) { 80 errno = EILSEQ; 81 return (-1); 82 } 83 if (e == NULL) /* too long */ 84 return (cnt); 85 cnt += e - s; 86 nb -= e - s; 87 s = e; 88 } 89 90 return (cnt); 91 } 92