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(s, pwcs, n) 48 char * __restrict s; 49 const wchar_t * __restrict pwcs; 50 size_t n; 51 { 52 char buf[MB_LEN_MAX]; 53 char *e; 54 int cnt, nb; 55 56 if (!pwcs || n > INT_MAX) { 57 errno = EINVAL; 58 return (-1); 59 } 60 61 cnt = 0; 62 63 if (s == NULL) { 64 /* Convert and count only, do not store. */ 65 while (*pwcs != L'\0') { 66 if (!sputrune(*pwcs++, buf, MB_LEN_MAX, &e)) { 67 errno = EILSEQ; 68 return (-1); 69 } 70 cnt += e - buf; 71 } 72 return (cnt); 73 } 74 75 /* Convert, store and count characters. */ 76 nb = n; 77 while (nb > 0) { 78 if (*pwcs == 0) { 79 *s = 0; 80 break; 81 } 82 if (!sputrune(*pwcs++, s, nb, &e)) { 83 errno = EILSEQ; 84 return (-1); 85 } 86 if (!e) /* too long */ 87 return (cnt); 88 cnt += e - s; 89 nb -= e - s; 90 s = e; 91 } 92 93 return (cnt); 94 } 95