1 /*- 2 * Copyright (c) 2017 Juniper Networks. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD: head/lib/libc/string/memset_s.c 322427 2017-08-12 15:18:17Z kib $ 26 */ 27 28 #include <errno.h> 29 #include <stddef.h> 30 #include <stdint.h> 31 #include <string.h> 32 #include "libc_private.h" 33 34 /* ISO/IEC 9899:2011 K.3.7.4.1 */ 35 errno_t 36 memset_s(void *s, rsize_t smax, int c, rsize_t n) 37 { 38 errno_t ret; 39 rsize_t lim; 40 unsigned char v; 41 volatile unsigned char *dst; 42 43 ret = EINVAL; 44 lim = n < smax ? n : smax; 45 v = (unsigned char)c; 46 dst = (unsigned char *)s; 47 if (s == NULL) { 48 __throw_constraint_handler_s("memset_s : s is NULL", ret); 49 } else if (smax > RSIZE_MAX) { 50 __throw_constraint_handler_s("memset_s : smax > RSIZE_MAX", 51 ret); 52 } else if (n > RSIZE_MAX) { 53 __throw_constraint_handler_s("memset_s : n > RSIZE_MAX", ret); 54 } else { 55 while (lim > 0) 56 dst[--lim] = v; 57 if (n > smax) { 58 __throw_constraint_handler_s("memset_s : n > smax", 59 ret); 60 } else { 61 ret = 0; 62 } 63 } 64 return (ret); 65 } 66