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83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Alan Barrett
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* ISO/IEC 9899:2011 section K.3.7.4.1 The memset_s function
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*/
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#include <sys/cdefs.h>
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#define __STDC_WANT_LIB_EXT1__ 1
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#include <errno.h>
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#include <stdint.h>
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#include <string.h>
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/*
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* __memset_vp is a volatile pointer to a function.
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* It is initialised to point to memset, and should never be changed.
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*/
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static void * (* const volatile __memset_vp)(void *, int, size_t)
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= (memset);
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#undef memset_s /* in case it was defined as a macro */
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errno_t
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memset_s(void *s, size_t smax, int c, size_t n)
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{
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errno_t err = 0;
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if (s == NULL) {
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err = EINVAL;
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goto out;
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}
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if (smax > SIZE_MAX) {
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err = E2BIG;
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goto out;
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}
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if (n > SIZE_MAX) {
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err = E2BIG;
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n = smax;
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}
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if (n > smax) {
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err = EOVERFLOW;
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n = smax;
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}
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/* Calling through a volatile pointer should never be optimised away. */
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(*__memset_vp)(s, c, n);
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out:
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if (err == 0)
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return 0;
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else {
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errno = err;
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/* XXX call runtime-constraint handler */
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return err;
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}
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}
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