/* * Copyright (c) 2016 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #include <string.h> #include <sys/errno.h> #include <stdint.h> extern void *secure_memset(void *, int, size_t); /* * The memset_s function copies the value c into the first n bytes * pointed by s. No more than smax bytes will be copied. * * In contrast to the memset function, calls to memset_s will never * be ''optimised away'' by a compiler, ensuring the memory copy * even if s is not accessed anymore after this call. */ int memset_s(void *s, size_t smax, int c, size_t n) { int err = 0; if (s == NULL) return EINVAL; if (smax > RSIZE_MAX) return E2BIG; if (n > smax) { n = smax; err = EOVERFLOW; } /* * secure_memset is defined in assembly, we therefore * expect that the compiler will not inline the call. */ secure_memset(s, c, n); return err; }