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/*
* Copyright (c) 2013-2014 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sys/types.h>
#include <errno.h>
#include <limits.h>
#if defined(HAVE_STDINT_H)
# include <stdint.h>
#elif defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#endif
#include "sudo_compat.h"
#ifndef RSIZE_MAX
# if defined(SIZE_MAX)
# define RSIZE_MAX (SIZE_MAX >> 1)
# elif defined(__LP64__)
# define RSIZE_MAX 0x7fffffffffffffffUL
# else
# define RSIZE_MAX 0x7fffffffU
# endif
#endif
/*
* Simple implementation of C11 memset_s() function.
* We use a volatile pointer when updating the byte string.
* Most compilers will avoid optimizing away access to a
* volatile pointer, even if the pointer appears to be unused
* after the call.
*
* Note that C11 does not specify the return value on error, only
* that it be non-zero. We use EINVAL for all errors.
*/
errno_t
sudo_memset_s(void *v, rsize_t smax, int c, rsize_t n)
{
errno_t ret = 0;
volatile unsigned char *s = v;
/* Fatal runtime-constraint violations. */
if (s == NULL || smax > RSIZE_MAX) {
ret = errno = EINVAL;
goto done;
}
/* Non-fatal runtime-constraint violation, n must not exceed smax. */
if (n > smax) {
n = smax;
ret = errno = EINVAL;
}
/* Updating through a volatile pointer should not be optimized away. */
while (n--)
*s++ = (unsigned char)c;
done:
return ret;
}
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