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/* $NetBSD: reallocarr.c,v 1.5 2015/08/20 22:27:49 kamil Exp $ */
/*-
* Copyright (c) 2015 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
__RCSID("$NetBSD: reallocarr.c,v 1.5 2015/08/20 22:27:49 kamil Exp $");
#include "namespace.h"
#include <errno.h>
/* Old POSIX has SIZE_MAX in limits.h */
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#ifdef _LIBC
#ifdef __weak_alias
__weak_alias(reallocarr, _reallocarr)
#endif
#endif
#define SQRT_SIZE_MAX (((size_t)1) << (sizeof(size_t) * CHAR_BIT / 2))
#if !HAVE_REALLOCARR
int
reallocarr(void *ptr, size_t number, size_t size)
{
int saved_errno, result;
void *optr;
void *nptr;
saved_errno = errno;
memcpy(&optr, ptr, sizeof(ptr));
if (number == 0 || size == 0) {
free(optr);
nptr = NULL;
memcpy(ptr, &nptr, sizeof(ptr));
errno = saved_errno;
return 0;
}
/*
* Try to avoid division here.
*
* It isn't possible to overflow during multiplication if neither
* operand uses any of the most significant half of the bits.
*/
if (__predict_false((number|size) >= SQRT_SIZE_MAX &&
number > SIZE_MAX / size)) {
errno = saved_errno;
return EOVERFLOW;
}
nptr = realloc(optr, number * size);
if (__predict_false(nptr == NULL)) {
result = errno;
} else {
result = 0;
memcpy(ptr, &nptr, sizeof(ptr));
}
errno = saved_errno;
return result;
}
#endif
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