mirror of
https://github.com/rsmarples/dhcpcd.git
synced 2024-11-23 18:14:09 +08:00
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/* $NetBSD: reallocarr.c,v 1.4 2015/08/20 20:08:04 joerg 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.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
|
|
/*
|
|
* To be clear, this is NetBSD's more refined reallocarr(3) function
|
|
* made to look like OpenBSD's more useable reallocarray(3) interface.
|
|
*/
|
|
#include "reallocarray.h"
|
|
|
|
#define SQRT_SIZE_MAX (((size_t)1) << (sizeof(size_t) * CHAR_BIT / 2))
|
|
void *
|
|
reallocarray(void *ptr, size_t n, size_t size)
|
|
{
|
|
|
|
/*
|
|
* 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 ((n | size) >= SQRT_SIZE_MAX && n > SIZE_MAX / size) {
|
|
errno = EOVERFLOW;
|
|
return NULL;
|
|
}
|
|
return realloc(ptr, n * size);
|
|
}
|