mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-19 12:59:21 +08:00
588a5e1dde
This built-in function (available in both gcc and clang) is more efficient and generates shorter code than open-coding the test. Signed-off-by: Keith Packard <keithp@keithp.com>
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
/* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */
|
|
/*
|
|
* Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/types.h>
|
|
#include <errno.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
|
|
void *
|
|
reallocarray(void *optr, size_t nmemb, size_t size)
|
|
{
|
|
ptrdiff_t bytes;
|
|
|
|
if (__builtin_mul_overflow (nmemb, size, &bytes))
|
|
{
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
return realloc(optr, bytes);
|
|
}
|