newlib/libc/stdlib/reallocarray.c

   1 /*      $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $  */
   2 /*
   3  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <sys/cdefs.h>
  19 #include <sys/types.h>
  20 #include <errno.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23
  24 void *
  25 reallocarray(void *optr, size_t nmemb, size_t size)
  26 {
  27         ptrdiff_t bytes;
  28
  29         if (__builtin_mul_overflow (nmemb, size, &bytes))
  30         {
  31                 errno = ENOMEM;
  32                 return NULL;
  33         }
  34         return realloc(optr, bytes);
  35 }