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confuse 3.3

    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/types.h>
   19: #include <errno.h>
   20: #include <stdint.h>
   21: #include <stdlib.h>
   22: 
   23: /*
   24:  * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
   25:  * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
   26:  */
   27: #define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
   28: 
   29: void *
   30: reallocarray(void *optr, size_t nmemb, size_t size)
   31: {
   32: 	if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
   33: 	    nmemb > 0 && SIZE_MAX / nmemb < size) {
   34: 		errno = ENOMEM;
   35: 		return NULL;
   36: 	}
   37: 	return realloc(optr, size * nmemb);
   38: }