Return to reallocarray.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / confuse / src

Annotation of embedaddon/confuse/src/reallocarray.c, revision 1.1.1.1

1.1       misho       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: }