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Annotation of embedaddon/tmux/compat/reallocarray.c, revision 1.1.1.1

1.1       misho       1: /*     $OpenBSD: reallocarray.c,v 1.3 2015/09/13 08:31:47 guenther 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: #include "compat.h"
                     24: 
                     25: /*
                     26:  * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
                     27:  * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
                     28:  */
                     29: #define MUL_NO_OVERFLOW        ((size_t)1 << (sizeof(size_t) * 4))
                     30: 
                     31: void *
                     32: reallocarray(void *optr, size_t nmemb, size_t size)
                     33: {
                     34:        if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
                     35:            nmemb > 0 && SIZE_MAX / nmemb < size) {
                     36:                errno = ENOMEM;
                     37:                return NULL;
                     38:        }
                     39:        return realloc(optr, size * nmemb);
                     40: }