Return to reallocarray.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / tmux / compat

Annotation of embedaddon/tmux/compat/reallocarray.c, revision 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: }