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Member "reptyr-reptyr-0.8.0/reallocarray.c" (29 Sep 2020, 1417 Bytes) of package /linux/privat/reptyr-reptyr-0.8.0.tar.gz:


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    1 /*  $OpenBSD: reallocarray.c,v 1.1 2014/05/08 21:43:49 deraadt 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 "reallocarray.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 (1UL << (sizeof(size_t) * 4))
   30 
   31 void *
   32 xreallocarray(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 }
   41