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Annotation of mandoc/compat_reallocarray.c, Revision 1.4

1.1       schwarze    1: #include "config.h"
                      2:
1.3       schwarze    3: #if HAVE_REALLOCARRAY
1.1       schwarze    4:
                      5: int dummy;
                      6:
                      7: #else
                      8:
1.4     ! schwarze    9: /*     $Id$    */
        !            10: /*     $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $  */
1.1       schwarze   11: /*
                     12:  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
                     13:  *
                     14:  * Permission to use, copy, modify, and distribute this software for any
                     15:  * purpose with or without fee is hereby granted, provided that the above
                     16:  * copyright notice and this permission notice appear in all copies.
                     17:  *
                     18:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     19:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     20:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     21:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     22:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     23:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     24:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     25:  */
1.4     ! schwarze   26:
1.1       schwarze   27: #include <sys/types.h>
                     28: #include <errno.h>
                     29: #include <stdint.h>
                     30: #include <stdlib.h>
                     31:
1.4     ! schwarze   32: /*
        !            33:  * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
        !            34:  * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
        !            35:  */
        !            36: #define MUL_NO_OVERFLOW        ((size_t)1 << (sizeof(size_t) * 4))
1.1       schwarze   37:
                     38: void *
                     39: reallocarray(void *optr, size_t nmemb, size_t size)
                     40: {
                     41:        if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
                     42:            nmemb > 0 && SIZE_MAX / nmemb < size) {
                     43:                errno = ENOMEM;
                     44:                return NULL;
                     45:        }
                     46:        return realloc(optr, size * nmemb);
                     47: }
                     48:
                     49: #endif /*!HAVE_REALLOCARRAY*/

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