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Annotation of mandoc/compat_reallocarray.c, Revision 1.3

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:
                      9: /*     $OpenBSD: malloc.c,v 1.158 2014/04/23 15:07:27 tedu Exp $       */
                     10: /*
                     11:  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
                     12:  *
                     13:  * Permission to use, copy, modify, and distribute this software for any
                     14:  * purpose with or without fee is hereby granted, provided that the above
                     15:  * copyright notice and this permission notice appear in all copies.
                     16:  *
                     17:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     18:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     19:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     20:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     21:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     22:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     23:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     24:  */
                     25: #include <sys/types.h>
                     26: #include <errno.h>
                     27: #include <stdint.h>
                     28: #include <stdlib.h>
                     29:
                     30: #define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
                     31:
                     32: void *
                     33: reallocarray(void *optr, size_t nmemb, size_t size)
                     34: {
                     35:        if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
                     36:            nmemb > 0 && SIZE_MAX / nmemb < size) {
                     37:                errno = ENOMEM;
                     38:                return NULL;
                     39:        }
                     40:        return realloc(optr, size * nmemb);
                     41: }
                     42:
                     43: #endif /*!HAVE_REALLOCARRAY*/

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