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Annotation of mandoc/compat_reallocarray.c, Revision 1.1

1.1     ! schwarze    1: #ifdef HAVE_CONFIG_H
        !             2: #include "config.h"
        !             3: #endif
        !             4:
        !             5: #ifdef HAVE_REALLOCARRAY
        !             6:
        !             7: int dummy;
        !             8:
        !             9: #else
        !            10:
        !            11: /*     $OpenBSD: malloc.c,v 1.158 2014/04/23 15:07:27 tedu Exp $       */
        !            12: /*
        !            13:  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
        !            14:  *
        !            15:  * Permission to use, copy, modify, and distribute this software for any
        !            16:  * purpose with or without fee is hereby granted, provided that the above
        !            17:  * copyright notice and this permission notice appear in all copies.
        !            18:  *
        !            19:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            20:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            21:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            22:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            23:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            24:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            25:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            26:  */
        !            27: #include <sys/types.h>
        !            28: #include <errno.h>
        !            29: #include <stdint.h>
        !            30: #include <stdlib.h>
        !            31:
        !            32: #define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
        !            33:
        !            34: void *
        !            35: reallocarray(void *optr, size_t nmemb, size_t size)
        !            36: {
        !            37:        if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
        !            38:            nmemb > 0 && SIZE_MAX / nmemb < size) {
        !            39:                errno = ENOMEM;
        !            40:                return NULL;
        !            41:        }
        !            42:        return realloc(optr, size * nmemb);
        !            43: }
        !            44:
        !            45: #endif /*!HAVE_REALLOCARRAY*/