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*/
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