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/* $NetBSD: reallocarr.c,v 1.5 2015/08/20 22:27:49 kamil Exp $ */ /*- * Copyright (c) 2015 Joerg Sonnenberger <[email protected]>. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if !HAVE_REALLOCARR #include "config.h" #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif __RCSID("$NetBSD: reallocarr.c,v 1.5 2015/08/20 22:27:49 kamil Exp $"); #include <errno.h> /* Old POSIX has SIZE_MAX in limits.h */ #include <limits.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #ifdef _LIBC #ifdef __weak_alias __weak_alias(reallocarr, _reallocarr) #endif #endif #define SQRT_SIZE_MAX (((size_t)1) << (sizeof(size_t) * CHAR_BIT / 2)) int reallocarr(void *ptr, size_t number, size_t size) { int saved_errno, result; void *optr; void *nptr; saved_errno = errno; memcpy(&optr, ptr, sizeof(ptr)); if (number == 0 || size == 0) { free(optr); nptr = NULL; memcpy(ptr, &nptr, sizeof(ptr)); errno = saved_errno; return 0; } /* * Try to avoid division here. * * It isn't possible to overflow during multiplication if neither * operand uses any of the most significant half of the bits. */ if ((number|size) >= SQRT_SIZE_MAX && number > SIZE_MAX / size) { errno = saved_errno; return EOVERFLOW; } nptr = realloc(optr, number * size); if (nptr == NULL) { result = errno; } else { result = 0; memcpy(ptr, &nptr, sizeof(ptr)); } errno = saved_errno; return result; } #endif