1/* 2 * Copyright (c) 2022 Red Hat 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 24#ifndef REALLOCARRAY_H 25#define REALLOCARRAY_H 26 27#if !defined(HAVE_REALLOCARRAY) 28 29#include <stdlib.h> // size_t 30#include <errno.h> 31 32#ifdef __cplusplus 33extern "C" { 34#endif 35 36/* taken from the X server */ 37/* 38 * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX 39 * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW 40 */ 41#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4)) 42 43static inline void * 44reallocarray(void *optr, size_t nmemb, size_t size) 45{ 46 if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && 47 nmemb > 0 && SIZE_MAX / nmemb < size) { 48 errno = ENOMEM; 49 return NULL; 50 } 51 return realloc(optr, size * nmemb); 52} 53 54#ifdef __cplusplus 55} 56#endif 57 58#endif /* !defined(HAVE_REALLOCARRAY) */ 59 60#endif /* REALLOCARRAY_H */ 61