ireallocarray.c - stagit-gopher - A git gopher frontend. (mirror)	Err	bitreich.org	70
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i---	Err	bitreich.org	70
ireallocarray.c (1306B)	Err	bitreich.org	70
i---	Err	bitreich.org	70
i     1 /*	Err	bitreich.org	70
i     2  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>	Err	bitreich.org	70
i     3  *	Err	bitreich.org	70
i     4  * Permission to use, copy, modify, and distribute this software for any	Err	bitreich.org	70
i     5  * purpose with or without fee is hereby granted, provided that the above	Err	bitreich.org	70
i     6  * copyright notice and this permission notice appear in all copies.	Err	bitreich.org	70
i     7  *	Err	bitreich.org	70
i     8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES	Err	bitreich.org	70
i     9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF	Err	bitreich.org	70
i    10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR	Err	bitreich.org	70
i    11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES	Err	bitreich.org	70
i    12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN	Err	bitreich.org	70
i    13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF	Err	bitreich.org	70
i    14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.	Err	bitreich.org	70
i    15  */	Err	bitreich.org	70
i    16 	Err	bitreich.org	70
i    17 #include <sys/types.h>	Err	bitreich.org	70
i    18 #include <errno.h>	Err	bitreich.org	70
i    19 #include <stdint.h>	Err	bitreich.org	70
i    20 #include <stdlib.h>	Err	bitreich.org	70
i    21 	Err	bitreich.org	70
i    22 #include "compat.h"	Err	bitreich.org	70
i    23 	Err	bitreich.org	70
i    24 /*	Err	bitreich.org	70
i    25  * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX	Err	bitreich.org	70
i    26  * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW	Err	bitreich.org	70
i    27  */	Err	bitreich.org	70
i    28 #define MUL_NO_OVERFLOW        (1UL << (sizeof(size_t) * 4))	Err	bitreich.org	70
i    29 	Err	bitreich.org	70
i    30 void *	Err	bitreich.org	70
i    31 reallocarray(void *optr, size_t nmemb, size_t size)	Err	bitreich.org	70
i    32 {	Err	bitreich.org	70
i    33         if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&	Err	bitreich.org	70
i    34             nmemb > 0 && SIZE_MAX / nmemb < size) {	Err	bitreich.org	70
i    35                 errno = ENOMEM;	Err	bitreich.org	70
i    36                 return NULL;	Err	bitreich.org	70
i    37         }	Err	bitreich.org	70
i    38         return realloc(optr, size * nmemb);	Err	bitreich.org	70
i    39 }	Err	bitreich.org	70
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