[444] | 1 | /* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */ |
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| 2 | /* |
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| 3 | * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> |
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| 4 | * |
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| 5 | * Permission to use, copy, modify, and distribute this software for any |
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| 6 | * purpose with or without fee is hereby granted, provided that the above |
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| 7 | * copyright notice and this permission notice appear in all copies. |
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| 8 | * |
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| 9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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| 10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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| 12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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| 15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 16 | */ |
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| 17 | |
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| 18 | #include <sys/cdefs.h> |
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| 19 | __FBSDID("$FreeBSD: head/lib/libc/stdlib/reallocarray.c 282314 2015-05-01 18:32:16Z bapt $"); |
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| 20 | |
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| 21 | #include <sys/types.h> |
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| 22 | #include <errno.h> |
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| 23 | #include <stdint.h> |
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| 24 | #include <stdlib.h> |
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| 25 | |
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| 26 | /* |
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| 27 | * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX |
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| 28 | * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW |
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| 29 | */ |
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| 30 | #define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4)) |
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| 31 | |
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| 32 | void * |
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| 33 | reallocarray(void *optr, size_t nmemb, size_t size) |
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| 34 | { |
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| 35 | |
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| 36 | if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && |
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| 37 | nmemb > 0 && SIZE_MAX / nmemb < size) { |
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| 38 | errno = ENOMEM; |
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| 39 | return (NULL); |
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| 40 | } |
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| 41 | return (realloc(optr, size * nmemb)); |
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| 42 | } |
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