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author | Gilles Chehade <gilles@poolp.org> | 2020-04-30 02:06:46 +0200 |
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committer | Gilles Chehade <gilles@poolp.org> | 2020-04-30 02:06:46 +0200 |
commit | d4180f85d53f7381da9fcc7257cf61d0b29497a0 (patch) | |
tree | 928f5541f702f22aec334cd7262d611821ff44cf /openbsd-compat/reallocarray.c | |
parent | Merge remote-tracking branch 'portable/native' (diff) | |
download | OpenSMTPD-d4180f85d53f7381da9fcc7257cf61d0b29497a0.tar.xz OpenSMTPD-d4180f85d53f7381da9fcc7257cf61d0b29497a0.zip |
merge histories
Diffstat (limited to 'openbsd-compat/reallocarray.c')
-rw-r--r-- | openbsd-compat/reallocarray.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/openbsd-compat/reallocarray.c b/openbsd-compat/reallocarray.c new file mode 100644 index 00000000..9beec719 --- /dev/null +++ b/openbsd-compat/reallocarray.c @@ -0,0 +1,42 @@ +/* $OpenBSD: reallocarray.c,v 1.1 2014/05/08 21:43:49 deraadt Exp $ */ +/* + * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* OPENBSD ORIGINAL: lib/libc/stdlib/reallocarray.c */ + +#include "includes.h" + +#include <sys/types.h> +#include <errno.h> +#include <stdint.h> +#include <stdlib.h> + +/* + * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX + * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW + */ +#define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4)) + +void * +reallocarray(void *optr, size_t nmemb, size_t size) +{ + if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && + nmemb > 0 && SIZE_MAX / nmemb < size) { + errno = ENOMEM; + return NULL; + } + return realloc(optr, size * nmemb); +} |