From eb14d0cc649978c10928bf38c1847f295bf0de69 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Tue, 4 Apr 2017 12:06:57 +0200 Subject: Add BSD-specific reallocarray() It is available in FreeBSD, NetBSD and OpenBSD, but not in glibc. It is used for example by OpenSSH. --- newlib/libc/stdlib/reallocarray.c | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 newlib/libc/stdlib/reallocarray.c (limited to 'newlib/libc/stdlib/reallocarray.c') diff --git a/newlib/libc/stdlib/reallocarray.c b/newlib/libc/stdlib/reallocarray.c new file mode 100644 index 000000000..4b6cccb70 --- /dev/null +++ b/newlib/libc/stdlib/reallocarray.c @@ -0,0 +1,42 @@ +/* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */ +/* + * Copyright (c) 2008 Otto Moerbeek + * + * 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. + */ + +#include +__FBSDID("$FreeBSD: head/lib/libc/stdlib/reallocarray.c 282314 2015-05-01 18:32:16Z bapt $"); + +#include +#include +#include +#include + +/* + * 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 ((size_t)1 << (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)); +} -- cgit v1.2.3