diff options
Diffstat (limited to 'lib/isc/safe.c')
-rw-r--r-- | lib/isc/safe.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/isc/safe.c b/lib/isc/safe.c new file mode 100644 index 0000000000000..fd27687188722 --- /dev/null +++ b/lib/isc/safe.c @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC") + * + * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC 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. + */ + +/* $Id$ */ + +/*! \file */ + +#include <config.h> + +#include <isc/safe.h> +#include <isc/util.h> + +#ifdef _MSC_VER +#pragma optimize("", off) +#endif + +isc_boolean_t +isc_safe_memcmp(const void *s1, const void *s2, size_t n) { + isc_uint8_t acc = 0; + + if (n != 0U) { + const isc_uint8_t *p1 = s1, *p2 = s2; + + do { + acc |= *p1++ ^ *p2++; + } while (--n != 0U); + } + return (ISC_TF(acc == 0)); +} |