From 4eb5089821b014d84fac2ef432da0f7bbaba754e Mon Sep 17 00:00:00 2001 From: Uwe Hermann Date: Mon, 7 Apr 2008 23:33:50 +0000 Subject: Add rand/rand_r/srand functions for generating pseudo-random bytes. Signed-off-by: Uwe Hermann Acked-by: Jordan Crouse git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3222 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- payloads/libpayload/libc/rand.c | 52 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 payloads/libpayload/libc/rand.c (limited to 'payloads/libpayload/libc/rand.c') diff --git a/payloads/libpayload/libc/rand.c b/payloads/libpayload/libc/rand.c new file mode 100644 index 0000000000..d490809119 --- /dev/null +++ b/payloads/libpayload/libc/rand.c @@ -0,0 +1,52 @@ +/* + * This file is part of the libpayload project. + * + * It was originally taken from the OpenBSD project. + * + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include + +static unsigned int next = 1; + +int rand_r(unsigned int *seed) +{ + *seed = *seed * 1103515245 + 12345; + return (*seed % ((unsigned int)RAND_MAX + 1)); +} + +int rand(void) +{ + return (rand_r(&next)); +} + +void srand(unsigned int seed) +{ + next = seed; +} -- cgit v1.2.3