diff options
author | Uwe Hermann <uwe@hermann-uwe.de> | 2008-04-07 23:33:50 +0000 |
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committer | Uwe Hermann <uwe@hermann-uwe.de> | 2008-04-07 23:33:50 +0000 |
commit | 4eb5089821b014d84fac2ef432da0f7bbaba754e (patch) | |
tree | 2bc6f29c9ee05044f3d75f8c890965ffed89053c /payloads/libpayload/libc/rand.c | |
parent | c6092c0f34cde338dcce2cd61cdee8826b4c1a59 (diff) | |
download | coreboot-4eb5089821b014d84fac2ef432da0f7bbaba754e.tar.xz |
Add rand/rand_r/srand functions for generating pseudo-random bytes.
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3222 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'payloads/libpayload/libc/rand.c')
-rw-r--r-- | payloads/libpayload/libc/rand.c | 52 |
1 files changed, 52 insertions, 0 deletions
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 <libpayload.h> + +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; +} |