From 3fc228fb4c1a39aceaee3d7013365042a6077bd0 Mon Sep 17 00:00:00 2001 From: cvs2svn Date: Fri, 26 Mar 1999 18:24:03 +0000 Subject: This commit was manufactured by cvs2git to create branch 'OPENBSD_2_5'. --- src/lib/libc/stdlib/_rand48.c | 50 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 src/lib/libc/stdlib/_rand48.c (limited to 'src/lib/libc/stdlib/_rand48.c') diff --git a/src/lib/libc/stdlib/_rand48.c b/src/lib/libc/stdlib/_rand48.c new file mode 100644 index 0000000000..fed7372f68 --- /dev/null +++ b/src/lib/libc/stdlib/_rand48.c @@ -0,0 +1,50 @@ +/* + * Copyright (c) 1993 Martin Birgmeier + * All rights reserved. + * + * You may redistribute unmodified or modified versions of this source + * code provided that the above copyright notice and this and the + * following conditions are retained. + * + * This software is provided ``as is'', and comes with no warranties + * of any kind. I shall in no event be liable for anything that happens + * to anyone/anything when using this software. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char rcsid[] = "$OpenBSD: _rand48.c,v 1.2 1996/08/19 08:33:19 tholo Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include "rand48.h" + +unsigned short __rand48_seed[3] = { + RAND48_SEED_0, + RAND48_SEED_1, + RAND48_SEED_2 +}; +unsigned short __rand48_mult[3] = { + RAND48_MULT_0, + RAND48_MULT_1, + RAND48_MULT_2 +}; +unsigned short __rand48_add = RAND48_ADD; + +void +__dorand48(unsigned short xseed[3]) +{ + unsigned long accu; + unsigned short temp[2]; + + accu = (unsigned long) __rand48_mult[0] * (unsigned long) xseed[0] + + (unsigned long) __rand48_add; + temp[0] = (unsigned short) accu; /* lower 16 bits */ + accu >>= sizeof(unsigned short) * 8; + accu += (unsigned long) __rand48_mult[0] * (unsigned long) xseed[1] + + (unsigned long) __rand48_mult[1] * (unsigned long) xseed[0]; + temp[1] = (unsigned short) accu; /* middle 16 bits */ + accu >>= sizeof(unsigned short) * 8; + accu += __rand48_mult[0] * xseed[2] + __rand48_mult[1] * xseed[1] + __rand48_mult[2] * xseed[0]; + xseed[0] = temp[0]; + xseed[1] = temp[1]; + xseed[2] = (unsigned short) accu; +} -- cgit v1.2.3-55-g6feb