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d17c01f9fe
* stdlib/stdlib.h (drand48_data): Make available only for __USE_MISC. Rename elements to protect namespace. Change type and position of a and init element. * stdlib/drand48-iter.c: Don't handle unsigned short > 16 bit differently. Adjust for drand48_data change. Don't compute a here, it comes from drand48_data. * stdlib/lcong48_r.c: Don't handle unsigned short > 16 bit differently. Adjust for drand48_data change. Compute a here. * stdlib/srand48_r.c: Likewise. * stdlib/drand48.c: Adjust for drand48_data change. * stdlib/lrand48.c: Likewise. * stdlib/mrand48.c: Likewise. * stdlib/seek48.c: Likewise. * stdlib/drand48_r.c: Likewise. * stdlib/lrand48_r.c: Likewise. * stdlib/mrand48_r.c: Likewise. * stdlib/seed48_r.c: Likewise. Don't handle unsigned short > 16 bit differently. * stdlib/erand48_r.c: Don't handle unsigned short > 16 bit differently. * stdlib/jrand48_r.c: Likewise.
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* Copyright (C) 1995, 1996, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <stdint.h>
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#include <sys/types.h>
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/* Global state for non-reentrant functions. */
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struct drand48_data __libc_drand48_data;
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int
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__drand48_iterate (xsubi, buffer)
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unsigned short int xsubi[3];
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struct drand48_data *buffer;
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{
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uint64_t X;
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uint64_t result;
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/* Initialize buffer, if not yet done. */
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if (__builtin_expect (!buffer->__init, 0))
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{
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buffer->__a = 0x5deece66dull;
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buffer->__c = 0xb;
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buffer->__init = 1;
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}
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/* Do the real work. We choose a data type which contains at least
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48 bits. Because we compute the modulus it does not care how
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many bits really are computed. */
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X = (uint64_t) xsubi[2] << 32 | (uint32_t) xsubi[1] << 16 | xsubi[0];
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result = X * buffer->__a + buffer->__c;
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xsubi[0] = result & 0xffff;
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xsubi[1] = (result >> 16) & 0xffff;
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xsubi[2] = (result >> 32) & 0xffff;
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return 0;
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}
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