mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-20 08:30:00 +00:00
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.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
|
|
/* Global state for non-reentrant functions. */
|
|
struct drand48_data __libc_drand48_data;
|
|
|
|
|
|
int
|
|
__drand48_iterate (xsubi, buffer)
|
|
unsigned short int xsubi[3];
|
|
struct drand48_data *buffer;
|
|
{
|
|
uint64_t X;
|
|
uint64_t result;
|
|
|
|
/* Initialize buffer, if not yet done. */
|
|
if (__builtin_expect (!buffer->__init, 0))
|
|
{
|
|
buffer->__a = 0x5deece66dull;
|
|
buffer->__c = 0xb;
|
|
buffer->__init = 1;
|
|
}
|
|
|
|
/* Do the real work. We choose a data type which contains at least
|
|
48 bits. Because we compute the modulus it does not care how
|
|
many bits really are computed. */
|
|
|
|
X = (uint64_t) xsubi[2] << 32 | (uint32_t) xsubi[1] << 16 | xsubi[0];
|
|
|
|
result = X * buffer->__a + buffer->__c;
|
|
|
|
xsubi[0] = result & 0xffff;
|
|
xsubi[1] = (result >> 16) & 0xffff;
|
|
xsubi[2] = (result >> 32) & 0xffff;
|
|
|
|
return 0;
|
|
}
|