uclibc-ng/libc/stdlib/nrand48_r.c

/* Copyright (C) 1995, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu <mailto: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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <stdlib.h>

extern int __drand48_iterate(unsigned short xsubi[3], 
	struct drand48_data *buffer);

int nrand48_r (xsubi, buffer, result)
     unsigned short int xsubi[3];
     struct drand48_data *buffer;
     long int *result;
{
    /* Compute next state.  */
    if (__drand48_iterate (xsubi, buffer) < 0)
	return -1;

    /* Store the result.  */
    if (sizeof (unsigned short int) == 2)
	*result = xsubi[2] << 15 | xsubi[1] >> 1;
    else
	*result = xsubi[2] >> 1;

    return 0;
}