69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/****************************************************************************
|
|
*
|
|
* Open Watcom Project
|
|
*
|
|
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* This file contains Original Code and/or Modifications of Original
|
|
* Code as defined in and that are subject to the Sybase Open Watcom
|
|
* Public License version 1.0 (the 'License'). You may not use this file
|
|
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
|
|
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
|
|
* provided with the Original Code and Modifications, and is also
|
|
* available at www.sybase.com/developer/opensource.
|
|
*
|
|
* The Original Code and all software distributed under the License are
|
|
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
|
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
|
|
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
|
|
* NON-INFRINGEMENT. Please see the License for the specific language
|
|
* governing rights and limitations under the License.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Description: Implementation of rand() and srand().
|
|
*
|
|
****************************************************************************/
|
|
|
|
|
|
#include "variety.h"
|
|
#include <stdlib.h>
|
|
#include "randnext.h"
|
|
#include "rtdata.h"
|
|
|
|
|
|
static unsigned long *initrandnext( void )
|
|
{
|
|
_INITRANDNEXT( RETURN_ARG( unsigned long *, NULL ) );
|
|
return( (unsigned long *)&_RWD_randnext );
|
|
}
|
|
|
|
|
|
_WCRTLINK int rand( void )
|
|
/************************/
|
|
{
|
|
unsigned long *randptr;
|
|
|
|
randptr = initrandnext();
|
|
if( randptr == NULL ) {
|
|
return( 0 );
|
|
}
|
|
*randptr = *randptr * 1103515245 + 12345;
|
|
return( (int)( (*randptr >> 16) & 0x7FFF ) );
|
|
}
|
|
|
|
|
|
_WCRTLINK void srand( unsigned int seed )
|
|
/***************************************/
|
|
{
|
|
unsigned long *randptr;
|
|
|
|
randptr = initrandnext();
|
|
if( randptr != NULL ) {
|
|
*randptr = seed;
|
|
}
|
|
}
|