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  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.
  24. *
  25. *  ========================================================================
  26. *
  27. * Description:  Implementation of rand() and srand().
  28. *
  29. ****************************************************************************/
  30.  
  31.  
  32. #include "variety.h"
  33. #include <stdlib.h>
  34. #include "randnext.h"
  35. #include "rtdata.h"
  36.  
  37.  
  38. static unsigned long *initrandnext( void )
  39. {
  40.     _INITRANDNEXT( RETURN_ARG( unsigned long *, NULL ) );
  41.     return( (unsigned long *)&_RWD_randnext );
  42. }
  43.  
  44.  
  45. _WCRTLINK int rand( void )
  46. /************************/
  47. {
  48.     unsigned long   *randptr;
  49.  
  50.     randptr = initrandnext();
  51.     if( randptr == NULL ) {
  52.         return( 0 );
  53.     }
  54.     *randptr = *randptr * 1103515245 + 12345;
  55.     return( (int)( (*randptr >> 16) & 0x7FFF ) );
  56. }
  57.  
  58.  
  59. _WCRTLINK void srand( unsigned int seed )
  60. /***************************************/
  61. {
  62.     unsigned long   *randptr;
  63.  
  64.     randptr = initrandnext();
  65.     if( randptr != NULL ) {
  66.         *randptr = seed;
  67.     }
  68. }
  69.