lib/libc/stdlib/seed48.c

   1 /*      $NetBSD: seed48.c,v 1.8 2005/06/12 05:21:28 lukem Exp $ */
   2
   3 /*
   4  * Copyright (c) 1993 Martin Birgmeier
   5  * All rights reserved.
   6  *
   7  * You may redistribute unmodified or modified versions of this source
   8  * code provided that the above copyright notice and this and the
   9  * following conditions are retained.
  10  *
  11  * This software is provided ``as is'', and comes with no warranties
  12  * of any kind. I shall in no event be liable for anything that happens
  13  * to anyone/anything when using this software.
  14  */
  15
  16 #include <sys/cdefs.h>
  17 #if defined(LIBC_SCCS) && !defined(lint)
  18 __RCSID("$NetBSD: seed48.c,v 1.8 2005/06/12 05:21:28 lukem Exp $");
  19 #endif /* LIBC_SCCS and not lint */
  20
  21 #include "namespace.h"
  22
  23 #include <assert.h>
  24
  25 #include "rand48.h"
  26
  27 #ifdef __weak_alias
  28 __weak_alias(seed48,_seed48)
  29 #endif
  30
  31 unsigned short *
  32 seed48(unsigned short xseed[3])
  33 {
  34         static unsigned short sseed[3];
  35
  36         _DIAGASSERT(xseed != NULL);
  37
  38         sseed[0] = __rand48_seed[0];
  39         sseed[1] = __rand48_seed[1];
  40         sseed[2] = __rand48_seed[2];
  41         __rand48_seed[0] = xseed[0];
  42         __rand48_seed[1] = xseed[1];
  43         __rand48_seed[2] = xseed[2];
  44         __rand48_mult[0] = RAND48_MULT_0;
  45         __rand48_mult[1] = RAND48_MULT_1;
  46         __rand48_mult[2] = RAND48_MULT_2;
  47         __rand48_add = RAND48_ADD;
  48         return sseed;
  49 }