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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 554 | serge | 1 | /**************************************************************************** |
| 2 | * |
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| 3 | * Open Watcom Project |
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| 4 | * |
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| 5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
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| 6 | * |
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| 7 | * ======================================================================== |
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| 8 | * |
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| 9 | * This file contains Original Code and/or Modifications of Original |
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| 10 | * Code as defined in and that are subject to the Sybase Open Watcom |
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| 11 | * Public License version 1.0 (the 'License'). You may not use this file |
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| 12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
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| 13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
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| 14 | * provided with the Original Code and Modifications, and is also |
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| 15 | * available at www.sybase.com/developer/opensource. |
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| 16 | * |
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| 17 | * The Original Code and all software distributed under the License are |
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| 18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
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| 19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
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| 20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
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| 21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
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| 22 | * NON-INFRINGEMENT. Please see the License for the specific language |
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| 23 | * governing rights and limitations under the License. |
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| 24 | * |
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| 25 | * ======================================================================== |
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| 26 | * |
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| 27 | * Description: Implementation of rand() and srand(). |
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| 28 | * |
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| 29 | ****************************************************************************/ |
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| 30 | |||
| 31 | |||
| 32 | #include "variety.h" |
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| 33 | #include |
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| 34 | #include "randnext.h" |
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| 35 | #include "rtdata.h" |
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| 36 | |||
| 37 | |||
| 38 | static unsigned long *initrandnext( void ) |
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| 39 | { |
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| 40 | _INITRANDNEXT( RETURN_ARG( unsigned long *, NULL ) ); |
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| 41 | return( (unsigned long *)&_RWD_randnext ); |
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| 42 | } |
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| 43 | |||
| 44 | |||
| 45 | _WCRTLINK int rand( void ) |
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| 46 | /************************/ |
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| 47 | { |
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| 48 | unsigned long *randptr; |
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| 49 | |||
| 50 | randptr = initrandnext(); |
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| 51 | if( randptr == NULL ) { |
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| 52 | return( 0 ); |
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| 53 | } |
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| 54 | *randptr = *randptr * 1103515245 + 12345; |
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| 55 | return( (int)( (*randptr >> 16) & 0x7FFF ) ); |
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| 56 | } |
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| 57 | |||
| 58 | |||
| 59 | _WCRTLINK void srand( unsigned int seed ) |
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| 60 | /***************************************/ |
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| 61 | { |
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| 62 | unsigned long *randptr; |
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| 63 | |||
| 64 | randptr = initrandnext(); |
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| 65 | if( randptr != NULL ) { |
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| 66 | *randptr = seed; |
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| 67 | } |
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| 68 | } |