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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* Project: OSLib |
| 2 | * Description: The OS Construction Kit |
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| 3 | * Date: 1.6.2000 |
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| 4 | * Idea by: Luca Abeni & Gerardo Lamastra |
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| 5 | * |
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| 6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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| 7 | * low-level infrastructure for developing OS kernels and Embedded |
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| 8 | * Applications; it partially derives from the HARTIK project but it |
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| 9 | * currently is independently developed. |
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| 10 | * |
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| 11 | * OSLib is distributed under GPL License, and some of its code has |
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| 12 | * been derived from the Linux kernel source; also some important |
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| 13 | * ideas come from studying the DJGPP go32 extender. |
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| 14 | * |
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| 15 | * We acknowledge the Linux Community, Free Software Foundation, |
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| 16 | * D.J. Delorie and all the other developers who believe in the |
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| 17 | * freedom of software and ideas. |
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| 18 | * |
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| 19 | * For legalese, check out the included GPL license. |
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| 20 | */ |
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| 21 | |||
| 1621 | fabio | 22 | #include <arch/i386/stdlib.h> |
| 23 | #include <arch/math.h> |
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| 2 | pj | 24 | |
| 25 | FILE(random); |
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| 26 | |||
| 27 | #define MODULUS 2147483647L |
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| 28 | #define FACTOR 16807L |
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| 29 | #define DIVISOR 127773L |
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| 30 | #define REMAINDER 2836L |
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| 31 | static long int last_val; |
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| 32 | |||
| 33 | long int rand(void) |
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| 34 | { |
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| 35 | long int last_div = last_val / DIVISOR; |
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| 36 | long int last_rem = last_val % DIVISOR; |
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| 37 | last_val = (FACTOR * last_rem) - (REMAINDER * last_div); |
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| 38 | if (last_val < 0) last_val += MODULUS; |
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| 39 | return(last_val); |
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| 40 | } |
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| 41 | |||
| 42 | void srand(long int seed) |
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| 43 | { |
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| 44 | last_val = seed; |
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| 45 | } |
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| 46 |