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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 | |||
22 | #include <ll/i386/stdlib.h> |
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23 | #include <ll/math.h> |
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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 |