projects / unix-history / blame
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1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. | |
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3 | * All rights reserved. |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms are permitted | |
| 6 | * provided that this notice is preserved and that due credit is given | |
| 7 | * to the University of California at Berkeley. The name of the University | |
| 8 | * may not be used to endorse or promote products derived from this | |
| 9 | * software without specific prior written permission. This software | |
| 10 | * is provided ``as is'' without express or implied warranty. | |
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11 | */ |
| 12 | ||
| 13 | #ifndef lint | |
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14 | static char sccsid[] = "@(#)rnd_pos.c 5.2 (Berkeley) %G%"; |
| 15 | #endif /* not lint */ | |
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16 | |
| 17 | # include "robots.h" | |
| 18 | ||
| 19 | # define IS_SAME(p,y,x) ((p).y != -1 && (p).y == y && (p).x == x) | |
| 20 | ||
| 21 | /* | |
| 22 | * rnd_pos: | |
| 23 | * Pick a random, unoccupied position | |
| 24 | */ | |
| 25 | COORD * | |
| 26 | rnd_pos() | |
| 27 | { | |
| 28 | static COORD pos; | |
| 29 | static int call = 0; | |
| 30 | register int i = 0; | |
| 31 | ||
| 32 | do { | |
| 33 | pos.y = rnd(Y_FIELDSIZE - 1) + 1; | |
| 34 | pos.x = rnd(X_FIELDSIZE - 1) + 1; | |
| 35 | refresh(); | |
| 36 | } while (Field[pos.y][pos.x] != 0); | |
| 37 | call++; | |
| 38 | return &pos; | |
| 39 | } | |
| 40 | ||
| 41 | rnd(range) | |
| 42 | int range; | |
| 43 | { | |
| 44 | unsigned int rand(); | |
| 45 | ||
| 46 | return rand() % range; | |
| 47 | } |