projects / unix-history / blame
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|---|---|---|
| 99cf7158 KM |
1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | */ | |
| 6 | ||
| 7 | #ifndef lint | |
| 6b087f63 | 8 | static char sccsid[] = "@(#)twinkle1.c 5.1 (Berkeley) %G%"; |
| 99cf7158 KM |
9 | #endif not lint |
| 10 | ||
| 11 | # include <curses.h> | |
| 12 | # include <signal.h> | |
| 13 | ||
| 14 | /* | |
| 15 | * the idea for this program was a product of the imagination of | |
| 16 | * Kurt Schoens. Not responsible for minds lost or stolen. | |
| 17 | */ | |
| 18 | ||
| 19 | # define NCOLS 80 | |
| 20 | # define NLINES 24 | |
| 21 | # define MAXPATTERNS 4 | |
| 22 | ||
| 23 | struct locs { | |
| 24 | char y, x; | |
| 25 | }; | |
| 26 | ||
| 27 | typedef struct locs LOCS; | |
| 28 | ||
| 29 | LOCS Layout[NCOLS * NLINES]; /* current board layout */ | |
| 30 | ||
| 31 | int Pattern, /* current pattern number */ | |
| 32 | Numstars; /* number of stars in pattern */ | |
| 33 | ||
| 34 | main() { | |
| 35 | ||
| 36 | char *getenv(); | |
| 37 | int die(); | |
| 38 | ||
| 39 | srand(getpid()); /* initialize random sequence */ | |
| 40 | ||
| 41 | initscr(); | |
| 42 | signal(SIGINT, die); | |
| 43 | noecho(); | |
| 44 | nonl(); | |
| 45 | leaveok(stdscr, TRUE); | |
| 46 | scrollok(stdscr, FALSE); | |
| 47 | ||
| 48 | for (;;) { | |
| 49 | makeboard(); /* make the board setup */ | |
| 50 | puton('*'); /* put on '*'s */ | |
| 51 | puton(' '); /* cover up with ' 's */ | |
| 52 | } | |
| 53 | } | |
| 54 | ||
| 55 | /* | |
| 56 | * On program exit, move the cursor to the lower left corner by | |
| 57 | * direct addressing, since current location is not guaranteed. | |
| 58 | * We lie and say we used to be at the upper right corner to guarantee | |
| 59 | * absolute addressing. | |
| 60 | */ | |
| 61 | die() { | |
| 62 | ||
| 63 | signal(SIGINT, SIG_IGN); | |
| 64 | mvcur(0, COLS-1, LINES-1, 0); | |
| 65 | endwin(); | |
| 66 | exit(0); | |
| 67 | } | |
| 68 | ||
| 69 | ||
| 70 | /* | |
| 71 | * Make the current board setup. It picks a random pattern and | |
| 72 | * calls ison() to determine if the character is on that pattern | |
| 73 | * or not. | |
| 74 | */ | |
| 75 | makeboard() { | |
| 76 | ||
| 77 | reg int y, x; | |
| 78 | reg LOCS *lp; | |
| 79 | ||
| 80 | Pattern = rand() % MAXPATTERNS; | |
| 81 | lp = Layout; | |
| 82 | for (y = 0; y < NLINES; y++) | |
| 83 | for (x = 0; x < NCOLS; x++) | |
| 84 | if (ison(y, x)) { | |
| 85 | lp->y = y; | |
| 86 | lp++->x = x; | |
| 87 | } | |
| 88 | Numstars = lp - Layout; | |
| 89 | } | |
| 90 | ||
| 91 | /* | |
| 92 | * Return TRUE if (y, x) is on the current pattern. | |
| 93 | */ | |
| 94 | ison(y, x) | |
| 95 | reg int y, x; { | |
| 96 | ||
| 97 | switch (Pattern) { | |
| 98 | case 0: /* alternating lines */ | |
| 99 | return !(y & 01); | |
| 100 | case 1: /* box */ | |
| 101 | if (x >= LINES && y >= NCOLS) | |
| 102 | return FALSE; | |
| 103 | if (y < 3 || y >= NLINES - 3) | |
| 104 | return TRUE; | |
| 105 | return (x < 3 || x >= NCOLS - 3); | |
| 106 | case 2: /* holy pattern! */ | |
| 107 | return ((x + y) & 01); | |
| 108 | case 3: /* bar across center */ | |
| 109 | return (y >= 9 && y <= 15); | |
| 110 | } | |
| 111 | /* NOTREACHED */ | |
| 112 | } | |
| 113 | ||
| 114 | puton(ch) | |
| 115 | reg char ch; { | |
| 116 | ||
| 117 | reg LOCS *lp; | |
| 118 | reg int r; | |
| 119 | reg LOCS *end; | |
| 120 | LOCS temp; | |
| 121 | ||
| 122 | end = &Layout[Numstars]; | |
| 123 | for (lp = Layout; lp < end; lp++) { | |
| 124 | r = rand() % Numstars; | |
| 125 | temp = *lp; | |
| 126 | *lp = Layout[r]; | |
| 127 | Layout[r] = temp; | |
| 128 | } | |
| 129 | ||
| 130 | for (lp = Layout; lp < end; lp++) { | |
| 131 | mvaddch(lp->y, lp->x, ch); | |
| 132 | refresh(); | |
| 133 | } | |
| 134 | } |