1 /*
2  * Copyright (c) 1980 The Regents of the University of California.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms are permitted
6  * provided that the above copyright notice and this paragraph are
7  * duplicated in all such forms and that any documentation,
8  * advertising materials, and other materials related to such
9  * distribution and use acknowledge that the software was developed
10  * by the University of California, Berkeley.  The name of the
11  * University may not be used to endorse or promote products derived
12  * from this software without specific prior written permission.
13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16  */
17 
18 #ifndef lint
19 char copyright[] =
20 "@(#) Copyright (c) 1980 The Regents of the University of California.\n\
21  All rights reserved.\n";
22 #endif /* not lint */
23 
24 #ifndef lint
25 static char sccsid[] = "@(#)twinkle2.c	6.2 (Berkeley) 03/17/89";
26 #endif /* not lint */
27 
28 extern int	_putchar();
29 
30 main()
31 {
32 	reg char	*sp;
33 
34 	srand(getpid());		/* initialize random sequence */
35 
36 	if (isatty(0)) {
37 	       gettmode();
38 	       if ((sp = getenv("TERM")) != NULL)
39 		       setterm(sp);
40 		signal(SIGINT, die);
41 	}
42 	else {
43 		printf("Need a terminal on %d\n", _tty_ch);
44 		exit(1);
45 	}
46 	_puts(TI);
47 	_puts(VS);
48 
49 	noecho();
50 	nonl();
51 	tputs(CL, NLINES, _putchar);
52 	for (;;) {
53 		makeboard();		/* make the board setup */
54 		puton('*');		/* put on '*'s */
55 		puton(' ');		/* cover up with ' 's */
56 	}
57 }
58 
59 puton(ch)
60 char	ch;
61 {
62 	reg LOCS	*lp;
63 	reg int		r;
64 	reg LOCS	*end;
65 	LOCS		temp;
66 	static int	lasty, lastx;
67 
68 	end = &Layout[Numstars];
69 	for (lp = Layout; lp < end; lp++) {
70 		r = rand() % Numstars;
71 		temp = *lp;
72 		*lp = Layout[r];
73 		Layout[r] = temp;
74 	}
75 
76 	for (lp = Layout; lp < end; lp++)
77 			/* prevent scrolling */
78 		if (!AM || (lp->y < NLINES - 1 || lp->x < NCOLS - 1)) {
79 			mvcur(lasty, lastx, lp->y, lp->x);
80 			putchar(ch);
81 			lasty = lp->y;
82 			if ((lastx = lp->x + 1) >= NCOLS)
83 				if (AM) {
84 					lastx = 0;
85 					lasty++;
86 				}
87 				else
88 					lastx = NCOLS - 1;
89 		}
90 }
91