dots.c

ncurses-5.4

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/*
 * Author: Thomas E. Dickey <[e-mail]> 1999
 *
 * $Id: dots.c,v 1.8 2002/04/06 21:33:42 tom Exp $
 *
 * A simple demo of the terminfo interface.
 */
#include <time.h>

#include <test.priv.h>

#define valid(s) ((s != 0) && s != (char *)-1)

static bool interrupted = FALSE;

static int
outc(int c)
{
    if (interrupted) {
	char tmp = c;
	write(STDOUT_FILENO, &tmp, 1);
    } else {
	putc(c, stdout);
    }
    return 0;
}

static bool
outs(char *s)
{
    if (valid(s)) {
	tputs(s, 1, outc);
	return TRUE;
    }
    return FALSE;
}

static void
cleanup(void)
{
    outs(exit_attribute_mode);
    if (!outs(orig_colors))
	outs(orig_pair);
    outs(clear_screen);
    outs(cursor_normal);
}

static void
onsig(int n GCC_UNUSED)
{
    interrupted = TRUE;
    cleanup();
    ExitProgram(EXIT_FAILURE);
}

static float
ranf(void)
{
    long r = (rand() & 077777);
    return ((float) r / 32768.);
}

int
main(
	int argc GCC_UNUSED,
	char *argv[]GCC_UNUSED)
{
    int x, y, z, j, p;
    float r;
    float c;

    for (j = SIGHUP; j <= SIGTERM; j++)
	if (signal(j, SIG_IGN) != SIG_IGN)
	    signal(j, onsig);

    srand(time(0));
    setupterm((char *) 0, 1, (int *) 0);
    outs(clear_screen);
    outs(cursor_invisible);
    if (max_colors > 1) {
	if (!valid(set_a_foreground)
	    || !valid(set_a_background)
	    || (!valid(orig_colors) && !valid(orig_pair)))
	    max_colors = -1;
    }

    r = (float) (lines - 4);
    c = (float) (columns - 4);

    for (;;) {
	x = (int) (c * ranf()) + 2;
	y = (int) (r * ranf()) + 2;
	p = (ranf() > 0.9) ? '*' : ' ';

	tputs(tparm3(cursor_address, y, x), 1, outc);
	if (max_colors > 0) {
	    z = (int) (ranf() * max_colors);
	    if (ranf() > 0.01) {
		tputs(tparm2(set_a_foreground, z), 1, outc);
	    } else {
		tputs(tparm2(set_a_background, z), 1, outc);
	    }
	} else if (valid(exit_attribute_mode)
		   && valid(enter_reverse_mode)) {
	    if (ranf() <= 0.01)
		outs((ranf() > 0.6) ? enter_reverse_mode :
		     exit_attribute_mode);
	}
	outc(p);
	fflush(stdout);
    }
}