NetBSD/lib/libcurses/PSD.doc/ex2.c

.\" Copyright (c) 1992, 1993
.\"	 The Regents of the University of California.  All rights reserved.
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"     @(#)ex2.c	8.1 (Berkeley) 6/8/93
.\"
#include <curses.h>
#include <stdio.h>
#include <signal.h>

#define YSIZE LINES
#define XSIZE COLS

static int quit();

/*
 * This program fills the screen up with characters and the allows the user to
 * manipulate the text on the screen using some basic commands.
 * Nothing fancy, just a demonstration of the elementary features of the
 * curses(3) package.
 */
main()
{
	int i, j, c, n, d = 0;
	char id[100];
	int hh = 0;
	int curx, cury, base, arg;
	
	initscr();
	signal(SIGINT, quit);
	crmode();
	noecho();
	nonl();
	delwin(stdscr);
	stdscr = newwin(YSIZE, XSIZE, 0, 0);
	flushok(stdscr, TRUE);
	scrollok(stdscr, TRUE);
	erase();
	refresh();

	move(0,0);
	refresh();
	for (i = 0; i < YSIZE + 2; i++) {
		(void)snprintf(id, sizeof id, "%d: ", i);
		addstr(id);
		for (j = 0; j < XSIZE - strlen(id); j++)
			addch('0' + (i % 10));
	}
	c = getchar();
	base = 2;
	curx = cury = 0;
	move(0, 0);
	refresh();

	/*
	 * The screen manipulator has the following commands:
	 * 'D' - clear to the end of the current line.
	 * 'B' - clear to the bottom of the screen.
	 * 'E' - erase the screen.
	 * 's' - enter standout mode.
	 * 'e' - exit standout mode.
	 * 'd' n - delete n lines below cursor line.
	 * 'i' n - insert n lines below cursor line.
	 * 'q' - quit.
	 * 'f' - move cursor one position to the right.
	 * 'b' - move cursor one position to the left.
	 * 'n' - move cursor one line down.
	 * 'p' - move cursor one line up.
	 * 'h' - home cusor.
	 * 'l' - force refresh.
	 * 'r' - simulate a carriage return.
	 *
	 * All other characters are ignored.
	 */
	for(;;) {
		switch(c = getchar()) {
		case 'D':
			clrtoeol();
			refresh();
			continue;
		case 'B':
			clrtobot();
			refresh();
			continue;
		case 'E':
			erase();
			refresh();
			continue;
		case 's':
			standout();
			continue;
		case 'e':
			standend();
			continue;
		case 'd':
			arg = getchar() - '0';
			for (i = 0; i < arg; i++)
				deleteln();
			refresh();
			continue;
		case 'i':
			arg = getchar() - '0';
			for (i = 0; i < arg; i++)
				insertln();
			refresh();
			continue;
		case 'q':
			quit();
		case 'f':
			if (curx < XSIZE - 1)
				curx++;
			else {
				cury++;
				curx = 0;
			}
			break;
		case 'b':
			if (curx == 0) {
				cury--;
				curx = XSIZE - 1;
			} else
				curx--;
			break;
		case 'n':
			cury++;
			break;
		case 'p':
			cury--;
			break;
		case 'h':
			curx = cury = 0;
			break;
		case 'l':
			wrefresh(curscr);
			continue;
		case 'r':   /* return */
		{
			int x, y;
			getyx(stdscr, y, x);
			move(y+1, 0);
			insertln();
			move(y, x);
			clrtoeol();
			refresh();
			continue;
		}
		default:
			continue;
		}

		if (cury < 0) {
			base--;
			move(0, 0);
			insertln();
			(void)snprintf(id, sizeof id, "%d: ", base);
			addstr(id);
			for (j = 0; j < XSIZE - strlen(id) - 2; j++) 
				addch('0' + (base % 10));
			cury++;
		} else if (cury >= YSIZE) {
			move(0, 0);
			deleteln();
			move(YSIZE - 1, 0);
			(void)snprintf(id, sizeof id, "%d: ", base + YSIZE);
			addstr(id);
			for (j = 0; j < XSIZE - strlen(id) - 2; j++)
				addch('0' + ((base + YSIZE) % 10));
			cury--;
			base++;
		}
		move(cury, curx);
		refresh();
	}
}

int
quit()
{
	erase();
	refresh();
	endwin();
	exit(0);
}