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      1 .\"	$NetBSD: ex2.c,v 1.8 2022/07/06 12:33:41 andvar Exp $
      2 .\"
      3 .\" Copyright (c) 1992, 1993
      4 .\"	 The Regents of the University of California.  All rights reserved.
      5 .\"
      6 .\" Redistribution and use in source and binary forms, with or without
      7 .\" modification, are permitted provided that the following conditions
      8 .\" are met:
      9 .\" 1. Redistributions of source code must retain the above copyright
     10 .\"    notice, this list of conditions and the following disclaimer.
     11 .\" 2. Redistributions in binary form must reproduce the above copyright
     12 .\"    notice, this list of conditions and the following disclaimer in the
     13 .\"    documentation and/or other materials provided with the distribution.
     14 .\" 3. Neither the name of the University nor the names of its contributors
     15 .\"    may be used to endorse or promote products derived from this software
     16 .\"    without specific prior written permission.
     17 .\"
     18 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     19 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     22 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     24 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28 .\" SUCH DAMAGE.
     29 .\"
     30 .\"     @(#)ex2.c	8.1 (Berkeley) 6/8/93
     31 .\"
     32 #include <curses.h>
     33 #include <stdio.h>
     34 #include <signal.h>
     35 
     36 #define YSIZE LINES
     37 #define XSIZE COLS
     38 
     39 static int quit();
     40 
     41 /*
     42  * This program fills the screen up with characters and the allows the user to
     43  * manipulate the text on the screen using some basic commands.
     44  * Nothing fancy, just a demonstration of the elementary features of the
     45  * curses(3) package.
     46  */
     47 main()
     48 {
     49 	int i, j, c, n, d = 0;
     50 	char id[100];
     51 	int hh = 0;
     52 	int curx, cury, base, arg;
     53 
     54 	initscr();
     55 	signal(SIGINT, quit);
     56 	crmode();
     57 	noecho();
     58 	nonl();
     59 	delwin(stdscr);
     60 	stdscr = newwin(YSIZE, XSIZE, 0, 0);
     61 	flushok(stdscr, TRUE);
     62 	scrollok(stdscr, TRUE);
     63 	erase();
     64 	refresh();
     65 
     66 	move(0,0);
     67 	refresh();
     68 	for (i = 0; i < YSIZE + 2; i++) {
     69 		(void)snprintf(id, sizeof id, "%d: ", i);
     70 		addstr(id);
     71 		for (j = 0; j < XSIZE - strlen(id); j++)
     72 			addch('0' + (i % 10));
     73 	}
     74 	c = getchar();
     75 	base = 2;
     76 	curx = cury = 0;
     77 	move(0, 0);
     78 	refresh();
     79 
     80 	/*
     81 	 * The screen manipulator has the following commands:
     82 	 * 'D' - clear to the end of the current line.
     83 	 * 'B' - clear to the bottom of the screen.
     84 	 * 'E' - erase the screen.
     85 	 * 's' - enter standout mode.
     86 	 * 'e' - exit standout mode.
     87 	 * 'd' n - delete n lines below cursor line.
     88 	 * 'i' n - insert n lines below cursor line.
     89 	 * 'q' - quit.
     90 	 * 'f' - move cursor one position to the right.
     91 	 * 'b' - move cursor one position to the left.
     92 	 * 'n' - move cursor one line down.
     93 	 * 'p' - move cursor one line up.
     94 	 * 'h' - home cursor.
     95 	 * 'l' - force refresh.
     96 	 * 'r' - simulate a carriage return.
     97 	 *
     98 	 * All other characters are ignored.
     99 	 */
    100 	for(;;) {
    101 		switch(c = getchar()) {
    102 		case 'D':
    103 			clrtoeol();
    104 			refresh();
    105 			continue;
    106 		case 'B':
    107 			clrtobot();
    108 			refresh();
    109 			continue;
    110 		case 'E':
    111 			erase();
    112 			refresh();
    113 			continue;
    114 		case 's':
    115 			standout();
    116 			continue;
    117 		case 'e':
    118 			standend();
    119 			continue;
    120 		case 'd':
    121 			arg = getchar() - '0';
    122 			for (i = 0; i < arg; i++)
    123 				deleteln();
    124 			refresh();
    125 			continue;
    126 		case 'i':
    127 			arg = getchar() - '0';
    128 			for (i = 0; i < arg; i++)
    129 				insertln();
    130 			refresh();
    131 			continue;
    132 		case 'q':
    133 			quit();
    134 		case 'f':
    135 			if (curx < XSIZE - 1)
    136 				curx++;
    137 			else {
    138 				cury++;
    139 				curx = 0;
    140 			}
    141 			break;
    142 		case 'b':
    143 			if (curx == 0) {
    144 				cury--;
    145 				curx = XSIZE - 1;
    146 			} else
    147 				curx--;
    148 			break;
    149 		case 'n':
    150 			cury++;
    151 			break;
    152 		case 'p':
    153 			cury--;
    154 			break;
    155 		case 'h':
    156 			curx = cury = 0;
    157 			break;
    158 		case 'l':
    159 			wrefresh(curscr);
    160 			continue;
    161 		case 'r':   /* return */
    162 		{
    163 			int x, y;
    164 			getyx(stdscr, y, x);
    165 			move(y+1, 0);
    166 			insertln();
    167 			move(y, x);
    168 			clrtoeol();
    169 			refresh();
    170 			continue;
    171 		}
    172 		default:
    173 			continue;
    174 		}
    175 
    176 		if (cury < 0) {
    177 			base--;
    178 			move(0, 0);
    179 			insertln();
    180 			(void)snprintf(id, sizeof id, "%d: ", base);
    181 			addstr(id);
    182 			for (j = 0; j < XSIZE - strlen(id) - 2; j++)
    183 				addch('0' + (base % 10));
    184 			cury++;
    185 		} else if (cury >= YSIZE) {
    186 			move(0, 0);
    187 			deleteln();
    188 			move(YSIZE - 1, 0);
    189 			(void)snprintf(id, sizeof id, "%d: ", base + YSIZE);
    190 			addstr(id);
    191 			for (j = 0; j < XSIZE - strlen(id) - 2; j++)
    192 				addch('0' + ((base + YSIZE) % 10));
    193 			cury--;
    194 			base++;
    195 		}
    196 		move(cury, curx);
    197 		refresh();
    198 	}
    199 }
    200 
    201 int
    202 quit()
    203 {
    204 	erase();
    205 	refresh();
    206 	endwin();
    207 	exit(0);
    208 }
    209