lib/libcurses/PSD.doc/ex2.c

   1 .\"     $NetBSD: ex2.c,v 1.7 2003/08/07 16:44:27 agc 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 cusor.
  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 }