usr.bin/talk/display.c

   1 /*      $NetBSD: display.c,v 1.7 2003/08/07 11:16:04 agc Exp $  */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)display.c   8.1 (Berkeley) 6/6/93";
  36 #endif
  37 __RCSID("$NetBSD: display.c,v 1.7 2003/08/07 11:16:04 agc Exp $");
  38 #endif /* not lint */
  39
  40 /*
  41  * The window 'manager', initializes curses and handles the actual
  42  * displaying of text
  43  */
  44 #include "talk.h"
  45 #include <ctype.h>
  46
  47 xwin_t  my_win;
  48 xwin_t  his_win;
  49 WINDOW  *line_win;
  50
  51 int     curses_initialized = 0;
  52
  53 /*
  54  * max HAS to be a function, it is called with
  55  * a argument of the form --foo at least once.
  56  */
  57 int
  58 max(a,b)
  59         int a, b;
  60 {
  61
  62         return (a > b ? a : b);
  63 }
  64
  65 /*
  66  * Display some text on somebody's window, processing some control
  67  * characters while we are at it.
  68  */
  69 void
  70 display(win, text, size)
  71         xwin_t *win;
  72         char *text;
  73         int size;
  74 {
  75         int i;
  76         char cch;
  77
  78         for (i = 0; i < size; i++) {
  79                 if (*text == '\n') {
  80                         xscroll(win, 0);
  81                         text++;
  82                         continue;
  83                 }
  84                 /* erase character */
  85                 if (*text == win->cerase) {
  86                         wmove(win->x_win, win->x_line, max(--win->x_col, 0));
  87                         getyx(win->x_win, win->x_line, win->x_col);
  88                         waddch(win->x_win, ' ');
  89                         wmove(win->x_win, win->x_line, win->x_col);
  90                         getyx(win->x_win, win->x_line, win->x_col);
  91                         text++;
  92                         continue;
  93                 }
  94                 /*
  95                  * On word erase search backwards until we find
  96                  * the beginning of a word or the beginning of
  97                  * the line.
  98                  */
  99                 if (*text == win->werase) {
 100                         int endcol, xcol, j, c;
 101
 102                         endcol = win->x_col;
 103                         xcol = endcol - 1;
 104                         while (xcol >= 0) {
 105                                 c = readwin(win->x_win, win->x_line, xcol);
 106                                 if (c != ' ')
 107                                         break;
 108                                 xcol--;
 109                         }
 110                         while (xcol >= 0) {
 111                                 c = readwin(win->x_win, win->x_line, xcol);
 112                                 if (c == ' ')
 113                                         break;
 114                                 xcol--;
 115                         }
 116                         wmove(win->x_win, win->x_line, xcol + 1);
 117                         for (j = xcol + 1; j < endcol; j++)
 118                                 waddch(win->x_win, ' ');
 119                         wmove(win->x_win, win->x_line, xcol + 1);
 120                         getyx(win->x_win, win->x_line, win->x_col);
 121                         text++;
 122                         continue;
 123                 }
 124                 /* line kill */
 125                 if (*text == win->kill) {
 126                         wmove(win->x_win, win->x_line, 0);
 127                         wclrtoeol(win->x_win);
 128                         getyx(win->x_win, win->x_line, win->x_col);
 129                         text++;
 130                         continue;
 131                 }
 132                 if (*text == '\f') {
 133                         if (win == &my_win)
 134                                 wrefresh(curscr);
 135                         text++;
 136                         continue;
 137                 }
 138                 if (*text == '\07') {
 139                         beep();
 140                         text++;
 141                         continue;
 142                 }
 143                 if (win->x_col == COLS-1) {
 144                         /* check for wraparound */
 145                         xscroll(win, 0);
 146                 }
 147                 if ( !isprint((u_char)*text) && *text != '\t') {
 148                         waddch(win->x_win, '^');
 149                         getyx(win->x_win, win->x_line, win->x_col);
 150                         if (win->x_col == COLS-1) /* check for wraparound */
 151                                 xscroll(win, 0);
 152                         cch = (*text & 63) + 64;
 153                         waddch(win->x_win, cch);
 154                 } else
 155                         waddch(win->x_win, *text);
 156                 getyx(win->x_win, win->x_line, win->x_col);
 157                 text++;
 158         }
 159         wrefresh(win->x_win);
 160 }
 161
 162 /*
 163  * Read the character at the indicated position in win
 164  */
 165 int
 166 readwin(win, line, col)
 167         WINDOW *win;
 168         int line, col;
 169 {
 170         int oldline, oldcol;
 171         int c;
 172
 173         getyx(win, oldline, oldcol);
 174         wmove(win, line, col);
 175         c = winch(win);
 176         wmove(win, oldline, oldcol);
 177         return (c);
 178 }
 179
 180 /*
 181  * Scroll a window, blanking out the line following the current line
 182  * so that the current position is obvious
 183  */
 184 void
 185 xscroll(win, flag)
 186         xwin_t *win;
 187         int flag;
 188 {
 189
 190         if (flag == -1) {
 191                 wmove(win->x_win, 0, 0);
 192                 win->x_line = 0;
 193                 win->x_col = 0;
 194                 return;
 195         }
 196         win->x_line = (win->x_line + 1) % win->x_nlines;
 197         win->x_col = 0;
 198         wmove(win->x_win, win->x_line, win->x_col);
 199         wclrtoeol(win->x_win);
 200         wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
 201         wclrtoeol(win->x_win);
 202         wmove(win->x_win, win->x_line, win->x_col);
 203 }