usr.bin/talk/display.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)display.c        8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/talk/display.c,v 1.7 1999/08/28 01:06:11 peter Exp $
  35  * $DragonFly: src/usr.bin/talk/display.c,v 1.3 2003/08/24 15:51:45 drhodus Exp $
  36  */
  37
  38 /*
  39  * The window 'manager', initializes curses and handles the actual
  40  * displaying of text
  41  */
  42 #include "talk.h"
  43 #include <ctype.h>
  44
  45 xwin_t  my_win;
  46 xwin_t  his_win;
  47 WINDOW  *line_win;
  48
  49 int     curses_initialized = 0;
  50
  51 /*
  52  * max HAS to be a function, it is called with
  53  * an argument of the form --foo at least once.
  54  */
  55 int
  56 max(a,b)
  57         int a, b;
  58 {
  59
  60         return (a > b ? a : b);
  61 }
  62
  63 /*
  64  * Display some text on somebody's window, processing some control
  65  * characters while we are at it.
  66  */
  67 void
  68 display(win, text, size)
  69         xwin_t *win;
  70         char *text;
  71         int size;
  72 {
  73         int i;
  74         char cch;
  75
  76         for (i = 0; i < size; i++) {
  77                 if (*text == '\n' || *text == '\r') {
  78                         waddch(win->x_win, '\n');
  79                         getyx(win->x_win, win->x_line, win->x_col);
  80                         text++;
  81                         continue;
  82                 }
  83                 if (*text == 004 && win == &my_win) {
  84                         /* control-D clears the screen */
  85                         werase(my_win.x_win);
  86                         getyx(my_win.x_win, my_win.x_line, my_win.x_col);
  87                         wrefresh(my_win.x_win);
  88                         werase(his_win.x_win);
  89                         getyx(his_win.x_win, his_win.x_line, his_win.x_col);
  90                         wrefresh(his_win.x_win);
  91                         text++;
  92                         continue;
  93                 }
  94
  95                 /* erase character */
  96                 if (   *text == win->cerase
  97                     || *text == 010     /* BS */
  98                     || *text == 0177    /* DEL */
  99                    ) {
 100                         wmove(win->x_win, win->x_line, max(--win->x_col, 0));
 101                         getyx(win->x_win, win->x_line, win->x_col);
 102                         waddch(win->x_win, ' ');
 103                         wmove(win->x_win, win->x_line, win->x_col);
 104                         getyx(win->x_win, win->x_line, win->x_col);
 105                         text++;
 106                         continue;
 107                 }
 108                 /*
 109                  * On word erase search backwards until we find
 110                  * the beginning of a word or the beginning of
 111                  * the line.
 112                  */
 113                 if (   *text == win->werase
 114                     || *text == 027     /* ^W */
 115                    ) {
 116                         int endcol, xcol, ii, c;
 117
 118                         endcol = win->x_col;
 119                         xcol = endcol - 1;
 120                         while (xcol >= 0) {
 121                                 c = readwin(win->x_win, win->x_line, xcol);
 122                                 if (c != ' ')
 123                                         break;
 124                                 xcol--;
 125                         }
 126                         while (xcol >= 0) {
 127                                 c = readwin(win->x_win, win->x_line, xcol);
 128                                 if (c == ' ')
 129                                         break;
 130                                 xcol--;
 131                         }
 132                         wmove(win->x_win, win->x_line, xcol + 1);
 133                         for (ii = xcol + 1; ii < endcol; ii++)
 134                                 waddch(win->x_win, ' ');
 135                         wmove(win->x_win, win->x_line, xcol + 1);
 136                         getyx(win->x_win, win->x_line, win->x_col);
 137                         text++;
 138                         continue;
 139                 }
 140                 /* line kill */
 141                 if (   *text == win->kill
 142                     || *text == 025     /* ^U */
 143                    ) {
 144                         wmove(win->x_win, win->x_line, 0);
 145                         wclrtoeol(win->x_win);
 146                         getyx(win->x_win, win->x_line, win->x_col);
 147                         text++;
 148                         continue;
 149                 }
 150                 if (*text == '\f') {
 151                         if (win == &my_win)
 152                                 wrefresh(curscr);
 153                         text++;
 154                         continue;
 155                 }
 156                 if (*text == '\7') {
 157                         write(STDOUT_FILENO, text, 1);
 158                         text++;
 159                         continue;
 160                 }
 161                 if (!isprint((unsigned char)*text) && *text != '\t') {
 162                         waddch(win->x_win, '^');
 163                         getyx(win->x_win, win->x_line, win->x_col);
 164                         cch = (*text & 63) + 64;
 165                         waddch(win->x_win, cch);
 166                 } else
 167                         waddch(win->x_win, (unsigned char)*text);
 168                 getyx(win->x_win, win->x_line, win->x_col);
 169                 text++;
 170         }
 171         wrefresh(win->x_win);
 172 }
 173
 174 /*
 175  * Read the character at the indicated position in win
 176  */
 177 int
 178 readwin(win, line, col)
 179         WINDOW *win;
 180         int line;
 181         int col;
 182 {
 183         int oldline, oldcol;
 184         int c;
 185
 186         getyx(win, oldline, oldcol);
 187         wmove(win, line, col);
 188         c = winch(win);
 189         wmove(win, oldline, oldcol);
 190         return (c);
 191 }