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 1.4 2003/10/04 20:36:52 hmp 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(int a, int b)
  57 {
  58
  59         return (a > b ? a : b);
  60 }
  61
  62 /*
  63  * Display some text on somebody's window, processing some control
  64  * characters while we are at it.
  65  */
  66 void
  67 display(xwin_t *win, char *text, int size)
  68 {
  69         int i;
  70         char cch;
  71
  72         for (i = 0; i < size; i++) {
  73                 if (*text == '\n' || *text == '\r') {
  74                         waddch(win->x_win, '\n');
  75                         getyx(win->x_win, win->x_line, win->x_col);
  76                         text++;
  77                         continue;
  78                 }
  79                 if (*text == 004 && win == &my_win) {
  80                         /* control-D clears the screen */
  81                         werase(my_win.x_win);
  82                         getyx(my_win.x_win, my_win.x_line, my_win.x_col);
  83                         wrefresh(my_win.x_win);
  84                         werase(his_win.x_win);
  85                         getyx(his_win.x_win, his_win.x_line, his_win.x_col);
  86                         wrefresh(his_win.x_win);
  87                         text++;
  88                         continue;
  89                 }
  90
  91                 /* erase character */
  92                 if (   *text == win->cerase
  93                     || *text == 010     /* BS */
  94                     || *text == 0177    /* DEL */
  95                    ) {
  96                         wmove(win->x_win, win->x_line, max(--win->x_col, 0));
  97                         getyx(win->x_win, win->x_line, win->x_col);
  98                         waddch(win->x_win, ' ');
  99                         wmove(win->x_win, win->x_line, win->x_col);
 100                         getyx(win->x_win, win->x_line, win->x_col);
 101                         text++;
 102                         continue;
 103                 }
 104                 /*
 105                  * On word erase search backwards until we find
 106                  * the beginning of a word or the beginning of
 107                  * the line.
 108                  */
 109                 if (   *text == win->werase
 110                     || *text == 027     /* ^W */
 111                    ) {
 112                         int endcol, xcol, ii, c;
 113
 114                         endcol = win->x_col;
 115                         xcol = endcol - 1;
 116                         while (xcol >= 0) {
 117                                 c = readwin(win->x_win, win->x_line, xcol);
 118                                 if (c != ' ')
 119                                         break;
 120                                 xcol--;
 121                         }
 122                         while (xcol >= 0) {
 123                                 c = readwin(win->x_win, win->x_line, xcol);
 124                                 if (c == ' ')
 125                                         break;
 126                                 xcol--;
 127                         }
 128                         wmove(win->x_win, win->x_line, xcol + 1);
 129                         for (ii = xcol + 1; ii < endcol; ii++)
 130                                 waddch(win->x_win, ' ');
 131                         wmove(win->x_win, win->x_line, xcol + 1);
 132                         getyx(win->x_win, win->x_line, win->x_col);
 133                         text++;
 134                         continue;
 135                 }
 136                 /* line kill */
 137                 if (   *text == win->kill
 138                     || *text == 025     /* ^U */
 139                    ) {
 140                         wmove(win->x_win, win->x_line, 0);
 141                         wclrtoeol(win->x_win);
 142                         getyx(win->x_win, win->x_line, win->x_col);
 143                         text++;
 144                         continue;
 145                 }
 146                 if (*text == '\f') {
 147                         if (win == &my_win)
 148                                 wrefresh(curscr);
 149                         text++;
 150                         continue;
 151                 }
 152                 if (*text == '\7') {
 153                         write(STDOUT_FILENO, text, 1);
 154                         text++;
 155                         continue;
 156                 }
 157                 if (!isprint((unsigned char)*text) && *text != '\t') {
 158                         waddch(win->x_win, '^');
 159                         getyx(win->x_win, win->x_line, win->x_col);
 160                         cch = (*text & 63) + 64;
 161                         waddch(win->x_win, cch);
 162                 } else
 163                         waddch(win->x_win, (unsigned char)*text);
 164                 getyx(win->x_win, win->x_line, win->x_col);
 165                 text++;
 166         }
 167         wrefresh(win->x_win);
 168 }
 169
 170 /*
 171  * Read the character at the indicated position in win
 172  */
 173 int
 174 readwin(WINDOW *win, int line, int col)
 175 {
 176         int oldline, oldcol;
 177         int c;
 178
 179         getyx(win, oldline, oldcol);
 180         wmove(win, line, col);
 181         c = winch(win);
 182         wmove(win, oldline, oldcol);
 183         return (c);
 184 }