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
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifndef lint
  39 static const char sccsid[] = "@(#)display.c     8.1 (Berkeley) 6/6/93";
  40 #endif
  41
  42 /*
  43  * The window 'manager', initializes curses and handles the actual
  44  * displaying of text
  45  */
  46 #include <ctype.h>
  47
  48 #include "talk.h"
  49
  50 xwin_t  my_win;
  51 xwin_t  his_win;
  52 WINDOW  *line_win;
  53
  54 int     curses_initialized = 0;
  55
  56 /*
  57  * max HAS to be a function, it is called with
  58  * an argument of the form --foo at least once.
  59  */
  60 int
  61 max(a,b)
  62         int a, b;
  63 {
  64
  65         return (a > b ? a : b);
  66 }
  67
  68 /*
  69  * Display some text on somebody's window, processing some control
  70  * characters while we are at it.
  71  */
  72 void
  73 display(win, text, size)
  74         xwin_t *win;
  75         char *text;
  76         int size;
  77 {
  78         int i;
  79         char cch;
  80
  81         for (i = 0; i < size; i++) {
  82                 if (*text == '\n' || *text == '\r') {
  83                         waddch(win->x_win, '\n');
  84                         getyx(win->x_win, win->x_line, win->x_col);
  85                         text++;
  86                         continue;
  87                 }
  88                 if (*text == 004 && win == &my_win) {
  89                         /* control-D clears the screen */
  90                         werase(my_win.x_win);
  91                         getyx(my_win.x_win, my_win.x_line, my_win.x_col);
  92                         wrefresh(my_win.x_win);
  93                         werase(his_win.x_win);
  94                         getyx(his_win.x_win, his_win.x_line, his_win.x_col);
  95                         wrefresh(his_win.x_win);
  96                         text++;
  97                         continue;
  98                 }
  99
 100                 /* erase character */
 101                 if (   *text == win->cerase
 102                     || *text == 010     /* BS */
 103                     || *text == 0177    /* DEL */
 104                    ) {
 105                         wmove(win->x_win, win->x_line, max(--win->x_col, 0));
 106                         getyx(win->x_win, win->x_line, win->x_col);
 107                         waddch(win->x_win, ' ');
 108                         wmove(win->x_win, win->x_line, win->x_col);
 109                         getyx(win->x_win, win->x_line, win->x_col);
 110                         text++;
 111                         continue;
 112                 }
 113                 /*
 114                  * On word erase search backwards until we find
 115                  * the beginning of a word or the beginning of
 116                  * the line.
 117                  */
 118                 if (   *text == win->werase
 119                     || *text == 027     /* ^W */
 120                    ) {
 121                         int endcol, xcol, ii, c;
 122
 123                         endcol = win->x_col;
 124                         xcol = endcol - 1;
 125                         while (xcol >= 0) {
 126                                 c = readwin(win->x_win, win->x_line, xcol);
 127                                 if (c != ' ')
 128                                         break;
 129                                 xcol--;
 130                         }
 131                         while (xcol >= 0) {
 132                                 c = readwin(win->x_win, win->x_line, xcol);
 133                                 if (c == ' ')
 134                                         break;
 135                                 xcol--;
 136                         }
 137                         wmove(win->x_win, win->x_line, xcol + 1);
 138                         for (ii = xcol + 1; ii < endcol; ii++)
 139                                 waddch(win->x_win, ' ');
 140                         wmove(win->x_win, win->x_line, xcol + 1);
 141                         getyx(win->x_win, win->x_line, win->x_col);
 142                         text++;
 143                         continue;
 144                 }
 145                 /* line kill */
 146                 if (   *text == win->kill
 147                     || *text == 025     /* ^U */
 148                    ) {
 149                         wmove(win->x_win, win->x_line, 0);
 150                         wclrtoeol(win->x_win);
 151                         getyx(win->x_win, win->x_line, win->x_col);
 152                         text++;
 153                         continue;
 154                 }
 155                 if (*text == '\f') {
 156                         if (win == &my_win)
 157                                 wrefresh(curscr);
 158                         text++;
 159                         continue;
 160                 }
 161                 if (*text == '\7') {
 162                         write(STDOUT_FILENO, text, 1);
 163                         text++;
 164                         continue;
 165                 }
 166                 if (!isprint((unsigned char)*text) && *text != '\t') {
 167                         waddch(win->x_win, '^');
 168                         getyx(win->x_win, win->x_line, win->x_col);
 169                         cch = (*text & 63) + 64;
 170                         waddch(win->x_win, cch);
 171                 } else
 172                         waddch(win->x_win, (unsigned char)*text);
 173                 getyx(win->x_win, win->x_line, win->x_col);
 174                 text++;
 175         }
 176         wrefresh(win->x_win);
 177 }
 178
 179 /*
 180  * Read the character at the indicated position in win
 181  */
 182 int
 183 readwin(win, line, col)
 184         WINDOW *win;
 185         int line;
 186         int col;
 187 {
 188         int oldline, oldcol;
 189         int c;
 190
 191         getyx(win, oldline, oldcol);
 192         wmove(win, line, col);
 193         c = winch(win);
 194         wmove(win, oldline, oldcol);
 195         return (c);
 196 }