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(int a, int b)
  62 {
  63
  64         return (a > b ? a : b);
  65 }
  66
  67 /*
  68  * Display some text on somebody's window, processing some control
  69  * characters while we are at it.
  70  */
  71 void
  72 display(xwin_t *win, char *text, int size)
  73 {
  74         int i;
  75         char cch;
  76
  77         for (i = 0; i < size; i++) {
  78                 if (*text == '\n' || *text == '\r') {
  79                         waddch(win->x_win, '\n');
  80                         getyx(win->x_win, win->x_line, win->x_col);
  81                         text++;
  82                         continue;
  83                 }
  84                 if (*text == 004 && win == &my_win) {
  85                         /* control-D clears the screen */
  86                         werase(my_win.x_win);
  87                         getyx(my_win.x_win, my_win.x_line, my_win.x_col);
  88                         wrefresh(my_win.x_win);
  89                         werase(his_win.x_win);
  90                         getyx(his_win.x_win, his_win.x_line, his_win.x_col);
  91                         wrefresh(his_win.x_win);
  92                         text++;
  93                         continue;
  94                 }
  95
  96                 /* erase character */
  97                 if (   *text == win->cerase
  98                     || *text == 010     /* BS */
  99                     || *text == 0177    /* DEL */
 100                    ) {
 101                         wmove(win->x_win, win->x_line, max(--win->x_col, 0));
 102                         getyx(win->x_win, win->x_line, win->x_col);
 103                         waddch(win->x_win, ' ');
 104                         wmove(win->x_win, win->x_line, win->x_col);
 105                         getyx(win->x_win, win->x_line, win->x_col);
 106                         text++;
 107                         continue;
 108                 }
 109                 /*
 110                  * On word erase search backwards until we find
 111                  * the beginning of a word or the beginning of
 112                  * the line.
 113                  */
 114                 if (   *text == win->werase
 115                     || *text == 027     /* ^W */
 116                    ) {
 117                         int endcol, xcol, ii, c;
 118
 119                         endcol = win->x_col;
 120                         xcol = endcol - 1;
 121                         while (xcol >= 0) {
 122                                 c = readwin(win->x_win, win->x_line, xcol);
 123                                 if (c != ' ')
 124                                         break;
 125                                 xcol--;
 126                         }
 127                         while (xcol >= 0) {
 128                                 c = readwin(win->x_win, win->x_line, xcol);
 129                                 if (c == ' ')
 130                                         break;
 131                                 xcol--;
 132                         }
 133                         wmove(win->x_win, win->x_line, xcol + 1);
 134                         for (ii = xcol + 1; ii < endcol; ii++)
 135                                 waddch(win->x_win, ' ');
 136                         wmove(win->x_win, win->x_line, xcol + 1);
 137                         getyx(win->x_win, win->x_line, win->x_col);
 138                         text++;
 139                         continue;
 140                 }
 141                 /* line kill */
 142                 if (   *text == win->kill
 143                     || *text == 025     /* ^U */
 144                    ) {
 145                         wmove(win->x_win, win->x_line, 0);
 146                         wclrtoeol(win->x_win);
 147                         getyx(win->x_win, win->x_line, win->x_col);
 148                         text++;
 149                         continue;
 150                 }
 151                 if (*text == '\f') {
 152                         if (win == &my_win)
 153                                 wrefresh(curscr);
 154                         text++;
 155                         continue;
 156                 }
 157                 if (*text == '\7') {
 158                         write(STDOUT_FILENO, text, 1);
 159                         text++;
 160                         continue;
 161                 }
 162                 if (!isprint((unsigned char)*text) && *text != '\t') {
 163                         waddch(win->x_win, '^');
 164                         getyx(win->x_win, win->x_line, win->x_col);
 165                         cch = (*text & 63) + 64;
 166                         waddch(win->x_win, cch);
 167                 } else
 168                         waddch(win->x_win, (unsigned char)*text);
 169                 getyx(win->x_win, win->x_line, win->x_col);
 170                 text++;
 171         }
 172         wrefresh(win->x_win);
 173 }
 174
 175 /*
 176  * Read the character at the indicated position in win
 177  */
 178 int
 179 readwin(WINDOW *win, int line, int col)
 180 {
 181         int oldline, oldcol;
 182         int c;
 183
 184         getyx(win, oldline, oldcol);
 185         wmove(win, line, col);
 186         c = winch(win);
 187         wmove(win, oldline, oldcol);
 188         return (c);
 189 }