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