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. 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 * @(#)display.c 8.1 (Berkeley) 6/6/93 30 * $FreeBSD: src/usr.bin/talk/display.c,v 1.7 1999/08/28 01:06:11 peter Exp $ 31 * $DragonFly: src/usr.bin/talk/display.c,v 1.4 2003/10/04 20:36:52 hmp Exp $ 32 */ 33 34 /* 35 * The window 'manager', initializes curses and handles the actual 36 * displaying of text 37 */ 38 #include "talk.h" 39 #include <ctype.h> 40 41 xwin_t my_win; 42 xwin_t his_win; 43 WINDOW *line_win; 44 45 int curses_initialized = 0; 46 47 /* 48 * max HAS to be a function, it is called with 49 * an argument of the form --foo at least once. 50 */ 51 int 52 max(int a, int b) 53 { 54 55 return (a > b ? a : b); 56 } 57 58 /* 59 * Display some text on somebody's window, processing some control 60 * characters while we are at it. 61 */ 62 void 63 display(xwin_t *win, char *text, int size) 64 { 65 int i; 66 char cch; 67 68 for (i = 0; i < size; i++) { 69 if (*text == '\n' || *text == '\r') { 70 waddch(win->x_win, '\n'); 71 getyx(win->x_win, win->x_line, win->x_col); 72 text++; 73 continue; 74 } 75 if (*text == 004 && win == &my_win) { 76 /* control-D clears the screen */ 77 werase(my_win.x_win); 78 getyx(my_win.x_win, my_win.x_line, my_win.x_col); 79 wrefresh(my_win.x_win); 80 werase(his_win.x_win); 81 getyx(his_win.x_win, his_win.x_line, his_win.x_col); 82 wrefresh(his_win.x_win); 83 text++; 84 continue; 85 } 86 87 /* erase character */ 88 if ( *text == win->cerase 89 || *text == 010 /* BS */ 90 || *text == 0177 /* DEL */ 91 ) { 92 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 93 getyx(win->x_win, win->x_line, win->x_col); 94 waddch(win->x_win, ' '); 95 wmove(win->x_win, win->x_line, win->x_col); 96 getyx(win->x_win, win->x_line, win->x_col); 97 text++; 98 continue; 99 } 100 /* 101 * On word erase search backwards until we find 102 * the beginning of a word or the beginning of 103 * the line. 104 */ 105 if ( *text == win->werase 106 || *text == 027 /* ^W */ 107 ) { 108 int endcol, xcol, ii, c; 109 110 endcol = win->x_col; 111 xcol = endcol - 1; 112 while (xcol >= 0) { 113 c = readwin(win->x_win, win->x_line, xcol); 114 if (c != ' ') 115 break; 116 xcol--; 117 } 118 while (xcol >= 0) { 119 c = readwin(win->x_win, win->x_line, xcol); 120 if (c == ' ') 121 break; 122 xcol--; 123 } 124 wmove(win->x_win, win->x_line, xcol + 1); 125 for (ii = xcol + 1; ii < endcol; ii++) 126 waddch(win->x_win, ' '); 127 wmove(win->x_win, win->x_line, xcol + 1); 128 getyx(win->x_win, win->x_line, win->x_col); 129 text++; 130 continue; 131 } 132 /* line kill */ 133 if ( *text == win->kill 134 || *text == 025 /* ^U */ 135 ) { 136 wmove(win->x_win, win->x_line, 0); 137 wclrtoeol(win->x_win); 138 getyx(win->x_win, win->x_line, win->x_col); 139 text++; 140 continue; 141 } 142 if (*text == '\f') { 143 if (win == &my_win) 144 wrefresh(curscr); 145 text++; 146 continue; 147 } 148 if (*text == '\7') { 149 write(STDOUT_FILENO, text, 1); 150 text++; 151 continue; 152 } 153 if (!isprint((unsigned char)*text) && *text != '\t') { 154 waddch(win->x_win, '^'); 155 getyx(win->x_win, win->x_line, win->x_col); 156 cch = (*text & 63) + 64; 157 waddch(win->x_win, cch); 158 } else 159 waddch(win->x_win, (unsigned char)*text); 160 getyx(win->x_win, win->x_line, win->x_col); 161 text++; 162 } 163 wrefresh(win->x_win); 164 } 165 166 /* 167 * Read the character at the indicated position in win 168 */ 169 int 170 readwin(WINDOW *win, int line, int col) 171 { 172 int oldline, oldcol; 173 int c; 174 175 getyx(win, oldline, oldcol); 176 wmove(win, line, col); 177 c = winch(win); 178 wmove(win, oldline, oldcol); 179 return (c); 180 } 181