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 1.3 2003/08/24 15:51:45 drhodus 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(a,b) 57 int a, b; 58 { 59 60 return (a > b ? a : b); 61 } 62 63 /* 64 * Display some text on somebody's window, processing some control 65 * characters while we are at it. 66 */ 67 void 68 display(win, text, size) 69 xwin_t *win; 70 char *text; 71 int size; 72 { 73 int i; 74 char cch; 75 76 for (i = 0; i < size; i++) { 77 if (*text == '\n' || *text == '\r') { 78 waddch(win->x_win, '\n'); 79 getyx(win->x_win, win->x_line, win->x_col); 80 text++; 81 continue; 82 } 83 if (*text == 004 && win == &my_win) { 84 /* control-D clears the screen */ 85 werase(my_win.x_win); 86 getyx(my_win.x_win, my_win.x_line, my_win.x_col); 87 wrefresh(my_win.x_win); 88 werase(his_win.x_win); 89 getyx(his_win.x_win, his_win.x_line, his_win.x_col); 90 wrefresh(his_win.x_win); 91 text++; 92 continue; 93 } 94 95 /* erase character */ 96 if ( *text == win->cerase 97 || *text == 010 /* BS */ 98 || *text == 0177 /* DEL */ 99 ) { 100 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 101 getyx(win->x_win, win->x_line, win->x_col); 102 waddch(win->x_win, ' '); 103 wmove(win->x_win, win->x_line, win->x_col); 104 getyx(win->x_win, win->x_line, win->x_col); 105 text++; 106 continue; 107 } 108 /* 109 * On word erase search backwards until we find 110 * the beginning of a word or the beginning of 111 * the line. 112 */ 113 if ( *text == win->werase 114 || *text == 027 /* ^W */ 115 ) { 116 int endcol, xcol, ii, c; 117 118 endcol = win->x_col; 119 xcol = endcol - 1; 120 while (xcol >= 0) { 121 c = readwin(win->x_win, win->x_line, xcol); 122 if (c != ' ') 123 break; 124 xcol--; 125 } 126 while (xcol >= 0) { 127 c = readwin(win->x_win, win->x_line, xcol); 128 if (c == ' ') 129 break; 130 xcol--; 131 } 132 wmove(win->x_win, win->x_line, xcol + 1); 133 for (ii = xcol + 1; ii < endcol; ii++) 134 waddch(win->x_win, ' '); 135 wmove(win->x_win, win->x_line, xcol + 1); 136 getyx(win->x_win, win->x_line, win->x_col); 137 text++; 138 continue; 139 } 140 /* line kill */ 141 if ( *text == win->kill 142 || *text == 025 /* ^U */ 143 ) { 144 wmove(win->x_win, win->x_line, 0); 145 wclrtoeol(win->x_win); 146 getyx(win->x_win, win->x_line, win->x_col); 147 text++; 148 continue; 149 } 150 if (*text == '\f') { 151 if (win == &my_win) 152 wrefresh(curscr); 153 text++; 154 continue; 155 } 156 if (*text == '\7') { 157 write(STDOUT_FILENO, text, 1); 158 text++; 159 continue; 160 } 161 if (!isprint((unsigned char)*text) && *text != '\t') { 162 waddch(win->x_win, '^'); 163 getyx(win->x_win, win->x_line, win->x_col); 164 cch = (*text & 63) + 64; 165 waddch(win->x_win, cch); 166 } else 167 waddch(win->x_win, (unsigned char)*text); 168 getyx(win->x_win, win->x_line, win->x_col); 169 text++; 170 } 171 wrefresh(win->x_win); 172 } 173 174 /* 175 * Read the character at the indicated position in win 176 */ 177 int 178 readwin(win, line, col) 179 WINDOW *win; 180 int line; 181 int col; 182 { 183 int oldline, oldcol; 184 int c; 185 186 getyx(win, oldline, oldcol); 187 wmove(win, line, col); 188 c = winch(win); 189 wmove(win, oldline, oldcol); 190 return (c); 191 } 192