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 1.4 2003/10/04 20:36:52 hmp 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(int a, int b) 57 { 58 59 return (a > b ? a : b); 60 } 61 62 /* 63 * Display some text on somebody's window, processing some control 64 * characters while we are at it. 65 */ 66 void 67 display(xwin_t *win, char *text, int size) 68 { 69 int i; 70 char cch; 71 72 for (i = 0; i < size; i++) { 73 if (*text == '\n' || *text == '\r') { 74 waddch(win->x_win, '\n'); 75 getyx(win->x_win, win->x_line, win->x_col); 76 text++; 77 continue; 78 } 79 if (*text == 004 && win == &my_win) { 80 /* control-D clears the screen */ 81 werase(my_win.x_win); 82 getyx(my_win.x_win, my_win.x_line, my_win.x_col); 83 wrefresh(my_win.x_win); 84 werase(his_win.x_win); 85 getyx(his_win.x_win, his_win.x_line, his_win.x_col); 86 wrefresh(his_win.x_win); 87 text++; 88 continue; 89 } 90 91 /* erase character */ 92 if ( *text == win->cerase 93 || *text == 010 /* BS */ 94 || *text == 0177 /* DEL */ 95 ) { 96 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 97 getyx(win->x_win, win->x_line, win->x_col); 98 waddch(win->x_win, ' '); 99 wmove(win->x_win, win->x_line, win->x_col); 100 getyx(win->x_win, win->x_line, win->x_col); 101 text++; 102 continue; 103 } 104 /* 105 * On word erase search backwards until we find 106 * the beginning of a word or the beginning of 107 * the line. 108 */ 109 if ( *text == win->werase 110 || *text == 027 /* ^W */ 111 ) { 112 int endcol, xcol, ii, c; 113 114 endcol = win->x_col; 115 xcol = endcol - 1; 116 while (xcol >= 0) { 117 c = readwin(win->x_win, win->x_line, xcol); 118 if (c != ' ') 119 break; 120 xcol--; 121 } 122 while (xcol >= 0) { 123 c = readwin(win->x_win, win->x_line, xcol); 124 if (c == ' ') 125 break; 126 xcol--; 127 } 128 wmove(win->x_win, win->x_line, xcol + 1); 129 for (ii = xcol + 1; ii < endcol; ii++) 130 waddch(win->x_win, ' '); 131 wmove(win->x_win, win->x_line, xcol + 1); 132 getyx(win->x_win, win->x_line, win->x_col); 133 text++; 134 continue; 135 } 136 /* line kill */ 137 if ( *text == win->kill 138 || *text == 025 /* ^U */ 139 ) { 140 wmove(win->x_win, win->x_line, 0); 141 wclrtoeol(win->x_win); 142 getyx(win->x_win, win->x_line, win->x_col); 143 text++; 144 continue; 145 } 146 if (*text == '\f') { 147 if (win == &my_win) 148 wrefresh(curscr); 149 text++; 150 continue; 151 } 152 if (*text == '\7') { 153 write(STDOUT_FILENO, text, 1); 154 text++; 155 continue; 156 } 157 if (!isprint((unsigned char)*text) && *text != '\t') { 158 waddch(win->x_win, '^'); 159 getyx(win->x_win, win->x_line, win->x_col); 160 cch = (*text & 63) + 64; 161 waddch(win->x_win, cch); 162 } else 163 waddch(win->x_win, (unsigned char)*text); 164 getyx(win->x_win, win->x_line, win->x_col); 165 text++; 166 } 167 wrefresh(win->x_win); 168 } 169 170 /* 171 * Read the character at the indicated position in win 172 */ 173 int 174 readwin(WINDOW *win, int line, int col) 175 { 176 int oldline, oldcol; 177 int c; 178 179 getyx(win, oldline, oldcol); 180 wmove(win, line, col); 181 c = winch(win); 182 wmove(win, oldline, oldcol); 183 return (c); 184 } 185