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#ifndef __APPLE__ 37__FBSDID("$FreeBSD: src/usr.bin/talk/display.c,v 1.11 2003/07/04 20:44:25 luigi Exp $"); 38 39#ifndef lint 40static const char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 41#endif 42#endif /* __APPLE__ */ 43 44/* 45 * The window 'manager', initializes curses and handles the actual 46 * displaying of text 47 */ 48#include <ctype.h> 49 50#include "talk.h" 51 52xwin_t my_win; 53xwin_t his_win; 54WINDOW *line_win; 55 56int curses_initialized = 0; 57 58/* 59 * max HAS to be a function, it is called with 60 * an argument of the form --foo at least once. 61 */ 62int 63max(a,b) 64 int a, b; 65{ 66 67 return (a > b ? a : b); 68} 69 70/* 71 * Display some text on somebody's window, processing some control 72 * characters while we are at it. 73 */ 74void 75display(win, text, size) 76 xwin_t *win; 77 char *text; 78 int size; 79{ 80 int i; 81 char cch; 82 83 for (i = 0; i < size; i++) { 84 if (*text == '\n' || *text == '\r') { 85 waddch(win->x_win, '\n'); 86 getyx(win->x_win, win->x_line, win->x_col); 87 text++; 88 continue; 89 } 90 if (*text == 004 && win == &my_win) { 91 /* control-D clears the screen */ 92 werase(my_win.x_win); 93 getyx(my_win.x_win, my_win.x_line, my_win.x_col); 94 wrefresh(my_win.x_win); 95 werase(his_win.x_win); 96 getyx(his_win.x_win, his_win.x_line, his_win.x_col); 97 wrefresh(his_win.x_win); 98 text++; 99 continue; 100 } 101 102 /* erase character */ 103 if ( *text == win->cerase 104 || *text == 010 /* BS */ 105 || *text == 0177 /* DEL */ 106 ) { 107 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 108 getyx(win->x_win, win->x_line, win->x_col); 109 waddch(win->x_win, ' '); 110 wmove(win->x_win, win->x_line, win->x_col); 111 getyx(win->x_win, win->x_line, win->x_col); 112 text++; 113 continue; 114 } 115 /* 116 * On word erase search backwards until we find 117 * the beginning of a word or the beginning of 118 * the line. 119 */ 120 if ( *text == win->werase 121 || *text == 027 /* ^W */ 122 ) { 123 int endcol, xcol, ii, c; 124 125 endcol = win->x_col; 126 xcol = endcol - 1; 127 while (xcol >= 0) { 128 c = readwin(win->x_win, win->x_line, xcol); 129 if (c != ' ') 130 break; 131 xcol--; 132 } 133 while (xcol >= 0) { 134 c = readwin(win->x_win, win->x_line, xcol); 135 if (c == ' ') 136 break; 137 xcol--; 138 } 139 wmove(win->x_win, win->x_line, xcol + 1); 140 for (ii = xcol + 1; ii < endcol; ii++) 141 waddch(win->x_win, ' '); 142 wmove(win->x_win, win->x_line, xcol + 1); 143 getyx(win->x_win, win->x_line, win->x_col); 144 text++; 145 continue; 146 } 147 /* line kill */ 148 if ( *text == win->kill 149 || *text == 025 /* ^U */ 150 ) { 151 wmove(win->x_win, win->x_line, 0); 152 wclrtoeol(win->x_win); 153 getyx(win->x_win, win->x_line, win->x_col); 154 text++; 155 continue; 156 } 157 if (*text == '\f') { 158 if (win == &my_win) 159 wrefresh(curscr); 160 text++; 161 continue; 162 } 163 if (*text == '\7') { 164 write(STDOUT_FILENO, text, 1); 165 text++; 166 continue; 167 } 168 if (!isprint((unsigned char)*text) && *text != '\t') { 169 waddch(win->x_win, '^'); 170 getyx(win->x_win, win->x_line, win->x_col); 171 cch = (*text & 63) + 64; 172 waddch(win->x_win, cch); 173 } else 174 waddch(win->x_win, (unsigned char)*text); 175 getyx(win->x_win, win->x_line, win->x_col); 176 text++; 177 } 178 wrefresh(win->x_win); 179} 180 181/* 182 * Read the character at the indicated position in win 183 */ 184int 185readwin(win, line, col) 186 WINDOW *win; 187 int line; 188 int col; 189{ 190 int oldline, oldcol; 191 int c; 192 193 getyx(win, oldline, oldcol); 194 wmove(win, line, col); 195 c = winch(win); 196 wmove(win, oldline, oldcol); 197 return (c); 198} 199