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