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