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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifndef lint 35 static const char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 38 /* 39 * The window 'manager', initializes curses and handles the actual 40 * displaying of text 41 */ 42 #include <ctype.h> 43 #include <unistd.h> 44 45 #include "talk.h" 46 47 xwin_t my_win; 48 xwin_t his_win; 49 WINDOW *line_win; 50 51 int curses_initialized = 0; 52 53 /* 54 * max HAS to be a function, it is called with 55 * an argument of the form --foo at least once. 56 */ 57 int 58 max(int a, int b) 59 { 60 61 return (a > b ? a : b); 62 } 63 64 /* 65 * Display some text on somebody's window, processing some control 66 * characters while we are at it. 67 */ 68 void 69 display(xwin_t *win, char *text, int size) 70 { 71 int i; 72 char cch; 73 74 for (i = 0; i < size; i++) { 75 if (*text == '\n' || *text == '\r') { 76 waddch(win->x_win, '\n'); 77 getyx(win->x_win, win->x_line, win->x_col); 78 text++; 79 continue; 80 } 81 if (*text == 004 && win == &my_win) { 82 /* control-D clears the screen */ 83 werase(my_win.x_win); 84 getyx(my_win.x_win, my_win.x_line, my_win.x_col); 85 wrefresh(my_win.x_win); 86 werase(his_win.x_win); 87 getyx(his_win.x_win, his_win.x_line, his_win.x_col); 88 wrefresh(his_win.x_win); 89 text++; 90 continue; 91 } 92 93 /* erase character */ 94 if ( *text == win->cerase 95 || *text == 010 /* BS */ 96 || *text == 0177 /* DEL */ 97 ) { 98 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 99 getyx(win->x_win, win->x_line, win->x_col); 100 waddch(win->x_win, ' '); 101 wmove(win->x_win, win->x_line, win->x_col); 102 getyx(win->x_win, win->x_line, win->x_col); 103 text++; 104 continue; 105 } 106 /* 107 * On word erase search backwards until we find 108 * the beginning of a word or the beginning of 109 * the line. 110 */ 111 if ( *text == win->werase 112 || *text == 027 /* ^W */ 113 ) { 114 int endcol, xcol, ii, c; 115 116 endcol = win->x_col; 117 xcol = endcol - 1; 118 while (xcol >= 0) { 119 c = readwin(win->x_win, win->x_line, xcol); 120 if (c != ' ') 121 break; 122 xcol--; 123 } 124 while (xcol >= 0) { 125 c = readwin(win->x_win, win->x_line, xcol); 126 if (c == ' ') 127 break; 128 xcol--; 129 } 130 wmove(win->x_win, win->x_line, xcol + 1); 131 for (ii = xcol + 1; ii < endcol; ii++) 132 waddch(win->x_win, ' '); 133 wmove(win->x_win, win->x_line, xcol + 1); 134 getyx(win->x_win, win->x_line, win->x_col); 135 text++; 136 continue; 137 } 138 /* line kill */ 139 if ( *text == win->kill 140 || *text == 025 /* ^U */ 141 ) { 142 wmove(win->x_win, win->x_line, 0); 143 wclrtoeol(win->x_win); 144 getyx(win->x_win, win->x_line, win->x_col); 145 text++; 146 continue; 147 } 148 if (*text == '\f') { 149 if (win == &my_win) 150 wrefresh(curscr); 151 text++; 152 continue; 153 } 154 if (*text == '\7') { 155 write(STDOUT_FILENO, text, 1); 156 text++; 157 continue; 158 } 159 if (!isprint((unsigned char)*text) && *text != '\t') { 160 waddch(win->x_win, '^'); 161 getyx(win->x_win, win->x_line, win->x_col); 162 cch = (*text & 63) + 64; 163 waddch(win->x_win, cch); 164 } else 165 waddch(win->x_win, (unsigned char)*text); 166 getyx(win->x_win, win->x_line, win->x_col); 167 text++; 168 } 169 wrefresh(win->x_win); 170 } 171 172 /* 173 * Read the character at the indicated position in win 174 */ 175 int 176 readwin(WINDOW *win, int line, int col) 177 { 178 int oldline, oldcol; 179 int c; 180 181 getyx(win, oldline, oldcol); 182 wmove(win, line, col); 183 c = winch(win); 184 wmove(win, oldline, oldcol); 185 return (c); 186 } 187