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