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 * @(#)display.c 8.1 (Berkeley) 6/6/93 34 * $FreeBSD: src/usr.bin/talk/display.c,v 1.7 1999/08/28 01:06:11 peter Exp $ 35 * $DragonFly: src/usr.bin/talk/display.c,v 1.2 2003/06/17 04:29:32 dillon Exp $ 36 */ 37 38 /* 39 * The window 'manager', initializes curses and handles the actual 40 * displaying of text 41 */ 42 #include "talk.h" 43 #include <ctype.h> 44 45 xwin_t my_win; 46 xwin_t his_win; 47 WINDOW *line_win; 48 49 int curses_initialized = 0; 50 51 /* 52 * max HAS to be a function, it is called with 53 * a argument of the form --foo at least once. 54 */ 55 int 56 max(a,b) 57 int a, b; 58 { 59 60 return (a > b ? a : b); 61 } 62 63 /* 64 * Display some text on somebody's window, processing some control 65 * characters while we are at it. 66 */ 67 void 68 display(win, text, size) 69 register xwin_t *win; 70 register char *text; 71 int size; 72 { 73 register int i; 74 char cch; 75 76 for (i = 0; i < size; i++) { 77 if (*text == '\n' || *text == '\r') { 78 waddch(win->x_win, '\n'); 79 getyx(win->x_win, win->x_line, win->x_col); 80 text++; 81 continue; 82 } 83 /* erase character */ 84 if ( *text == win->cerase 85 || *text == 010 /* BS */ 86 || *text == 0177 /* DEL */ 87 ) { 88 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 89 getyx(win->x_win, win->x_line, win->x_col); 90 waddch(win->x_win, ' '); 91 wmove(win->x_win, win->x_line, win->x_col); 92 getyx(win->x_win, win->x_line, win->x_col); 93 text++; 94 continue; 95 } 96 /* 97 * On word erase search backwards until we find 98 * the beginning of a word or the beginning of 99 * the line. 100 */ 101 if ( *text == win->werase 102 || *text == 027 /* ^W */ 103 ) { 104 int endcol, xcol, i, c; 105 106 endcol = win->x_col; 107 xcol = endcol - 1; 108 while (xcol >= 0) { 109 c = readwin(win->x_win, win->x_line, xcol); 110 if (c != ' ') 111 break; 112 xcol--; 113 } 114 while (xcol >= 0) { 115 c = readwin(win->x_win, win->x_line, xcol); 116 if (c == ' ') 117 break; 118 xcol--; 119 } 120 wmove(win->x_win, win->x_line, xcol + 1); 121 for (i = xcol + 1; i < endcol; i++) 122 waddch(win->x_win, ' '); 123 wmove(win->x_win, win->x_line, xcol + 1); 124 getyx(win->x_win, win->x_line, win->x_col); 125 text++; 126 continue; 127 } 128 /* line kill */ 129 if ( *text == win->kill 130 || *text == 025 /* ^U */ 131 ) { 132 wmove(win->x_win, win->x_line, 0); 133 wclrtoeol(win->x_win); 134 getyx(win->x_win, win->x_line, win->x_col); 135 text++; 136 continue; 137 } 138 if (*text == '\f') { 139 if (win == &my_win) 140 wrefresh(curscr); 141 text++; 142 continue; 143 } 144 if (*text == '\7') { 145 write(STDOUT_FILENO, text, 1); 146 text++; 147 continue; 148 } 149 if (!isprint((unsigned char)*text) && *text != '\t') { 150 waddch(win->x_win, '^'); 151 getyx(win->x_win, win->x_line, win->x_col); 152 cch = (*text & 63) + 64; 153 waddch(win->x_win, cch); 154 } else 155 waddch(win->x_win, (unsigned char)*text); 156 getyx(win->x_win, win->x_line, win->x_col); 157 text++; 158 } 159 wrefresh(win->x_win); 160 } 161 162 /* 163 * Read the character at the indicated position in win 164 */ 165 int 166 readwin(win, line, col) 167 WINDOW *win; 168 int line; 169 int col; 170 { 171 int oldline, oldcol; 172 register int c; 173 174 getyx(win, oldline, oldcol); 175 wmove(win, line, col); 176 c = winch(win); 177 wmove(win, oldline, oldcol); 178 return (c); 179 } 180