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 #ifndef lint 35 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 36 #endif /* not lint */ 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 max(a,b) 56 int a, b; 57 { 58 59 return (a > b ? a : b); 60 } 61 62 /* 63 * Display some text on somebody's window, processing some control 64 * characters while we are at it. 65 */ 66 display(win, text, size) 67 register xwin_t *win; 68 register unsigned char *text; 69 int size; 70 { 71 register 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 /* erase character */ 82 if ( *text == win->cerase 83 || *text == 010 /* BS */ 84 || *text == 0177 /* DEL */ 85 ) { 86 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 87 getyx(win->x_win, win->x_line, win->x_col); 88 waddch(win->x_win, ' '); 89 wmove(win->x_win, win->x_line, win->x_col); 90 getyx(win->x_win, win->x_line, win->x_col); 91 text++; 92 continue; 93 } 94 /* 95 * On word erase search backwards until we find 96 * the beginning of a word or the beginning of 97 * the line. 98 */ 99 if ( *text == win->werase 100 || *text == 027 /* ^W */ 101 ) { 102 int endcol, xcol, i, c; 103 104 endcol = win->x_col; 105 xcol = endcol - 1; 106 while (xcol >= 0) { 107 c = readwin(win->x_win, win->x_line, xcol); 108 if (c != ' ') 109 break; 110 xcol--; 111 } 112 while (xcol >= 0) { 113 c = readwin(win->x_win, win->x_line, xcol); 114 if (c == ' ') 115 break; 116 xcol--; 117 } 118 wmove(win->x_win, win->x_line, xcol + 1); 119 for (i = xcol + 1; i < endcol; i++) 120 waddch(win->x_win, ' '); 121 wmove(win->x_win, win->x_line, xcol + 1); 122 getyx(win->x_win, win->x_line, win->x_col); 123 text++; 124 continue; 125 } 126 /* line kill */ 127 if ( *text == win->kill 128 || *text == 025 /* ^U */ 129 ) { 130 wmove(win->x_win, win->x_line, 0); 131 wclrtoeol(win->x_win); 132 getyx(win->x_win, win->x_line, win->x_col); 133 text++; 134 continue; 135 } 136 if (*text == '\f') { 137 if (win == &my_win) 138 wrefresh(curscr); 139 text++; 140 continue; 141 } 142 if (*text == '\7') { 143 _putchar(*text); 144 text++; 145 continue; 146 } 147 if (!isprint(*text) && *text != '\t') { 148 waddch(win->x_win, '^'); 149 getyx(win->x_win, win->x_line, win->x_col); 150 cch = (*text & 63) + 64; 151 waddch(win->x_win, cch); 152 } else 153 waddch(win->x_win, *text); 154 getyx(win->x_win, win->x_line, win->x_col); 155 text++; 156 } 157 wrefresh(win->x_win); 158 } 159 160 /* 161 * Read the character at the indicated position in win 162 */ 163 readwin(win, line, col) 164 WINDOW *win; 165 { 166 int oldline, oldcol; 167 register int c; 168 169 getyx(win, oldline, oldcol); 170 wmove(win, line, col); 171 c = winch(win); 172 wmove(win, oldline, oldcol); 173 return (c); 174 } 175