1 /* $NetBSD: display.c,v 1.8 2009/04/13 23:43:36 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 __RCSID("$NetBSD: display.c,v 1.8 2009/04/13 23:43:36 lukem Exp $"); 38 #endif /* not lint */ 39 40 /* 41 * The window 'manager', initializes curses and handles the actual 42 * displaying of text 43 */ 44 #include "talk.h" 45 #include <ctype.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 * a argument of the form --foo at least once. 56 */ 57 int 58 max(a,b) 59 int a, b; 60 { 61 62 return (a > b ? a : b); 63 } 64 65 /* 66 * Display some text on somebody's window, processing some control 67 * characters while we are at it. 68 */ 69 void 70 display(win, text, size) 71 xwin_t *win; 72 char *text; 73 int size; 74 { 75 int i; 76 char cch; 77 78 for (i = 0; i < size; i++) { 79 if (*text == '\n') { 80 xscroll(win, 0); 81 text++; 82 continue; 83 } 84 /* erase character */ 85 if (*text == win->cerase) { 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 int endcol, xcol, j, c; 101 102 endcol = win->x_col; 103 xcol = endcol - 1; 104 while (xcol >= 0) { 105 c = readwin(win->x_win, win->x_line, xcol); 106 if (c != ' ') 107 break; 108 xcol--; 109 } 110 while (xcol >= 0) { 111 c = readwin(win->x_win, win->x_line, xcol); 112 if (c == ' ') 113 break; 114 xcol--; 115 } 116 wmove(win->x_win, win->x_line, xcol + 1); 117 for (j = xcol + 1; j < endcol; j++) 118 waddch(win->x_win, ' '); 119 wmove(win->x_win, win->x_line, xcol + 1); 120 getyx(win->x_win, win->x_line, win->x_col); 121 text++; 122 continue; 123 } 124 /* line kill */ 125 if (*text == win->kill) { 126 wmove(win->x_win, win->x_line, 0); 127 wclrtoeol(win->x_win); 128 getyx(win->x_win, win->x_line, win->x_col); 129 text++; 130 continue; 131 } 132 if (*text == '\f') { 133 if (win == &my_win) 134 wrefresh(curscr); 135 text++; 136 continue; 137 } 138 if (*text == '\07') { 139 beep(); 140 text++; 141 continue; 142 } 143 if (win->x_col == COLS-1) { 144 /* check for wraparound */ 145 xscroll(win, 0); 146 } 147 if ( !isprint((u_char)*text) && *text != '\t') { 148 waddch(win->x_win, '^'); 149 getyx(win->x_win, win->x_line, win->x_col); 150 if (win->x_col == COLS-1) /* check for wraparound */ 151 xscroll(win, 0); 152 cch = (*text & 63) + 64; 153 waddch(win->x_win, cch); 154 } else 155 waddch(win->x_win, *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, col; 169 { 170 int oldline, oldcol; 171 int c; 172 173 getyx(win, oldline, oldcol); 174 wmove(win, line, col); 175 c = winch(win); 176 wmove(win, oldline, oldcol); 177 return (c); 178 } 179 180 /* 181 * Scroll a window, blanking out the line following the current line 182 * so that the current position is obvious 183 */ 184 void 185 xscroll(win, flag) 186 xwin_t *win; 187 int flag; 188 { 189 190 if (flag == -1) { 191 wmove(win->x_win, 0, 0); 192 win->x_line = 0; 193 win->x_col = 0; 194 return; 195 } 196 win->x_line = (win->x_line + 1) % win->x_nlines; 197 win->x_col = 0; 198 wmove(win->x_win, win->x_line, win->x_col); 199 wclrtoeol(win->x_win); 200 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 201 wclrtoeol(win->x_win); 202 wmove(win->x_win, win->x_line, win->x_col); 203 } 204