1 /* $NetBSD: display.c,v 1.9 2011/09/06 18:32:03 joerg 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 1.9 2011/09/06 18:32:03 joerg 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(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') { 76 xscroll(win, 0); 77 text++; 78 continue; 79 } 80 /* erase character */ 81 if (*text == win->cerase) { 82 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 83 getyx(win->x_win, win->x_line, win->x_col); 84 waddch(win->x_win, ' '); 85 wmove(win->x_win, win->x_line, win->x_col); 86 getyx(win->x_win, win->x_line, win->x_col); 87 text++; 88 continue; 89 } 90 /* 91 * On word erase search backwards until we find 92 * the beginning of a word or the beginning of 93 * the line. 94 */ 95 if (*text == win->werase) { 96 int endcol, xcol, j, c; 97 98 endcol = win->x_col; 99 xcol = endcol - 1; 100 while (xcol >= 0) { 101 c = readwin(win->x_win, win->x_line, xcol); 102 if (c != ' ') 103 break; 104 xcol--; 105 } 106 while (xcol >= 0) { 107 c = readwin(win->x_win, win->x_line, xcol); 108 if (c == ' ') 109 break; 110 xcol--; 111 } 112 wmove(win->x_win, win->x_line, xcol + 1); 113 for (j = xcol + 1; j < endcol; j++) 114 waddch(win->x_win, ' '); 115 wmove(win->x_win, win->x_line, xcol + 1); 116 getyx(win->x_win, win->x_line, win->x_col); 117 text++; 118 continue; 119 } 120 /* line kill */ 121 if (*text == win->kill) { 122 wmove(win->x_win, win->x_line, 0); 123 wclrtoeol(win->x_win); 124 getyx(win->x_win, win->x_line, win->x_col); 125 text++; 126 continue; 127 } 128 if (*text == '\f') { 129 if (win == &my_win) 130 wrefresh(curscr); 131 text++; 132 continue; 133 } 134 if (*text == '\07') { 135 beep(); 136 text++; 137 continue; 138 } 139 if (win->x_col == COLS-1) { 140 /* check for wraparound */ 141 xscroll(win, 0); 142 } 143 if ( !isprint((u_char)*text) && *text != '\t') { 144 waddch(win->x_win, '^'); 145 getyx(win->x_win, win->x_line, win->x_col); 146 if (win->x_col == COLS-1) /* check for wraparound */ 147 xscroll(win, 0); 148 cch = (*text & 63) + 64; 149 waddch(win->x_win, cch); 150 } else 151 waddch(win->x_win, *text); 152 getyx(win->x_win, win->x_line, win->x_col); 153 text++; 154 } 155 wrefresh(win->x_win); 156 } 157 158 /* 159 * Read the character at the indicated position in win 160 */ 161 int 162 readwin(WINDOW *win, int line, int col) 163 { 164 int oldline, oldcol; 165 int c; 166 167 getyx(win, oldline, oldcol); 168 wmove(win, line, col); 169 c = winch(win); 170 wmove(win, oldline, oldcol); 171 return (c); 172 } 173 174 /* 175 * Scroll a window, blanking out the line following the current line 176 * so that the current position is obvious 177 */ 178 void 179 xscroll(xwin_t *win, int flag) 180 { 181 182 if (flag == -1) { 183 wmove(win->x_win, 0, 0); 184 win->x_line = 0; 185 win->x_col = 0; 186 return; 187 } 188 win->x_line = (win->x_line + 1) % win->x_nlines; 189 win->x_col = 0; 190 wmove(win->x_win, win->x_line, win->x_col); 191 wclrtoeol(win->x_win); 192 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 193 wclrtoeol(win->x_win); 194 wmove(win->x_win, win->x_line, win->x_col); 195 } 196
Indexes created Sat Sep 20 22:09:52 GMT 2025