1 /* $OpenBSD: display.c,v 1.6 1999/03/23 17:00:38 millert Exp $ */ 2 /* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 static char rcsid[] = "$OpenBSD: display.c,v 1.6 1999/03/23 17:00:38 millert Exp $"; 42 #endif /* not lint */ 43 44 /* 45 * The window 'manager', initializes curses and handles the actual 46 * displaying of text 47 */ 48 #include "talk.h" 49 #include <ctype.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 * a argument of the form --foo at least once. 60 */ 61 int 62 max(a,b) 63 int a, b; 64 { 65 66 return (a > b ? a : b); 67 } 68 69 /* 70 * Display some text on somebody's window, processing some control 71 * characters while we are at it. 72 */ 73 void 74 display(win, text, size) 75 register xwin_t *win; 76 register char *text; 77 int size; 78 { 79 register int i; 80 char cch; 81 82 for (i = 0; i < size; i++) { 83 /* 84 * Since we do not use curses's input routines we must 85 * convert '\r' -> '\n' ourselves. 86 */ 87 if (*text == '\r') 88 *text = '\n'; 89 if (*text == '\n') { 90 xscroll(win, 0); 91 text++; 92 continue; 93 } 94 /* erase character */ 95 if (*text == win->cerase) { 96 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 97 getyx(win->x_win, win->x_line, win->x_col); 98 waddch(win->x_win, ' '); 99 wmove(win->x_win, win->x_line, win->x_col); 100 getyx(win->x_win, win->x_line, win->x_col); 101 text++; 102 continue; 103 } 104 /* 105 * On word erase search backwards until we find 106 * the beginning of a word or the beginning of 107 * the line. 108 */ 109 if (*text == win->werase) { 110 int endcol, xcol, i, c; 111 112 endcol = win->x_col; 113 xcol = endcol - 1; 114 while (xcol >= 0) { 115 c = readwin(win->x_win, win->x_line, xcol); 116 if (c != ' ') 117 break; 118 xcol--; 119 } 120 while (xcol >= 0) { 121 c = readwin(win->x_win, win->x_line, xcol); 122 if (c == ' ') 123 break; 124 xcol--; 125 } 126 wmove(win->x_win, win->x_line, xcol + 1); 127 for (i = xcol + 1; i < endcol; i++) 128 waddch(win->x_win, ' '); 129 wmove(win->x_win, win->x_line, xcol + 1); 130 getyx(win->x_win, win->x_line, win->x_col); 131 text++; 132 continue; 133 } 134 /* line kill */ 135 if (*text == win->kill) { 136 wmove(win->x_win, win->x_line, 0); 137 wclrtoeol(win->x_win); 138 getyx(win->x_win, win->x_line, win->x_col); 139 text++; 140 continue; 141 } 142 if (*text == '\f') { 143 if (win == &my_win) 144 wrefresh(curscr); 145 text++; 146 continue; 147 } 148 if (win->x_col == COLS-1) { 149 /* check for wraparound */ 150 xscroll(win, 0); 151 } 152 if (!isprint(*text) && *text != '\t') { 153 waddch(win->x_win, '^'); 154 getyx(win->x_win, win->x_line, win->x_col); 155 if (win->x_col == COLS-1) /* check for wraparound */ 156 xscroll(win, 0); 157 cch = (*text & 63) + 64; 158 waddch(win->x_win, cch); 159 } else 160 waddch(win->x_win, *text); 161 getyx(win->x_win, win->x_line, win->x_col); 162 text++; 163 } 164 wrefresh(win->x_win); 165 } 166 167 /* 168 * Read the character at the indicated position in win 169 */ 170 int 171 readwin(win, line, col) 172 WINDOW *win; 173 int line, col; 174 { 175 int oldline, oldcol; 176 register int c; 177 178 getyx(win, oldline, oldcol); 179 wmove(win, line, col); 180 c = winch(win); 181 wmove(win, oldline, oldcol); 182 return (c); 183 } 184 185 /* 186 * Scroll a window, blanking out the line following the current line 187 * so that the current position is obvious 188 */ 189 void 190 xscroll(win, flag) 191 register xwin_t *win; 192 int flag; 193 { 194 195 if (flag == -1) { 196 wmove(win->x_win, 0, 0); 197 win->x_line = 0; 198 win->x_col = 0; 199 return; 200 } 201 win->x_line = (win->x_line + 1) % win->x_nlines; 202 win->x_col = 0; 203 wmove(win->x_win, win->x_line, win->x_col); 204 wclrtoeol(win->x_win); 205 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 206 wclrtoeol(win->x_win); 207 wmove(win->x_win, win->x_line, win->x_col); 208 } 209