1 /* $OpenBSD: display.c,v 1.14 2004/03/02 21:04:42 tedu 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 static const char rcsid[] = "$OpenBSD: display.c,v 1.14 2004/03/02 21:04:42 tedu 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 int high_print = 0; 53 bool smooth_scroll = FALSE; 54 55 /* 56 * max HAS to be a function, it is called with 57 * a argument of the form --foo at least once. 58 */ 59 int 60 max(a,b) 61 int a, b; 62 { 63 64 return (a > b ? a : b); 65 } 66 67 /* 68 * Display some text on somebody's window, processing some control 69 * characters while we are at it. 70 */ 71 void 72 display(win, text, size) 73 xwin_t *win; 74 char *text; 75 int size; 76 { 77 int i; 78 char cch; 79 80 for (i = 0; i < size; i++) { 81 /* 82 * Since we do not use curses's input routines we must 83 * convert '\r' -> '\n' ourselves. 84 */ 85 if (*text == '\r') 86 *text = '\n'; 87 if (*text == '\n') { 88 xscroll(win, 0); 89 text++; 90 continue; 91 } 92 /* erase character */ 93 if (*text == win->cerase) { 94 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 95 getyx(win->x_win, win->x_line, win->x_col); 96 waddch(win->x_win, ' '); 97 wmove(win->x_win, win->x_line, win->x_col); 98 getyx(win->x_win, win->x_line, win->x_col); 99 text++; 100 continue; 101 } 102 /* 103 * On word erase search backwards until we find 104 * the beginning of a word or the beginning of 105 * the line. 106 */ 107 if (*text == win->werase) { 108 int endcol, xcol, i, c; 109 110 endcol = win->x_col; 111 xcol = endcol - 1; 112 while (xcol >= 0) { 113 c = readwin(win->x_win, win->x_line, xcol); 114 if (c != ' ') 115 break; 116 xcol--; 117 } 118 while (xcol >= 0) { 119 c = readwin(win->x_win, win->x_line, xcol); 120 if (c == ' ') 121 break; 122 xcol--; 123 } 124 wmove(win->x_win, win->x_line, xcol + 1); 125 for (i = xcol + 1; i < endcol; i++) 126 waddch(win->x_win, ' '); 127 wmove(win->x_win, win->x_line, xcol + 1); 128 getyx(win->x_win, win->x_line, win->x_col); 129 text++; 130 continue; 131 } 132 /* line kill */ 133 if (*text == win->kill) { 134 wmove(win->x_win, win->x_line, 0); 135 wclrtoeol(win->x_win); 136 getyx(win->x_win, win->x_line, win->x_col); 137 text++; 138 continue; 139 } 140 if (*text == '\f') { 141 if (win == &my_win) 142 wrefresh(curscr); 143 text++; 144 continue; 145 } 146 if (win->x_col == COLS-1) { 147 /* check for wraparound */ 148 xscroll(win, 0); 149 } 150 if (*text != '\t' && 151 ((!high_print && !isprint(*text)) || iscntrl(*text))) { 152 waddch(win->x_win, '^'); 153 getyx(win->x_win, win->x_line, win->x_col); 154 if (win->x_col == COLS-1) /* check for wraparound */ 155 xscroll(win, 0); 156 cch = (*text & 63) + 64; 157 waddch(win->x_win, cch); 158 } else 159 waddch(win->x_win, (unsigned char)(*text)); 160 getyx(win->x_win, win->x_line, win->x_col); 161 text++; 162 } 163 wrefresh(win->x_win); 164 } 165 166 /* 167 * Read the character at the indicated position in win 168 */ 169 int 170 readwin(win, line, col) 171 WINDOW *win; 172 int line, col; 173 { 174 int oldline, oldcol; 175 int c; 176 177 getyx(win, oldline, oldcol); 178 wmove(win, line, col); 179 c = winch(win); 180 wmove(win, oldline, oldcol); 181 return (c); 182 } 183 184 /* 185 * Scroll a window, blanking out the line following the current line 186 * so that the current position is obvious 187 */ 188 void 189 xscroll(win, flag) 190 xwin_t *win; 191 int flag; 192 { 193 194 if (flag == -1) { 195 wmove(win->x_win, 0, 0); 196 win->x_line = 0; 197 win->x_col = 0; 198 return; 199 } 200 win->x_col = 0; 201 if (smooth_scroll) { 202 if (++win->x_line == win->x_nlines) { 203 --win->x_line; 204 scroll(win->x_win); 205 } 206 } else { 207 win->x_line = (win->x_line + 1) % win->x_nlines; 208 wmove(win->x_win, win->x_line, win->x_col); 209 wclrtoeol(win->x_win); 210 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, 211 win->x_col); 212 wclrtoeol(win->x_win); 213 } 214 wmove(win->x_win, win->x_line, win->x_col); 215 } 216