1 /* $OpenBSD: display.c,v 1.15 2009/10/27 23:59:44 deraadt 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 /* 34 * The window 'manager', initializes curses and handles the actual 35 * displaying of text 36 */ 37 #include "talk.h" 38 #include <ctype.h> 39 40 xwin_t my_win; 41 xwin_t his_win; 42 WINDOW *line_win; 43 44 int curses_initialized = 0; 45 int high_print = 0; 46 bool smooth_scroll = FALSE; 47 48 /* 49 * max HAS to be a function, it is called with 50 * a argument of the form --foo at least once. 51 */ 52 int 53 max(a,b) 54 int a, b; 55 { 56 57 return (a > b ? a : b); 58 } 59 60 /* 61 * Display some text on somebody's window, processing some control 62 * characters while we are at it. 63 */ 64 void 65 display(win, text, size) 66 xwin_t *win; 67 char *text; 68 int size; 69 { 70 int i; 71 char cch; 72 73 for (i = 0; i < size; i++) { 74 /* 75 * Since we do not use curses's input routines we must 76 * convert '\r' -> '\n' ourselves. 77 */ 78 if (*text == '\r') 79 *text = '\n'; 80 if (*text == '\n') { 81 xscroll(win, 0); 82 text++; 83 continue; 84 } 85 /* erase character */ 86 if (*text == win->cerase) { 87 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 88 getyx(win->x_win, win->x_line, win->x_col); 89 waddch(win->x_win, ' '); 90 wmove(win->x_win, win->x_line, win->x_col); 91 getyx(win->x_win, win->x_line, win->x_col); 92 text++; 93 continue; 94 } 95 /* 96 * On word erase search backwards until we find 97 * the beginning of a word or the beginning of 98 * the line. 99 */ 100 if (*text == win->werase) { 101 int endcol, xcol, i, c; 102 103 endcol = win->x_col; 104 xcol = endcol - 1; 105 while (xcol >= 0) { 106 c = readwin(win->x_win, win->x_line, xcol); 107 if (c != ' ') 108 break; 109 xcol--; 110 } 111 while (xcol >= 0) { 112 c = readwin(win->x_win, win->x_line, xcol); 113 if (c == ' ') 114 break; 115 xcol--; 116 } 117 wmove(win->x_win, win->x_line, xcol + 1); 118 for (i = xcol + 1; i < endcol; i++) 119 waddch(win->x_win, ' '); 120 wmove(win->x_win, win->x_line, xcol + 1); 121 getyx(win->x_win, win->x_line, win->x_col); 122 text++; 123 continue; 124 } 125 /* line kill */ 126 if (*text == win->kill) { 127 wmove(win->x_win, win->x_line, 0); 128 wclrtoeol(win->x_win); 129 getyx(win->x_win, win->x_line, win->x_col); 130 text++; 131 continue; 132 } 133 if (*text == '\f') { 134 if (win == &my_win) 135 wrefresh(curscr); 136 text++; 137 continue; 138 } 139 if (win->x_col == COLS-1) { 140 /* check for wraparound */ 141 xscroll(win, 0); 142 } 143 if (*text != '\t' && 144 ((!high_print && !isprint(*text)) || iscntrl(*text))) { 145 waddch(win->x_win, '^'); 146 getyx(win->x_win, win->x_line, win->x_col); 147 if (win->x_col == COLS-1) /* check for wraparound */ 148 xscroll(win, 0); 149 cch = (*text & 63) + 64; 150 waddch(win->x_win, cch); 151 } else 152 waddch(win->x_win, (unsigned char)(*text)); 153 getyx(win->x_win, win->x_line, win->x_col); 154 text++; 155 } 156 wrefresh(win->x_win); 157 } 158 159 /* 160 * Read the character at the indicated position in win 161 */ 162 int 163 readwin(win, line, col) 164 WINDOW *win; 165 int line, col; 166 { 167 int oldline, oldcol; 168 int c; 169 170 getyx(win, oldline, oldcol); 171 wmove(win, line, col); 172 c = winch(win); 173 wmove(win, oldline, oldcol); 174 return (c); 175 } 176 177 /* 178 * Scroll a window, blanking out the line following the current line 179 * so that the current position is obvious 180 */ 181 void 182 xscroll(win, flag) 183 xwin_t *win; 184 int flag; 185 { 186 187 if (flag == -1) { 188 wmove(win->x_win, 0, 0); 189 win->x_line = 0; 190 win->x_col = 0; 191 return; 192 } 193 win->x_col = 0; 194 if (smooth_scroll) { 195 if (++win->x_line == win->x_nlines) { 196 --win->x_line; 197 scroll(win->x_win); 198 } 199 } else { 200 win->x_line = (win->x_line + 1) % win->x_nlines; 201 wmove(win->x_win, win->x_line, win->x_col); 202 wclrtoeol(win->x_win); 203 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, 204 win->x_col); 205 wclrtoeol(win->x_win); 206 } 207 wmove(win->x_win, win->x_line, win->x_col); 208 } 209