1 /* $OpenBSD: display.c,v 1.8 2000/12/31 00:24:51 hugh 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 1.8 2000/12/31 00:24:51 hugh 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 int high_print = 0; 57 58 /* 59 * max HAS to be a function, it is called with 60 * a argument of the form --foo at least once. 61 */ 62 int 63 max(a,b) 64 int a, b; 65 { 66 67 return (a > b ? a : b); 68 } 69 70 /* 71 * Display some text on somebody's window, processing some control 72 * characters while we are at it. 73 */ 74 void 75 display(win, text, size) 76 register xwin_t *win; 77 register char *text; 78 int size; 79 { 80 register int i; 81 char cch; 82 83 for (i = 0; i < size; i++) { 84 /* 85 * Since we do not use curses's input routines we must 86 * convert '\r' -> '\n' ourselves. 87 */ 88 if (*text == '\r') 89 *text = '\n'; 90 if (*text == '\n') { 91 xscroll(win, 0); 92 text++; 93 continue; 94 } 95 /* erase character */ 96 if (*text == win->cerase) { 97 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 98 getyx(win->x_win, win->x_line, win->x_col); 99 waddch(win->x_win, ' '); 100 wmove(win->x_win, win->x_line, win->x_col); 101 getyx(win->x_win, win->x_line, win->x_col); 102 text++; 103 continue; 104 } 105 /* 106 * On word erase search backwards until we find 107 * the beginning of a word or the beginning of 108 * the line. 109 */ 110 if (*text == win->werase) { 111 int endcol, xcol, i, c; 112 113 endcol = win->x_col; 114 xcol = endcol - 1; 115 while (xcol >= 0) { 116 c = readwin(win->x_win, win->x_line, xcol); 117 if (c != ' ') 118 break; 119 xcol--; 120 } 121 while (xcol >= 0) { 122 c = readwin(win->x_win, win->x_line, xcol); 123 if (c == ' ') 124 break; 125 xcol--; 126 } 127 wmove(win->x_win, win->x_line, xcol + 1); 128 for (i = xcol + 1; i < endcol; i++) 129 waddch(win->x_win, ' '); 130 wmove(win->x_win, win->x_line, xcol + 1); 131 getyx(win->x_win, win->x_line, win->x_col); 132 text++; 133 continue; 134 } 135 /* line kill */ 136 if (*text == win->kill) { 137 wmove(win->x_win, win->x_line, 0); 138 wclrtoeol(win->x_win); 139 getyx(win->x_win, win->x_line, win->x_col); 140 text++; 141 continue; 142 } 143 if (*text == '\f') { 144 if (win == &my_win) 145 wrefresh(curscr); 146 text++; 147 continue; 148 } 149 if (win->x_col == COLS-1) { 150 /* check for wraparound */ 151 xscroll(win, 0); 152 } 153 if (*text != '\t' && 154 ((!high_print && !isprint(*text)) || iscntrl(*text))) { 155 waddch(win->x_win, '^'); 156 getyx(win->x_win, win->x_line, win->x_col); 157 if (win->x_col == COLS-1) /* check for wraparound */ 158 xscroll(win, 0); 159 cch = (*text & 63) + 64; 160 waddch(win->x_win, cch); 161 } else 162 waddch(win->x_win, (unsigned char)(*text)); 163 getyx(win->x_win, win->x_line, win->x_col); 164 text++; 165 } 166 wrefresh(win->x_win); 167 } 168 169 /* 170 * Read the character at the indicated position in win 171 */ 172 int 173 readwin(win, line, col) 174 WINDOW *win; 175 int line, col; 176 { 177 int oldline, oldcol; 178 register int c; 179 180 getyx(win, oldline, oldcol); 181 wmove(win, line, col); 182 c = winch(win); 183 wmove(win, oldline, oldcol); 184 return (c); 185 } 186 187 /* 188 * Scroll a window, blanking out the line following the current line 189 * so that the current position is obvious 190 */ 191 void 192 xscroll(win, flag) 193 register xwin_t *win; 194 int flag; 195 { 196 197 if (flag == -1) { 198 wmove(win->x_win, 0, 0); 199 win->x_line = 0; 200 win->x_col = 0; 201 return; 202 } 203 win->x_line = (win->x_line + 1) % win->x_nlines; 204 win->x_col = 0; 205 wmove(win->x_win, win->x_line, win->x_col); 206 wclrtoeol(win->x_win); 207 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 208 wclrtoeol(win->x_win); 209 wmove(win->x_win, win->x_line, win->x_col); 210 } 211