display.c revision 1.5
1 /* $NetBSD: display.c,v 1.5 1997/10/20 00:23:17 lukem 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 __RCSID("$NetBSD: display.c,v 1.5 1997/10/20 00:23:17 lukem 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 xwin_t *win; 76 char *text; 77 int size; 78 { 79 int i; 80 char cch; 81 82 for (i = 0; i < size; i++) { 83 if (*text == '\n') { 84 xscroll(win, 0); 85 text++; 86 continue; 87 } 88 /* erase character */ 89 if (*text == win->cerase) { 90 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 91 getyx(win->x_win, win->x_line, win->x_col); 92 waddch(win->x_win, ' '); 93 wmove(win->x_win, win->x_line, win->x_col); 94 getyx(win->x_win, win->x_line, win->x_col); 95 text++; 96 continue; 97 } 98 /* 99 * On word erase search backwards until we find 100 * the beginning of a word or the beginning of 101 * the line. 102 */ 103 if (*text == win->werase) { 104 int endcol, xcol, i, c; 105 106 endcol = win->x_col; 107 xcol = endcol - 1; 108 while (xcol >= 0) { 109 c = readwin(win->x_win, win->x_line, xcol); 110 if (c != ' ') 111 break; 112 xcol--; 113 } 114 while (xcol >= 0) { 115 c = readwin(win->x_win, win->x_line, xcol); 116 if (c == ' ') 117 break; 118 xcol--; 119 } 120 wmove(win->x_win, win->x_line, xcol + 1); 121 for (i = xcol + 1; i < endcol; i++) 122 waddch(win->x_win, ' '); 123 wmove(win->x_win, win->x_line, xcol + 1); 124 getyx(win->x_win, win->x_line, win->x_col); 125 text++; 126 continue; 127 } 128 /* line kill */ 129 if (*text == win->kill) { 130 wmove(win->x_win, win->x_line, 0); 131 wclrtoeol(win->x_win); 132 getyx(win->x_win, win->x_line, win->x_col); 133 text++; 134 continue; 135 } 136 if (*text == '\f') { 137 if (win == &my_win) 138 wrefresh(curscr); 139 text++; 140 continue; 141 } 142 if (win->x_col == COLS-1) { 143 /* check for wraparound */ 144 xscroll(win, 0); 145 } 146 if ( !isprint((u_char)*text) && *text != '\t') { 147 waddch(win->x_win, '^'); 148 getyx(win->x_win, win->x_line, win->x_col); 149 if (win->x_col == COLS-1) /* check for wraparound */ 150 xscroll(win, 0); 151 cch = (*text & 63) + 64; 152 waddch(win->x_win, cch); 153 } else 154 waddch(win->x_win, *text); 155 getyx(win->x_win, win->x_line, win->x_col); 156 text++; 157 } 158 wrefresh(win->x_win); 159 } 160 161 /* 162 * Read the character at the indicated position in win 163 */ 164 int 165 readwin(win, line, col) 166 WINDOW *win; 167 int line, col; 168 { 169 int oldline, oldcol; 170 int c; 171 172 getyx(win, oldline, oldcol); 173 wmove(win, line, col); 174 c = winch(win); 175 wmove(win, oldline, oldcol); 176 return (c); 177 } 178 179 /* 180 * Scroll a window, blanking out the line following the current line 181 * so that the current position is obvious 182 */ 183 void 184 xscroll(win, flag) 185 xwin_t *win; 186 int flag; 187 { 188 189 if (flag == -1) { 190 wmove(win->x_win, 0, 0); 191 win->x_line = 0; 192 win->x_col = 0; 193 return; 194 } 195 win->x_line = (win->x_line + 1) % win->x_nlines; 196 win->x_col = 0; 197 wmove(win->x_win, win->x_line, win->x_col); 198 wclrtoeol(win->x_win); 199 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 200 wclrtoeol(win->x_win); 201 wmove(win->x_win, win->x_line, win->x_col); 202 } 203
Indexes created Tue Sep 23 07:09:52 GMT 2025