display.c revision 1.4
1 /* $NetBSD: display.c,v 1.4 1997/04/21 16:15:32 is 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 39 #endif 40 static char rcsid[] = "$NetBSD: display.c,v 1.4 1997/04/21 16:15:32 is Exp $"; 41 #endif /* not lint */ 42 43 /* 44 * The window 'manager', initializes curses and handles the actual 45 * displaying of text 46 */ 47 #include "talk.h" 48 49 xwin_t my_win; 50 xwin_t his_win; 51 WINDOW *line_win; 52 53 int curses_initialized = 0; 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 max(a,b) 60 int a, b; 61 { 62 63 return (a > b ? a : b); 64 } 65 66 /* 67 * Display some text on somebody's window, processing some control 68 * characters while we are at it. 69 */ 70 display(win, text, size) 71 register xwin_t *win; 72 register char *text; 73 int size; 74 { 75 register int i; 76 char cch; 77 78 for (i = 0; i < size; i++) { 79 if (*text == '\n') { 80 xscroll(win, 0); 81 text++; 82 continue; 83 } 84 /* erase character */ 85 if (*text == win->cerase) { 86 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 87 getyx(win->x_win, win->x_line, win->x_col); 88 waddch(win->x_win, ' '); 89 wmove(win->x_win, win->x_line, win->x_col); 90 getyx(win->x_win, win->x_line, win->x_col); 91 text++; 92 continue; 93 } 94 /* 95 * On word erase search backwards until we find 96 * the beginning of a word or the beginning of 97 * the line. 98 */ 99 if (*text == win->werase) { 100 int endcol, xcol, i, c; 101 102 endcol = win->x_col; 103 xcol = endcol - 1; 104 while (xcol >= 0) { 105 c = readwin(win->x_win, win->x_line, xcol); 106 if (c != ' ') 107 break; 108 xcol--; 109 } 110 while (xcol >= 0) { 111 c = readwin(win->x_win, win->x_line, xcol); 112 if (c == ' ') 113 break; 114 xcol--; 115 } 116 wmove(win->x_win, win->x_line, xcol + 1); 117 for (i = xcol + 1; i < endcol; i++) 118 waddch(win->x_win, ' '); 119 wmove(win->x_win, win->x_line, xcol + 1); 120 getyx(win->x_win, win->x_line, win->x_col); 121 text++; 122 continue; 123 } 124 /* line kill */ 125 if (*text == win->kill) { 126 wmove(win->x_win, win->x_line, 0); 127 wclrtoeol(win->x_win); 128 getyx(win->x_win, win->x_line, win->x_col); 129 text++; 130 continue; 131 } 132 if (*text == '\f') { 133 if (win == &my_win) 134 wrefresh(curscr); 135 text++; 136 continue; 137 } 138 if (win->x_col == COLS-1) { 139 /* check for wraparound */ 140 xscroll(win, 0); 141 } 142 if ( !isprint((u_char)*text) && *text != '\t') { 143 waddch(win->x_win, '^'); 144 getyx(win->x_win, win->x_line, win->x_col); 145 if (win->x_col == COLS-1) /* check for wraparound */ 146 xscroll(win, 0); 147 cch = (*text & 63) + 64; 148 waddch(win->x_win, cch); 149 } else 150 waddch(win->x_win, *text); 151 getyx(win->x_win, win->x_line, win->x_col); 152 text++; 153 } 154 wrefresh(win->x_win); 155 } 156 157 /* 158 * Read the character at the indicated position in win 159 */ 160 readwin(win, line, col) 161 WINDOW *win; 162 { 163 int oldline, oldcol; 164 register int c; 165 166 getyx(win, oldline, oldcol); 167 wmove(win, line, col); 168 c = winch(win); 169 wmove(win, oldline, oldcol); 170 return (c); 171 } 172 173 /* 174 * Scroll a window, blanking out the line following the current line 175 * so that the current position is obvious 176 */ 177 xscroll(win, flag) 178 register xwin_t *win; 179 int flag; 180 { 181 182 if (flag == -1) { 183 wmove(win->x_win, 0, 0); 184 win->x_line = 0; 185 win->x_col = 0; 186 return; 187 } 188 win->x_line = (win->x_line + 1) % win->x_nlines; 189 win->x_col = 0; 190 wmove(win->x_win, win->x_line, win->x_col); 191 wclrtoeol(win->x_win); 192 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 193 wclrtoeol(win->x_win); 194 wmove(win->x_win, win->x_line, win->x_col); 195 } 196
Indexes created Sun Sep 21 20:09:37 GMT 2025