display.c revision 1.1
1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char sccsid[] = "@(#)display.c 5.4 (Berkeley) 6/1/90"; 36 #endif /* not lint */ 37 38 /* 39 * The window 'manager', initializes curses and handles the actual 40 * displaying of text 41 */ 42 #include "talk.h" 43 44 xwin_t my_win; 45 xwin_t his_win; 46 WINDOW *line_win; 47 48 int curses_initialized = 0; 49 50 /* 51 * max HAS to be a function, it is called with 52 * a argument of the form --foo at least once. 53 */ 54 max(a,b) 55 int a, b; 56 { 57 58 return (a > b ? a : b); 59 } 60 61 /* 62 * Display some text on somebody's window, processing some control 63 * characters while we are at it. 64 */ 65 display(win, text, size) 66 register xwin_t *win; 67 register char *text; 68 int size; 69 { 70 register int i; 71 char cch; 72 73 for (i = 0; i < size; i++) { 74 if (*text == '\n') { 75 xscroll(win, 0); 76 text++; 77 continue; 78 } 79 /* erase character */ 80 if (*text == win->cerase) { 81 wmove(win->x_win, win->x_line, max(--win->x_col, 0)); 82 getyx(win->x_win, win->x_line, win->x_col); 83 waddch(win->x_win, ' '); 84 wmove(win->x_win, win->x_line, win->x_col); 85 getyx(win->x_win, win->x_line, win->x_col); 86 text++; 87 continue; 88 } 89 /* 90 * On word erase search backwards until we find 91 * the beginning of a word or the beginning of 92 * the line. 93 */ 94 if (*text == win->werase) { 95 int endcol, xcol, i, c; 96 97 endcol = win->x_col; 98 xcol = endcol - 1; 99 while (xcol >= 0) { 100 c = readwin(win->x_win, win->x_line, xcol); 101 if (c != ' ') 102 break; 103 xcol--; 104 } 105 while (xcol >= 0) { 106 c = readwin(win->x_win, win->x_line, xcol); 107 if (c == ' ') 108 break; 109 xcol--; 110 } 111 wmove(win->x_win, win->x_line, xcol + 1); 112 for (i = xcol + 1; i < endcol; i++) 113 waddch(win->x_win, ' '); 114 wmove(win->x_win, win->x_line, xcol + 1); 115 getyx(win->x_win, win->x_line, win->x_col); 116 continue; 117 } 118 /* line kill */ 119 if (*text == win->kill) { 120 wmove(win->x_win, win->x_line, 0); 121 wclrtoeol(win->x_win); 122 getyx(win->x_win, win->x_line, win->x_col); 123 text++; 124 continue; 125 } 126 if (*text == '\f') { 127 if (win == &my_win) 128 wrefresh(curscr); 129 text++; 130 continue; 131 } 132 if (win->x_col == COLS-1) { 133 /* check for wraparound */ 134 xscroll(win, 0); 135 } 136 if (*text < ' ' && *text != '\t') { 137 waddch(win->x_win, '^'); 138 getyx(win->x_win, win->x_line, win->x_col); 139 if (win->x_col == COLS-1) /* check for wraparound */ 140 xscroll(win, 0); 141 cch = (*text & 63) + 64; 142 waddch(win->x_win, cch); 143 } else 144 waddch(win->x_win, *text); 145 getyx(win->x_win, win->x_line, win->x_col); 146 text++; 147 } 148 wrefresh(win->x_win); 149 } 150 151 /* 152 * Read the character at the indicated position in win 153 */ 154 readwin(win, line, col) 155 WINDOW *win; 156 { 157 int oldline, oldcol; 158 register int c; 159 160 getyx(win, oldline, oldcol); 161 wmove(win, line, col); 162 c = winch(win); 163 wmove(win, oldline, oldcol); 164 return (c); 165 } 166 167 /* 168 * Scroll a window, blanking out the line following the current line 169 * so that the current position is obvious 170 */ 171 xscroll(win, flag) 172 register xwin_t *win; 173 int flag; 174 { 175 176 if (flag == -1) { 177 wmove(win->x_win, 0, 0); 178 win->x_line = 0; 179 win->x_col = 0; 180 return; 181 } 182 win->x_line = (win->x_line + 1) % win->x_nlines; 183 win->x_col = 0; 184 wmove(win->x_win, win->x_line, win->x_col); 185 wclrtoeol(win->x_win); 186 wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); 187 wclrtoeol(win->x_win); 188 wmove(win->x_win, win->x_line, win->x_col); 189 } 190
Indexes created Tue Sep 23 07:09:52 GMT 2025