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- /*
- * Copyright (c) 1983, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
- #endif /* not lint */
-
- /*
- * The window 'manager', initializes curses and handles the actual
- * displaying of text
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include "talk.h"
-
- xwin_t my_win;
- xwin_t his_win;
- WINDOW *line_win;
-
- int curses_initialized = 0;
-
- /*
- * max HAS to be a function, it is called with
- * a argument of the form --foo at least once.
- */
- max(a,b)
- int a, b;
- {
-
- return (a > b ? a : b);
- }
-
- /*
- * Display some text on somebody's window, processing some control
- * characters while we are at it.
- */
- display(win, text, size)
- register xwin_t *win;
- register char *text;
- int size;
- {
- register int i;
- char cch;
-
- for (i = 0; i < size; i++) {
- if (*text == '\n') {
- xscroll(win, 0);
- text++;
- continue;
- }
- /* erase character */
- if (*text == win->cerase) {
- wmove(win->x_win, win->x_line, max(--win->x_col, 0));
- getyx(win->x_win, win->x_line, win->x_col);
- waddch(win->x_win, ' ');
- wmove(win->x_win, win->x_line, win->x_col);
- getyx(win->x_win, win->x_line, win->x_col);
- text++;
- continue;
- }
- /*
- * On word erase search backwards until we find
- * the beginning of a word or the beginning of
- * the line.
- */
- if (*text == win->werase) {
- int endcol, xcol, i, c;
-
- endcol = win->x_col;
- xcol = endcol - 1;
- while (xcol >= 0) {
- c = readwin(win->x_win, win->x_line, xcol);
- if (c != ' ')
- break;
- xcol--;
- }
- while (xcol >= 0) {
- c = readwin(win->x_win, win->x_line, xcol);
- if (c == ' ')
- break;
- xcol--;
- }
- wmove(win->x_win, win->x_line, xcol + 1);
- for (i = xcol + 1; i < endcol; i++)
- waddch(win->x_win, ' ');
- wmove(win->x_win, win->x_line, xcol + 1);
- getyx(win->x_win, win->x_line, win->x_col);
- text++;
- continue;
- }
- /* line kill */
- if (*text == win->kill) {
- wmove(win->x_win, win->x_line, 0);
- wclrtoeol(win->x_win);
- getyx(win->x_win, win->x_line, win->x_col);
- text++;
- continue;
- }
- if (*text == '\f') {
- if (win == &my_win)
- wrefresh(curscr);
- text++;
- continue;
- }
- if (win->x_col == COLS-1) {
- /* check for wraparound */
- xscroll(win, 0);
- }
- if (*text < ' ' && *text != '\t') {
- waddch(win->x_win, '^');
- getyx(win->x_win, win->x_line, win->x_col);
- if (win->x_col == COLS-1) /* check for wraparound */
- xscroll(win, 0);
- cch = (*text & 63) + 64;
- waddch(win->x_win, cch);
- } else
- waddch(win->x_win, *text);
- getyx(win->x_win, win->x_line, win->x_col);
- text++;
- }
- wrefresh(win->x_win);
- }
-
- /*
- * Read the character at the indicated position in win
- */
- readwin(win, line, col)
- WINDOW *win;
- {
- int oldline, oldcol;
- register int c;
-
- getyx(win, oldline, oldcol);
- wmove(win, line, col);
- c = winch(win);
- wmove(win, oldline, oldcol);
- return (c);
- }
-
- /*
- * Scroll a window, blanking out the line following the current line
- * so that the current position is obvious
- */
- xscroll(win, flag)
- register xwin_t *win;
- int flag;
- {
-
- if (flag == -1) {
- wmove(win->x_win, 0, 0);
- win->x_line = 0;
- win->x_col = 0;
- return;
- }
- win->x_line = (win->x_line + 1) % win->x_nlines;
- win->x_col = 0;
- wmove(win->x_win, win->x_line, win->x_col);
- wclrtoeol(win->x_win);
- wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
- wclrtoeol(win->x_win);
- wmove(win->x_win, win->x_line, win->x_col);
- }
-