173 lines
3.3 KiB
C
173 lines
3.3 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)display.c 1.1 94/10/31 SMI"; /* from UCB 1.2 83/04/23 */
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#endif
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/* The window 'manager', initializes curses and handles the actual
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* displaying of text
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*/
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#include "talk.h"
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xwin_t my_win;
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xwin_t his_win;
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WINDOW *line_win;
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int curses_initialized = 0;
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/* max HAS to be a function, it is called with
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* a argument of the form --foo at least once.
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*/
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max(a,b)
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int a, b;
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{
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if (a > b) {
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return(a);
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} else {
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return(b);
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}
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}
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/*
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* Display some text on somebody's window, processing some control
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* characters while we are at it.
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*/
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display(win, text, size)
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register xwin_t *win;
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register char *text;
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int size;
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{
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register int i;
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char cch;
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for (i = 0; i < size; i++) {
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if (*text == '\n') {
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xscroll(win, 0);
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text++;
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continue;
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}
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/* erase character */
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if (*text == win->cerase) {
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wmove(win->x_win, win->x_line, max(--win->x_col, 0));
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getyx(win->x_win, win->x_line, win->x_col);
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waddch(win->x_win, ' ');
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wmove(win->x_win, win->x_line, win->x_col);
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getyx(win->x_win, win->x_line, win->x_col);
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text++;
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continue;
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}
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/*
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* On word erase search backwards until we find
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* the beginning of a word or the beginning of
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* the line.
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*/
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if (*text == win->werase) {
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int endcol, xcol, i, c;
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endcol = win->x_col;
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xcol = endcol - 1;
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while (xcol >= 0) {
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c = readwin(win->x_win, win->x_line, xcol);
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if (c != ' ')
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break;
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xcol--;
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}
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while (xcol >= 0) {
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c = readwin(win->x_win, win->x_line, xcol);
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if (c == ' ')
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break;
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xcol--;
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}
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wmove(win->x_win, win->x_line, xcol + 1);
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for (i = xcol + 1; i < endcol; i++)
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waddch(win->x_win, ' ');
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wmove(win->x_win, win->x_line, xcol + 1);
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getyx(win->x_win, win->x_line, win->x_col);
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continue;
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}
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/* line kill */
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if (*text == win->kill) {
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wmove(win->x_win, win->x_line, 0);
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wclrtoeol(win->x_win);
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getyx(win->x_win, win->x_line, win->x_col);
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text++;
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continue;
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}
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if (*text == '\f') {
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if (win == &my_win)
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wrefresh(curscr);
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text++;
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continue;
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}
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if (win->x_col == COLS-1) {
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/* check for wraparound */
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xscroll(win, 0);
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}
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if (*text < ' ' && *text != '\t') {
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waddch(win->x_win, '^');
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getyx(win->x_win, win->x_line, win->x_col);
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if (win->x_col == COLS-1) {
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/* check for wraparound */
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xscroll(win, 0);
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}
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cch = (*text & 63) + 64;
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waddch(win->x_win, cch);
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} else {
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waddch(win->x_win, *text);
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}
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getyx(win->x_win, win->x_line, win->x_col);
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text++;
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}
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wrefresh(win->x_win);
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}
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/*
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* Read the character at the indicated position in win
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*/
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readwin(win, line, col)
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WINDOW *win;
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{
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int oldline, oldcol;
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register int c;
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getyx(win, oldline, oldcol);
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wmove(win, line, col);
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c = winch(win);
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wmove(win, oldline, oldcol);
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return(c);
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}
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/*
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* Scroll a window, blanking out the line following the current line
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* so that the current position is obvious
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*/
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xscroll(win, flag)
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register xwin_t *win;
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int flag;
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{
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if (flag == -1) {
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wmove(win->x_win, 0, 0);
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win->x_line = 0;
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win->x_col = 0;
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return;
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}
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win->x_line = (win->x_line + 1) % win->x_nlines;
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win->x_col = 0;
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wmove(win->x_win, win->x_line, win->x_col);
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wclrtoeol(win->x_win);
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wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col);
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wclrtoeol(win->x_win);
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wmove(win->x_win, win->x_line, win->x_col);
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}
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