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/* $OpenBSD: display.c,v 1.18 2016/02/01 07:29:25 mestre Exp $ */
/* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $ */
/*
* 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. 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.
*/
/*
* The window 'manager', initializes curses and handles the actual
* displaying of text
*/
#include <ctype.h>
#include "talk.h"
xwin_t my_win;
xwin_t his_win;
WINDOW *line_win;
int curses_initialized;
int high_print;
bool smooth_scroll;
/*
* max HAS to be a function, it is called with
* an argument of the form --foo at least once.
*/
int
max(int a, int b)
{
return (a > b ? a : b);
}
/*
* Display some text on somebody's window, processing some control
* characters while we are at it.
*/
void
display(xwin_t *win, char *text, int size)
{
int i;
char cch;
for (i = 0; i < size; i++) {
/*
* Since we do not use curses's input routines we must
* convert '\r' -> '\n' ourselves.
*/
if (*text == '\r')
*text = '\n';
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 != '\t' &&
((!high_print && !isprint((unsigned char)*text)) ||
iscntrl((unsigned char)*text))) {
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, (unsigned char)(*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
*/
int
readwin(WINDOW *win, int line, int col)
{
int oldline, oldcol;
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
*/
void
xscroll(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_col = 0;
if (smooth_scroll) {
if (++win->x_line == win->x_nlines) {
--win->x_line;
scroll(win->x_win);
}
} else {
win->x_line = (win->x_line + 1) % win->x_nlines;
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);
}
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