/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#ifndef lint
static const char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
#endif
/*
* The window 'manager', initializes curses and handles the actual
* displaying of text
*/
#include <ctype.h>
#include <unistd.h>
#include <wctype.h>
#define _XOPEN_SOURCE_EXTENDED
#include <curses.h>
#include "talk.h"
void display(xwin_t *, wchar_t *);
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
* an argument of the form --foo at least once.
*/
int
max(int a, int b)
{
return (a > b ? a : b);
}
static cchar_t *
makecchar(wchar_t in)
{
static cchar_t cc;
wchar_t wc[2];
wc[0] = in;
wc[1] = L'\0';
if (setcchar(&cc, wc, A_NORMAL, 0, NULL) != OK)
p_error("settchar(3) failure");
return (&cc);
}
/*
* Display a symbol on somebody's window, processing some control
* characters while we are at it.
*/
void
display(xwin_t *win, wchar_t *wc)
{
/*
* Alas, can't use variables in C switch statement.
* Workaround these 3 cases with goto.
*/
if (*wc == win->kill)
goto kill;
else if (*wc == win->cerase)
goto cerase;
else if (*wc == win->werase)
goto werase;
switch (*wc) {
case L'\n':
case L'\r':
wadd_wch(win->x_win, makecchar(L'\n'));
getyx(win->x_win, win->x_line, win->x_col);
wrefresh(win->x_win);
return;
case 004:
if (win == &my_win) {
/* Ctrl-D clears the screen. */
werase(my_win.x_win);
getyx(my_win.x_win, my_win.x_line, my_win.x_col);
wrefresh(my_win.x_win);
werase(his_win.x_win);
getyx(his_win.x_win, his_win.x_line, his_win.x_col);
wrefresh(his_win.x_win);
}
return;
/* Erase character. */
case 010: /* BS */
case 0177: /* DEL */
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);
wrefresh(win->x_win);
return;
case 027: /* ^W */
werase:
{
/*
* On word erase search backwards until we find
* the beginning of a word or the beginning of
* the line.
*/
int endcol, xcol, 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 (int 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);
wrefresh(win->x_win);
return;
}
case 025: /* ^U */
kill:
wmove(win->x_win, win->x_line, 0);
wclrtoeol(win->x_win);
getyx(win->x_win, win->x_line, win->x_col);
wrefresh(win->x_win);
return;
case L'\f':
if (win == &my_win)
wrefresh(curscr);
return;
case L'\7':
write(STDOUT_FILENO, wc, sizeof(*wc));
return;
}
if (iswprint(*wc) || *wc == L'\t')
wadd_wch(win->x_win, makecchar(*wc));
else
beep();
getyx(win->x_win, win->x_line, win->x_col);
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);
}
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