Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
211 lines
4.9 KiB
C
211 lines
4.9 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
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#endif
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/*
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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 <ctype.h>
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#include <unistd.h>
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#include <wctype.h>
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#define _XOPEN_SOURCE_EXTENDED
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#include <curses.h>
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#include "talk.h"
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void display(xwin_t *, wchar_t *);
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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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/*
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* max HAS to be a function, it is called with
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* an argument of the form --foo at least once.
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*/
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int
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max(int a, int b)
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{
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return (a > b ? a : b);
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}
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static cchar_t *
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makecchar(wchar_t in)
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{
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static cchar_t cc;
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wchar_t wc[2];
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wc[0] = in;
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wc[1] = L'\0';
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if (setcchar(&cc, wc, A_NORMAL, 0, NULL) != OK)
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p_error("settchar(3) failure");
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return (&cc);
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}
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/*
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* Display a symbol 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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void
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display(xwin_t *win, wchar_t *wc)
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{
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/*
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* Alas, can't use variables in C switch statement.
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* Workaround these 3 cases with goto.
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*/
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if (*wc == win->kill)
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goto kill;
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else if (*wc == win->cerase)
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goto cerase;
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else if (*wc == win->werase)
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goto werase;
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switch (*wc) {
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case L'\n':
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case L'\r':
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wadd_wch(win->x_win, makecchar(L'\n'));
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getyx(win->x_win, win->x_line, win->x_col);
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wrefresh(win->x_win);
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return;
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case 004:
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if (win == &my_win) {
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/* Ctrl-D clears the screen. */
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werase(my_win.x_win);
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getyx(my_win.x_win, my_win.x_line, my_win.x_col);
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wrefresh(my_win.x_win);
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werase(his_win.x_win);
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getyx(his_win.x_win, his_win.x_line, his_win.x_col);
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wrefresh(his_win.x_win);
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}
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return;
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/* Erase character. */
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case 010: /* BS */
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case 0177: /* DEL */
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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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wrefresh(win->x_win);
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return;
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case 027: /* ^W */
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werase:
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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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int endcol, xcol, 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 (int 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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wrefresh(win->x_win);
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return;
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}
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case 025: /* ^U */
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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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wrefresh(win->x_win);
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return;
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case L'\f':
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if (win == &my_win)
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wrefresh(curscr);
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return;
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case L'\7':
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write(STDOUT_FILENO, wc, sizeof(*wc));
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return;
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}
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if (iswprint(*wc) || *wc == L'\t')
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wadd_wch(win->x_win, makecchar(*wc));
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else
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beep();
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getyx(win->x_win, win->x_line, win->x_col);
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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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int
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readwin(WINDOW *win, int line, int col)
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{
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int oldline, oldcol;
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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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