1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33
34__FBSDID("$FreeBSD$");
35
36#ifdef lint
37static const char sccsid[] = "@(#)keyboard.c	8.1 (Berkeley) 6/6/93";
38#endif
39
40#include <sys/select.h>
41#include <sys/time.h>
42
43#include <errno.h>
44#include <ctype.h>
45#include <stdlib.h>
46#include <termios.h>
47#include <unistd.h>
48
49#include "systat.h"
50#include "extern.h"
51
52static char line[80];
53static int keyboard_dispatch(int ch);
54
55int
56keyboard(void)
57{
58	int ch, n;
59	struct timeval last, intvl, now, tm;
60	fd_set rfds;
61
62	/* Set initial timings */
63	gettimeofday(&last, NULL);
64	intvl.tv_sec = delay / 1000000;
65	intvl.tv_usec = delay % 1000000;
66	for (;;) {
67		col = 0;
68		move(CMDLINE, 0);
69		for (;;) {
70			/* Determine interval to sleep */
71			(void)gettimeofday(&now, NULL);
72			tm.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec;
73			tm.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec;
74			while (tm.tv_usec < 0) {
75				tm.tv_usec += 1000000;
76				tm.tv_sec--;
77			}
78			while (tm.tv_usec >= 1000000) {
79				tm.tv_usec -= 1000000;
80				tm.tv_sec++;
81			}
82			if (tm.tv_sec < 0) {
83				/* We have to update screen immediately */
84				display();
85				gettimeofday(&last, NULL);
86				continue;
87			}
88
89			/* Prepare select  */
90			FD_ZERO(&rfds);
91			FD_SET(STDIN_FILENO, &rfds);
92			n = select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tm);
93
94			if (n > 0) {
95				/* Read event on stdin */
96				ch = getch();
97
98				if (keyboard_dispatch(ch) == 0) {
99					refresh();
100					continue;
101				}
102
103				line[col] = '\0';
104				command(line + 1);
105				/* Refresh delay */
106				intvl.tv_sec = delay / 1000000;
107				intvl.tv_usec = delay % 1000000;
108				refresh();
109				break;
110			}
111
112			if (n < 0 && errno != EINTR)
113				exit(1);
114
115			/* Timeout or signal. Call display another time */
116			display();
117			gettimeofday(&last, NULL);
118		}
119	}
120}
121
122static int
123keyboard_dispatch(int ch)
124{
125
126	if (ch == ERR) {
127		if (errno == EINTR)
128			return 0;
129		exit(1);
130	}
131	if (ch >= 'A' && ch <= 'Z')
132		ch += 'a' - 'A';
133	if (col == 0) {
134		if (ch == CTRL('l')) {
135			wrefresh(curscr);
136			return 0;
137		}
138		if (ch == CTRL('g')) {
139			status();
140			return 0;
141		}
142		if (ch != ':')
143			return 0;
144		move(CMDLINE, 0);
145		clrtoeol();
146	}
147	if (ch == erasechar() && col > 0) {
148		if (col == 1 && line[0] == ':')
149			return 0;
150		col--;
151		goto doerase;
152	}
153	if (ch == CTRL('w') && col > 0) {
154		while (--col >= 0 && isspace(line[col]))
155			;
156		col++;
157		while (--col >= 0 && !isspace(line[col]))
158			if (col == 0 && line[0] == ':')
159				return 1;
160		col++;
161		goto doerase;
162	}
163	if (ch == killchar() && col > 0) {
164		col = 0;
165		if (line[0] == ':')
166			col++;
167doerase:
168		move(CMDLINE, col);
169		clrtoeol();
170		return 0;
171	}
172	if (isprint(ch) || ch == ' ') {
173		line[col] = ch;
174		mvaddch(CMDLINE, col, ch);
175		col++;
176	}
177
178	if (col == 0 || (ch != '\r' && ch != '\n'))
179		return 0;
180
181	return 1;
182}
183