keyboard.c revision 226424 
1/*-
2 * Copyright (c) 1980, 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD: head/usr.bin/systat/keyboard.c 226424 2011-10-16 08:36:10Z ed $");
33
34#ifdef lint
35static const char sccsid[] = "@(#)keyboard.c	8.1 (Berkeley) 6/6/93";
36#endif
37
38#include <errno.h>
39#include <ctype.h>
40#include <signal.h>
41#include <stdlib.h>
42#include <termios.h>
43
44#include "systat.h"
45#include "extern.h"
46
47int
48keyboard(void)
49{
50	char line[80];
51	int ch, oldmask;
52
53	for (;;) {
54		col = 0;
55		move(CMDLINE, 0);
56		do {
57			refresh();
58			ch = getch();
59			if (ch == ERR) {
60				if (errno == EINTR)
61					continue;
62				exit(1);
63			}
64			if (ch >= 'A' && ch <= 'Z')
65				ch += 'a' - 'A';
66			if (col == 0) {
67#define	mask(s)	(1 << ((s) - 1))
68				if (ch == CTRL('l')) {
69					oldmask = sigblock(mask(SIGALRM));
70					wrefresh(curscr);
71					sigsetmask(oldmask);
72					continue;
73				}
74				if (ch == CTRL('g')) {
75					oldmask = sigblock(mask(SIGALRM));
76					status();
77					sigsetmask(oldmask);
78					continue;
79				}
80				if (ch != ':')
81					continue;
82				move(CMDLINE, 0);
83				clrtoeol();
84			}
85			if (ch == erasechar() && col > 0) {
86				if (col == 1 && line[0] == ':')
87					continue;
88				col--;
89				goto doerase;
90			}
91			if (ch == CTRL('w') && col > 0) {
92				while (--col >= 0 && isspace(line[col]))
93					;
94				col++;
95				while (--col >= 0 && !isspace(line[col]))
96					if (col == 0 && line[0] == ':')
97						break;
98				col++;
99				goto doerase;
100			}
101			if (ch == killchar() && col > 0) {
102				col = 0;
103				if (line[0] == ':')
104					col++;
105		doerase:
106				move(CMDLINE, col);
107				clrtoeol();
108				continue;
109			}
110			if (isprint(ch) || ch == ' ') {
111				line[col] = ch;
112				mvaddch(CMDLINE, col, ch);
113				col++;
114			}
115		} while (col == 0 || (ch != '\r' && ch != '\n'));
116		line[col] = '\0';
117		oldmask = sigblock(mask(SIGALRM));
118		command(line + 1);
119		sigsetmask(oldmask);
120	}
121	/*NOTREACHED*/
122}
123