busybox/console-tools/showkey.c

/* vi: set sw=4 ts=4: */
/*
 * shows keys pressed. inspired by kbd package
 *
 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
 *
 * Licensed under GPLv2, see file LICENSE in this tarball for details.
 */

#include "libbb.h"
#include <linux/kd.h>

// set raw tty mode
// also used by microcom
// libbb candidates?
static void xget1(int fd, struct termios *t, struct termios *oldt)
{
	tcgetattr(fd, oldt);
	*t = *oldt;
	cfmakeraw(t);
}

static int xset1(int fd, struct termios *tio, const char *device)
{
	int ret = tcsetattr(fd, TCSAFLUSH, tio);

	if (ret) {
		bb_perror_msg("can't tcsetattr for %s", device);
	}
	return ret;
}

/*
 * GLOBALS
 */
struct globals {
	int kbmode;
	struct termios tio, tio0;
};
#define G (*ptr_to_globals)
#define kbmode	(G.kbmode)
#define tio	(G.tio)
#define tio0	(G.tio0)
#define INIT_G() do { \
	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)


static void signal_handler(int signo)
{
	// restore keyboard and console settings
	xset1(STDIN_FILENO, &tio0, "stdin");
	xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
	// alarmed? -> exit 0
	exit(SIGALRM == signo);
}

int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int showkey_main(int argc UNUSED_PARAM, char **argv)
{
	enum {
		OPT_a = (1<<0),	// display the decimal/octal/hex values of the keys
		OPT_k = (1<<1),	// display only the interpreted keycodes (default)
		OPT_s = (1<<2),	// display only the raw scan-codes
	};

	// FIXME: aks are all mutually exclusive
	getopt32(argv, "aks");

	INIT_G();

	// get keyboard settings
	xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
	printf("kb mode was %s\n\nPress any keys. Program terminates %s\n\n",
		kbmode == K_RAW ? "RAW" :
			(kbmode == K_XLATE ? "XLATE" :
				(kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
					(kbmode == K_UNICODE ? "UNICODE" : "?UNKNOWN?")))
		, (option_mask32 & OPT_a) ? "when CTRL+D pressed" : "10s after last keypress"
	);
	// prepare for raw mode
	xget1(STDIN_FILENO, &tio, &tio0);
	// put stdin in raw mode
	xset1(STDIN_FILENO, &tio, "stdin");

	if (option_mask32 & OPT_a) {
		char c;
		// just read stdin char by char
		while (1 == safe_read(STDIN_FILENO, &c, 1)) {
			printf("%3d 0%03o 0x%02x\r\n", c, c, c);
			if (04 /*CTRL-D*/ == c)
				break;
		}
	} else {
		// we should exit on any signal
		bb_signals(BB_FATAL_SIGS, signal_handler);
		// set raw keyboard mode
		xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));

		// read and show scancodes
		while (1) {
			char buf[18];
			int i, n;
			// setup 10s watchdog
			alarm(10);
			// read scancodes
			n = read(STDIN_FILENO, buf, sizeof(buf));
			i = 0;
			while (i < n) {
				char c = buf[i];
				// show raw scancodes ordered? ->
				if (option_mask32 & OPT_s) {
					printf("0x%02x ", buf[i++]);
				// show interpreted scancodes (default) ? ->
				} else {
					int kc;
					if (i+2 < n && (c & 0x7f) == 0
						&& (buf[i+1] & 0x80) != 0
						&& (buf[i+2] & 0x80) != 0) {
						kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f);
						i += 3;
					} else {
						kc = (c & 0x7f);
						i++;
					}
					printf("keycode %3d %s", kc, (c & 0x80) ? "release" : "press");
				}
			}
			puts("\r");
		}
	}

	// cleanup
	signal_handler(SIGALRM);

	// should never be here!
	return EXIT_SUCCESS;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* shows keys pressed. inspired by kbd package
4	*
5	* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
6	*
7	* Licensed under GPLv2, see file LICENSE in this tarball for details.
8	*/
9
10	#include "libbb.h"
11	#include <linux/kd.h>
12
13	// set raw tty mode
14	// also used by microcom
15	// libbb candidates?
16	static void xget1(int fd, struct termios t, struct termios oldt)
17	{
18	tcgetattr(fd, oldt);
19	t = oldt;
20	cfmakeraw(t);
21	}
22
23	static int xset1(int fd, struct termios tio, const char device)
24	{
25	int ret = tcsetattr(fd, TCSAFLUSH, tio);
26
27	if (ret) {
28	bb_perror_msg("can't tcsetattr for %s", device);
29	}
30	return ret;
31	}
32
33	/*
34	* GLOBALS
35	*/
36	struct globals {
37	int kbmode;
38	struct termios tio, tio0;
39	};
40	#define G (*ptr_to_globals)
41	#define kbmode (G.kbmode)
42	#define tio (G.tio)
43	#define tio0 (G.tio0)
44	#define INIT_G() do { \
45	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
46	} while (0)
47
48
49	static void signal_handler(int signo)
50	{
51	// restore keyboard and console settings
52	xset1(STDIN_FILENO, &tio0, "stdin");
53	xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
54	// alarmed? -> exit 0
55	exit(SIGALRM == signo);
56	}
57
58	int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
59	int showkey_main(int argc UNUSED_PARAM, char **argv)
60	{
61	enum {
62	OPT_a = (1<<0), // display the decimal/octal/hex values of the keys
63	OPT_k = (1<<1), // display only the interpreted keycodes (default)
64	OPT_s = (1<<2), // display only the raw scan-codes
65	};
66
67	// FIXME: aks are all mutually exclusive
68	getopt32(argv, "aks");
69
70	INIT_G();
71
72	// get keyboard settings
73	xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
74	printf("kb mode was %s\n\nPress any keys. Program terminates %s\n\n",
75	kbmode == K_RAW ? "RAW" :
76	(kbmode == K_XLATE ? "XLATE" :
77	(kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
78	(kbmode == K_UNICODE ? "UNICODE" : "?UNKNOWN?")))
79	, (option_mask32 & OPT_a) ? "when CTRL+D pressed" : "10s after last keypress"
80	);
81	// prepare for raw mode
82	xget1(STDIN_FILENO, &tio, &tio0);
83	// put stdin in raw mode
84	xset1(STDIN_FILENO, &tio, "stdin");
85
86	if (option_mask32 & OPT_a) {
87	char c;
88	// just read stdin char by char
89	while (1 == safe_read(STDIN_FILENO, &c, 1)) {
90	printf("%3d 0%03o 0x%02x\r\n", c, c, c);
91	if (04 /CTRL-D/ == c)
92	break;
93	}
94	} else {
95	// we should exit on any signal
96	bb_signals(BB_FATAL_SIGS, signal_handler);
97	// set raw keyboard mode
98	xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
99
100	// read and show scancodes
101	while (1) {
102	char buf[18];
103	int i, n;
104	// setup 10s watchdog
105	alarm(10);
106	// read scancodes
107	n = read(STDIN_FILENO, buf, sizeof(buf));
108	i = 0;
109	while (i < n) {
110	char c = buf[i];
111	// show raw scancodes ordered? ->
112	if (option_mask32 & OPT_s) {
113	printf("0x%02x ", buf[i++]);
114	// show interpreted scancodes (default) ? ->
115	} else {
116	int kc;
117	if (i+2 < n && (c & 0x7f) == 0
118	&& (buf[i+1] & 0x80) != 0
119	&& (buf[i+2] & 0x80) != 0) {
120	kc = ((buf[i+1] & 0x7f) << 7) \| (buf[i+2] & 0x7f);
121	i += 3;
122	} else {
123	kc = (c & 0x7f);
124	i++;
125	}
126	printf("keycode %3d %s", kc, (c & 0x80) ? "release" : "press");
127	}
128	}
129	puts("\r");
130	}
131	}
132
133	// cleanup
134	signal_handler(SIGALRM);
135
136	// should never be here!
137	return EXIT_SUCCESS;
138	}