1 /* vi: set sw=4 ts=4: */
3 * shows keys pressed. inspired by kbd package
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
10 //usage:#define showkey_trivial_usage
11 //usage: "[-a | -k | -s]"
12 //usage:#define showkey_full_usage "\n\n"
13 //usage: "Show keys pressed\n"
15 //usage: "\n -a Display decimal/octal/hex values of the keys"
16 //usage: "\n -k Display interpreted keycodes (default)"
17 //usage: "\n -s Display raw scan-codes"
25 struct termios tio, tio0;
27 #define G (*ptr_to_globals)
28 #define kbmode (G.kbmode)
31 #define INIT_G() do { \
32 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
37 // also used by microcom
39 static void xget1(struct termios *t, struct termios *oldt)
41 tcgetattr(STDIN_FILENO, oldt);
46 static void xset1(struct termios *t)
48 int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t);
50 bb_perror_msg("can't tcsetattr for stdin");
54 int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
55 int showkey_main(int argc UNUSED_PARAM, char **argv)
58 OPT_a = (1<<0), // display the decimal/octal/hex values of the keys
59 OPT_k = (1<<1), // display only the interpreted keycodes (default)
60 OPT_s = (1<<2), // display only the raw scan-codes
65 // FIXME: aks are all mutually exclusive
66 getopt32(argv, "aks");
68 // prepare for raw mode
70 // put stdin in raw mode
73 #define press_keys "Press any keys, program terminates %s:\r\n\n"
75 if (option_mask32 & OPT_a) {
76 // just read stdin char by char
79 printf(press_keys, "on EOF (ctrl-D)");
81 // read and show byte values
82 while (1 == read(STDIN_FILENO, &c, 1)) {
83 printf("%3u 0%03o 0x%02x\r\n", c, c, c);
84 if (04 /*CTRL-D*/ == c)
89 // we assume a PC keyboard
90 xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
91 printf("Keyboard mode was %s.\r\n\n",
92 kbmode == K_RAW ? "RAW" :
93 (kbmode == K_XLATE ? "XLATE" :
94 (kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
95 (kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN")))
98 // set raw keyboard mode
99 xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
101 // we should exit on any signal; signals should interrupt read
102 bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo);
104 // inform user that program ends after time of inactivity
105 printf(press_keys, "10s after last keypress");
107 // read and show scancodes
108 while (!bb_got_signal) {
112 // setup 10s watchdog
116 n = read(STDIN_FILENO, buf, sizeof(buf));
119 if (option_mask32 & OPT_s) {
120 // show raw scancodes
121 printf("0x%02x ", buf[i++]);
123 // show interpreted scancodes (default)
128 && (buf[i+1] & 0x80) != 0
129 && (buf[i+2] & 0x80) != 0
131 kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f);
137 printf("keycode %3u %s", kc, (c & 0x80) ? "release" : "press");
143 // restore keyboard mode
144 xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
147 // restore console settings