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 tarball for details.
14 // also used by microcom
16 static void xget1(int fd, struct termios *t, struct termios *oldt)
23 static int xset1(int fd, struct termios *tio, const char *device)
25 int ret = tcsetattr(fd, TCSAFLUSH, tio);
28 bb_perror_msg("can't tcsetattr for %s", device);
38 struct termios tio, tio0;
40 #define G (*ptr_to_globals)
41 #define kbmode (G.kbmode)
44 #define INIT_G() do { \
45 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
49 static void signal_handler(int signo)
51 // restore keyboard and console settings
52 xset1(STDIN_FILENO, &tio0, "stdin");
53 xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
55 exit(SIGALRM == signo);
58 int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
59 int showkey_main(int argc UNUSED_PARAM, char **argv)
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
67 // FIXME: aks are all mutually exclusive
68 getopt32(argv, "aks");
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"
81 // prepare for raw mode
82 xget1(STDIN_FILENO, &tio, &tio0);
83 // put stdin in raw mode
84 xset1(STDIN_FILENO, &tio, "stdin");
86 if (option_mask32 & OPT_a) {
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)
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));
100 // read and show scancodes
104 // setup 10s watchdog
107 n = read(STDIN_FILENO, buf, sizeof(buf));
111 // show raw scancodes ordered? ->
112 if (option_mask32 & OPT_s) {
113 printf("0x%02x ", buf[i++]);
114 // show interpreted scancodes (default) ? ->
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);
126 printf("keycode %3d %s", kc, (c & 0x80) ? "release" : "press");
134 signal_handler(SIGALRM);
136 // should never be here!