blob: c2447b88703d9d771541fc3593d0268348a68735
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 source tree. |
8 | */ |
9 | //config:config SHOWKEY |
10 | //config: bool "showkey" |
11 | //config: default y |
12 | //config: select PLATFORM_LINUX |
13 | //config: help |
14 | //config: Shows keys pressed. |
15 | |
16 | //applet:IF_SHOWKEY(APPLET(showkey, BB_DIR_USR_BIN, BB_SUID_DROP)) |
17 | |
18 | //kbuild:lib-$(CONFIG_SHOWKEY) += showkey.o |
19 | |
20 | //usage:#define showkey_trivial_usage |
21 | //usage: "[-a | -k | -s]" |
22 | //usage:#define showkey_full_usage "\n\n" |
23 | //usage: "Show keys pressed\n" |
24 | //usage: "\n -a Display decimal/octal/hex values of the keys" |
25 | //usage: "\n -k Display interpreted keycodes (default)" |
26 | //usage: "\n -s Display raw scan-codes" |
27 | |
28 | #include "libbb.h" |
29 | #include <linux/kd.h> |
30 | |
31 | |
32 | struct globals { |
33 | int kbmode; |
34 | struct termios tio, tio0; |
35 | }; |
36 | #define G (*ptr_to_globals) |
37 | #define kbmode (G.kbmode) |
38 | #define tio (G.tio) |
39 | #define tio0 (G.tio0) |
40 | #define INIT_G() do { \ |
41 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
42 | } while (0) |
43 | |
44 | |
45 | // set raw tty mode |
46 | // also used by microcom |
47 | // libbb candidates? |
48 | static void xget1(struct termios *t, struct termios *oldt) |
49 | { |
50 | tcgetattr(STDIN_FILENO, oldt); |
51 | *t = *oldt; |
52 | cfmakeraw(t); |
53 | } |
54 | |
55 | static void xset1(struct termios *t) |
56 | { |
57 | int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t); |
58 | if (ret) { |
59 | bb_perror_msg("can't tcsetattr for stdin"); |
60 | } |
61 | } |
62 | |
63 | int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
64 | int showkey_main(int argc UNUSED_PARAM, char **argv) |
65 | { |
66 | enum { |
67 | OPT_a = (1<<0), // display the decimal/octal/hex values of the keys |
68 | OPT_k = (1<<1), // display only the interpreted keycodes (default) |
69 | OPT_s = (1<<2), // display only the raw scan-codes |
70 | }; |
71 | |
72 | INIT_G(); |
73 | |
74 | // FIXME: aks are all mutually exclusive |
75 | getopt32(argv, "aks"); |
76 | |
77 | // prepare for raw mode |
78 | xget1(&tio, &tio0); |
79 | // put stdin in raw mode |
80 | xset1(&tio); |
81 | |
82 | #define press_keys "Press any keys, program terminates %s:\r\n\n" |
83 | |
84 | if (option_mask32 & OPT_a) { |
85 | // just read stdin char by char |
86 | unsigned char c; |
87 | |
88 | printf(press_keys, "on EOF (ctrl-D)"); |
89 | |
90 | // read and show byte values |
91 | while (1 == read(STDIN_FILENO, &c, 1)) { |
92 | printf("%3u 0%03o 0x%02x\r\n", c, c, c); |
93 | if (04 /*CTRL-D*/ == c) |
94 | break; |
95 | } |
96 | } else { |
97 | // we assume a PC keyboard |
98 | xioctl(STDIN_FILENO, KDGKBMODE, &kbmode); |
99 | printf("Keyboard mode was %s.\r\n\n", |
100 | kbmode == K_RAW ? "RAW" : |
101 | (kbmode == K_XLATE ? "XLATE" : |
102 | (kbmode == K_MEDIUMRAW ? "MEDIUMRAW" : |
103 | (kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN"))) |
104 | ); |
105 | |
106 | // set raw keyboard mode |
107 | xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW)); |
108 | |
109 | // we should exit on any signal; signals should interrupt read |
110 | bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo); |
111 | |
112 | // inform user that program ends after time of inactivity |
113 | printf(press_keys, "10s after last keypress"); |
114 | |
115 | // read and show scancodes |
116 | while (!bb_got_signal) { |
117 | char buf[18]; |
118 | int i, n; |
119 | |
120 | // setup 10s watchdog |
121 | alarm(10); |
122 | |
123 | // read scancodes |
124 | n = read(STDIN_FILENO, buf, sizeof(buf)); |
125 | i = 0; |
126 | while (i < n) { |
127 | if (option_mask32 & OPT_s) { |
128 | // show raw scancodes |
129 | printf("0x%02x ", buf[i++]); |
130 | } else { |
131 | // show interpreted scancodes (default) |
132 | char c = buf[i]; |
133 | int kc; |
134 | if (i+2 < n |
135 | && (c & 0x7f) == 0 |
136 | && (buf[i+1] & 0x80) != 0 |
137 | && (buf[i+2] & 0x80) != 0 |
138 | ) { |
139 | kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f); |
140 | i += 3; |
141 | } else { |
142 | kc = (c & 0x7f); |
143 | i++; |
144 | } |
145 | printf("keycode %3u %s", kc, (c & 0x80) ? "release" : "press"); |
146 | } |
147 | } |
148 | puts("\r"); |
149 | } |
150 | |
151 | // restore keyboard mode |
152 | xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode); |
153 | } |
154 | |
155 | // restore console settings |
156 | xset1(&tio0); |
157 | |
158 | return EXIT_SUCCESS; |
159 | } |
160 |