blob: 69b785ec6200d3f788a814962d86a268fa95c950
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 | |
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" |
14 | //usage: "\n -a Display decimal/octal/hex values of the keys" |
15 | //usage: "\n -k Display interpreted keycodes (default)" |
16 | //usage: "\n -s Display raw scan-codes" |
17 | |
18 | #include "libbb.h" |
19 | #include <linux/kd.h> |
20 | |
21 | |
22 | struct globals { |
23 | int kbmode; |
24 | struct termios tio, tio0; |
25 | }; |
26 | #define G (*ptr_to_globals) |
27 | #define kbmode (G.kbmode) |
28 | #define tio (G.tio) |
29 | #define tio0 (G.tio0) |
30 | #define INIT_G() do { \ |
31 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
32 | } while (0) |
33 | |
34 | |
35 | // set raw tty mode |
36 | // also used by microcom |
37 | // libbb candidates? |
38 | static void xget1(struct termios *t, struct termios *oldt) |
39 | { |
40 | tcgetattr(STDIN_FILENO, oldt); |
41 | *t = *oldt; |
42 | cfmakeraw(t); |
43 | } |
44 | |
45 | static void xset1(struct termios *t) |
46 | { |
47 | int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t); |
48 | if (ret) { |
49 | bb_perror_msg("can't tcsetattr for stdin"); |
50 | } |
51 | } |
52 | |
53 | int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
54 | int showkey_main(int argc UNUSED_PARAM, char **argv) |
55 | { |
56 | enum { |
57 | OPT_a = (1<<0), // display the decimal/octal/hex values of the keys |
58 | OPT_k = (1<<1), // display only the interpreted keycodes (default) |
59 | OPT_s = (1<<2), // display only the raw scan-codes |
60 | }; |
61 | |
62 | INIT_G(); |
63 | |
64 | // FIXME: aks are all mutually exclusive |
65 | getopt32(argv, "aks"); |
66 | |
67 | // prepare for raw mode |
68 | xget1(&tio, &tio0); |
69 | // put stdin in raw mode |
70 | xset1(&tio); |
71 | |
72 | #define press_keys "Press any keys, program terminates %s:\r\n\n" |
73 | |
74 | if (option_mask32 & OPT_a) { |
75 | // just read stdin char by char |
76 | unsigned char c; |
77 | |
78 | printf(press_keys, "on EOF (ctrl-D)"); |
79 | |
80 | // read and show byte values |
81 | while (1 == read(STDIN_FILENO, &c, 1)) { |
82 | printf("%3u 0%03o 0x%02x\r\n", c, c, c); |
83 | if (04 /*CTRL-D*/ == c) |
84 | break; |
85 | } |
86 | |
87 | } else { |
88 | // we assume a PC keyboard |
89 | xioctl(STDIN_FILENO, KDGKBMODE, &kbmode); |
90 | printf("Keyboard mode was %s.\r\n\n", |
91 | kbmode == K_RAW ? "RAW" : |
92 | (kbmode == K_XLATE ? "XLATE" : |
93 | (kbmode == K_MEDIUMRAW ? "MEDIUMRAW" : |
94 | (kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN"))) |
95 | ); |
96 | |
97 | // set raw keyboard mode |
98 | xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW)); |
99 | |
100 | // we should exit on any signal; signals should interrupt read |
101 | bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo); |
102 | |
103 | // inform user that program ends after time of inactivity |
104 | printf(press_keys, "10s after last keypress"); |
105 | |
106 | // read and show scancodes |
107 | while (!bb_got_signal) { |
108 | char buf[18]; |
109 | int i, n; |
110 | |
111 | // setup 10s watchdog |
112 | alarm(10); |
113 | |
114 | // read scancodes |
115 | n = read(STDIN_FILENO, buf, sizeof(buf)); |
116 | i = 0; |
117 | while (i < n) { |
118 | if (option_mask32 & OPT_s) { |
119 | // show raw scancodes |
120 | printf("0x%02x ", buf[i++]); |
121 | } else { |
122 | // show interpreted scancodes (default) |
123 | char c = buf[i]; |
124 | int kc; |
125 | if (i+2 < n |
126 | && (c & 0x7f) == 0 |
127 | && (buf[i+1] & 0x80) != 0 |
128 | && (buf[i+2] & 0x80) != 0 |
129 | ) { |
130 | kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f); |
131 | i += 3; |
132 | } else { |
133 | kc = (c & 0x7f); |
134 | i++; |
135 | } |
136 | printf("keycode %3u %s", kc, (c & 0x80) ? "release" : "press"); |
137 | } |
138 | } |
139 | puts("\r"); |
140 | } |
141 | |
142 | // restore keyboard mode |
143 | xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode); |
144 | } |
145 | |
146 | // restore console settings |
147 | xset1(&tio0); |
148 | |
149 | return EXIT_SUCCESS; |
150 | } |
151 |