[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * shows keys pressed. inspired by kbd package
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| 4 | *
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| 5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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| 6 | *
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| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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[3232] | 10 | //usage:#define showkey_trivial_usage
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| 11 | //usage: "[-a | -k | -s]"
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| 12 | //usage:#define showkey_full_usage "\n\n"
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| 13 | //usage: "Show keys pressed\n"
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| 14 | //usage: "\n -a Display decimal/octal/hex values of the keys"
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| 15 | //usage: "\n -k Display interpreted keycodes (default)"
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| 16 | //usage: "\n -s Display raw scan-codes"
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| 17 |
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[2725] | 18 | #include "libbb.h"
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| 19 | #include <linux/kd.h>
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| 20 |
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| 21 |
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| 22 | struct globals {
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| 23 | int kbmode;
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| 24 | struct termios tio, tio0;
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| 25 | };
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| 26 | #define G (*ptr_to_globals)
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| 27 | #define kbmode (G.kbmode)
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| 28 | #define tio (G.tio)
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| 29 | #define tio0 (G.tio0)
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| 30 | #define INIT_G() do { \
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| 31 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 32 | } while (0)
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| 33 |
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| 34 |
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| 35 | // set raw tty mode
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| 36 | // also used by microcom
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| 37 | // libbb candidates?
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| 38 | static void xget1(struct termios *t, struct termios *oldt)
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| 39 | {
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| 40 | tcgetattr(STDIN_FILENO, oldt);
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| 41 | *t = *oldt;
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| 42 | cfmakeraw(t);
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| 43 | }
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| 44 |
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| 45 | static void xset1(struct termios *t)
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| 46 | {
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| 47 | int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t);
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| 48 | if (ret) {
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| 49 | bb_perror_msg("can't tcsetattr for stdin");
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| 50 | }
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| 51 | }
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| 52 |
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| 53 | int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 54 | int showkey_main(int argc UNUSED_PARAM, char **argv)
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| 55 | {
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| 56 | enum {
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| 57 | OPT_a = (1<<0), // display the decimal/octal/hex values of the keys
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| 58 | OPT_k = (1<<1), // display only the interpreted keycodes (default)
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| 59 | OPT_s = (1<<2), // display only the raw scan-codes
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| 60 | };
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| 61 |
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| 62 | INIT_G();
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| 63 |
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| 64 | // FIXME: aks are all mutually exclusive
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| 65 | getopt32(argv, "aks");
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| 66 |
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| 67 | // prepare for raw mode
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| 68 | xget1(&tio, &tio0);
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| 69 | // put stdin in raw mode
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| 70 | xset1(&tio);
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| 71 |
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[3232] | 72 | #define press_keys "Press any keys, program terminates %s:\r\n\n"
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| 73 |
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[2725] | 74 | if (option_mask32 & OPT_a) {
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[3232] | 75 | // just read stdin char by char
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[2725] | 76 | unsigned char c;
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| 77 |
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[3232] | 78 | printf(press_keys, "on EOF (ctrl-D)");
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| 79 |
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| 80 | // read and show byte values
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[2725] | 81 | while (1 == read(STDIN_FILENO, &c, 1)) {
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| 82 | printf("%3u 0%03o 0x%02x\r\n", c, c, c);
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| 83 | if (04 /*CTRL-D*/ == c)
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| 84 | break;
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| 85 | }
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[3232] | 86 |
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[2725] | 87 | } else {
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[3232] | 88 | // we assume a PC keyboard
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| 89 | xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
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| 90 | printf("Keyboard mode was %s.\r\n\n",
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| 91 | kbmode == K_RAW ? "RAW" :
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| 92 | (kbmode == K_XLATE ? "XLATE" :
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| 93 | (kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
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| 94 | (kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN")))
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| 95 | );
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| 96 |
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[2725] | 97 | // set raw keyboard mode
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| 98 | xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
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| 99 |
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| 100 | // we should exit on any signal; signals should interrupt read
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| 101 | bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo);
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| 102 |
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[3232] | 103 | // inform user that program ends after time of inactivity
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| 104 | printf(press_keys, "10s after last keypress");
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| 105 |
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[2725] | 106 | // read and show scancodes
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| 107 | while (!bb_got_signal) {
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| 108 | char buf[18];
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| 109 | int i, n;
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| 110 |
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| 111 | // setup 10s watchdog
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| 112 | alarm(10);
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[3232] | 113 |
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[2725] | 114 | // read scancodes
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| 115 | n = read(STDIN_FILENO, buf, sizeof(buf));
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| 116 | i = 0;
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| 117 | while (i < n) {
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| 118 | if (option_mask32 & OPT_s) {
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| 119 | // show raw scancodes
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| 120 | printf("0x%02x ", buf[i++]);
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| 121 | } else {
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| 122 | // show interpreted scancodes (default)
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| 123 | char c = buf[i];
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| 124 | int kc;
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| 125 | if (i+2 < n
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| 126 | && (c & 0x7f) == 0
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| 127 | && (buf[i+1] & 0x80) != 0
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| 128 | && (buf[i+2] & 0x80) != 0
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| 129 | ) {
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| 130 | kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f);
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| 131 | i += 3;
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| 132 | } else {
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| 133 | kc = (c & 0x7f);
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| 134 | i++;
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| 135 | }
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| 136 | printf("keycode %3u %s", kc, (c & 0x80) ? "release" : "press");
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| 137 | }
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| 138 | }
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| 139 | puts("\r");
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| 140 | }
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[3232] | 141 |
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| 142 | // restore keyboard mode
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| 143 | xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
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[2725] | 144 | }
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| 145 |
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[3232] | 146 | // restore console settings
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[2725] | 147 | xset1(&tio0);
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| 148 |
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| 149 | return EXIT_SUCCESS;
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| 150 | }
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