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https://github.com/sheumann/hush.git
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139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* shows keys pressed. inspired by kbd package
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*
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* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include <linux/kd.h>
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// set raw tty mode
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// also used by microcom
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// libbb candidates?
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static void xget1(int fd, struct termios *t, struct termios *oldt)
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{
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tcgetattr(fd, oldt);
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*t = *oldt;
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cfmakeraw(t);
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}
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static int xset1(int fd, struct termios *tio, const char *device)
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{
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int ret = tcsetattr(fd, TCSAFLUSH, tio);
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if (ret) {
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bb_perror_msg("can't tcsetattr for %s", device);
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}
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return ret;
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}
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/*
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* GLOBALS
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*/
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struct globals {
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int kbmode;
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struct termios tio, tio0;
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};
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#define G (*ptr_to_globals)
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#define kbmode (G.kbmode)
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#define tio (G.tio)
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#define tio0 (G.tio0)
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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} while (0)
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static void signal_handler(int signo)
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{
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// restore keyboard and console settings
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xset1(STDIN_FILENO, &tio0, "stdin");
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xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
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// alarmed? -> exit 0
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exit(SIGALRM == signo);
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}
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int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int showkey_main(int argc UNUSED_PARAM, char **argv)
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{
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enum {
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OPT_a = (1<<0), // display the decimal/octal/hex values of the keys
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OPT_k = (1<<1), // display only the interpreted keycodes (default)
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OPT_s = (1<<2), // display only the raw scan-codes
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};
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// FIXME: aks are all mutually exclusive
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getopt32(argv, "aks");
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INIT_G();
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// get keyboard settings
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xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
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printf("kb mode was %s\n\nPress any keys. Program terminates %s\n\n",
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kbmode == K_RAW ? "RAW" :
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(kbmode == K_XLATE ? "XLATE" :
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(kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
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(kbmode == K_UNICODE ? "UNICODE" : "?UNKNOWN?")))
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, (option_mask32 & OPT_a) ? "when CTRL+D pressed" : "10s after last keypress"
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);
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// prepare for raw mode
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xget1(STDIN_FILENO, &tio, &tio0);
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// put stdin in raw mode
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xset1(STDIN_FILENO, &tio, "stdin");
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if (option_mask32 & OPT_a) {
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char c;
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// just read stdin char by char
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while (1 == safe_read(STDIN_FILENO, &c, 1)) {
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printf("%3d 0%03o 0x%02x\r\n", c, c, c);
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if (04 /*CTRL-D*/ == c)
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break;
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}
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} else {
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// we should exit on any signal
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bb_signals(BB_FATAL_SIGS, signal_handler);
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// set raw keyboard mode
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xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
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// read and show scancodes
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while (1) {
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char buf[18];
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int i, n;
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// setup 10s watchdog
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alarm(10);
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// read scancodes
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n = read(STDIN_FILENO, buf, sizeof(buf));
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i = 0;
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while (i < n) {
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char c = buf[i];
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// show raw scancodes ordered? ->
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if (option_mask32 & OPT_s) {
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printf("0x%02x ", buf[i++]);
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// show interpreted scancodes (default) ? ->
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} else {
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int kc;
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if (i+2 < n && (c & 0x7f) == 0
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&& (buf[i+1] & 0x80) != 0
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&& (buf[i+2] & 0x80) != 0) {
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kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f);
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i += 3;
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} else {
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kc = (c & 0x7f);
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i++;
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}
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printf("keycode %3d %s", kc, (c & 0x80) ? "release" : "press");
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}
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}
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puts("\r");
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}
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}
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// cleanup
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signal_handler(SIGALRM);
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// should never be here!
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return EXIT_SUCCESS;
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}
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