mirror of
https://github.com/sheumann/hush.git
synced 2024-12-30 20:29:21 +00:00
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* shows keys pressed. inspired by kbd package
|
|
*
|
|
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
|
|
*
|
|
* Licensed under GPLv2, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
#include <linux/kd.h>
|
|
|
|
// set raw tty mode
|
|
// also used by microcom
|
|
// libbb candidates?
|
|
static void xget1(int fd, struct termios *t, struct termios *oldt)
|
|
{
|
|
tcgetattr(fd, oldt);
|
|
*t = *oldt;
|
|
cfmakeraw(t);
|
|
}
|
|
|
|
static int xset1(int fd, struct termios *tio, const char *device)
|
|
{
|
|
int ret = tcsetattr(fd, TCSAFLUSH, tio);
|
|
|
|
if (ret) {
|
|
bb_perror_msg("can't tcsetattr for %s", device);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* GLOBALS
|
|
*/
|
|
struct globals {
|
|
int kbmode;
|
|
struct termios tio, tio0;
|
|
};
|
|
#define G (*ptr_to_globals)
|
|
#define kbmode (G.kbmode)
|
|
#define tio (G.tio)
|
|
#define tio0 (G.tio0)
|
|
#define INIT_G() do { \
|
|
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
|
} while (0)
|
|
|
|
|
|
static void signal_handler(int signo)
|
|
{
|
|
// restore keyboard and console settings
|
|
xset1(STDIN_FILENO, &tio0, "stdin");
|
|
xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
|
|
// alarmed? -> exit 0
|
|
exit(SIGALRM == signo);
|
|
}
|
|
|
|
int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int showkey_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
enum {
|
|
OPT_a = (1<<0), // display the decimal/octal/hex values of the keys
|
|
OPT_k = (1<<1), // display only the interpreted keycodes (default)
|
|
OPT_s = (1<<2), // display only the raw scan-codes
|
|
};
|
|
|
|
// FIXME: aks are all mutually exclusive
|
|
getopt32(argv, "aks");
|
|
|
|
INIT_G();
|
|
|
|
// get keyboard settings
|
|
xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
|
|
printf("kb mode was %s\n\nPress any keys. Program terminates %s\n\n",
|
|
kbmode == K_RAW ? "RAW" :
|
|
(kbmode == K_XLATE ? "XLATE" :
|
|
(kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
|
|
(kbmode == K_UNICODE ? "UNICODE" : "?UNKNOWN?")))
|
|
, (option_mask32 & OPT_a) ? "when CTRL+D pressed" : "10s after last keypress"
|
|
);
|
|
// prepare for raw mode
|
|
xget1(STDIN_FILENO, &tio, &tio0);
|
|
// put stdin in raw mode
|
|
xset1(STDIN_FILENO, &tio, "stdin");
|
|
|
|
if (option_mask32 & OPT_a) {
|
|
char c;
|
|
// just read stdin char by char
|
|
while (1 == safe_read(STDIN_FILENO, &c, 1)) {
|
|
printf("%3d 0%03o 0x%02x\r\n", c, c, c);
|
|
if (04 /*CTRL-D*/ == c)
|
|
break;
|
|
}
|
|
} else {
|
|
// we should exit on any signal
|
|
bb_signals(BB_FATAL_SIGS, signal_handler);
|
|
// set raw keyboard mode
|
|
xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
|
|
|
|
// read and show scancodes
|
|
while (1) {
|
|
char buf[18];
|
|
int i, n;
|
|
// setup 10s watchdog
|
|
alarm(10);
|
|
// read scancodes
|
|
n = read(STDIN_FILENO, buf, sizeof(buf));
|
|
i = 0;
|
|
while (i < n) {
|
|
char c = buf[i];
|
|
// show raw scancodes ordered? ->
|
|
if (option_mask32 & OPT_s) {
|
|
printf("0x%02x ", buf[i++]);
|
|
// show interpreted scancodes (default) ? ->
|
|
} else {
|
|
int kc;
|
|
if (i+2 < n && (c & 0x7f) == 0
|
|
&& (buf[i+1] & 0x80) != 0
|
|
&& (buf[i+2] & 0x80) != 0) {
|
|
kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f);
|
|
i += 3;
|
|
} else {
|
|
kc = (c & 0x7f);
|
|
i++;
|
|
}
|
|
printf("keycode %3d %s", kc, (c & 0x80) ? "release" : "press");
|
|
}
|
|
}
|
|
puts("\r");
|
|
}
|
|
}
|
|
|
|
// cleanup
|
|
signal_handler(SIGALRM);
|
|
|
|
// should never be here!
|
|
return EXIT_SUCCESS;
|
|
}
|