*
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
*
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
+//usage:#define showkey_trivial_usage
+//usage: "[-a | -k | -s]"
+//usage:#define showkey_full_usage "\n\n"
+//usage: "Show keys pressed\n"
+//usage: "\n -a Display decimal/octal/hex values of the keys"
+//usage: "\n -k Display interpreted keycodes (default)"
+//usage: "\n -s Display raw scan-codes"
+
#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 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)
+// set raw tty mode
+// also used by microcom
+// libbb candidates?
+static void xget1(struct termios *t, struct termios *oldt)
+{
+ tcgetattr(STDIN_FILENO, oldt);
+ *t = *oldt;
+ cfmakeraw(t);
+}
+
+static void xset1(struct termios *t)
{
- // restore keyboard and console settings
- xset1(STDIN_FILENO, &tio0, "stdin");
- xioctl(STDIN_FILENO, KDSKBMODE, (void *)kbmode);
- // alarmed? -> exit 0
- exit(SIGALRM == signo);
+ int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t);
+ if (ret) {
+ bb_perror_msg("can't tcsetattr for stdin");
+ }
}
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
+ 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
};
+ INIT_G();
+
// 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);
+ xget1(&tio, &tio0);
// put stdin in raw mode
- xset1(STDIN_FILENO, &tio, "stdin");
+ xset1(&tio);
+
+#define press_keys "Press any keys, program terminates %s:\r\n\n"
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);
+ unsigned char c;
+
+ printf(press_keys, "on EOF (ctrl-D)");
+
+ // read and show byte values
+ while (1 == read(STDIN_FILENO, &c, 1)) {
+ printf("%3u 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);
+ // we assume a PC keyboard
+ xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
+ printf("Keyboard mode was %s.\r\n\n",
+ kbmode == K_RAW ? "RAW" :
+ (kbmode == K_XLATE ? "XLATE" :
+ (kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
+ (kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN")))
+ );
+
// set raw keyboard mode
- xioctl(STDIN_FILENO, KDSKBMODE, (void *)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
+ xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
+
+ // we should exit on any signal; signals should interrupt read
+ bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo);
+
+ // inform user that program ends after time of inactivity
+ printf(press_keys, "10s after last keypress");
// read and show scancodes
- while (1) {
+ while (!bb_got_signal) {
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) {
+ // show raw scancodes
printf("0x%02x ", buf[i++]);
- // show interpreted scancodes (default) ? ->
} else {
+ // show interpreted scancodes (default)
+ char c = buf[i];
int kc;
- if (i+2 < n && (c & 0x7f) == 0
- && (buf[i+1] & 0x80) != 0
- && (buf[i+2] & 0x80) != 0) {
+ 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");
+ printf("keycode %3u %s", kc, (c & 0x80) ? "release" : "press");
}
}
puts("\r");
}
+
+ // restore keyboard mode
+ xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
}
- // cleanup
- signal_handler(SIGALRM);
+ // restore console settings
+ xset1(&tio0);
- // should never be here!
return EXIT_SUCCESS;
}