showkey: new applet by Vladimir
diff --git a/console-tools/showkey.c b/console-tools/showkey.c
new file mode 100644
index 0000000..e4603e2
--- /dev/null
+++ b/console-tools/showkey.c
@@ -0,0 +1,138 @@
+/* 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 *)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 *)((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;
+}