/* 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 source tree. */ #include "libbb.h" #include <linux/kd.h> // 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 *tio) { int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, tio); if (ret) { bb_perror_msg("can't tcsetattr for stdin"); } } /* * 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(&tio0); 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(&tio, &tio0); // put stdin in raw mode xset1(&tio); if (option_mask32 & OPT_a) { unsigned char c; // just read stdin char by char while (1 == safe_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); // 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 %3u %s", kc, (c & 0x80) ? "release" : "press"); } } puts("\r"); } } // cleanup signal_handler(SIGALRM); // should never be here! return EXIT_SUCCESS; }