| /* 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. |
| */ |
| //config:config SHOWKEY |
| //config: bool "showkey (4.7 kb)" |
| //config: default y |
| //config: help |
| //config: Shows keys pressed. |
| |
| //applet:IF_SHOWKEY(APPLET(showkey, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_SHOWKEY) += showkey.o |
| |
| //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> |
| |
| |
| 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) |
| |
| |
| // 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) |
| { |
| int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t); |
| if (ret) { |
| bb_simple_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 |
| }; |
| |
| INIT_G(); |
| |
| // FIXME: aks are all mutually exclusive |
| getopt32(argv, "aks"); |
| |
| // prepare for raw mode |
| xget1(&tio, &tio0); |
| // put stdin in raw mode |
| xset1(&tio); |
| |
| #define press_keys "Press any keys, program terminates %s:\r\n\n" |
| |
| if (option_mask32 & OPT_a) { |
| // just read stdin char by char |
| 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 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 *)(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 (!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) { |
| if (option_mask32 & OPT_s) { |
| // show raw scancodes |
| printf("0x%02x ", buf[i++]); |
| } 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 |
| ) { |
| 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"); |
| } |
| |
| // restore keyboard mode |
| xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode); |
| } |
| |
| // restore console settings |
| xset1(&tio0); |
| |
| return EXIT_SUCCESS; |
| } |