411 lines
9.3 KiB
C
411 lines
9.3 KiB
C
#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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/* list of scancodes to demonstrate whether the keycodes are correct;
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* source: http://www.win.tue.nl/~aeb/linux/kbd/scancodes-1.html
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*/
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static char *keydescr[] = {
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NULL, /* 0x00 */
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"Esc", /* 0x01 */
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"1!", /* 0x02 */
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"2@", /* 0x03 */
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"3#", /* 0x04 */
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"4$", /* 0x05 */
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"5%", /* 0x06 */
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"6^", /* 0x07 */
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"7&", /* 0x08 */
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"8*", /* 0x09 */
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"9(", /* 0x0a */
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"0)", /* 0x0b */
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"-_", /* 0x0c */
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"=+", /* 0x0d */
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"Backspace", /* 0x0e */
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"Tab", /* 0x0f */
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"Q", /* 0x10 */
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"W", /* 0x11 */
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"E", /* 0x12 */
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"R", /* 0x13 */
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"T", /* 0x14 */
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"Y", /* 0x15 */
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"U", /* 0x16 */
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"I", /* 0x17 */
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"O", /* 0x18 */
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"P", /* 0x19 */
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"[{", /* 0x1a */
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"]}", /* 0x1b */
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"Enter", /* 0x1c */
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"LCtrl", /* 0x1d */
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"A", /* 0x1e */
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"S", /* 0x1f */
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"D", /* 0x20 */
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"F", /* 0x21 */
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"G", /* 0x22 */
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"H", /* 0x23 */
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"J", /* 0x24 */
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"K", /* 0x25 */
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"L", /* 0x26 */
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";:", /* 0x27 */
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"'\"", /* 0x28 */
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"`~", /* 0x29 */
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"LShift", /* 0x2a */
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"\\|", /* 0x2b */
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"Z", /* 0x2c */
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"X", /* 0x2d */
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"C", /* 0x2e */
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"V", /* 0x2f */
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"B", /* 0x30 */
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"N", /* 0x31 */
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"M", /* 0x32 */
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",<", /* 0x33 */
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".>", /* 0x34 */
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"/?", /* 0x35 */
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"RShift", /* 0x36 */
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"Keypad-*", /* 0x37 */
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"LAlt", /* 0x38 */
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"Space bar", /* 0x39 */
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"CapsLock", /* 0x3a */
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"F1", /* 0x3b */
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"F2", /* 0x3c */
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"F3", /* 0x3d */
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"F4", /* 0x3e */
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"F5", /* 0x3f */
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"F6", /* 0x40 */
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"F7", /* 0x41 */
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"F8", /* 0x42 */
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"F9", /* 0x43 */
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"F10", /* 0x44 */
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"NumLock", /* 0x45 */
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"ScrollLock", /* 0x46 */
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"Keypad-7/Home",/* 0x47 */
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"Keypad-8/Up", /* 0x48 */
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"Keypad-9/PgUp",/* 0x49 */
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"Keypad--", /* 0x4a */
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"Keypad-4/Left",/* 0x4b */
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"Keypad-5", /* 0x4c */
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"Keypad-6/Right",/* 0x4d */
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"Keypad-+", /* 0x4e */
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"Keypad-1/End", /* 0x4f */
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"Keypad-2/Down",/* 0x50 */
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"Keypad-3/PgDn",/* 0x51 */
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"Keypad-0/Ins", /* 0x52 */
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"Keypad-./Del", /* 0x53 */
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"Alt-SysRq", /* 0x54 */
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NULL, /* 0x55 */
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NULL, /* 0x56 */
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"F11", /* 0x57 */
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"F12", /* 0x58 */
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NULL, /* 0x59 */
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NULL, /* 0x5a */
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NULL, /* 0x5b */
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NULL, /* 0x5c */
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NULL, /* 0x5d */
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NULL, /* 0x5e */
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NULL, /* 0x5f */
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NULL, /* 0x60 */
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NULL, /* 0x61 */
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NULL, /* 0x62 */
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NULL, /* 0x63 */
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NULL, /* 0x64 */
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NULL, /* 0x65 */
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NULL, /* 0x66 */
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NULL, /* 0x67 */
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NULL, /* 0x68 */
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NULL, /* 0x69 */
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NULL, /* 0x6a */
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NULL, /* 0x6b */
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NULL, /* 0x6c */
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NULL, /* 0x6d */
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NULL, /* 0x6e */
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NULL, /* 0x6f */
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NULL, /* 0x70 */
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NULL, /* 0x71 */
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NULL, /* 0x72 */
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NULL, /* 0x73 */
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NULL, /* 0x74 */
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NULL, /* 0x75 */
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NULL, /* 0x76 */
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NULL, /* 0x77 */
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NULL, /* 0x78 */
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NULL, /* 0x79 */
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NULL, /* 0x7a */
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NULL, /* 0x7b */
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NULL, /* 0x7c */
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NULL, /* 0x7d */
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NULL, /* 0x7e */
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NULL, /* 0x7f */
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};
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static char *keydescresc[] = {
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NULL, /* 0xe0 0x00 */
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NULL, /* 0xe0 0x01 */
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NULL, /* 0xe0 0x02 */
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NULL, /* 0xe0 0x03 */
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NULL, /* 0xe0 0x04 */
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NULL, /* 0xe0 0x05 */
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NULL, /* 0xe0 0x06 */
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NULL, /* 0xe0 0x07 */
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NULL, /* 0xe0 0x08 */
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NULL, /* 0xe0 0x09 */
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NULL, /* 0xe0 0x0a */
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NULL, /* 0xe0 0x0b */
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NULL, /* 0xe0 0x0c */
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NULL, /* 0xe0 0x0d */
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NULL, /* 0xe0 0x0e */
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NULL, /* 0xe0 0x0f */
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NULL, /* 0xe0 0x10 */
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NULL, /* 0xe0 0x11 */
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NULL, /* 0xe0 0x12 */
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NULL, /* 0xe0 0x13 */
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NULL, /* 0xe0 0x14 */
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NULL, /* 0xe0 0x15 */
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NULL, /* 0xe0 0x16 */
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NULL, /* 0xe0 0x17 */
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NULL, /* 0xe0 0x18 */
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NULL, /* 0xe0 0x19 */
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NULL, /* 0xe0 0x1a */
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NULL, /* 0xe0 0x1b */
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"Keypad Enter", /* 0xe0 0x1c */
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"RCtrl", /* 0xe0 0x1d */
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NULL, /* 0xe0 0x1e */
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NULL, /* 0xe0 0x1f */
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NULL, /* 0xe0 0x20 */
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NULL, /* 0xe0 0x21 */
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NULL, /* 0xe0 0x22 */
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NULL, /* 0xe0 0x23 */
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NULL, /* 0xe0 0x24 */
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NULL, /* 0xe0 0x25 */
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NULL, /* 0xe0 0x26 */
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NULL, /* 0xe0 0x27 */
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NULL, /* 0xe0 0x28 */
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NULL, /* 0xe0 0x29 */
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"fake LShift", /* 0xe0 0x2a */
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NULL, /* 0xe0 0x2b */
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NULL, /* 0xe0 0x2c */
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NULL, /* 0xe0 0x2d */
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NULL, /* 0xe0 0x2e */
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NULL, /* 0xe0 0x2f */
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NULL, /* 0xe0 0x30 */
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NULL, /* 0xe0 0x31 */
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NULL, /* 0xe0 0x32 */
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NULL, /* 0xe0 0x33 */
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NULL, /* 0xe0 0x34 */
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"Keypad-/", /* 0xe0 0x35 */
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"fake RShift", /* 0xe0 0x36 */
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"Ctrl-PrtScn", /* 0xe0 0x37 */
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"RAlt", /* 0xe0 0x38 */
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NULL, /* 0xe0 0x39 */
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NULL, /* 0xe0 0x3a */
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NULL, /* 0xe0 0x3b */
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NULL, /* 0xe0 0x3c */
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NULL, /* 0xe0 0x3d */
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NULL, /* 0xe0 0x3e */
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NULL, /* 0xe0 0x3f */
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NULL, /* 0xe0 0x40 */
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NULL, /* 0xe0 0x41 */
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NULL, /* 0xe0 0x42 */
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NULL, /* 0xe0 0x43 */
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NULL, /* 0xe0 0x44 */
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NULL, /* 0xe0 0x45 */
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"Ctrl-Break", /* 0xe0 0x46 */
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"Grey Home", /* 0xe0 0x47 */
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"Grey Up", /* 0xe0 0x48 */
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"Grey PgUp", /* 0xe0 0x49 */
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NULL, /* 0xe0 0x4a */
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"Grey Left", /* 0xe0 0x4b */
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NULL, /* 0xe0 0x4c */
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"Grey Right", /* 0xe0 0x4d */
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NULL, /* 0xe0 0x4e */
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"Grey End", /* 0xe0 0x4f */
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"Grey Down", /* 0xe0 0x50 */
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"Grey PgDn", /* 0xe0 0x51 */
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"Grey Insert", /* 0xe0 0x52 */
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"Grey Delete", /* 0xe0 0x53 */
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NULL, /* 0xe0 0x54 */
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NULL, /* 0xe0 0x55 */
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NULL, /* 0xe0 0x56 */
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NULL, /* 0xe0 0x57 */
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NULL, /* 0xe0 0x58 */
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NULL, /* 0xe0 0x59 */
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NULL, /* 0xe0 0x5a */
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"LeftWindow", /* 0xe0 0x5b */
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"RightWindow", /* 0xe0 0x5c */
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"Menu", /* 0xe0 0x5d */
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"Power", /* 0xe0 0x5e */
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"Sleep", /* 0xe0 0x5f */
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NULL, /* 0xe0 0x60 */
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NULL, /* 0xe0 0x61 */
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NULL, /* 0xe0 0x62 */
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"Wake", /* 0xe0 0x63 */
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NULL, /* 0xe0 0x64 */
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NULL, /* 0xe0 0x65 */
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NULL, /* 0xe0 0x66 */
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NULL, /* 0xe0 0x67 */
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NULL, /* 0xe0 0x68 */
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NULL, /* 0xe0 0x69 */
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NULL, /* 0xe0 0x6a */
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NULL, /* 0xe0 0x6b */
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NULL, /* 0xe0 0x6c */
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NULL, /* 0xe0 0x6d */
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NULL, /* 0xe0 0x6e */
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NULL, /* 0xe0 0x6f */
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NULL, /* 0xe0 0x70 */
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NULL, /* 0xe0 0x71 */
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NULL, /* 0xe0 0x72 */
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NULL, /* 0xe0 0x73 */
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NULL, /* 0xe0 0x74 */
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NULL, /* 0xe0 0x75 */
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NULL, /* 0xe0 0x76 */
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NULL, /* 0xe0 0x77 */
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NULL, /* 0xe0 0x78 */
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NULL, /* 0xe0 0x79 */
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NULL, /* 0xe0 0x7a */
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NULL, /* 0xe0 0x7b */
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NULL, /* 0xe0 0x7c */
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NULL, /* 0xe0 0x7d */
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NULL, /* 0xe0 0x7e */
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NULL, /* 0xe0 0x7f */
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};
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#define CHECK(r) check((r), #r, __FILE__, __LINE__)
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int check(long r, const char *expr, const char *file, int line)
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{
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char buffer[256];
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if (r < 0) {
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snprintf(buffer, sizeof(buffer), "%s:%d: %s: result %ld, %s",
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file, line, expr, r, strerror(errno));
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exit(-1);
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}
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return r;
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}
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#define SCODE_ESC 0xe0
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#define SCODE_BREAK 0x80
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static int testscancode(int fd)
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{
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static int escape, lctrl, rctrl;
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ssize_t count;
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unsigned char scode;
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char *scodedescr;
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/* read a scancode and test for EOF */
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CHECK(count = read(fd, &scode, sizeof(scode)));
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if (count < sizeof(scode)) {
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return 0;
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}
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/* print scancode */
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printf("0x%.2x ", scode);
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fflush(stdout);
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/* test for escape */
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if (!escape && scode == SCODE_ESC) {
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escape = 1;
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return 1;
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}
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/* describe scancode */
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scodedescr = (escape ? keydescresc : keydescr)[scode & ~SCODE_BREAK];
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if (scodedescr)
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printf("[%s] ", scodedescr);
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if (scode & SCODE_BREAK)
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printf("up\n");
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else
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printf("down\n");
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fflush(stdout);
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/* exit on ctrl-C */
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if ((scode & ~SCODE_BREAK) == 0x1d) {
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if (escape)
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rctrl = !(scode & SCODE_BREAK);
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else
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lctrl = !(scode & SCODE_BREAK);
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}
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if ((lctrl || rctrl) && !escape && scode == 0x2e) {
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return 0;
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}
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/* next key is not escaped */
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escape = 0;
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return 1;
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}
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static volatile int terminate;
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static void set_terminate(int signum)
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{
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terminate = signum;
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}
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static int testscancodes(int fd)
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{
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struct termios termios_old, termios_scan;
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/* this test only works with a TTY as stdin */
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if (!CHECK(isatty(fd))) {
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printf("warning: this test can only be run from a console\n");
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return 0;
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}
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/* catch fatal signals to restore the console */
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CHECK((signal(SIGHUP, set_terminate) == SIG_ERR) ? -1 : 0);
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CHECK((signal(SIGINT, set_terminate) == SIG_ERR) ? -1 : 0);
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CHECK((signal(SIGQUIT, set_terminate) == SIG_ERR) ? -1 : 0);
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CHECK((signal(SIGABRT, set_terminate) == SIG_ERR) ? -1 : 0);
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CHECK((signal(SIGPIPE, set_terminate) == SIG_ERR) ? -1 : 0);
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CHECK((signal(SIGTERM, set_terminate) == SIG_ERR) ? -1 : 0);
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/* configure tty in raw input mode with scancodes and no echo */
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CHECK(tcgetattr(fd, &termios_old));
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termios_scan = termios_old;
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termios_scan.c_iflag &= ~(BRKINT | ICRNL | IGNBRK | IGNCR | IGNPAR);
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termios_scan.c_iflag &= ~(INLCR | INPCK | ISTRIP);
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termios_scan.c_iflag &= ~(IXOFF | IXON | PARMRK);
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termios_scan.c_iflag |= SCANCODES;
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termios_scan.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
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termios_scan.c_lflag &= ~(ICANON | IEXTEN | ISIG | NOFLSH);
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CHECK(tcsetattr(fd, TCSANOW, &termios_scan));
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/* test: is scancode input supported? */
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CHECK(tcgetattr(fd, &termios_scan));
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if (termios_scan.c_iflag & SCANCODES) {
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while (!terminate && CHECK(testscancode(fd))) ;
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} else {
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printf("warning: cannot enable SCANCODES "
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"(are you running from a console?)\n");
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}
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/* report if closed by a signal */
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if (terminate) {
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printf("received signal %d, shutting down\n", terminate);
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}
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/* restore original input mode */
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CHECK(tcsetattr(fd, TCSANOW, &termios_old));
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/* clear buffered input */
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CHECK(tcflush(fd, TCIFLUSH));
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}
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int main(void)
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{
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printf("try out some keys to find out whether SCANCODES works\n");
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printf("press CTRL+C to end this test\n");
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printf("please note that this test only works from a console tty\n");
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/* perform test using stdin */
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if (testscancodes(STDIN_FILENO) < 0)
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return -1;
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else
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return 0;
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}
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