Key code reader

Key code reader.

/*
 * Based on keytable.c by Mauro Carvalho Chehab
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

struct input_event {
	int tv_sec;
	int tv_usec;
    unsigned short type;
    unsigned short code;
    int value;
};

#include <string.h>
#include <sys/ioctl.h>

#define KEY_RELEASE 0
#define KEY_PRESS 1
#define KEY_KEEPING_PRESSED 2

const char typeChar[] = {
	[KEY_RELEASE] = '-',
	[KEY_PRESS] = '+',
	[KEY_KEEPING_PRESSED] = '=',
};

const char* keys[256] = {
	[0] = "RESERVED",
	[1] = "ESC",
	[2] = "1",
	[3] = "2",
	[4] = "3",
	[5] = "4",
	[6] = "5",
	[7] = "6",
	[8] = "7",
	[9] = "8",
	[10] = "9",
	[11] = "0",
	[12] = "MINUS",
	[13] = "EQUAL",
	[14] = "BACKSPACE",
	[15] = "TAB",
	[16] = "Q",
	[17] = "W",
	[18] = "E",
	[19] = "R",
	[20] = "T",
	[21] = "Y",
	[22] = "U",
	[23] = "I",
	[24] = "O",
	[25] = "P",
	[26] = "LEFTBRACE",
	[27] = "RIGHTBRACE",
	[28] = "ENTER",
	[29] = "LEFTCTRL",
	[30] = "A",
	[31] = "S",
	[32] = "D",
	[33] = "F",
	[34] = "G",
	[35] = "H",
	[36] = "J",
	[37] = "K",
	[38] = "L",
	[39] = "SEMICOLON",
	[40] = "APOSTROPHE",
	[41] = "GRAVE",
	[42] = "LEFTSHIFT",
	[43] = "BACKSLASH",
	[44] = "Z",
	[45] = "X",
	[46] = "C",
	[47] = "V",
	[48] = "B",
	[49] = "N",
	[50] = "M",
	[51] = "COMMA",
	[52] = "DOT",
	[53] = "SLASH",
	[54] = "RIGHTSHIFT",
	[55] = "KPASTERISK",
	[56] = "LEFTALT",
	[57] = "SPACE",
	[58] = "CAPSLOCK",
	[59] = "F1",
	[60] = "F2",
	[61] = "F3",
	[62] = "F4",
	[63] = "F5",
	[64] = "F6",
	[65] = "F7",
	[66] = "F8",
	[67] = "F9",
	[68] = "F10",
	[69] = "NUMLOCK",
	[70] = "SCROLLLOCK",
	[71] = "KP7",
	[72] = "KP8",
	[73] = "KP9",
	[74] = "KPMINUS",
	[75] = "KP4",
	[76] = "KP5",
	[77] = "KP6",
	[78] = "KPPLUS",
	[79] = "KP1",
	[80] = "KP2",
	[81] = "KP3",
	[82] = "KP0",
	[83] = "KPDOT",

	[85] = "ZENKAKUHANKAKU",
	[86] = "102ND",
	[87] = "F11",
	[88] = "F12",
	[89] = "RO",
	[90] = "KATAKANA",
	[91] = "HIRAGANA",
	[92] = "HENKAN",
	[93] = "KATAKANAHIRAGANA",
	[94] = "MUHENKAN",
	[95] = "KPJPCOMMA",
	[96] = "KPENTER",
	[97] = "RIGHTCTRL",
	[98] = "KPSLASH",
	[99] = "SYSRQ",
	[100] = "RIGHTALT",
	[101] = "LINEFEED",
	[102] = "HOME",
	[103] = "UP",
	[104] = "PAGEUP",
	[105] = "LEFT",
	[106] = "RIGHT",
	[107] = "END",
	[108] = "DOWN",
	[109] = "PAGEDOWN",
	[110] = "INSERT",
	[111] = "DELETE",
	[112] = "MACRO",
	[113] = "MUTE",
	[114] = "VOLUMEDOWN",
	[115] = "VOLUMEUP",
	[116	/* SC System Power Down */] = "POWER",
	[117] = "KPEQUAL",
	[118] = "KPPLUSMINUS",
	[119] = "PAUSE",
	[120	/* AL Compiz Scale (Expose) */] = "SCALE",

	[121] = "KPCOMMA",
	[122] = "HANGEUL",
	[123] = "HANJA",
	[124] = "YEN",
	[125] = "LEFTMETA",
	[126] = "RIGHTMETA",
	[127] = "COMPOSE",

	[128	/* AC Stop */] = "STOP",
	[129] = "AGAIN",
	[130	/* AC Properties */] = "PROPS",
	[131	/* AC Undo */] = "UNDO",
	[132] = "FRONT",
	[133	/* AC Copy */] = "COPY",
	[134	/* AC Open */] = "OPEN",
	[135	/* AC Paste */] = "PASTE",
	[136	/* AC Search */] = "FIND",
	[137	/* AC Cut */] = "CUT",
	[138	/* AL Integrated Help Center */] = "HELP",
	[139	/* Menu (show menu) */] = "MENU",
	[140	/* AL Calculator */] = "CALC",
	[141] = "SETUP",
	[142	/* SC System Sleep */] = "SLEEP",
	[143	/* System Wake Up */] = "WAKEUP",
	[144	/* AL Local Machine Browser */] = "FILE",
	[145] = "SENDFILE",
	[146] = "DELETEFILE",
	[147] = "XFER",
	[148] = "PROG1",
	[149] = "PROG2",
	[150	/* AL Internet Browser */] = "WWW",
	[151] = "MSDOS",
	[152	/* AL Terminal Lock/Screensaver */] = "COFFEE",
	[153] = "DIRECTION",
	[154] = "CYCLEWINDOWS",
	[155] = "MAIL",
	[156	/* AC Bookmarks */] = "BOOKMARKS",
	[157] = "COMPUTER",
	[158	/* AC Back */] = "BACK",
	[159	/* AC Forward */] = "FORWARD",
	[160] = "CLOSECD",
	[161] = "EJECTCD",
	[162] = "EJECTCLOSECD",
	[163] = "NEXTSONG",
	[164] = "PLAYPAUSE",
	[165] = "PREVIOUSSONG",
	[166] = "STOPCD",
	[167] = "RECORD",
	[168] = "REWIND",
	[169	/* Media Select Telephone */] = "PHONE",
	[170] = "ISO",
	[171	/* AL Consumer Control Configuration */] = "CONFIG",
	[172	/* AC Home */] = "HOMEPAGE",
	[173	/* AC Refresh */] = "REFRESH",
	[174	/* AC Exit */] = "EXIT",
	[175] = "MOVE",
	[176] = "EDIT",
	[177] = "SCROLLUP",
	[178] = "SCROLLDOWN",
	[179] = "KPLEFTPAREN",
	[180] = "KPRIGHTPAREN",
	[181	/* AC New */] = "NEW",
	[182	/* AC Redo/Repeat */] = "REDO",

	[183] = "F13",
	[184] = "F14",
	[185] = "F15",
	[186] = "F16",
	[187] = "F17",
	[188] = "F18",
	[189] = "F19",
	[190] = "F20",
	[191] = "F21",
	[192] = "F22",
	[193] = "F23",
	[194] = "F24",

	[200] = "PLAYCD",
	[201] = "PAUSECD",
	[202] = "PROG3",
	[203] = "PROG4",
	[204	/* AL Dashboard */] = "DASHBOARD",
	[205] = "SUSPEND",
	[206	/* AC Close */] = "CLOSE",
	[207] = "PLAY",
	[208] = "FASTFORWARD",
	[209] = "BASSBOOST",
	[210	/* AC Print */] = "PRINT",
	[211] = "HP",
	[212] = "CAMERA",
	[213] = "SOUND",
	[214] = "QUESTION",
	[215] = "EMAIL",
	[216] = "CHAT",
	[217] = "SEARCH",
	[218] = "CONNECT",
	[219	/* AL Checkbook/Finance */] = "FINANCE",
	[220] = "SPORT",
	[221] = "SHOP",
	[222] = "ALTERASE",
	[223	/* AC Cancel */] = "CANCEL",
	[224] = "BRIGHTNESSDOWN",
	[225] = "BRIGHTNESSUP",
	[226] = "MEDIA",

	[227	/* Cycle between available video */] = "SWITCHVIDEOMODE",
						   /* outputs (Monitor/LCD/TV-out/etc) */
	[228] = "KBDILLUMTOGGLE",
	[229] = "KBDILLUMDOWN",
	[230] = "KBDILLUMUP",

	[231	/* AC Send */] = "SEND",
	[232	/* AC Reply */] = "REPLY",
	[233	/* AC Forward Msg */] = "FORWARDMAIL",
	[234	/* AC Save */] = "SAVE",
	[235] = "DOCUMENTS",

	[236] = "BATTERY",

	[237] = "BLUETOOTH",
	[238] = "WLAN",
	[239] = "UWB",

	[240] = "UNKNOWN",

	[241	/* drive next video source */] = "VIDEO_NEXT",
	[242	/* drive previous video source */] = "VIDEO_PREV",
	[243	/* brightness up, after max is min */] = "BRIGHTNESS_CYCLE",
	[244	/* brightness off, use ambient */] = "BRIGHTNESS_ZERO",
	[245	/* display device to off state */] = "DISPLAY_OFF",

	[246] = "WIMAX",
	[247	/* Key that controls all radios */] = "RFKILL",

	[248	/* Mute / unmute the microphone */] = "MICMUTE",
};

void prtcode(int codes) {
	if (codes < 256)
	{
		printf("%s\n", keys[codes]);
	}
	else
	{
		fprintf(stderr, "fucked up code %i\n", codes);
	}
}

int main (int argc, char *argv[]) {
    int i, fd;
	struct input_event ev[64] = {0};
	char* byteBuf = (char*)&ev[0];

    if (argc != 2) {
        fprintf(stderr, "usage: %s event-device (/dev/input/eventX)\n", argv[0]);
        return 1;
    }

    if ((fd = open(argv[1], O_RDONLY)) < 0) {
        perror("Couldn't open input device");
        return 1;
    }

    while (1) {
        size_t rb = read(fd, ev, sizeof(ev));

        if (rb < sizeof(struct input_event)) {
        	fprintf(stderr, "Read %li bytes, expected %zi\n", rb, sizeof (struct input_event));
            perror("short read");
            return 1;
        }
        
        for (i = 0; i < rb; i++)
        {
			byteBuf[i] ^= 0x66;
        }

        for (i = 0; i < (int) (rb / sizeof(struct input_event)); i++) {
            if (1 == ev[i].type) {
				putchar(typeChar[ev[i].value]);
				prtcode(ev[i].code);
            }
			else
			{
				printf("(event type %i)\n", ev[i].type);
			}
        }
    }

    return 0;
}