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#include "fcntl.h"
#include "dirent.h"
#include "stdio.h"
#include "stdlib.h"
#include "unistd.h"
#include "string.h"
#include "sys/stat.h"
#include "sys/kd.h"
#include <linux/input-event-codes.h>
#include <linux/input.h>
#include "input33.h"
#include "logger33.h"
#include "strings33.h"
#define _INPUT_DEVICES_MAX 8
#define _POLL_EVENTS_MAX 16
Input33 __input = {0};
static int _is_char_device( const struct dirent *f );
static Boolean _is_keyboard( Size fd );
static Boolean _is_mouse( Size fd );
static Size _has_key( Size fd, unsigned int event );
static Size _has_rel( Size fd, unsigned int event );
static u64 _has_evbits( Size fd, unsigned int type );
Error input33_init( void )
{
Size i, deviceCount;
Boolean hasKeyboard = E33_FALSE;
Boolean hasMouse = E33_FALSE;
struct dirent **evfs;
deviceCount = scandir( "/dev/input", &evfs, _is_char_device, 0 );
if( deviceCount <= 0 ) {
LOGE( "No valid character devices found." );
return E33_EXIT_FAILURE;
}
for( i = 0; i < deviceCount; ++i )
{
Size j;
Size devFd;
char path[ _STRING_MAX ];
snprintf( path, _STRING_MAX , "%s%s", "/dev/input/", evfs[i]->d_name );
free( evfs[i] );
devFd = open( path, O_RDONLY | O_NONBLOCK );
if( devFd == -1 ) {
continue;
}
if( _is_keyboard( devFd ) )
{
hasKeyboard = E33_TRUE;
__input.devices[ __input.deviceCount++ ] = devFd;
}
else if( _is_mouse(devFd) )
{
hasMouse = E33_TRUE;
__input.devices[ __input.deviceCount++ ] = devFd;
ioctl( devFd, EVIOCGRAB, 1 );
}
else {
close( devFd );
}
if( __input.deviceCount == _INPUT_DEVICES_MAX ){
break;
}
}
free( evfs );
if( (hasKeyboard == E33_TRUE) && (hasMouse == E33_TRUE) ) {
return E33_EXIT_SUCCESS;
}
return E33_EXIT_FAILURE;
}
void input33_poll( void )
{
u16 i;
for( i = 0; i < __input.deviceCount; ++i )
{
Size j;
Size readBytes;
Size eventCount;
struct input_event events[ _POLL_EVENTS_MAX ];
__input.relStates[REL_X] = 0;
__input.relStates[REL_Y] = 0;
__input.relStates[REL_WHEEL] = 0;
readBytes = read( __input.devices[i], events,
sizeof(struct input_event) * _POLL_EVENTS_MAX );
if( readBytes == -1 ) {
continue;
}
eventCount = readBytes / sizeof( struct input_event );
for( j = 0; j < eventCount; ++j )
{
switch( events[j].type )
{
case EV_KEY:
__input.keyStates[ events[j].code ] = events[j].value;
if( (events[j].value == _PRESS) || (events[j].value == _REPEAT) )
{
__input.buffer[__input.tail++] = events[j].code;
__input.tail &= (_KBBUFF_LEN - 1);
if( __input.tail == __input.head )
{
++__input.head;
__input.head &= (_KBBUFF_LEN - 1);
}
}
break;
case EV_REL:
__input.relStates[ events[j].code ] = events[j].value;
break;
}
}
}
__input.modFlags = 6;
ioctl( 0, TIOCLINUX, &__input.modFlags );
ioctl( 0, KDGKBLED, &__input.cnsFlags );
}
void input33_term( void )
{
Size i;
for( i = 0; i < __input.deviceCount; ++i ) {
close( __input.devices[i] );
}
}
static u64 _has_evbits( Size fd, unsigned int type )
{
u64 kbb;
if( ioctl( fd, EVIOCGBIT( 0, (int)sizeof(kbb) ), &kbb ) == -1 ) {
return 0;
}
return (kbb & (1 << type));
}
static Size _has_key( Size fd, unsigned int event )
{
unsigned char bits[ (KEY_MAX >> 3) + 1 ];
if( ioctl( fd, EVIOCGBIT(EV_KEY, (int)sizeof(bits)), &bits ) == -1 ) {
return 0;
}
return ( (bits[event >> 3] & (1 << (event % 8))) > 0 );
}
static Size _has_rel( Size fd, unsigned int event )
{
unsigned char bits[ (REL_MAX >> 3) + 1 ];
if( ioctl( fd, EVIOCGBIT(EV_REL, (int)sizeof(bits)), &bits ) == -1 ) {
return 0;
}
return ( (bits[event >> 3] & (1 << (event % 8))) > 0 );
}
static Boolean _is_mouse( Size fd )
{
if( _has_evbits( fd, EV_KEY ) &&
_has_evbits( fd, EV_REL ) )
{
return( _has_rel( fd, REL_X ) &
_has_rel( fd, REL_Y ) &
_has_key( fd, BTN_LEFT ) &
_has_key( fd, BTN_RIGHT ) & 1 );
}
return E33_FALSE;
}
static Boolean _is_keyboard( Size fd )
{
if( _has_evbits( fd, EV_KEY ) )
{
return( _has_key( fd, KEY_W ) &
_has_key( fd, KEY_SPACE ) &
_has_key( fd, KEY_LEFTSHIFT ) &
_has_key( fd, KEY_I ) & 1 );
}
return E33_FALSE;
}
static int _is_char_device( const struct dirent *f )
{
struct stat fstat;
char path[512];
if( strncmp( f->d_name, "event", 5 ) ) {
return 0;
}
snprintf( path, 512, "%s%s", "/dev/input/", f->d_name );
if( stat( path, &fstat ) ) {
return 0;
}
return S_ISCHR( fstat.st_mode );
}
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