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/* Copyright 2010 Stefan Tomanek <stefan.tomanek+th@wertarbyte.de>
* You have permission to copy, modify, and redistribute under the
* terms of the GPLv3 or any later version.
* For full license terms, see COPYING.
*/
#include <stdio.h>
#include <linux/input.h>
#include <stdlib.h>
#include <string.h>
#include "eventnames.h"
#include "keystate.h"
void init_keystate_holder(keystate_holder **ksh) {
if (*ksh == NULL) {
*ksh = malloc(sizeof(keystate_holder));
}
if (*ksh == NULL) {
fprintf(stderr, "Unable to allocate memory for keystate table!\n");
return;
}
int i;
for (i=0; i<=KEY_MAX; i++) {
(**ksh)[i] = 0;
}
}
/*
* Keep track of a pressed or released key
*/
void change_keystate( keystate_holder ksh, struct input_event ev ) {
if (ev.type != EV_KEY)
return;
if (ev.code > KEY_MAX)
return;
switch(ev.value) {
case 1: // pressed
ksh[ev.code]++;
break;
case 0: // released
if (ksh[ev.code] > 0) {
ksh[ev.code]--;
}
break;
}
}
char *get_keystate(keystate_holder ksh) {
return get_keystate_ignore_key( ksh, -1 );
}
char *get_keystate_ignore_key(keystate_holder ksh, int ignore_key) {
const int bsize = 1024;
char *KS = "+";
char buf[bsize];
buf[0] = '\0';
int i;
int n = 0;
for (i=0; i<=KEY_MAX; i++) {
if (i != ignore_key && ksh[i] > 0) {
if (n>0) {
strncat( buf, KS, bsize-1-strlen(KS) );
}
const char *name = lookup_event_name_i(EV_KEY, i);
strncat( &(buf[0]), name, bsize-1-strlen(buf) );
n++;
}
}
char *res = malloc( sizeof(char) * (1+strlen(buf)) );
if (res) {
strcpy( res, buf );
}
return res;
}
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