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/*
* keyboardBuffer.c
*
* Created on: 1.8.2008
* Author: Karel Podvolecky
*
* Jednoducha fronta stisknutych klaves.
*
*/
#include <stdio.h>
#include <assert.h>
#include <SDL.h>
#include "keyboardBuffer.h"
static keyboardBuffer_t *keyboardBuffer=NULL;
static SDL_keysym emptyKey;
/*
* Inicializuje klavesovy buffer. Parametr udava pocet klaves.
*/
void initKeyboardBuffer(int size){
assert(size>0);
assert(keyboardBuffer==NULL);
keyboardBuffer = malloc(sizeof(keyboardBuffer_t));
assert(keyboardBuffer!=NULL);
memset(keyboardBuffer, 0, sizeof(keyboardBuffer_t));
keyboardBuffer->buff = malloc(size * sizeof(SDL_keysym));
assert(keyboardBuffer->buff!=NULL);
memset(keyboardBuffer->buff, 0, size * sizeof(SDL_keysym));
keyboardBuffer->begin=0;
keyboardBuffer->end=0;
keyboardBuffer->count=0;
keyboardBuffer->size=size;
emptyKey.sym = SDLK_UNKNOWN;
}
/*
* Vyprazdni buffer.
*/
void clearKeyboardBuffer(){
assert(keyboardBuffer!=NULL);
keyboardBuffer->begin=0;
keyboardBuffer->end=0;
keyboardBuffer->count=0;
memset(keyboardBuffer->buff, 0, keyboardBuffer->size * sizeof(SDL_keysym));
}
/*
* Prida klavesu na konec bufferu. Pokud je buffer preplnen,
* vypise chybu na chybovy vystup a klavesu zahodi.
*/
bool_t pushKeyToKeyboardBuffer(SDL_keysym key){
assert(keyboardBuffer!=NULL);
if (keyboardBuffer->count >= keyboardBuffer->size){
fprintf(stderr, "Preteceni klavesoveho bufferu! Zahazuji klavesu: %02x\n", key.sym);
return FALSE;
}
keyboardBuffer->buff[keyboardBuffer->end] = key;
keyboardBuffer->end++;
if (keyboardBuffer->end>=keyboardBuffer->size)
keyboardBuffer->end=0;
keyboardBuffer->count++;
return TRUE;
}
/*
* Vyjme prvni klavesu z bufferu a vrati ji. Pokud je buffer prazdny,
* vypise chybu na chybovy vystup a vrati SDLK_UNKNOWN
*/
SDL_keysym popKeyFromKeyboardBuffer(){
assert(keyboardBuffer!=NULL);
if (keyboardBuffer->count <= 0){
fprintf(stderr, "Podteceni klavesoveho bufferu!\n");
return emptyKey;
}
SDL_keysym key = keyboardBuffer->buff[keyboardBuffer->begin];
keyboardBuffer->buff[keyboardBuffer->begin]=emptyKey;
keyboardBuffer->begin++;
if (keyboardBuffer->begin>=keyboardBuffer->size)
keyboardBuffer->begin=0;
keyboardBuffer->count--;
return key;
}
/*
* Velikost bufferu.
*/
int getKeyboardBufferSize(){
assert(keyboardBuffer!=NULL);
return keyboardBuffer->size;
}
/*
* Pocet klaves v bufferu.
*/
int KeyboardBufferCount(){
assert(keyboardBuffer!=NULL);
return keyboardBuffer->count;
}
bool_t isAnyKeyInKeyboardBuffer(){
return KeyboardBufferCount()>0 ? TRUE : FALSE;
}
/*
* Uvolni buffer. Pokud neni prazdny, vypise predtim
* info o zaplneni na chybovy vystup.
*/
void quitKeyboardBuffer(){
assert(keyboardBuffer!=NULL);
if (keyboardBuffer->count>0){
fprintf(stderr, "Klavesovy buffer neni prazdny!\n");
}
free(keyboardBuffer->buff);
free(keyboardBuffer);
keyboardBuffer=NULL;
}
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