movelem.h

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#ifndef _MOVELEM_H_
#define _MOVELEM_H_

#include <stdio.h>
#include <stdlib.h>
#include "random.h"

typedef unsigned char MovElem;

enum _MovUnits {
    FRONT = 0,
    LEFT  = 1,
    RIGHT = 2,
    UP    = 3,
    DOWN  = 4,
};

#ifndef MOVELEM_SOURCE_FILE
    #define MOVELEM_INLINE inline
#else
    #define MOVELEM_INLINE extern inline
#endif

MOVELEM_INLINE
MovElem MovElem_make(unsigned char bb, unsigned char sc){
    return (bb << 4) | sc;
}

MOVELEM_INLINE
MovElem MovElem_random(){
    return MovElem_make(urandom_max(DOWN+1), urandom_max(DOWN+1));
}

MOVELEM_INLINE
unsigned char MovElem_getBB(MovElem elem){
    return elem >> 4;
}

MOVELEM_INLINE
unsigned char MovElem_getSC(MovElem elem){
    return elem & 0x0F;
}

MOVELEM_INLINE
unsigned char MovElem_to_number(MovElem elem){
    unsigned char bb = MovElem_getBB(elem);
    unsigned char sc = MovElem_getSC(elem);
    return bb * 5 + sc;
}

MOVELEM_INLINE
MovElem MovElem_from_number(unsigned char num){
    return MovElem_make(num / 5, num % 5);
}

MOVELEM_INLINE
void MovElem_print(MovElem elem, FILE *fp){
    static const char chars[] = {'F','L','R','U','D'};
    unsigned char bb = elem >> 4;
    unsigned char sc = elem & 0x0F;
    fprintf(fp, "%c,%c", chars[bb], chars[sc]);
}

#endif