[C] Keyboard State bitmap

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <stdbool.h>

typedef struct
{
   char* keys;

} Keyboard;

Keyboard* createKeyboard(int);
bool getKeyboardKey(Keyboard* , int);
void setKeyboardKey(Keyboard* , int, bool);

int main()
{
    Keyboard* mykeys = createKeyboard(20);
    setKeyboardKey(mykeys, 5, 1);
    getKeyboardKey(mykeys, 5);
}

Keyboard* createKeyboard(int ksize)
{
    ksize = ksize < 8 ? 8 : ksize;
    Keyboard* kb;
    kb = malloc(sizeof(Keyboard));
    kb->keys = malloc(sizeof(char)*ceil(ksize/8));

    return kb;
}

bool getKeyboardKey(Keyboard* kb, int key)
{
    char* keyptr = kb->keys;

    int keybyte = floor(key/8);
    int keybit  = (key%8);

    keyptr += (keybyte-1);
    char kbyte = *keyptr;
    bool kbit = (kbyte >> keybit) & 0x01;

    printf("Bits: %i",kbit);
    return kbit;
}

void setKeyboardKey(Keyboard* kb, int key, bool onoff)
{
    char* keyptr = kb->keys;

    int keybyte = floor(key/8);
    int keybit  = (key%8);

    if(onoff)
    {
        kb->keys[keybyte-1] |= (1 << keybit);
    }
    else
    {
        kb->keys[keybyte-1] &= ~(1 << keybit);
    }
}