uint16_t tab[];

void f(void) {
        uint16_t y;
        uint16_t *x;
        uint16_t tmp;
        uint8_t *a, *b;
        

        x = tab;   
        
        while(*x) {     
                a = x[1];  
                b = &x[2];  
                
                tmp = 0;     
                for(y = *x; y > 0; y--) {
                        a[tmp] = b[tmp];
                        tmp++;
                }       
                
                x = &b[tmp];
        }       
}