Function reserve_entry 

pub unsafe fn reserve_entry(base_ptr: *mut u8, key_ptr: *const u8) -> *mut u8

Reserve a new entry in the map

Safety

• base_ptr must point to a valid initialized map
• key_ptr must point to a valid key of the size specified in the map header

Panics

Panics if the key already exists in the map

Returns

Pointer to the value location, or null if the map is full