hashtable: get entry by offset

src/include/hashtable.h

@@ -3,6 +3,7 @@
 
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdint.h>
 
 typedef struct{
 	void* next;
@@ -16,6 +17,7 @@ typedef struct{
 	hashtableentry* entries;
 } hashtable;
 
+void* hashtable_fromoffset(hashtable*, uintmax_t, char*);
 bool hashtable_init(hashtable*, size_t);
 bool hashtable_insert(hashtable*, char*, void*);
 bool hashtable_remove(hashtable*, char*);