#include "brt-internal.h"
#include <assert.h>
#include <string.h>

int keycompare (bytevec key1, ITEMLEN key1len, bytevec key2, ITEMLEN key2len) {
    if (key1len==key2len) {
	return memcmp(key1,key2,key1len);
    } else if (key1len<key2len) {
	int r = memcmp(key1,key2,key1len);
	if (r<=0) return -1; /* If the keys are the same up to 1's length, then return -1, since key1 is shorter than key2. */
	else return 1;
    } else {
	return -keycompare(key2,key2len,key1,key1len);
    }
}

void test_keycompare (void) {
    assert(keycompare("a",1, "a",1)==0);
    assert(keycompare("aa",2, "a",1)>0);
    assert(keycompare("a",1, "aa",2)<0);
    assert(keycompare("b",1, "aa",2)>0);
    assert(keycompare("aa",2, "b",1)<0);
    assert(keycompare("aaaba",5, "aaaba",5)==0);
    assert(keycompare("aaaba",5, "aaaaa",5)>0);
    assert(keycompare("aaaaa",5, "aaaba",5)<0);
    assert(keycompare("aaaaa",3, "aaaba",3)==0);
}

int default_compare_fun (DB *db __attribute__((__unused__)), DBT *a, DBT*b) {
    return keycompare(a->data, a->size, b->data, b->size);
}