#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "uthash.h"

struct item {
    unsigned char *sort_field;
    size_t sort_field_len; /** Sort field length, in bytes */
    int some_user_data;
    UT_hash_handle hh;
};

int sort_func(const struct item *a, const struct item *b)
{
    int va = *(int*)(void*)a->sort_field;
    int vb = *(int*)(void*)b->sort_field;
    return (va < vb) ? -1 : (va > vb);
}

int main()
{
    size_t i;
    struct item *p, *tmp;
    int total = 0;

    /** The sorted list */
    struct item *list = NULL;
    int counter = 0;

    /* fill in the sorted list */
    for(i=0; i<100; i++) {
        p = (struct item *)malloc(sizeof *p);

        p->sort_field_len = sizeof(int);
        p->sort_field = (unsigned char *)malloc(p->sort_field_len);
        *(int*)(void*)p->sort_field = counter++;

        HASH_ADD_KEYPTR_INORDER(hh, list, p->sort_field, p->sort_field_len, p, sort_func);
    }

    printf("filling in is ok\n");

    HASH_ITER(hh, list, p, tmp) {
        total += *(int*)(void*)p->sort_field;
        HASH_DEL(list, p);
        free(p->sort_field);
        free(p);
    }
    assert(total == 4950);  // sum of 0 through 99

    printf("cleanup is ok\n");
    return 0;
}