research-portable-memory/c/ext/uthash/tests/test59.c

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

/* hash of hashes */
typedef struct item {
    char name[10];
    struct item *sub;
    int val;
    UT_hash_handle hh;
} item_t;

int main()
{
    item_t *item1, *item2, *tmp1, *tmp2;
    item_t *items=NULL;

    /* make initial element */
    item_t *i = (item_t *)malloc(sizeof(*i));
    if (i == NULL) {
        exit(-1);
    }
    strcpy(i->name, "bob");
    i->sub = NULL;
    i->val = 0;
    HASH_ADD_STR(items, name, i);

    /* add a sub hash table off this element */
    item_t *s = (item_t *)malloc(sizeof(*s));
    if (s == NULL) {
        exit(-1);
    }
    strcpy(s->name, "age");
    s->sub = NULL;
    s->val = 37;
    HASH_ADD_STR(i->sub, name, s);

    /* iterate over hash elements  */
    HASH_ITER(hh, items, item1, tmp1) {
        HASH_ITER(hh, item1->sub, item2, tmp2) {
            printf("$items{%s}{%s} = %d\n", item1->name, item2->name, item2->val);
        }
    }

    /* clean up both hash tables */
    HASH_ITER(hh, items, item1, tmp1) {
        HASH_ITER(hh, item1->sub, item2, tmp2) {
            HASH_DEL(item1->sub, item2);
            free(item2);
        }
        HASH_DEL(items, item1);
        free(item1);
    }

    return 0;
}