uthash_example.c

#include <string.h>  /* strcpy */
#include <stdlib.h>  /* malloc */
#include <stdio.h>   /* printf */
#include "uthash.h"

struct my_struct {
    char name[10];             /* key (string is WITHIN the structure) */
    int id;
    UT_hash_handle hh;         /* makes this structure hashable */
};

int main(int argc, char *argv[]) {
    const char *names[] = { "joe", "bob", "betty", NULL };
    struct my_struct *s, *tmp, *users = NULL;

    for (int i = 0; names[i]; ++i) {
        s = (struct my_struct *)malloc(sizeof *s);
        strcpy(s->name, names[i]);
        s->id = i;
        HASH_ADD_STR(users, name, s);
    }

    HASH_FIND_STR(users, "betty", s);
    if (s) printf("betty's id is %d\n", s->id);

    /* free the hash table contents */
    HASH_ITER(hh, users, s, tmp) {
      HASH_DEL(users, s);
      free(s);
    }
    return 0;
}