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simple bbolt db in c

#include <simpledb.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
int main(){
    // open db, pick random slot number if opening multiple db
    // can safely use 0 if only one db.
    char* err = db_open(42, "foo.db");
    if (err) {
        printf("fatal: %s\n", (char* )err);
        return 1;
    }
    // reading binary
    {
        read_response_t resp = db_read(42, "bucketname/nested1/someRandom");
        if (resp.error) {
            printf("not found? %s\n", resp.data);
        } else {

            printf("existing data found %lu random bytes we wrote:\n", resp.length);
            for (int i = 0; i < resp.length; i++) {
                printf("%02x", ((uint8_t*) resp.data)[i]);
            }
            printf("\n");
            fflush(stdout);
        }
    }

    // write anything
    {
        char buf[32];
        FILE *f = fopen("/dev/urandom", "r");
        fread(buf, 32, 1, f);
        fclose(f);
        err = db_write(42, "bucketname/nested1/someRandom", buf, 32);
        if (err) {
            printf("fatal: %s\n", (char*)  err);
            return 1;
        }
    }

    // write null-terminated string
    {
        printf("writing \"foobar!\"\n");
        err = db_write_string(42, "bucketname/nested2/someString", "foobar!");
        if (err) {
            printf("fatal: %s\n", (char*)  err);
            return 1;
        }
    }

    // reading
    {
        read_response_t resp = db_read(42, "bucketname/nested2/someString");
        if (resp.error) {
            printf("fatal: %s\n", resp.data);
            return 1;
        }

        printf("whew! we read the db, found %lu bytes we wrote:\n", resp.length);
        for (int i = 0; i < resp.length; i++) {
            printf("%c", resp.data[i]);
        }
        printf("\n");
        fflush(stdout);
    }

    // reading binary
    {
        read_response_t resp = db_read(42, "bucketname/nested1/someRandom");
        if (resp.error) {
            printf("fatal: %s\n", resp.data);
            return 1;
        }

        printf("whew! we read the db, found %lu random bytes wrote:\n", resp.length);
        for (int i = 0; i < resp.length; i++) {
            printf("%02x", ((uint8_t*) resp.data)[i]);
        }
        printf("\n");
        fflush(stdout);
    }

    // safely close db
    err = db_close(42);
    if (err) {
        printf("fatal: %s\n", (char*) err);
        return 1;
    }
}