#include <stdio.h>
#include <stdlib.h>
#include <uuid.h>
#include <unistd.h>

void check_uuid_status(uint32_t uuidstatus);

int main() {

    /* restrict ourselves to standard IO */
    pledge("stdio", NULL);

    /* allocate space to store a generated UUID, a string representation
     * and status/error information. */
    void *myuuid;
    char *myuuidstr;
    uint32_t uuidstatus;
    myuuid = malloc(sizeof(uuid_t));

    /* create a UUID (Version 4), convert it to a string representation,
     * and print it out to the screen. */
    uuid_create(myuuid, &uuidstatus);
    check_uuid_status(uuidstatus);
    uuid_to_string(myuuid, &myuuidstr, &uuidstatus);
    check_uuid_status(uuidstatus);
    printf("%s\n", myuuidstr);

    /* free malloc()'ed memory. */
    free(myuuid);
    free(myuuidstr);

return 0;
}

/* process and check uuid status. Returns zero if program should continue,
 * otherwise returns -1 if program should exit.
 * If an issue is identified, it prints a message to STDERR.
 */
void check_uuid_status(uint32_t uuidstatus) {
    switch (uuidstatus) {
        case uuid_s_bad_version:
            fprintf(stderr, "Unknown UUID version. Exiting.\n");
            exit(-1);
        case uuid_s_no_memory:
            fprintf(stderr, "Unable to allocate memory. Exiting.\n");
            exit(-1);
    }
}