snprintf_uuid
snprintf_uuid(label, size, &part_gpt_entry->ent.ent_uuid);
snprintf_uuid(buf + 1, bufsz - 1, &entry->type_uuid);
snprintf_uuid(buf + 1, bufsz - 1, type);
snprintf_uuid(buf, sizeof(buf), uuid);
snprintf_uuid(buf, sizeof(buf), uuid);
int snprintf_uuid(char *, size_t, struct uuid *);