#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <crypt.h>

int main(int argc, char** argv)
{
	char* password;
	char* salt;

	if (argc == 3) {
		password = argv[1];
		salt = argv[2];
	} else {
		password = getenv("PASSWORD");
		salt = getenv("SALT");
	}

	if (password == NULL) {
		password = "";
	}

	if (salt == NULL) {
		salt = "";
	}

	size_t password_length = strlen(password);
	size_t salt_length = strlen(salt);

	if (password_length == 0 || salt_length == 0) {
		printf("Usage:\n");
		printf("  %s <password> <salt>\n", argv[0]);
		printf("  PASSWORD=<password> SALT=<salt> %s\n", argv[0]);

		return 1;
	}

	printf("%s\n", crypt(password, salt));

	return 0;
}