/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include <stdbool.h>
#include <stdio.h>

#include "macro.h"
#include "strv.h"

bool hostname_is_set(void);

char* gethostname_malloc(void);
char* gethostname_short_malloc(void);
int gethostname_strict(char **ret);

bool valid_ldh_char(char c) _const_;
bool hostname_is_valid(const char *s, bool allow_trailing_dot) _pure_;
char* hostname_cleanup(char *s);

#define machine_name_is_valid(s) hostname_is_valid(s, false)

bool is_localhost(const char *hostname);

static inline bool is_gateway_hostname(const char *hostname) {
        /* This tries to identify the valid syntaxes for the our synthetic "gateway" host. */
        return STRCASE_IN_SET(hostname, "_gateway", "_gateway.");
}

int sethostname_idempotent(const char *s);

int shorten_overlong(const char *s, char **ret);

int read_etc_hostname_stream(FILE *f, char **ret);
int read_etc_hostname(const char *path, char **ret);