#ifndef _NETDB_H
#define _NETDB_H

#ifdef __cplusplus
extern "C" {
#endif

#include <features.h>
#include <netinet/in.h>

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define __NEED_size_t
#include <bits/alltypes.h>
#endif

struct addrinfo {
  int ai_flags;
  int ai_family;
  int ai_socktype;
  int ai_protocol;
  socklen_t ai_addrlen;
  struct sockaddr* ai_addr;
  char* ai_canonname;
  struct addrinfo* ai_next;
};

#define IPPORT_RESERVED 1024

#define AI_PASSIVE 0x01
#define AI_CANONNAME 0x02
#define AI_NUMERICHOST 0x04
#define AI_V4MAPPED 0x08
#define AI_ALL 0x10
#define AI_ADDRCONFIG 0x20
#define AI_NUMERICSERV 0x400

#define NI_NUMERICHOST 0x01
#define NI_NUMERICSERV 0x02
#define NI_NOFQDN 0x04
#define NI_NAMEREQD 0x08
#define NI_DGRAM 0x10
#define NI_NUMERICSCOPE 0x100

#define EAI_BADFLAGS -1
#define EAI_NONAME -2
#define EAI_AGAIN -3
#define EAI_FAIL -4
#define EAI_FAMILY -6
#define EAI_SOCKTYPE -7
#define EAI_SERVICE -8
#define EAI_MEMORY -10
#define EAI_SYSTEM -11
#define EAI_OVERFLOW -12

int getaddrinfo(const char* __restrict,
                const char* __restrict,
                const struct addrinfo* __restrict,
                struct addrinfo** __restrict);
void freeaddrinfo(struct addrinfo*);
int getnameinfo(const struct sockaddr* __restrict,
                socklen_t,
                char* __restrict,
                socklen_t,
                char* __restrict,
                socklen_t,
                int);
const char* gai_strerror(int);

/* Legacy functions follow (marked OBsolete in SUS) */

struct netent {
  char* n_name;
  char** n_aliases;
  int n_addrtype;
  uint32_t n_net;
};

struct hostent {
  char* h_name;
  char** h_aliases;
  int h_addrtype;
  int h_length;
  char** h_addr_list;
};
#define h_addr h_addr_list[0]

struct servent {
  char* s_name;
  char** s_aliases;
  int s_port;
  char* s_proto;
};

struct protoent {
  char* p_name;
  char** p_aliases;
  int p_proto;
};

void sethostent(int);
void endhostent(void);
struct hostent* gethostent(void);

void setnetent(int);
void endnetent(void);
struct netent* getnetent(void);
struct netent* getnetbyaddr(uint32_t, int);
struct netent* getnetbyname(const char*);

void setservent(int);
void endservent(void);
struct servent* getservent(void);
struct servent* getservbyname(const char*, const char*);
struct servent* getservbyport(int, const char*);

void setprotoent(int);
void endprotoent(void);
struct protoent* getprotoent(void);
struct protoent* getprotobyname(const char*);
struct protoent* getprotobynumber(int);

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_POSIX_SOURCE) || \
    (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE + 0 < 200809L) ||            \
    (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE + 0 < 700)
struct hostent* gethostbyname(const char*);
struct hostent* gethostbyaddr(const void*, socklen_t, int);
int* __h_errno_location(void);
#define h_errno (*__h_errno_location())
#define HOST_NOT_FOUND 1
#define TRY_AGAIN 2
#define NO_RECOVERY 3
#define NO_DATA 4
#define NO_ADDRESS NO_DATA
#endif

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
void herror(const char*);
const char* hstrerror(int);
int gethostbyname_r(const char*,
                    struct hostent*,
                    char*,
                    size_t,
                    struct hostent**,
                    int*);
int gethostbyname2_r(const char*,
                     int,
                     struct hostent*,
                     char*,
                     size_t,
                     struct hostent**,
                     int*);
struct hostent* gethostbyname2(const char*, int);
int gethostbyaddr_r(const void*,
                    socklen_t,
                    int,
                    struct hostent*,
                    char*,
                    size_t,
                    struct hostent**,
                    int*);
int getservbyport_r(int,
                    const char*,
                    struct servent*,
                    char*,
                    size_t,
                    struct servent**);
int getservbyname_r(const char*,
                    const char*,
                    struct servent*,
                    char*,
                    size_t,
                    struct servent**);
#define EAI_NODATA -5
#define EAI_ADDRFAMILY -9
#define EAI_INPROGRESS -100
#define EAI_CANCELED -101
#define EAI_NOTCANCELED -102
#define EAI_ALLDONE -103
#define EAI_INTR -104
#define EAI_IDN_ENCODE -105
#define NI_MAXHOST 255
#define NI_MAXSERV 32
#endif

#ifdef __cplusplus
}
#endif

#endif