text: #ifndef __IW_H
  #define __IW_H
  
  #include <stdbool.h>
  #include <netlink/netlink.h>
  #include <netlink/genl/genl.h>
  #include <netlink/genl/family.h>
  #include <netlink/genl/ctrl.h>
  #include <endian.h>
  
  #include "nl80211.h"
  #include "ieee80211.h"
  
  #define ETH_ALEN 6
  
  /* libnl 1.x compatibility code */
  #if !defined(CONFIG_LIBNL20) && !defined(CONFIG_LIBNL30)
  #  define nl_sock nl_handle
  #endif
  
  struct nl80211_state {
  	struct nl_sock *nl_sock;
  	int nl80211_id;
  };
  
  enum command_identify_by {
  	CIB_NONE,
  	CIB_PHY,
  	CIB_NETDEV,
  	CIB_WDEV,
  };
  
  enum id_input {
  	II_NONE,
  	II_NETDEV,
  	II_PHY_NAME,
  	II_PHY_IDX,
  	II_WDEV,
  };
  
  struct cmd {
  	const char *name;
  	const char *args;
  	const char *help;
  	const enum nl80211_commands cmd;
  	int nl_msg_flags;
  	int hidden;
  	const enum command_identify_by idby;
  	/*
  	 * The handler should return a negative error code,
  	 * zero on success, 1 if the arguments were wrong
  	 * and the usage message should and 2 otherwise.
  	 */
  	int (*handler)(struct nl80211_state *state,
  		       struct nl_cb *cb,
  		       struct nl_msg *msg,
  		       int argc, char **argv,
  		       enum id_input id);
  	const struct cmd *(*selector)(int argc, char **argv);
  	const struct cmd *parent;
  };
  
  #define ARRAY_SIZE(ar) (sizeof(ar)/sizeof(ar[0]))
  #define DIV_ROUND_UP(x, y) (((x) + (y - 1)) / (y))
  
  #define __COMMAND(_section, _symname, _name, _args, _nlcmd, _flags, _hidden, _idby, _handler, _help, _sel)\
  	static struct cmd						\
  	__cmd ## _ ## _symname ## _ ## _handler ## _ ## _nlcmd ## _ ## _idby ## _ ## _hidden\
  	__attribute__((used)) __attribute__((section("__cmd")))	= {	\
  		.name = (_name),					\
  		.args = (_args),					\
  		.cmd = (_nlcmd),					\
  		.nl_msg_flags = (_flags),				\
  		.hidden = (_hidden),					\
  		.idby = (_idby),					\
  		.handler = (_handler),					\
  		.help = (_help),					\
  		.parent = _section,					\
  		.selector = (_sel),					\
  	}
  #define __ACMD(_section, _symname, _name, _args, _nlcmd, _flags, _hidden, _idby, _handler, _help, _sel, _alias)\
  	__COMMAND(_section, _symname, _name, _args, _nlcmd, _flags, _hidden, _idby, _handler, _help, _sel);\
  	static const struct cmd *_alias = &__cmd ## _ ## _symname ## _ ## _handler ## _ ## _nlcmd ## _ ## _idby ## _ ## _hidden
  #define COMMAND(section, name, args, cmd, flags, idby, handler, help)	\
  	__COMMAND(&(__section ## _ ## section), name, #name, args, cmd, flags, 0, idby, handler, help, NULL)
  #define COMMAND_ALIAS(section, name, args, cmd, flags, idby, handler, help, selector, alias)\
  	__ACMD(&(__section ## _ ## section), name, #name, args, cmd, flags, 0, idby, handler, help, selector, alias)
  #define HIDDEN(section, name, args, cmd, flags, idby, handler)		\
  	__COMMAND(&(__section ## _ ## section), name, #name, args, cmd, flags, 1, idby, handler, NULL, NULL)
  
  #define TOPLEVEL(_name, _args, _nlcmd, _flags, _idby, _handler, _help)	\
  	struct cmd							\
  	__section ## _ ## _name						\
  	__attribute__((used)) __attribute__((section("__cmd")))	= {	\
  		.name = (#_name),					\
  		.args = (_args),					\
  		.cmd = (_nlcmd),					\
  		.nl_msg_flags = (_flags),				\
  		.idby = (_idby),					\
  		.handler = (_handler),					\
  		.help = (_help),					\
  	 }
  #define SECTION(_name)							\
  	struct cmd __section ## _ ## _name				\
  	__attribute__((used)) __attribute__((section("__cmd"))) = {	\
  		.name = (#_name),					\
  		.hidden = 1,						\
  	}
  
  #define DECLARE_SECTION(_name)						\
  	extern struct cmd __section ## _ ## _name;
  
  extern const char iw_version[];
  
  extern int iw_debug;
  
  int handle_cmd(struct nl80211_state *state, enum id_input idby,
  	       int argc, char **argv);
  
  struct print_event_args {
  	struct timeval ts; /* internal */
  	bool have_ts; /* must be set false */
  	bool frame, time, reltime;
  };
  
  __u32 listen_events(struct nl80211_state *state,
  		    const int n_waits, const __u32 *waits);
  int __prepare_listen_events(struct nl80211_state *state);
  __u32 __do_listen_events(struct nl80211_state *state,
  			 const int n_waits, const __u32 *waits,
  			 struct print_event_args *args);
  
  
  int mac_addr_a2n(unsigned char *mac_addr, char *arg);
  void mac_addr_n2a(char *mac_addr, unsigned char *arg);
  int parse_hex_mask(char *hexmask, unsigned char **result, size_t *result_len,
  		   unsigned char **mask);
  unsigned char *parse_hex(char *hex, size_t *outlen);
  
  int parse_keys(struct nl_msg *msg, char **argv, int argc);
  
  void print_ht_mcs(const __u8 *mcs);
  void print_ampdu_length(__u8 exponent);
  void print_ampdu_spacing(__u8 spacing);
  void print_ht_capability(__u16 cap);
  void print_vht_info(__u32 capa, const __u8 *mcs);
  
  char *channel_width_name(enum nl80211_chan_width width);
  const char *iftype_name(enum nl80211_iftype iftype);
  const char *command_name(enum nl80211_commands cmd);
  int ieee80211_channel_to_frequency(int chan, enum nl80211_band band);
  int ieee80211_frequency_to_channel(int freq);
  
  void print_ssid_escaped(const uint8_t len, const uint8_t *data);
  
  int nl_get_multicast_id(struct nl_sock *sock, const char *family, const char *group);
  
  char *reg_initiator_to_string(__u8 initiator);
  
  const char *get_reason_str(uint16_t reason);
  const char *get_status_str(uint16_t status);
  
  enum print_ie_type {
  	PRINT_SCAN,
  	PRINT_LINK,
  };
  
  #define BIT(x) (1ULL<<(x))
  
  void print_ies(unsigned char *ie, int ielen, bool unknown,
  	       enum print_ie_type ptype);
  
  void parse_bitrate(struct nlattr *bitrate_attr, char *buf, int buflen);
  void iw_hexdump(const char *prefix, const __u8 *data, size_t len);
  
  #define SCHED_SCAN_OPTIONS "interval <in_msecs> [delay <in_secs>] " \
  	"[freqs <freq>+] [matches [ssid <ssid>]+]] [active [ssid <ssid>]+|passive] [randomise[=<addr>/<mask>]]"
  int parse_sched_scan(struct nl_msg *msg, int *argc, char ***argv);
  
  DECLARE_SECTION(set);
  DECLARE_SECTION(get);
  
  #endif /* __IW_H */
  