ip_addr.c File Reference

This is the IPv4 address tools implementation. More...

Go to the source code of this file.

Functions
u8_t	ip_addr_isbroadcast (ip_addr_t *addr, struct netif *netif)
	Determine if an address is a broadcast address on a network interface.
u32_t	ipaddr_addr (const char *cp)
	Ascii internet address interpretation routine.
int	ipaddr_aton (const char *cp, ip_addr_t *addr)
	Check whether "cp" is a valid ascii representation of an Internet address and convert to a binary address.
char *	ipaddr_ntoa (ip_addr_t *addr)
	Convert numeric IP address into decimal dotted ASCII representation.
char *	ipaddr_ntoa_r (ip_addr_t *addr, char *buf, int buflen)
	Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.

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Detailed Description

This is the IPv4 address tools implementation.

Definition in file ip_addr.c.

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Function Documentation

u8_t ip_addr_isbroadcast	(	ip_addr_t *	addr,
		struct netif *	netif
	)

Determine if an address is a broadcast address on a network interface.

Parameters:

addr	address to be checked
netif	the network interface against which the address is checked

Returns:

returns non-zero if the address is a broadcast address

Definition at line 54 of file ip_addr.c.

u32_t ipaddr_addr

(

const char *

cp )

Ascii internet address interpretation routine.

The value returned is in network order.

Parameters:

cp	IP address in ascii represenation (e.g. "127.0.0.1")

Returns:

ip address in network order

Definition at line 100 of file ip_addr.c.

int ipaddr_aton	(	const char *	cp,
		ip_addr_t *	addr
	)

Check whether "cp" is a valid ascii representation of an Internet address and convert to a binary address.

Returns 1 if the address is valid, 0 if not. This replaces inet_addr, the return value from which cannot distinguish between failure and a local broadcast address.

Parameters:

cp	IP address in ascii represenation (e.g. "127.0.0.1")
addr	pointer to which to save the ip address in network order

Returns:

1 if cp could be converted to addr, 0 on failure

Definition at line 122 of file ip_addr.c.

char* ipaddr_ntoa

(

ip_addr_t *

addr )

Convert numeric IP address into decimal dotted ASCII representation.

returns ptr to static buffer; not reentrant!

returns ptr to static buffer; not reentrant!

Parameters:

addr	ip address in network order to convert

Returns:

pointer to a global static (!) buffer that holds the ASCII represenation of addr

Definition at line 223 of file ip_addr.c.

char* ipaddr_ntoa_r	(	ip_addr_t *	addr,
		char *	buf,
		int	buflen
	)

Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.

Parameters:

addr	ip address in network order to convert
buf	target buffer where the string is stored
buflen	length of buf

Returns:

either pointer to buf which now holds the ASCII representation of addr or NULL if buf was too small

Definition at line 238 of file ip_addr.c.