ip_addr.c File Reference

#include "lwip/opt.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"

Functions
u8_t	ip4_addr_isbroadcast (u32_t addr, const struct netif *netif)
u8_t	ip4_addr_netmask_valid (u32_t netmask)
u32_t	ipaddr_addr (const char *cp)
int	ipaddr_aton (const char *cp, ip_addr_t *addr)
char *	ipaddr_ntoa (const ip_addr_t *addr)
char *	ipaddr_ntoa_r (const ip_addr_t *addr, char *buf, int buflen)

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Detailed Description

This is the IPv4 address tools implementation.

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Function Documentation

u8_t ip4_addr_isbroadcast (  u32_t  addr, const 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

u8_t ip4_addr_netmask_valid (  u32_t  netmask  )

Checks if a netmask is valid (starting with ones, then only zeros) Parameters: netmask  the IPv4 netmask to check (in network byte order!) Returns: 1 if the netmask is valid, 0 if it is not

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

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

char* ipaddr_ntoa (  const ip_addr_t *  addr  )

Convert numeric IP address into decimal dotted ASCII representation. 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

char* ipaddr_ntoa_r (  const 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

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