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lwip_ip4_addr.c File Reference
This is the IPv4 address tools implementation. More...
Go to the source code of this file.
Functions | |
| u8_t | ip4_addr_isbroadcast_u32 (u32_t addr, const struct netif *netif) |
| Determine if an address is a broadcast address on a network interface. | |
| u8_t | ip4_addr_netmask_valid (u32_t netmask) |
| Checks if a netmask is valid (starting with ones, then only zeros) | |
| u32_t | ipaddr_addr (const char *cp) |
| Ascii internet address interpretation routine. | |
| int | ip4addr_aton (const char *cp, ip4_addr_t *addr) |
| Check whether "cp" is a valid ascii representation of an Internet address and convert to a binary address. | |
| char * | ip4addr_ntoa (const ip4_addr_t *addr) |
| Convert numeric IP address into decimal dotted ASCII representation. | |
| char * | ip4addr_ntoa_r (const ip4_addr_t *addr, char *buf, int buflen) |
| Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used. | |
Detailed Description
This is the IPv4 address tools implementation.
Definition in file lwip_ip4_addr.c.
Function Documentation
| u8_t ip4_addr_isbroadcast_u32 | ( | 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
Definition at line 58 of file lwip_ip4_addr.c.
| 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
Definition at line 93 of file lwip_ip4_addr.c.
| int ip4addr_aton | ( | const char * | cp, |
| ip4_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 representation (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 155 of file lwip_ip4_addr.c.
| char* ip4addr_ntoa | ( | const ip4_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 representation of addr
Definition at line 277 of file lwip_ip4_addr.c.
| char* ip4addr_ntoa_r | ( | const ip4_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 293 of file lwip_ip4_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 representation (e.g. "127.0.0.1")
- Returns:
- ip address in network order
Definition at line 133 of file lwip_ip4_addr.c.
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