[Solved] Need interpretation of functions and pointers [closed]

by


Very briefly:

((u8_t *)addr)[0]

First octet of addr.

%02x

This is a format string for the printf family of functions. It will print a hexadecimal number padded to 2 digits (e.g. 5c).

((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])

A struct uip_udpip_hdr at the offset UIP_LLH_LEN from uip_buf in memory.

static struct uip_udp_conn *server_conn

A static pointer to a struct uip_udp_conn, called server_conn.

((char *)uip_appdata)[uip_datalen()] = 0;

Set the char at offset uip_datalen() (in chars) from uip_appdata to 0. I’m guessing this is supposed to set a null terminator.

PRINT6ADDR(&UDP_IP_BUF->srcipaddr);

I’m guessing this prints the IPv6 address contained in UDP_IP_BUF->srcipaddr (“source IP address”).

state = uip_ds6_if.addr_list[i].state;

Assign uip_ds6_if.addr_list[i].state to state. 🙂

solved Need interpretation of functions and pointers [closed]