C UINT16 How to get it right?

Question

I\'m new on C programming and I\'m testing some code where I receive and process an UDP packet formatted as follow:

UINT16 port1
UINT16 port2

Answer 1

unsigned int on your system is likely 4 bytes (uint32_t). You can use unsigned int here if you mask out the values in the correct endianess, or simply use a short.

int l = 0;
unsigned short *primaryPort = *(unsigned short) &buffer[l]; 
AddToLog(logInfo, "PrimaryPort: %u\n", primaryPort);
l += sizeof(*primaryPort);
unsigned short *secondaryPort = *(unsigned short) &buffer[l]; 
AddToLog(logInfo, "SecondaryPort: %u\n", secondaryPort);
l += sizeof(*secondaryPort);