network.c

   1 #include "network.h"
   2
   3 void SendMessage(UDPsocket sock, IPaddress address, ProtocolMessage m) {
   4         UDPpacket packet = {
   5                 .channel = -1,
   6                 .data    = (void *) &m,
   7                 .len     = MessageSize(m),
   8                 .maxlen  = sizeof(ProtocolMessage),
   9                 .status  = 0,
  10                 .address = address,
  11         };
  12
  13         if(!SDLNet_UDP_Send(sock, -1, &packet)) {
  14                 SDL_Log("Messge not sended: %s\n", SDLNet_GetError());
  15                 exit(1);
  16         }
  17 }
  18
  19 bool RecvMessage(UDPsocket sock, IPaddress * address, ProtocolMessage * m) {
  20         UDPpacket packet = {
  21                 .channel = -1,
  22                 .data    = (void *) m,
  23                 .len     = sizeof(ProtocolMessage),
  24                 .maxlen  = sizeof(ProtocolMessage),
  25                 .status  = 0,
  26                 .address = (IPaddress) { 0, 0 },
  27         };
  28
  29         int status;
  30         status = SDLNet_UDP_Recv(sock, &packet);
  31         if(status < 0)
  32                 goto error_recv;
  33         else if(status == 0)
  34                 goto error_norecv;
  35
  36         if(address)
  37                 *address = packet.address;
  38
  39         return true;
  40
  41 error_recv:
  42         SDL_Log("Messge not received: %s\n", SDLNet_GetError());
  43         exit(1);
  44 error_norecv:
  45         return false;
  46 }
  47
  48 bool WaitMessage(UDPsocket sock, IPaddress * address, ProtocolMessage * m, uint32_t timeout) {
  49         uint32_t lastTime = SDL_GetTicks();
  50         while(SDL_GetTicks() - lastTime < timeout) {
  51                 if(RecvMessage(sock, address, m))
  52                         return true;
  53                 SDL_Delay(1);
  54         }
  55         return false;
  56 }