Added separate file for helper functions.

easysock.h

@@ -0,0 +1,44 @@
+#include <string.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+
+/* This function takes:
+a layer 3 - network layer - integer, which must be '4' for IPv4
+and 6 for IPv6; and
+a layer 4 - transport layer - character, which must be 'T' for
+TCP or 'U' for UDP. 
+
+It returns the created socket, or -1 if the socket creation failed.*/
+
+int create_socket(int network, char transport);
+
+
+/* This function fills in the sockaddr struct 'dest' based on the given information.
+'network' is an integer that contains '4' for IPv4 or '6' for IPv6;
+'address' is the address that is filled into the struct;
+port is self-explanatory;
+and dest is a pointer to the sockaddr struct that will be filled in. 
+
+The function exits with error code -2 if the network parameter contained neither '4'
+nor '6'. */
+
+void create_addr(int network, char* address, int port,struct sockaddr* dest);
+
+
+
+/* This function utilizes the above two functions; it creates the socket and
+_binds_ the addresses. It is used for local sockets (server sockets). Parameters are
+same as above. 
+
+It prints the error returned by 'bind' if something went wrong, and exits with error code '-3'.*/
+
+int create_local (int network, char transport, char* address, int port,struct sockaddr* addr_struct);
+
+
+/* This function utilizes the same functions as 'create_local' but _connects_ to the
+requested address. It is used for remoet sockets (client sockets). The paramters are same
+as above.
+
+It prints the error returned by 'connect' if something went wrong, and exits with error code '-3'.*/
+int create_remote (int network,char transport,char* address,int port);