Added comments to explain functions, and added UDP handling

sock.cpp

@@ -4,10 +4,19 @@
 #include "includes/exception_consts.hpp"
 #include "includes/easysock.hpp"
 
+/* Function to create socket. This function doesn't actually create a socket
+(and isn't meant to be called directly). Instead, the client and server classes
+extend this function, and create the appropriate sockets. */
+
 void Sock::create_socket()  {
 	dest = (struct sockaddr *)malloc(sizeof(struct sockaddr));
+	addrlen = sizeof(*dest);
 }
 
+/* Constructor - This function initializes the object attributes with the given
+parameters. It throws an exception if an IPv4 address was given, but the type
+given is IPv6 (or the other way around). */
+
 Sock::Sock(int ip_ver, char protocol, const char* address, int port) {
 	/* Error checking */
 	if (ip_ver != 4 && ip_ver != 6) {
@@ -29,33 +38,70 @@ Sock::Sock(int ip_ver, char protocol, const char* address, int port) {
         if ((check_ip_ver(address) != 6 && ip_ver == 6) || (check_ip_ver(address) != 4 && ip_ver == 4)) {
 		throw std::invalid_argument("Invalid IP address for given type.");
 	}
-
-	try {
-		create_socket();
-	} catch (int e) {
-		throw;
-	}
 }
 
-void Sock::sendAll(std::string to_send) {
+/* This method sends the given data, through the given socket. Client and server
+classes extend this method, by calling it with different parameters.
+This function needs more testing for TCP, as it focuses on UDP right now. */
+
+void Sock::sendAll(std::string to_send, int dest_sock) {
 	int str_length = to_send.length();
 	int num_bytes_sent = 0; /* Number of bytes sent in one call to send */
 	int total_bytes_sent = 0; /* Total number of bytes sent */
 
-	while (total_bytes_sent < str_length) {
-		num_bytes_sent = send(this->getSockFD(), to_send.substr(total_bytes_sent).data(), str_length - total_bytes_sent, 0);
-		total_bytes_sent += num_bytes_sent;
+	/* For UDP sockets */
+	if (this->protocol == 'U') {
+		sendto(this->sock_fd, to_send.data(), str_length, 0, dest, addrlen);
+	}
+	/* For TCP sockets */
+	else {
+		while (total_bytes_sent < str_length) {
+			num_bytes_sent = send(dest_sock, to_send.substr(total_bytes_sent).data(), str_length - total_bytes_sent, 0);
+			if (num_bytes_sent < 0) {
+				throw errno * -1;
+			}
+			total_bytes_sent += num_bytes_sent;
+		}
 	}
 
 	return;
 }
 
-std::string Sock::recvAll() {
+/* Receives data from given socket into a string, and returns that string. For TCP, the
+'recv' method is called until all the data has been read. For UDP, the 'recvfrom'
+method is only called once.
+This function also needs more testing for TCP. */
+
+std::string Sock::recvAll(int from_sock) {
+	int num_bytes_received;
 	std::string string = std::string();
 	char* buffer = (char *)malloc(100);
-	while (recv(this->getSockFD(), buffer, 100, 0) != 0) {
+	bool has_been_read = false;
+
+	if (this->protocol == 'U') {
+		recvfrom(this->sock_fd, buffer, 100, 0, dest, &addrlen);
 		string.append(std::string(buffer));
 	}
+	/* For TCP sockets */
+	else {
+		while ((num_bytes_received = recv(from_sock, buffer, 100, 0)) != 0) {
+
+			if ((errno == EAGAIN || errno == EWOULDBLOCK)) {
+				if (has_been_read) {
+					break;
+				} else {
+					continue;
+				}
+			}
+
+			if (num_bytes_received < 0) {
+				throw errno * -1;
+			}
+			string.append(std::string(buffer));
+			has_been_read = true;
+		}
+
+	}
 
 	return string;
 }