Easy Live Server for Factorial Calculation Winsock

#include <io.h> #include <stdio.h> #include <winsock2.h> #pragma comment(lib,"ws2_32.lib") //Winsock Library typedef long long ll; ll factorial(ll n){ if (n == 0) return 1; return n*factorial(n - 1); } int main(int argc, char *argv[]) { WSADATA wsa; SOCKET s, new_socket; struct sockaddr_in server, client; int c; char *message; printf("Initializing Winsock\t"); if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) { printf("Failed. Error Code : %d", WSAGetLastError()); return 1; } printf("YES\n"); //Create a socket if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { printf("Could not create socket : %d", WSAGetLastError()); } printf("Socket created.\n"); //Prepare the sockaddr_in structure server.sin_family = AF_INET; server.sin_addr.s_addr = INADDR_ANY; server.sin_port = htons(8888); //Bind if (bind(s, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR) { printf("Bind failed with error code : %d", WSAGetLastError()); exit(EXIT_FAILURE); } puts("Bind\t\tYES"); //Listen to incoming connections listen(s, 3); //Accept and incoming connection puts("Waiting for incoming connections\n"); c = sizeof(struct sockaddr_in); while ((new_socket = accept(s, (struct sockaddr *)&client, &c)) != INVALID_SOCKET) { puts("Connection accepted"); char buf[100]; memset(buf, 0, 100); //Reply to the client message = "Connected\n\r"; send(new_socket, message, strlen(message), 0); char data[100]; char *p = data; memset(data, 0, 100); int ret = 1; int showFactorial = 0; while (ret > 0){ memset(buf, 0, 100); ret = recv(new_socket, buf, 100, 0); for (int i = 0; i < strlen(buf); i++){ if (buf[i] == '='){ showFactorial = 1; break; } *p = buf[i]; p++; } printf("%s\n", data); if (showFactorial){ p = data; ll num = atoll(data); ll fact = factorial(num); printf("Factorial of %lld : %lld\n", num, fact); message = (char*)malloc(100); memset(message, 0, 100); sprintf(message, "%lld\n\r", fact); send(new_socket, message, strlen(message), 0); free(message); // END memset(data, 0, 100); showFactorial = 0; } } closesocket(new_socket); } if (new_socket == INVALID_SOCKET) { printf("accept failed with error code : %d", WSAGetLastError()); return 1; } closesocket(s); WSACleanup(); return 0; }