implemented some socket functions

src/network/endpoint.c

@@ -0,0 +1,28 @@
+#include "endpoint.h"
+#include "network.h"
+
+struct sockaddr_in EndpointIPv4_toSockaddr(EndpointIPv4 end){
+    struct sockaddr_in saddr = {0};
+    saddr.sin_family = AF_INET;
+    saddr.sin_addr.s_addr = end.address.UintBigEndian;
+    /* transforms port number to big endian (network order) */
+    saddr.sin_port = htons(end.port);
+    return saddr;
+}
+
+EndpointIPv4 EndpointIPv4_fromSockaddr(struct sockaddr_in saddr){
+    EndpointIPv4 end;
+    end.address = AddressIPv4_fromU32(saddr.sin_addr.s_addr);
+    /* transforms port number to little endian (normal order) */
+    end.port = ntohs(saddr.sin_port);
+    return end;
+}
+
+AddressIPv4 AddressIPv4_fromStr(cstr);
+
+str AddressIPv4_toStr(AddressIPv4 address);
+
+EndpointIPv4 EndpointIPv4_fromStr(cstr s);
+
+str EndpointIPv4_toStr(EndpointIPv4 end);
+

src/network/endpoint.h

@@ -0,0 +1,39 @@
+#pragma once
+#include "tlibc/std.h"
+#include "tlibc/string/str.h"
+#include "network.h"
+
+#define port_INVALID ((port)~0)
+#define port_is_invalid(PORT) (PORT == port_INVALID)
+
+
+typedef union AddressIPv4 {
+    u32 UintBigEndian;
+    u8 bytes[4];
+} AddressIPv4;
+
+#define AddressIPv4_ANY      AddressIPv4_fromBytes(0,0,0,0)
+#define AddressIPv4_LOOPBACK AddressIPv4_fromBytes(127,0,0,1)
+#define AddressIPv4_INVALID  AddressIPv4_fromBytes(255,255,255,255)
+#define AddressIPv4_is_invalid(ADDR) (ADDR.UintBigEndian == (u32)~0)
+
+#define AddressIPv4_fromBytes(A, B, C, D) ((AddressIPv4){.bytes={A,B,C,D}})
+#define AddressIPv4_fromU32(N) ((AddressIPv4){.UintBigEndian=N})
+AddressIPv4 AddressIPv4_fromStr(cstr);
+str AddressIPv4_toStr(AddressIPv4 address);
+
+
+typedef struct EndpointIPv4 {
+    AddressIPv4 address;
+    u16 port;
+} EndpointIPv4;
+
+#define EndpointIPv4_INVALID EndpointIPv4_create(AddressIPv4_INVALID, port_INVALID)
+#define EndpointIPv4_is_invalid(ENDP) (AddressIPv4_is_invalid(ENDP.address) || port_is_invalid(ENDP.port))
+
+#define EndpointIPv4_create(ADDR, PORT) ((EndpointIPv4){ADDR, PORT})
+EndpointIPv4 EndpointIPv4_fromStr(cstr s);
+str EndpointIPv4_toStr(EndpointIPv4 end);
+
+struct sockaddr_in EndpointIPv4_toSockaddr(EndpointIPv4 end);
+EndpointIPv4 EndpointIPv4_fromSockaddr(struct sockaddr_in saddr);

src/network/network.c

@@ -0,0 +1,25 @@
+#include "network.h"
+#include "network.h"
+
+Result(void) network_init(){
+#if _WIN32
+    // Initialize Winsock
+    WSADATA wsaData = {0};
+    int result = WSAStartup(MAKEWORD(2,2), &wsaData);
+    if (result != 0) {
+        return RESULT_ERROR(sprintf_malloc(64, "WSAStartup failed with error code 0x%X", result), true);
+    }
+#endif
+    return RESULT_VOID;
+}
+
+Result(void) network_deinit(){
+#if _WIN32
+    // Deinitialize Winsock
+    int result = WSACleanup();
+    if (result != 0) {
+        return RESULT_ERROR(sprintf_malloc(64, "WSACleanup failed with error code 0x%X", result), true);
+    }
+#endif
+    return RESULT_VOID;
+}

src/network/network.h

@@ -0,0 +1,22 @@
+#pragma once
+#include "tlibc/errors.h"
+
+#if defined(_WIN64) || defined(_WIN32)
+    #define KN_USE_WINSOCK 1
+#else 
+    #define KN_USE_WINSOCK 0
+#endif
+
+#if KN_USE_WINSOCK
+    #include <winsock2.h>
+#else
+    #include <sys/types.h>
+    #include <sys/socket.h>
+    #include <netinet/in.h>
+    #include <arpa/inet.h>
+    #include <netdb.h>
+    #include <unistd.h>
+#endif
+
+Result(void) network_init();
+Result(void) network_deinit();

src/network/socket.c

@@ -0,0 +1,46 @@
+#include "network.h"
+#include "network.h"
+#include "socket.h"
+
+Result(Socket) socket_open_TCP(){
+    Socket s = socket(AF_INET, SOCK_STREAM, 0);
+    if(s == -1){
+        return RESULT_ERROR("can't create socket", false);
+    }
+
+    return RESULT_VALUE(i64, s);
+}
+
+void socket_close(Socket s){
+#if KN_USE_WINSOCK
+    closesocket(s);
+#else
+    close(s);
+#endif
+}
+
+Result(void) socket_shutdown(Socket s, SocketShutdownType direction){
+    if(shutdown(s, (int)direction) == -1)
+        return RESULT_ERROR("shutdown() failed", false);
+    return RESULT_VOID;
+}
+
+Result(void) socket_bind(Socket s, EndpointIPv4 local_end){
+    struct sockaddr_in sockaddr = EndpointIPv4_toSockaddr(local_end);
+    if(bind(s, (void*)&sockaddr, sizeof(sockaddr)) != 0)
+        return RESULT_ERROR("bind() failed", false);
+    return RESULT_VOID;
+}
+
+Result(void) socket_listen(Socket s, i32 backlog){
+    if(listen(s, backlog) != 0)
+        return RESULT_ERROR("listen() failed", false);
+    return RESULT_VOID;
+}
+
+Result(Socket) socket_accept(Socket main_socket) {
+    struct sockaddr_in remote_addr = {0};
+    i32 sockaddr_size = sizeof(remote_addr);
+    Socket user_connection = accept(main_socket, (struct sockaddr*)&remote_addr, (void*)&sockaddr_size);
+    return RESULT_VALUE(i64, user_connection);
+}

src/network/socket.h

@@ -0,0 +1,18 @@
+#pragma once
+#include "endpoint.h"
+#include "tlibc/errors.h"
+
+typedef enum SocketShutdownType {
+    SocketShutdownType_Receive = 0,
+    SocketShutdownType_Send = 1,
+    SocketShutdownType_Both = 2,
+} SocketShutdownType;
+
+typedef i64 Socket;
+
+Result(Socket) socket_open_TCP();
+void socket_close(Socket s);
+Result(void) socket_shutdown(Socket s, SocketShutdownType direction);
+Result(void) socket_bind(Socket s, EndpointIPv4 local_end);
+Result(void) socket_listen(Socket s, i32 backlog);
+Result(Socket) socket_accept(Socket main_socket);