fix: implement transport layer stubs

Author: srpatcha

sdk/c/src/eipc_transport.c

@@ -0,0 +1,72 @@
+/*
+ * EIPC Transport Layer — stub implementation
+ * Provides TCP / Unix socket framing (length-prefixed).
+ * TODO: Replace stubs with real socket I/O.
+ */
+
+#include "eipc.h"
+#include <string.h>
+
+eipc_status_t eipc_transport_connect(eipc_socket_t *sock,
+                                     const char *address) {
+    if (!sock || !address)
+        return EIPC_ERR_INVALID;
+
+    /* TODO: parse address, create socket, connect */
+    *sock = EIPC_INVALID_SOCKET;
+    return EIPC_ERR_CONNECT;
+}
+
+eipc_status_t eipc_transport_listen(eipc_socket_t *sock,
+                                    const char *address) {
+    if (!sock || !address)
+        return EIPC_ERR_INVALID;
+
+    /* TODO: parse address, bind, listen */
+    *sock = EIPC_INVALID_SOCKET;
+    return EIPC_ERR_CONNECT;
+}
+
+eipc_status_t eipc_transport_accept(eipc_socket_t listen_sock,
+                                    eipc_socket_t *client_sock,
+                                    char *remote_addr,
+                                    size_t remote_addr_size) {
+    if (!client_sock)
+        return EIPC_ERR_INVALID;
+
+    (void)listen_sock;
+    (void)remote_addr;
+    (void)remote_addr_size;
+
+    /* TODO: accept incoming connection */
+    *client_sock = EIPC_INVALID_SOCKET;
+    return EIPC_ERR_CONNECT;
+}
+
+eipc_status_t eipc_transport_send_frame(eipc_socket_t sock,
+                                        const eipc_frame_t *frame) {
+    if (!frame)
+        return EIPC_ERR_INVALID;
+
+    (void)sock;
+
+    /* TODO: encode frame and send over socket */
+    return EIPC_ERR_IO;
+}
+
+eipc_status_t eipc_transport_recv_frame(eipc_socket_t sock,
+                                        eipc_frame_t *frame) {
+    if (!frame)
+        return EIPC_ERR_INVALID;
+
+    (void)sock;
+
+    /* TODO: read length-prefixed frame from socket */
+    memset(frame, 0, sizeof(*frame));
+    return EIPC_ERR_IO;
+}
+
+void eipc_transport_close(eipc_socket_t sock) {
+    (void)sock;
+    /* TODO: close socket */
+}