socket: Fix check for pending data.

BUG: https://red.libssh.org/issues/119

Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

include/libssh/libssh.h

@@ -208,10 +208,14 @@ enum ssh_publickey_state_e {
 	SSH_PUBLICKEY_STATE_WRONG=2
 };
 
-/* status flags */
+/* Status flags */
+/** Socket is closed */
 #define SSH_CLOSED 0x01
+/** Reading to socket won't block */
 #define SSH_READ_PENDING 0x02
+/** Session was closed due to an error */
 #define SSH_CLOSED_ERROR 0x04
+/** Output buffer not empty */
 #define SSH_WRITE_PENDING 0x08
 
 enum ssh_server_known_e {

src/socket.c

@@ -695,11 +695,11 @@ int ssh_socket_buffered_write_bytes(ssh_socket s){
 int ssh_socket_get_status(ssh_socket s) {
   int r = 0;
 
-  if (s->read_wontblock) {
+  if (buffer_get_len(s->in_buffer) > 0) {
-    r |= SSH_READ_PENDING;
+      r |= SSH_READ_PENDING;
   }
 
-  if (s->write_wontblock) {
+  if (buffer_get_len(s->out_buffer) > 0) {
       r |= SSH_WRITE_PENDING;
   }