mbedtls: implement and provide *_data_pending()

... as otherwise we might get stuck thinking there's no more data to
handle.

Reported-by: Damien Vielpeau

Fixes #737

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/vtls/mbedtls.c b/lib/vtls/mbedtls.c
index 77ff326e1..4f887a123 100644
--- a/lib/vtls/mbedtls.c
+++ b/lib/vtls/mbedtls.c
@@ -864,6 +864,11 @@ void Curl_mbedtls_cleanup(void)
   (void)Curl_polarsslthreadlock_thread_cleanup();
 }
 
-
+int Curl_mbedtls_data_pending(const struct connectdata *conn, int sockindex)
+{
+  mbedtls_ssl_context *ssl =
+    (mbedtls_ssl_context *)&conn->ssl[sockindex].ssl;
+  return ssl->in_msglen != 0;
+}
 
 #endif /* USE_MBEDTLS */