writev_emu: stop on the first incomplete write

Just like standard writev, we should only move on to the next block if
all the previous ones have been successfully written out. Otherwise
there is a potential for data loss and/or confusing push functions.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

diff --git a/lib/gnutls_buffers.c b/lib/gnutls_buffers.c
index 198a495346c9b3764d7d0e64da61c06a4f1bc344..71584330990ef11ec759ded3a5843bcab472536d 100644 (file)
--- a/lib/gnutls_buffers.c
+++ b/lib/gnutls_buffers.c
@@ -325,6 +325,9 @@ _gnutls_writev_emu (gnutls_session_t session, gnutls_transport_ptr_t fd, const g
         break;
 
       total += ret;
+
+      if (ret != giovec[j].iov_len)
+        break;
     }
 
   if (total > 0)