add asn_encode* and other encoders
diff --git a/doc/docsrc/asn_enc_rval.inc b/doc/docsrc/asn_enc_rval.inc
new file mode 100644
index 0000000..654e45a
--- /dev/null
+++ b/doc/docsrc/asn_enc_rval.inc
@@ -0,0 +1,17 @@
+
+The function returns a compound structure:
+
+\begin{codesample}
+typedef struct {
+ ssize_t encoded;
+ const asn_TYPE_descriptor_t *failed_type;
+ const void *structure_ptr;
+} asn_enc_rval_t;
+\end{codesample}
+
+\noindent{}In case of unsuccessful encoding, the \code{.encoded} member is set to -1 and
+the other members of the compound structure point to where the encoding has
+failed to proceed further.
+
+In case encoding is successful, the \code{.encoded} member specifies the
+size of the serialized output.