copy: Add asn_copy() interface

skeletons/constr_TYPE.c

@@ -54,6 +54,26 @@ asn_fprint(FILE *stream, const asn_TYPE_descriptor_t *td,
     return fflush(stream);
 }
 
+/*
+ * Copy a structuture.
+ */
+int
+asn_copy(const asn_TYPE_descriptor_t *td,
+         void **struct_dst, const void *struct_src) {
+
+    if(!td || !struct_dst || !struct_src) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if(!td->op) {
+        errno = ENOSYS;
+        return -1;
+    }
+    
+    return td->op->copy_struct(td, struct_dst, struct_src);
+}
+
 /* Dump the data into the specified stdio stream */
 static int
 _print2fp(const void *buffer, size_t size, void *app_key) {

skeletons/constr_TYPE.h

@@ -302,6 +302,17 @@ int asn_fprint(FILE *stream, /* Destination stream descriptor */
                const asn_TYPE_descriptor_t *td, /* ASN.1 type descriptor */
                const void *struct_ptr);         /* Structure to be printed */
 
+/*
+ * Copies a source structure (struct_src) into destination structure 
+ * (struct_dst). Allocates memory for the destination structure, if necessary.
+ * RETURN VALUES:
+ *   0: Copy OK.
+ * 	-1: Problem copying the structure.
+ */
+int asn_copy(const asn_TYPE_descriptor_t *td, /* ASN.1 type descriptor */
+             void **struct_dst,               /* Structure to be populated */
+             const void *struct_src);         /* Structure to be copied */
+
 #ifdef __cplusplus
 }
 #endif