- * `ptr' and this call this routine will return NULL. NULL is also
- * returned if the `size' does not fit into the current stack block.
- * If NULL is returned the old memory remains intact.
+ * `ptr' and this call this routine will return NULL (and silc_errno is
+ * set to SILC_ERR_INVALID_ARGUMENT). NULL is also returned if the `size'
+ * does not fit into the current stack block. If NULL is returned the old
+ * memory remains intact.