available for use in that function, and which are documented. That source
should first #define LOCAL_SCAN
+Not every definition that becomes available to the compiler by the inclusion
+of this file is part of the local_scan API. The "Adding a local scan function
+to Exim" chapter in the documentation is definitive.
+
This API is also used for functions called by the ${dlfunc expansion item.
Source for those should first #define DLFUNC_IMPL and then include this file.
Coders of dlfunc routines should read the notes on tainting at the start of