SOR Routines, SOR$BEGIN_MERGE, Description
*Conan The Librarian
The SOR$BEGIN_MERGE routine initializes the merge process by passing arguments that provide the number of input streams, the key specifications, and any merge options. You must define the key by passing either the key buffer address argument or your own comparison routine address. (You can also define the key in a specification file and call the SOR$SPEC_FILE routine.) The SOR$BEGIN_MERGE routine initializes the merge process in the file, record, and mixed interfaces. For record interface on input, you must also pass the merge order, the input routine address, and the longest record length. For files not on disk, you must pass the longest record length. Some of the following condition values are used with different severities, depending on whether SORT/MERGE can recover. Thus, you should use LIB$MATCH_COND if you want to check for a specific status.