It would appear that IKJSCAN considers leading commas to be similar to leading
blanks in ignoring them when calculating the parameter offset.
TSO/E Programming Services states:
The Command Scan Service Routine examines the command buffer and performs the
following functions:
It translates all lowercase characters in the subcommand name to
uppercase.
If a valid operand is present, it resets the offset to the number of text
bytes preceding the first non-blank character in the operand field. If a valid
operand is not present, the offset equals the length of the text portion of
the buffer.
It returns a pointer to the subcommand name, the length of the subcommand
name, and a code explaining the results of its scan to the calling routine.
It optionally checks the syntax of the subcommand name.
It recognizes an implicit EXEC command that has a percent sign as the
first character.
It handles leading blanks and embedded comments.
It appears that the second clause is not precise. Probably will be closed by
IBM with a DOC APAR.
On Tue, 2 Jun 2020 23:44:50 -0400 Steve Smith wrote:
:>I'm not sure this is relevant, but today I ran into this:
:>
:>EX 'yadda.zadda.exec(blah)' ',,foo' /* works */
:>
:>but
:>
:>%blah ,,foo /* does not work */
:>
:>"blah" starts with
:>
:>parse arg a ',' b ',' c
:>
:>The leading commas disappear with the so-called indirect invocation, and so
:>'foo' is assigned to a, not c. According to the REXX reference, this is
:>what TSO does. For some reason. I'm sure it's a good reason. Possibly a
:>really good and wonderful reason. But it interferes somewhat with
:>maintaining my sanity.
:>
:>sas
:>
:>On Tue, Jun 2, 2020 at 11:28 PM Seymour J Metz wrote:
:>
:>> Does anybody know of other characters that are problematical in the TSO
:>> command?
:>>
:>>
:>> --
:>> Shmuel (Seymour J.) Metz
:>> http://mason.gmu.edu/~smetz3
:>>
:>>
:>
:>--
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