On 4/10/2012 12:33 PM, Phil Smith wrote:
OK, Steve, here's the previous post...thanks again!
Umm... that doesn't show the COBOL call, nor the Assembler call
those are what I was wanting to see, to compare them to your
PL/I invocations
From: Phil Smith
Sent: Tuesday, April 10, 2012 9:00 AM
To: [email protected]
Subject: RE: Re: LE C calling HLASM
Steve Comstock wrote:
Ah, so that's what you want it for. But if the output buffer
length is zero, doesn't that tell you to use the input buffer?
And if an argument is omitted, it will appear as zero, right?
I mean, why else would you pass a buffer length of zero?
Because users make mistakes? I mean, we could do that, but it doesn't really
solve the problem. We don't want to force them to type OMITTED - at that point
they might as well code:
rc = THEFUNCTION(inbuffer, inlength, inbuffer, inlength);
What we want is to allow both:
rc = THEFUNCTION(inbuffer, inlength, outbuffer, outlength);
and
rc = THEFUNCTION(inbuffer, inlength); /* Works same as if inbuffer/inlength
specified again as 3rd& 4th parameters */
as we can in COBOL. Or even in C, for that matter. I still find it hard to
believe that PL/I can't do this!
Remember that LIST seemed like the answer, except that the high bit never got
set on the last parameter. And then LINKAGE(SYSTEM) seemed like the answer,
except that you can't specify that on a function call.
...phsiii (will it go 'round in circles...?)
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