Re: API parameter lengths

-----Original Message-----
From: Alexei Pytel <pytel@us.ibm.com>
To: MI400@midrange.com <MI400@midrange.com>
Date: Monday, July 09, 2001 12:03 PM
Subject: Re: API parameter lengths


>
>CALL command does not do this.
>C PEP (program entry point) procedure does. For every main() in C, compiler
>generates a PEP (you may see it if you do DSPMOD on C module). This PEP
>procedure among other things will scan for first blank in each parameter
>and create null-terminated string for each parameter.
>This makes it very difficult to pass non-character parameters to C main().
>
>    Alexei Pytel


how does the C pgm know the max lgth/sizeof  the char parm?

Some pgms ( like qcmdexc ) rcv a lgth parameter and the char parm is max
lgth. Scanning the complete declared lgth of the char parm could result in a
space overrun exception.  no?

also,
What happens at pgm exit?
Will the created null term string be copied back to the passed by addr
variable of the calling pgm?
Does that not risk an overrun of the variable passed by the calling pgm?

Is this moot now because of ILE, one of its few positive contributions to
our platform?

thanks,
Steve Richter

ps: excellent response Simon!




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