Re: RPG & the IFS & CSV

[Scott Klement <klemscot@xxxxxxxxxxxx>]

Yep, I'm aware of that.

Actually the point I was trying to make was to make a distinction between
the open()/read()/etc APIs which I think of as "System APIs" and the
"fopen()/etc" which I think of as part of the C runtime.

I wasn't trying to teach people how to use them, or I'd have given working
examples :)


On Tue, 14 May 2002, Barbara Morris wrote:

> Scott Klement wrote:
> >
> > fopen() and friends are the C functions for accessing the IFS.  Those do
> > require QC2LE.
> >
>
> If you do use the C functions to access the IFS, watch out for the
> external names of the functions.  When a C program is compiled with
> *IFSIO, fopen() and friends are actually mapped to other names
> (_C_IFS_fopen etc) at compile time.  Look at stdio.h, where it includes
> ifs.h.  ifs.h has some pragma maps that map all the I/O functions to the
> new names.
>
> The RPG version of pragma map is EXTPROC.  So you'd code something like
> this:
>
> D fopen     PR
>  /if defined(USE_IFS)
> D                         extproc('_C_IFS_fopen')
>  /else
> D                         extproc('fopen')
>  /endif
> D   parms
>
> or maybe something like this
>
> D fopen      PR           extproc('fopen')
> D   parms
>
> D fopen_IFS  PR           extproc('_C_IFS_fopen')
> D   parms
>