Appending data to pre-exisiting files

[Steve Edwards]

On Wed, 2005-07-27 at 16:08, Richard E Maine wrote:
> On Jul 27, 2005, at 4:27 AM, Steve Edwards wrote:
> Position='append' is a standard feature in f90 and thus will work with 
> all f90 compilers. But there is no simple standard way to do it in f77. 
> Some f77 compilers support the f90 form. The access='append' that you 
> noticed is a nonstandard form specific to a few compilers.

It was the access='append' extension that I unfortunately didn't know
about. Perhaps I should have asked comp.lang.fortran instead of here.
Thanks for the explanation.

> The only standard and portable way to do this in fortran 77 is to open 
> the file and read through it to the end (backspacing after you hit the 
> end of file).  Yes, this is a pain - particularly if the file is large. 
> It is enough of a pain that it is sometimes worth doing nonstandard 
> things even though they cause porting problems.

That has been my implementation using g77. I put up with the ugly code
purely because it *does* have to be portable.

> As long as you have to stick to f77, it will continue o be a pain one 
> way or another.

Looking forward to switching to gfortran now!

S Edwards
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