Hi Andrew,
On 2012-01-25 10:57, Andrew Ross wrote:
> If the string contained characters, then just the characters were passed
> (with trailing spaces removed). If a null string was passed (i.e. of
> length 0), then the returned string was a C NULL string. If the fortran
> string was of length > 0, but was all spaces, then a single space was
> passed to C. This seems entirely arbitrary. It made the examples work,
> but wouldn't definitely do what the user expected.
>
> I suggest we continue as we are following Alan's changes, i.e. pass
> EXACTLY the fortran string to C. The onus is then on the user to ensure
> the string is the right length or to strip any unnecessary spaces. We
> can't do this manually since we don't know which trailing spaces are
> necessary and which are not.
>
> This will be an API change for the f95 bindings, and will require
> a number of examples to be updated. Are people happy with this?
>
Well, what I have been thinking about is the following:
Rather than divine (in the spirit of the old implementation) if trailing
blanks are significant, let the user append an achar(0) as the last
character if trailing blanks are significant. I will rework the
examples to incorporate that.
It can be as simple as:
call pllab( 'Tight string ', &
'String with trailing blanks '//achar(0))
We can even define a PL_END_OF_STRING parameter to the module, so that
this implementation detail is hidden.
That way the changes are minimal - we will need to document this of course.
Regards,
Arjen
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