CODEWITHSUNDEEP
fortran
albert
albert

Reputation: 9057

Automatic determination of free versus fixed form Fortran code

I need to know, for a public domain package, if given Fortran code is free of fixed formatted code and it is, unfortunately, not possible to use the extension for this. Is there a reliable way to do this / is there example code that does this?

Upvotes: 3

Views: 479

Answers (2)

Vladimir F Героям слава
Vladimir F Героям слава

Reputation: 60018

You would have to write your own program/script that checks the form.

Is there any & before column 72 outside of character strings? -> free form

Is there any non-number in the first columns outside of comments? -> free form

There other possibilities, but they would generally have to be able to decide if the statement is valid and that is more difficult:

Deciding if the character in column is a continuation character or a part of a statement in the free-form.

Deciding if a non-! character in the first column is a comment in the fixed form or a valid statement in the free form.

There may be files that conform to both, but that shouldn't be a problem.

Upvotes: 3

Rob
Rob

Reputation: 3381

Silverfrost FTN95 uses the file extension: 

.for, .f or .fix - fixed format
.f90 .f95 - free format

If the user wants to override the default they use a command line option (which they can also turn on-off as a default)

You could use these extensions as a first guess and then look at the first few lines and see if they match

Upvotes: 0

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