Re: GNAT not 'getting' CR or LF?

[mfeldman@seas.gwu.edu (Michael Feldman)]

In article <1994Dec29.230538.15695@nmt.edu>,
Smilin' Ron Finkbine <finkbine@nmt.edu> wrote:
>I am using the gnat system (DOS version) and am writing a 
>Fortran scanner. I am having a problem with the Text_IO.get
>function getting a character. It seems to ignore the carriage
>return and linefeed characters.
>
>What knowledge about gnat am I missing?
>
Not a GNAT issue. Text_IO.Get is doing exactly what the LRM requires.
Quoting from 9XLRM A.10.7:

"After skipping any line terminators and any page terminators,
reads the next character from the specified input file..."

in other words, the procedure is designed to ignore the CRs and LFs.
The behavior is the same in Ada 83 and Ada 95.

To detect EOL in Ada, it's best and most portable to use the 
Text_IO.End_Of_Line function, since in Ada EOL is not treated as a 
character, but as an abstraction. This is Pascal-ish, not C-ish,
input behavior. For more details, see the LRM (Ada 83 or 95) or a good
textbook description of Text_IO.

Hope this helps.

Mike Feldman
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Professor, Dept. of Electrical Engineering and Computer Science
The George Washington University -  Washington, DC 20052 USA
202-994-5919 (voice) - 202-994-0227 (fax) - mfeldman@seas.gwu.edu (Internet)
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