nextc, getc and ungetc

nextc, getc and ungetc

[Jeremy D. Mullin]

 I am writing a scanner in Ada and was wondering if there was a "peek"
function I could use to get a char from the input file but not move the
file pointer. I found definitions for nextc, getc and ungetc in the
text_io package but they are private declarations.
 Does anyone know of the package/methods I should be using or of any
resources on the web that might help me?

 TIA,
  J.D.
-- 

Re: nextc, getc and ungetc

[James S. Rogers]

There is no equivalent to ungetc in the Ada.Text_IO package.
The equivalent to getc is the get procedure for type character.
The way you read the next character without advancing the file pointer
is the procedure Look_Ahead.

Jim Rogers
Colorado Springs, Colorado

Jeremy D. Mullin wrote in message <798dvo$loq$1@netra.msu.montana.edu>...
> I am writing a scanner in Ada and was wondering if there was a "peek"
>function I could use to get a char from the input file but not move the
>file pointer. I found definitions for nextc, getc and ungetc in the
>text_io package but they are private declarations.
> Does anyone know of the package/methods I should be using or of any
>resources on the web that might help me?
>
> TIA,
>  J.D.
>--

Re: nextc, getc and ungetc

[dennison]

In article <798dvo$loq$1@netra.msu.montana.edu>,
  orion@cs.montana.edu (Jeremy D. Mullin) wrote:
>  I am writing a scanner in Ada and was wondering if there was a "peek"
> function I could use to get a char from the input file but not move the
> file pointer. I found definitions for nextc, getc and ungetc in the
> text_io package but they are private declarations.
>  Does anyone know of the package/methods I should be using or of any
> resources on the web that might help me?

If you want that kind of flexibility, you should look into using direct_io
instead.

T.E.D.

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