creating temporary files

creating temporary files

[Rajat Datta]

Trying to run aflex on FreeBSD 4.2 using GNAT, I am coming across the
following problem:  in two places the aflex code attempts to create a
temporary file using Create(Temp_File, OUT_FILE) which raises a
USE_ERROR exception.

Any workarounds besides changing the code to explicitly create a
temporary filename?

rajat

Re: creating temporary files

[Martin Dowie]

if the file already exists then you may have to "Open"
it rather it rather than "Create" it.

"Rajat Datta" <rajat@austin.rr.com> wrote in message
news:slrn9m0vjn.1408.rajat@goteborg.austin.rr.com...
> Trying to run aflex on FreeBSD 4.2 using GNAT, I am coming across the
> following problem:  in two places the aflex code attempts to create a
> temporary file using Create(Temp_File, OUT_FILE) which raises a
> USE_ERROR exception.
>
> Any workarounds besides changing the code to explicitly create a
> temporary filename?
>
> rajat

Re: creating temporary files

[David C. Hoos]

Since you didn't say what version of aflex you're using, or what version
of GNAT, it's hard to definitively answer the question.

The package GNAT.OS_Lib has a procedure Create_Temp_File which
will probably fill the bill.

I know not all versions of aflex that are out there are gnat-compatible,
but if memory serves me correctly, Pascal Obry ported a version which
is gnat-compatible.  Take a look at
http://perso.wanadoo.fr/pascal.obry/archive/flexyacc.tar.gz


----- Original Message ----- 
From: "Rajat Datta" <rajat@austin.rr.com>
Newsgroups: comp.lang.ada
To: <comp.lang.ada@ada.eu.org>
Sent: Thursday, July 26, 2001 3:30 PM
Subject: creating temporary files


> Trying to run aflex on FreeBSD 4.2 using GNAT, I am coming across the
> following problem:  in two places the aflex code attempts to create a
> temporary file using Create(Temp_File, OUT_FILE) which raises a
> USE_ERROR exception.
> 
> Any workarounds besides changing the code to explicitly create a
> temporary filename?
> 
> rajat
> _______________________________________________
> comp.lang.ada mailing list
> comp.lang.ada@ada.eu.org
> http://ada.eu.org/mailman/listinfo/comp.lang.ada
> 

Re: creating temporary files

[Rajat Datta]

On Thu, 26 Jul 2001 16:24:50 -0500,
David C. Hoos <david.c.hoos.sr@ada95.com> wrote:
>Since you didn't say what version of aflex you're using, or what version
>of GNAT, it's hard to definitively answer the question.

Sorry.

I'm using gnat-3.13p and aflex out of the link you suggested
(http://perso.wanadoo.fr/pascal.obry/archive/flexyacc.tar.gz), which
doesn't seem to have a version number, but has a file called CHANGES-1.4.

In the file main_body.adb, in procedure AFLEXINIT, around line 397,
the line
      CREATE(TEMP_ACTION_FILE, OUT_FILE);
causes a USE_ERROR exception to be raised.

I will try to rewrite the two places using temporary files with
Create_Temp_File as you suggested.  Thanks,

rajat

Re: creating temporary files

[Rajat Datta]

On Thu, 26 Jul 2001 21:53:27 +0100,
Martin Dowie <martin.m.dowie@no.spam.ntlworld.com> wrote:
>if the file already exists then you may have to "Open"
>it rather it rather than "Create" it.

No, it's a temp file.  I presume if Create() supports creating
temporary files if you specify an empty string as the name, it
will take care to avoid files that already exist.

rajat

Re: creating temporary files

[Pascal Obry]

rajat@austin.rr.com (Rajat Datta) writes:

> On Thu, 26 Jul 2001 16:24:50 -0500,
> David C. Hoos <david.c.hoos.sr@ada95.com> wrote:
> >Since you didn't say what version of aflex you're using, or what version
> >of GNAT, it's hard to definitively answer the question.
> 
> Sorry.
> 
> I'm using gnat-3.13p and aflex out of the link you suggested
> (http://perso.wanadoo.fr/pascal.obry/archive/flexyacc.tar.gz), which
> doesn't seem to have a version number, but has a file called CHANGES-1.4.
> 
> In the file main_body.adb, in procedure AFLEXINIT, around line 397,
> the line
>       CREATE(TEMP_ACTION_FILE, OUT_FILE);
> causes a USE_ERROR exception to be raised.

Ok, this seems a GNAT/FreeBSD issue since I have been able to use flex/yacc
with GNAT under Windows.

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
--|------------------------------------------------------
--|         http://perso.wanadoo.fr/pascal.obry
--|
--| "The best way to travel is by means of imagination"