Re: Understanding {$I-} {$I+} ioResult

On 26 Nov 2012 at 14:59, Baudouin Le Charlier wrote:

> 
> Le 26 nov. 2012 à 12:39, Prof. A Olowofoyeku (The African Chief) a
> écrit :
> 
> > On 26 Nov 2012 at 9:10, Baudouin Le Charlier wrote:
> > 
> > [...]
> >>> This is a historical factor, and there was no need to duplicate
> >>> features that Borland already documented well, and which were well
> >>> known to Borland Pascal/Delphi programmers.
> >> 
> >> I am not sure they are so well known since you did not explain to
> >> me why (i.e. by which miracle) a program that stops abruptly (when
> >> compiled with $I-), stops normally if you add a call to ioResult
> >> *after* the io statement that makes the original program fail. I
> >> doubt very much that this could be explained in the original
> >> Borland documentation and also that this behavior should be well
> >> known of Borland Pascal programmers.
> > 
> > As I said, the Borland Pascal/Delphi help files are freely available
> > on the net. If you want to use Borland Pascal/Delphi compatibility
> > features in GPC, you would do well to study the Borland
> > documentation on those features.
> > 
> > This is from a 20 year old Borland Turbo Pascal help file:
> > 
> > [--- excerpt begins ---]
> > $I:  Input/Output-Checking Switch
> > Enables or disables the automatic code generation that checks the
> > result of a call to an I/O procedure 
> > 
> > Syntax:	$I+ or $I-
> > Default:	$I+
> > Type:	Local
> > Command-Line:	/$I+ or /$I-
> > Menu Command:	Options|Compiler|I/O Checking
> > 
> > Remarks
> > If an I/O procedure returns a non-zero I/O result when the $I switch
> > is on, the program terminates, displaying a run-time error message. 
> > 
> > 
> > When the $I switch is off, you must use the IOResult function to
> > check for I/O errors. [--- excerpt ends ---]
> > 
> > Please let us stop this meaningless debate now.
> 
> To me, it is not meaningless. I sent you an example where gnu pascal
> does not conform to the excerpt you just sent me : the program is
> compiled with the switch off but nevertheless it stops with an error
> message. 

And where in that code did you use the IOResult function to check for 
errors?

Best regards,  
 The Chief
-------
Prof. Abimbola Olowofoyeku (The African Chief)
Web: http://www.greatchief.plus.com



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