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Date: Thu, 05 Dec 2013 14:52:19 +0100
From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
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To: djgpp AT delorie DOT com
Subject: Re: Question about different behavior of fclose/fread on plain dos
 and windows.
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Reply-To: djgpp AT delorie DOT com

Am 05.12.2013 12:24, schrieb Rod Pemberton:
> On Wed, 04 Dec 2013 21:55:44 -0500, Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de> wrote:
>
>> I do not have OpenWATCOM or other dos compilers to compare against DJGPP.
>>
>
> I tested OpenWatcom v1.3.  I don't have newer v1.7 or current v.1.9
> installed.  I tested the code as 16-bit (wcl/l=dos) and 32-bit
> (wcl386/l=dos4g), in real-mode MS-DOS v7.10 and Window SE DOS console,
> and without file.txt, with file.txt, with file.txt where 'pipapo' was
> changed to 'zzzzzz'.  So, that's total of 12 tests.
>
> OW returned in all cases:
>
> fwrite(fw) OK (7): pipapo
> fread(fr) OK (0):
> fread(fr) OK (7): pipapo
>
>
> Rod Pemberton

In that case I fear we are seeing a bug.
I have used the following batch file to check
all windows and dos versions available to me:

-----------------------------------------------
del *.txt

: Compiled with 2.03
a3 > a3.txt
sed "s/pipapo/qwertz123/" file.txt > file
mv -vf file file.txt
a3 >> a3.txt
del file.txt

: Compiled with 2.04
a4 > a4.txt
sed "s/pipapo/qwertz123/" file.txt > file
mv -vf file file.txt
a4 >> a4.txt
del file.txt

: Compiled with CVS repository code
a5 > a5.txt
sed "s/pipapo/qwertz123/" file.txt > file
mv -vf file file.txt
a5 >> a5.txt
del file.txt
-----------------------------------------------


All results are identical on all systems.  I will
print only the result for a5 (Compiled with CVS
repository code).  The only difference to the other
results is that they do not have "before" and after"
entries:


Win98SE
before: 0
after: 0
before: 0
after: 0
fwrite(fw) OK (7): pipapo
fread(fr) OK (0):
fread(fr) OK (7): pipapo
before: 10
after: 0
before: 0
after: 0
fwrite(fw) OK (7): pipapo
fread(fr) OK (0):
fread(fr) OK (7): pipapo

MSDOS 7.1
before: 0
after: 0
before: 0
after: 0
fwrite(fw) OK (7): pipapo
fread(fr) OK (0):
fread(fr) KO (0):
before: 10
after: 0
before: 10
after: 10
fwrite(fw) OK (7): pipapo
fread(fr) KO (7): qwertz1 AT k

@
fread(fr) OK (7): qwertz1 AT k

@


The bottom line is again, all windows versions work, all dos versions fail.


Regards,
Juan M. Guerrero