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From: "Charles Sandmann" <cwsdpmi AT earthlink DOT net>
Newsgroups: comp.os.msdos.djgpp
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Subject: Re: _CRT0_FLAG_NULLOK
Date: Tue, 6 Aug 2013 21:58:51 -0500
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

"Georg Potthast" <dosusb AT googlemail DOT com> wrote in message 
news:1d5d0ab5-8e24-4149-891e-62108504529b AT googlegroups DOT com...
>I did not post further messages because I understand that the djgpp 
>developers could not be convinced to make a change here.
>As Rod pointed out with the links he provided this topic has been discussed 
>already 25 years ago and no change was made yet.

Note that I wanted NULL pointer protection so badly (for portability and 
error checking) that I added it to CWSDPMI and to the DJGPP runtime.  We all 
agreed this was the correct default behavior, but if you need to allow 
referencing NULL pointers you can use the _CRT0_FLAG_NULLOK, or launch 
cwsdpmi with the -x qualifier before your program to disable the DPMI 1.0 
extension that supports the NULL pointer detection.  It is your choice.

However, when it comes to adding code to the runtime library to encourage 
bad coding practices, every program written should not need to carry the 
extra bloat to support this, which is why it's not in the library.

>The library I am using returns NULL instead of an empty string. So I will 
>have to trap
>NULL before calling atoi() and fill the integer variable with zero then.

Good portable choice.  You could also put a #define in your code to make 
atoi() be null_ok_atoi() as a wrapper, write this function yourself to do 
the check before calling atoi().