From owner-freebsd-chat  Wed Aug  9 23:53: 5 2000
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Date: Wed, 9 Aug 2000 23:52:53 -0700
From: Alfred Perlstein <bright@wintelcom.net>
To: "Thomas M. Sommers" <tms2@mail.ptd.net>
Cc: Mark Ovens <marko@FreeBSD.ORG>, chat@FreeBSD.ORG
Subject: Re: C time functions - problem
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* Thomas M. Sommers <tms2@mail.ptd.net> [000809 22:31] wrote:
> Alfred Perlstein wrote:
> > 
> > * Thomas M. Sommers <tms2@mail.ptd.net> [000808 17:46] wrote:
> > > Alfred Perlstein wrote:
> > > >
> > > > Don't cast 0 to a pointer type, use NULL.
> > >
> > > Or just use 0.
> > 
> > Not if you want me to accept the code.
> 
> According to the (draft) standard,  section 6.3.2.3:
> 
> "An integer constant expression with the value 0, or such an expression
> cast to type void *, is called a null pointer constant. If a null
> pointer constant is converted to a pointer type, the resulting pointer,
> called a null pointer, is guaranteed to compare unequal to a pointer to
> any object or function."
> 
> There are very few circumstances in which you need to cast 0 to make it
> a null pointer constant.

That's not the point, the point is if you want _me_ to accept the
code you better be using 0/NULL/'\0' like so:

char x = '\0';
int  *y = NULL;
int  z = 0;

If you want to run code that does it a different way past someone
else that's fine by me.  I was merely stating my preference on the
correct usage of NULL/0/nul.

-Alfred


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