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From: kchen@imagen.UUCP (Kok Chen)
Newsgroups: comp.os.minix
Subject: Problem with Minix C compiler?
Message-ID: <1391@imagen.UUCP>
Date: Mon, 24-Aug-87 12:30:47 EDT
Article-I.D.: imagen.1391
Posted: Mon Aug 24 12:30:47 1987
Date-Received: Tue, 25-Aug-87 07:15:56 EDT
Organization: Imagen Corp., Santa Clara CA
Lines: 25

Has anyone else noticed a bug(?) in the C compiler in returning NULL?

Example:
    |		typedef struct { int member; /* etc */ } STRUCT ;
    |
    |		STRUCT *function()
    |		{
    |		    STRUCT *p ;
    |
    |		    p = (STRUCT *) NULL ;
    |		    return p ;
    |
    |		    return (STRUCT *) NULL ;
    |		}

The first form of return works properly, but the second form does not.  
(I.e., the value of the function using the second return, when compared 
with NULL, will result in a false condition.)

No big thing, since it is easy to work around.  But it can (and did) cause 
a lot of pain until one is aware of it :-)


Kok S. Chen				..!decwrl!imagen!kchen
Imagen Corporation