Subj : Old C-program
To   : borland.public.cpp.borlandcpp
From : Vladimir Grigoriev
Date : Tue Oct 11 2005 02:07 pm

Hi.
I get an old-style C program and cannot understand some code.
Here it is.

typedef struct BlockEntry
{
      struct BlockEntry * next;
      char  name[4];
      unsigned long key;
      int lock;
} BEntry;


int SomeFunction( bentry )
BEntry * bentry;
{
        unsigned long key;

        if ((char *) bentry == NULL )
           key = ONE_CONSTANT;
        else
           key = ANOTHER_CONSTANT;

/* some code that I have skipped */

       bentry->key = key;

       return 0;
}

I cannot understand the following code
if ((char *) bentry == NULL )
What did a programmer want to say?
Is the value of (char *)bentry is different form the value of bentry?

Vladimir Grigoriev
vlad.moscow@mail.ru

.