realloc() (was: Re: Safe coding practices)

[Mark Moraes]

>From the Seventh Edition manual page for malloc(3):
> BUGS
>      When realloc returns 0, the block pointed to by ptr  may  be
>      destroyed.

[This exists in the Eighth and Tenth Edition manuals as well, also
 the 4.3Reno manuals]

So one can't portably rely on the contents of the block being
realloced if the realloc failed.  On the other hand, this behaviour is
clearly marked a bug as far back as V7.

	Mark.