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xcalloc / xmalloc

From: John Darrington
Subject: xcalloc / xmalloc
Date: Mon, 23 May 2005 18:29:15 +0800
User-agent: Mutt/1.5.6+20040907i

alloc.c contains a function called xcalloc, which is like xmalloc except that
it initialises it's memory to zero.  

I suggest that we 

1.  Rename xcalloc to something like zmalloc.

2.  Implement an xcalloc function which wraps calloc, in the same way that
    xmalloc wraps malloc. 

3.  Prefer the new xcalloc where appropriate.  Ie: rather than:

        xmalloc(n_things * sizeof *things);


        xcalloc(n_things, sizeof *things);

    The former raises the possibility of integer overflow and hence buffer 
    overrun.  In the latter case, we have more opportunity for bounds checking.


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