Re: [PATCHES] fix memcpy() overlap

[Andrew Dunstan]

Stephan Szabo wrote:

On Mon, 2 Feb 2004, Tom Lane wrote:

 

Neil Conway <[EMAIL PROTECTED]> writes:
   

I don't know of a memcpy() implementation that would actually bail out
if called with two equal pointers, but perhaps there is one in
existence somewhere.
     

This isn't a bug, and I see no reason to clutter the code just to shut
up valgrind.
   

Isn't memcpy on overlapping (even entirely overlapping) buffers undefined
behavior unless the count is 0?
 

On my Linux box the man page says:

DESCRIPTION
      The  memcpy()  function  copies  n bytes from memory area src to 
memory
      area dest.  The memory areas may not overlap.  Use  memmove(3)  
if  the
      memory areas do overlap.

cheers

andrew

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