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xrealloc
========

Syntax
------

     #include <stdlib.h>
     
     void *xrealloc(void *ptr, size_t size);

Description
-----------

This function is just like `realloc' (realloc:.), except that if   
there is no more memory, it prints an error message and exits.  It can
also properly handle PTR being `NULL'.

Return Value
------------

A pointer to a possibly new block.

Example
-------

     char *buf;
     buf = (char *)xrealloc(buf, new_size);