@node xrealloc, memory
@subheading Syntax

@example
#include <stdlib.h>

void *xrealloc(void *ptr, size_t size);
@end example

@subheading Description

This function is just like @code{realloc} (@pxref{realloc}), except that
if there is no more memory, it prints an error message and exits.  It
can also properly handle @var{ptr} being @code{NULL}. 

Note that, currently, the header @file{stdlib.h} does @strong{not}
declare a prototype for @code{xrealloc}, because many programs declare
its prototype in different and conflicting ways.  If you use
@code{xrealloc} in your own code, you might need to provide your own
prototype explicitly.

@subheading Return Value

A pointer to a possibly new block.

@subheading Portability

@portability !ansi, !posix

@subheading Example

@example
char *buf;
buf = (char *)xrealloc(buf, new_size);
@end example