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+.\" Copyright (c) 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)realloc.3	5.1 (Berkeley) 5/2/91
+.\"	$Id: realloc.3,v 1.1.1.1 1995/10/18 08:42:19 deraadt Exp $
+.\"
+.Dd May 2, 1991
+.Dt REALLOC 3
+.Os
+.Sh NAME
+.Nm realloc
+.Nd reallocation of memory function
+.Sh SYNOPSIS
+.Fd #include <stdlib.h>
+.Ft void *
+.Fn realloc "void *ptr" "size_t size"
+.Sh DESCRIPTION
+The
+.Fn realloc
+function changes the size of the object pointed to by
+.Fa ptr
+to the size specified by
+.Fa size .
+The contents of the object are unchanged up to the lesser
+of the new and old sizes.
+If the new size is larger, the value of the newly allocated portion
+of the object is indeterminate.
+If
+.Fa ptr
+is a null pointer, the
+.Fn realloc
+function behaves like the
+.Xr malloc 3
+function for the specified size.
+Otherwise, if
+.Fa ptr
+does not match a pointer earlier returned by the
+.Xr calloc 3 ,
+.Xr malloc 3 ,
+or 
+.Fn realloc
+function, or if the space has been deallocated
+by a call to the
+.Xr free
+or
+.Fn realloc
+function, unpredictable and usually detrimental
+behavior will occur.
+If the space cannot be allocated, the object 
+pointed to by
+.Fa ptr
+is unchanged.
+If
+.Fa size
+is zero and
+.Fa ptr
+is not a null pointer, the object it points to is freed.
+.Pp
+The
+.Fn realloc
+function returns either a null pointer or a pointer
+to the possibly moved allocated space.
+.Sh SEE ALSO
+.Xr alloca 3 ,
+.Xr calloc 3 ,
+.Xr free 3 ,
+.Xr malloc 3 ,
+.Sh STANDARDS
+The
+.Fn realloc
+function conforms to
+.St -ansiC .