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+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" 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. 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
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+.\" 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.
+.\"
+.\"     @(#)malloc.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD: src/lib/libc/stdlib/malloc.3,v 1.80.2.2.2.1 2010/06/14 02:09:06 kensmith Exp $
+.\"
+.Dd September 26, 2009
+.Dt MALLOC 3
+.Os
+.Sh NAME
+.Nm reallocf
+.Nd general purpose memory allocation functions
+.Sh LIBRARY
+.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
+.Lb libbsd
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft void *
+.Fn reallocf "void *ptr" "size_t size"
+.Sh DESCRIPTION
+The
+.Fn reallocf
+function changes the size of the previously allocated memory referenced by
+.Fa ptr
+to
+.Fa size
+bytes.
+The contents of the memory are unchanged up to the lesser of the new and
+old sizes.
+If the new size is larger,
+the contents of the newly allocated portion of the memory are undefined.
+Upon success, the memory referenced by
+.Fa ptr
+is freed and a pointer to the newly allocated memory is returned.
+Note that
+.Fn reallocf
+may move the memory allocation, resulting in a different return value than
+.Fa ptr .
+If
+.Fa ptr
+is
+.Dv NULL ,
+the
+.Fn reallocf
+function behaves identically to
+.Fn malloc
+for the specified size.
+Upon failure, when the requested memory cannot be allocated, the passed pointer
+is freed to ease the problems with traditional coding styles for
+.Fn reallocf
+causing memory leaks in libraries.
+.Sh RETURN VALUES
+The
+.Fn reallocf
+function returns a pointer, possibly identical to
+.Fa ptr ,
+to the allocated memory
+if successful; otherwise a
+.Dv NULL
+pointer is returned, and
+.Va errno
+is set to
+.Er ENOMEM
+if the error was the result of an allocation failure.
+The buffer is deallocated in this case.
+.Sh SEE ALSO
+.Xr brk 2 ,
+.Xr mmap 2 ,
+.Xr alloca 3 ,
+.Xr calloc 3 ,
+.Xr free 3 ,
+.Xr malloc 3 ,
+.Xr posix_memalign 3 ,
+.Xr realloc 3 ,
+.Sh HISTORY
+The
+.Fn reallocf
+function first appeared in
+.Fx 3.0 .