2010-07-30 08:00:41 +02:00
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)malloc.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD: src/lib/libc/stdlib/malloc.3,v 1.80.2.2.2.1 2010/06/14 02:09:06 kensmith Exp $
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.\"
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.Dd September 26, 2009
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2022-08-03 02:21:16 +02:00
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.Dt reallocf 3bsd
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2010-07-30 08:00:41 +02:00
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.Os
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.Sh NAME
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.Nm reallocf
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.Nd general purpose memory allocation functions
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.Sh LIBRARY
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.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
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2019-06-13 23:36:09 +02:00
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.ds doc-str-Lb-libbsd \*[str-Lb-libbsd]
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2010-07-30 08:00:41 +02:00
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.Lb libbsd
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.Sh SYNOPSIS
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2017-06-05 06:33:47 +02:00
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.In stdlib.h
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(See
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.Xr libbsd 7
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for include usage.)
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2010-07-30 08:00:41 +02:00
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.Ft void *
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.Fn reallocf "void *ptr" "size_t size"
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.Sh DESCRIPTION
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The
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.Fn reallocf
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function changes the size of the previously allocated memory referenced by
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.Fa ptr
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to
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.Fa size
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bytes.
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The contents of the memory are unchanged up to the lesser of the new and
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old sizes.
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If the new size is larger,
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the contents of the newly allocated portion of the memory are undefined.
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Upon success, the memory referenced by
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.Fa ptr
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is freed and a pointer to the newly allocated memory is returned.
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Note that
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.Fn reallocf
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may move the memory allocation, resulting in a different return value than
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.Fa ptr .
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If
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.Fa ptr
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is
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.Dv NULL ,
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the
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.Fn reallocf
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function behaves identically to
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.Fn malloc
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for the specified size.
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Upon failure, when the requested memory cannot be allocated, the passed pointer
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is freed to ease the problems with traditional coding styles for
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.Fn reallocf
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causing memory leaks in libraries.
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.Sh RETURN VALUES
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The
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.Fn reallocf
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function returns a pointer, possibly identical to
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.Fa ptr ,
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to the allocated memory
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if successful; otherwise a
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.Dv NULL
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pointer is returned, and
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.Va errno
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is set to
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.Er ENOMEM
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if the error was the result of an allocation failure.
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The buffer is deallocated in this case.
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.Sh SEE ALSO
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.Xr brk 2 ,
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.Xr mmap 2 ,
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.Xr alloca 3 ,
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.Xr calloc 3 ,
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.Xr free 3 ,
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.Xr malloc 3 ,
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.Xr posix_memalign 3 ,
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.Xr realloc 3 ,
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.Sh HISTORY
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The
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.Fn reallocf
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function first appeared in
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.Fx 3.0 .
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