86 lines
2.5 KiB
Groff
86 lines
2.5 KiB
Groff
.\" $NetBSD: reallocarr.3,v 1.3 2015/02/19 23:08:21 wiz Exp $
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.\"
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.\" Copyright (c) 2015 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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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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.\"
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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
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.Dd February 19, 2015
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.Dt REALLOCARR 3
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.Os
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.Sh NAME
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.Nm reallocarr
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.Nd reallocate array
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.Sh SYNOPSIS
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.In stdlib.h
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.Ft int
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.Fo reallocarr
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.Fa "void *ptr"
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.Fa "size_t num"
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.Fa "size_t size"
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.Fc
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.Sh DESCRIPTION
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The
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.Nm
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function reallocates the memory in
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.Fa *ptr .
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.Sh RETURN VALUES
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On successful completion,
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.Fn
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returns 0 and updates
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.Fa *ptr .
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Otherwise, an error code (see
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.Xr errno 2 )
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is returned and
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.Fa *ptr
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and the referenced memory is unmodified.
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.Sh EXAMPLES
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The following uses
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.Fn reallocarr
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to initialize an array of INITSIZE integers, then
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resizes it to NEWSIZE elements:
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.Bd -literal -offset indent
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int *data = NULL;
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int ret = 0;
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ret = reallocarr(&data, INITSIZE, sizeof(*data));
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if (ret)
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errc(1, ret, "reallocarr failed");
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ret = reallocarr(&data, NEWSIZE, sizeof(*data));
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if (ret)
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errc(1, ret, "reallocarr failed on resize");
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.Ed
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.Sh SEE ALSO
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.Xr calloc 3
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.Sh HISTORY
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.Nm
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first appeared in
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.Nx 7.0 .
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.Ox
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introduced the
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.Xr reallocarray 3
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function for the same purpose, but the interface makes it difficult
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to correctly handle zero-sized allocations.
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