99 lines
2.8 KiB
Groff
99 lines
2.8 KiB
Groff
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.\" $NetBSD: dirname.3,v 1.14 2008/05/10 22:39:40 christos Exp $
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.\"
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.\" Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Klaus Klein and Jason R. Thorpe.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 10, 2008
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.Dt DIRNAME 3
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.Os
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.Sh NAME
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.Nm dirname
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.Nd report the parent directory name of a file pathname
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In libgen.h
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.Ft char *
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.Fn dirname "char *path"
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.Sh DESCRIPTION
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The
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.Fn dirname
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function takes a pointer to a character string that contains a pathname,
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.Ar path ,
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and returns a pointer to a string that is a pathname of the parent directory of
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.Ar path .
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Trailing
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.Sq /
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characters in
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.Ar path
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are not counted as part of the path.
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.Pp
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If
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.Ar path
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does not contain a
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.Sq / ,
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then
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.Fn dirname
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returns a pointer to the string
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.Dq \&. .
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.Pp
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If
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.Ar path
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is a null pointer or points to an empty string,
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.Fn dirname
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returns a pointer to the string
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.Dq \&. .
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.Sh RETURN VALUES
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The
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.Fn dirname
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function returns a pointer to a string that is the parent directory of
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.Ar path .
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.Sh SEE ALSO
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.Xr dirname 1 ,
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.Xr basename 3
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.Sh STANDARDS
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.Bl -bullet -compact
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.It
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.St -xpg4.2
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.It
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.St -p1003.1-2001
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.El
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.Sh BUGS
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If the length of the result is longer than
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.Dv PATH_MAX
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bytes
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.Pq including the terminating nul ,
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the result will be truncated.
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.Pp
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The
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.Fn dirname
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function returns a pointer to static storage that may be overwritten
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by subsequent calls to
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.Fn dirname .
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This is not strictly a bug; it is explicitly allowed by
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.St -p1003.1-2001 .
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