fd85bff53e
It turns out that the path normalization that our brand new copy of dirname(3) does is actually not allowed by the draft version of the upcoming version of POSIX. It has to behave identically to the dirname(1) utility. This change replaces our new dirname(3) implementation by yet another version that doesn't implement the path normalization logic; it merely looks for the end of the directory name and overwrites that with a null byte. More details: See note #3370 at http://austingroupbugs.net/view.php?id=1073 PR: 212193 Reviewed by: emaste, jilles Differential Revision: https://reviews.freebsd.org/D7790
86 lines
2.2 KiB
Groff
86 lines
2.2 KiB
Groff
.\" $OpenBSD: dirname.3,v 1.17 2007/05/31 19:19:28 jmc Exp $
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.\"
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.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 5, 2016
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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 extract the directory part of a pathname
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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 is the converse of
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.Xr basename 3 ;
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it returns a pointer to the parent directory of the pathname pointed to by
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.Fa path .
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Any trailing
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.Sq \&/
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characters are not counted as part of the directory
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name.
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.Sh RETURN VALUES
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If
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.Fa path
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is a null pointer, the empty string, or contains no
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.Sq \&/
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characters,
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.Fn dirname
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returns a pointer to the string
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.Qq \&. ,
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signifying the current directory.
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Otherwise,
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it returns a pointer to the parent directory of
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.Fa path .
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.Sh IMPLEMENTATION NOTES
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This implementation of
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.Fn dirname
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uses the buffer provided by the caller to store the resulting parent
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directory.
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Other vendor implementations may return a pointer to internal storage
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space instead.
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The advantage of the former approach is that it ensures thread-safety,
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while also placing no upper limit on the supported length of the
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pathname.
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.Sh SEE ALSO
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.Xr basename 1 ,
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.Xr dirname 1 ,
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.Xr basename 3
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.Sh STANDARDS
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The
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.Fn dirname
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function conforms to
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.St -xpg4.2 .
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.Sh HISTORY
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The
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.Fn dirname
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function first appeared in
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.Ox 2.2
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and
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.Fx 4.2 .
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.Pp
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In
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.Fx 12.0 ,
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this function was reimplemented to store its result in the provided
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input buffer.
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.Sh AUTHORS
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.An Nuxi, the Netherlands
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