100 lines
2.4 KiB
Groff
100 lines
2.4 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 October 12, 2006
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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 "const 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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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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.Sh IMPLEMENTATION NOTES
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The
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.Fn dirname
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function
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returns a pointer to internal storage space allocated on the first call
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that will be overwritten
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by subsequent calls.
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.Pp
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Other vendor implementations of
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.Fn dirname
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may modify the contents of the string passed to
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.Fn dirname ;
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this should be taken into account when writing code which calls this function
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if portability is desired.
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.Sh RETURN VALUES
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On successful completion,
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.Fn dirname
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returns a pointer to the parent directory of
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.Fa path .
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.Pp
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If
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.Fn dirname
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fails, a null pointer is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The following error codes may be set in
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.Va errno :
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.Bl -tag -width Er
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.It Bq Er ENAMETOOLONG
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The path component to be returned was larger than
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.Dv MAXPATHLEN .
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.El
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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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.Sh AUTHORS
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.An "Todd C. Miller"
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