.\" .\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. The name of the author may not be used to endorse or promote products .\" derived from this software without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, .\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY .\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL .\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, .\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, .\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; .\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, .\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF .\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .\" $OpenBSD: dirname.3,v 1.9 2000/04/18 03:01:25 aaron Exp $ .\" $FreeBSD: src/lib/libc/gen/dirname.3,v 1.4 2001/10/01 16:08:50 ru Exp $ .\" .Dd August 17, 1997 .Dt DIRNAME 3 .Os .Sh NAME .Nm dirname .Nd extract the directory portition of a pathname .Sh SYNOPSIS .In libgen.h .Ft char * .Fn dirname "const char *path" .Sh DESCRIPTION The .Fn dirname function is the converse of .Xr basename 3 ; it returns a pointer to the parent directory of the pathname pointed to by .Ar path . Any trailing .Sq \&/ characters are not counted as part of the directory name. If .Ar path is a null pointer, the empty string, or contains no .Sq \&/ characters, .Fn dirname returns a pointer to the string .Qq \&. , signifying the current directory. .Sh RETURN VALUES On successful completion, .Fn dirname returns a pointer to the parent directory of .Ar path . .Pp If .Fn dirname fails, a null pointer is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS The following error codes may be set in .Va errno : .Bl -tag -width Er .It Bq Er ENAMETOOLONG The path component to be returned was larger than .Dv MAXPATHLEN . .El .Sh WARNINGS .Fn dirname returns a pointer to internal static storage space that will be overwritten by subsequent calls (each function has its own separate storage). .Pp Other vendor implementations of .Fn dirname may modify the contents of the string passed to .Fn dirname ; this should be taken into account when writing code which calls this function if portability is desired. .Sh SEE ALSO .Xr basename 1 , .Xr dirname 1 , .Xr basename 3 .Sh STANDARDS The .Fn dirname function conforms to .St -xpg4.2 . .Sh HISTORY The .Fn dirname function first appeared in .Ox 2.2 and .Fx 4.2 . .Sh AUTHORS Todd C. Miller <Todd.Miller@courtesan.com>