1.\" $OpenBSD: dirname.3,v 1.17 2007/05/31 19:19:28 jmc Exp $ 2.\" 3.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.\" $FreeBSD$ 18.\" 19.Dd September 5, 2016 20.Dt DIRNAME 3 21.Os 22.Sh NAME 23.Nm dirname 24.Nd extract the directory part of a pathname 25.Sh SYNOPSIS 26.In libgen.h 27.Ft char * 28.Fn dirname "char *path" 29.Sh DESCRIPTION 30The 31.Fn dirname 32function is the converse of 33.Xr basename 3 ; 34it returns a pointer to the parent directory of the pathname pointed to by 35.Fa path . 36Any trailing 37.Sq \&/ 38characters are not counted as part of the directory 39name. 40.Sh IMPLEMENTATION NOTES 41This implementation of 42.Fn dirname 43uses the buffer provided by the caller to store the resulting parent 44directory. 45Other vendor implementations may return a pointer to internal storage 46space instead. 47The advantage of the former approach is that it ensures thread-safety, 48while also placing no upper limit on the supported length of the 49pathname. 50.Sh RETURN VALUES 51If 52.Fa path 53is a null pointer, the empty string, or contains no 54.Sq \&/ 55characters, 56.Fn dirname 57returns a pointer to the string 58.Qq \&. , 59signifying the current directory. 60Otherwise, 61it returns a pointer to the parent directory of 62.Fa path . 63.Sh SEE ALSO 64.Xr basename 1 , 65.Xr dirname 1 , 66.Xr basename 3 67.Sh STANDARDS 68The 69.Fn dirname 70function conforms to 71.St -xpg4.2 . 72.Sh HISTORY 73The 74.Fn dirname 75function first appeared in 76.Ox 2.2 77and 78.Fx 4.2 . 79.Pp 80In 81.Fx 12.0 , 82this function was reimplemented to store its result in the provided 83input buffer. 84.Sh AUTHORS 85.An Nuxi, the Netherlands 86