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Annotation of src/lib/libc/gen/dirname.3, Revision 1.14

1.14    ! christos    1: .\"    $NetBSD: dirname.3,v 1.13 2008/04/30 13:10:50 martin Exp $
1.1       kleink      2: .\"
1.8       thorpej     3: .\" Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
1.1       kleink      4: .\" All rights reserved.
                      5: .\"
                      6: .\" This code is derived from software contributed to The NetBSD Foundation
1.8       thorpej     7: .\" by Klaus Klein and Jason R. Thorpe.
1.1       kleink      8: .\"
                      9: .\" Redistribution and use in source and binary forms, with or without
                     10: .\" modification, are permitted provided that the following conditions
                     11: .\" are met:
                     12: .\" 1. Redistributions of source code must retain the above copyright
                     13: .\"    notice, this list of conditions and the following disclaimer.
                     14: .\" 2. Redistributions in binary form must reproduce the above copyright
                     15: .\"    notice, this list of conditions and the following disclaimer in the
                     16: .\"    documentation and/or other materials provided with the distribution.
                     17: .\"
                     18: .\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     19: .\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     20: .\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     21: .\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     22: .\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     23: .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     24: .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     25: .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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1.14    ! christos   30: .Dd May 10, 2008
1.1       kleink     31: .Dt DIRNAME 3
1.3       garbled    32: .Os
1.1       kleink     33: .Sh NAME
                     34: .Nm dirname
                     35: .Nd report the parent directory name of a file pathname
1.2       perry      36: .Sh LIBRARY
                     37: .Lb libc
1.1       kleink     38: .Sh SYNOPSIS
1.10      wiz        39: .In libgen.h
1.1       kleink     40: .Ft char *
1.14    ! christos   41: .Fn dirname "char *path"
1.1       kleink     42: .Sh DESCRIPTION
                     43: The
                     44: .Fn dirname
                     45: function takes a pointer to a character string that contains a pathname,
                     46: .Ar path ,
                     47: and returns a pointer to a string that is a pathname of the parent directory of
                     48: .Ar path .
1.9       wiz        49: Trailing
                     50: .Sq /
                     51: characters in
1.1       kleink     52: .Ar path
                     53: are not counted as part of the path.
                     54: .Pp
                     55: If
                     56: .Ar path
1.9       wiz        57: does not contain a
                     58: .Sq / ,
                     59: then
1.1       kleink     60: .Fn dirname
1.9       wiz        61: returns a pointer to the string
                     62: .Dq \&. .
1.1       kleink     63: .Pp
                     64: If
                     65: .Ar path
                     66: is a null pointer or points to an empty string,
                     67: .Fn dirname
1.9       wiz        68: returns a pointer to the string
                     69: .Dq \&. .
1.1       kleink     70: .Sh RETURN VALUES
                     71: The
                     72: .Fn dirname
                     73: function returns a pointer to a string that is the parent directory of
                     74: .Ar path .
                     75: .Sh SEE ALSO
1.11      kleink     76: .Xr dirname 1 ,
1.1       kleink     77: .Xr basename 3
                     78: .Sh STANDARDS
                     79: .Bl -bullet -compact
1.5       wiz        80: .It
1.1       kleink     81: .St -xpg4.2
1.8       thorpej    82: .It
                     83: .St -p1003.1-2001
1.5       wiz        84: .El
1.1       kleink     85: .Sh BUGS
1.8       thorpej    86: If the length of the result is longer than
                     87: .Dv PATH_MAX
                     88: bytes
                     89: .Pq including the terminating nul ,
                     90: the result will be truncated.
                     91: .Pp
1.1       kleink     92: The
                     93: .Fn dirname
1.8       thorpej    94: function returns a pointer to static storage that may be overwritten
                     95: by subsequent calls to
                     96: .Fn dirname .
                     97: This is not strictly a bug; it is explicitly allowed by
                     98: .St -p1003.1-2001 .

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