Import XPG4-compliant basename(3) and dirname(3) from OpenBSD.

The man pages need some adjustments.

PR:		12960, 12962
Submitted by:	James Howard <howardjp@wam.umd.edu>
Obtained from:	OpenBSD

1 files changed, 99 insertions, 0 deletions

diff --git a/lib/libc/gen/basename.3 b/lib/libc/gen/basename.3
new file mode 100644
index 0000000..7ed2b1f
--- /dev/null
+++ b/lib/libc/gen/basename.3
@@ -0,0 +1,99 @@
+.\"
+.\" 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: basename.3,v 1.12 2000/04/18 03:01:25 aaron Exp $
+.\" $FreeBSD$
+.\"
+.Dd August 17, 1997
+.Dt BASENAME 3
+.Os
+.Sh NAME
+.Nm basename
+.Nd extract the base portion of a pathname
+.Sh SYNOPSIS
+.Fd #include <libgen.h>
+.Ft char *
+.Fn basename "const char *path"
+.Sh DESCRIPTION
+The
+.Fn basename
+function
+returns the last component from the pathname pointed to by
+.Ar path ,
+deleting any trailing
+.Sq \&/
+characters.
+If
+.Ar path
+consists entirely of
+.Sq \&/
+characters, a pointer to the string
+.Qq \&/
+is returned.
+If
+.Ar path
+is a null pointer or the empty string, a pointer to the string
+.Qq \&.
+is returned.
+.Sh RETURN VALUES
+On successful completion,
+.Fn basename
+returns a pointer to the last component of
+.Ar path .
+.Pp
+If
+.Fn basename
+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 basename
+returns a pointer to internal static storage space that will be overwritten
+by subsequent calls.
+.Sh SEE ALSO
+.Xr basename 1 ,
+.Xr dirname 1 ,
+.Xr dirname 3
+.Sh STANDARDS
+The
+.Fn basename
+function conforms to
+.St -xpg4.2 .
+.Sh HISTORY
+The
+.Fn basename
+function first appeared in
+.Ox 2.2 .
+.Sh AUTHOR
+Todd C. Miller <Todd.Miller@courtesan.com>