Import unmodified NetBSD libc in trunk

This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.

lib/nbsd_libc/string/rindex.3

@@ -0,0 +1,97 @@
+.\" Copyright (c) 1990, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Chris Torek.
+.\" 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. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+.\"
+.\"     from: @(#)rindex.3	8.1 (Berkeley) 6/4/93
+.\"	$NetBSD: rindex.3,v 1.12 2010/04/29 06:54:26 jruoho Exp $
+.\"
+.Dd April 29, 2010
+.Dt RINDEX 3
+.Os
+.Sh NAME
+.Nm rindex
+.Nd locate character in string
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In strings.h
+.Ft char *
+.Fn rindex "const char *s" "int c"
+.Sh DESCRIPTION
+The
+.Fn rindex
+function
+locates the last character
+matching
+.Fa c
+(converted to a
+.Em char )
+in the nul-terminated string
+.Fa s .
+.Sh RETURN VALUES
+A pointer to the character is returned if it is found; otherwise
+.Dv NULL
+is returned.
+If
+.Fa c
+is
+.Ql \e0 ,
+.Fn rindex
+locates the terminating
+.Ql \e0 .
+.Sh SEE ALSO
+.Xr index 3 ,
+.Xr memchr 3 ,
+.Xr strchr 3 ,
+.Xr strcspn 3 ,
+.Xr strpbrk 3 ,
+.Xr strrchr 3 ,
+.Xr strsep 3 ,
+.Xr strspn 3 ,
+.Xr strstr 3 ,
+.Xr strtok 3
+.Sh STANDARDS
+The
+.Fn rindex
+function conforms to
+.St -p1003.1-2001 .
+The
+.St -p1003.1-2004
+revision marked it as legacy and recommended the use of
+.Xr strrchr 3
+instead.
+The
+.St -p1003.1-2008
+revision removed
+.Fn rindex
+from the specification.
+.Sh HISTORY
+A
+.Fn rindex
+function appeared in
+.At v6 .