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/strsep.3

@@ -0,0 +1,120 @@
+.\" 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: @(#)strsep.3	8.1 (Berkeley) 6/9/93
+.\"	$NetBSD: strsep.3,v 1.19 2006/10/16 08:48:45 wiz Exp $
+.\"
+.Dd August 12, 2006
+.Dt STRSEP 3
+.Os
+.Sh NAME
+.Nm strsep ,
+.Nm stresep
+.Nd separate strings
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In string.h
+.Ft char *
+.Fn strsep "char **stringp" "const char *delim"
+.Ft char *
+.Fn stresep "char **stringp" "const char *delim" "int escape"
+.Sh DESCRIPTION
+The
+.Fn strsep
+function locates, in the nul-terminated string referenced by
+.Fa *stringp ,
+the first occurrence of any character in the string
+.Fa delim
+(or the terminating
+.Ql \e0
+character) and replaces it with a
+.Ql \e0 .
+The location of the next character after the delimiter character
+(or
+.Dv NULL ,
+if the end of the string was reached) is stored in
+.Fa *stringp .
+The original value of
+.Fa *stringp
+is returned.
+.Pp
+An
+.Dq empty
+field, i.e., one caused by two adjacent delimiter characters,
+can be detected by comparing the location referenced by the pointer returned
+by
+.Fn strsep
+to
+.Ql \e0 .
+.Pp
+If
+.Fa *stringp
+is initially
+.Dv NULL ,
+.Fn strsep
+returns
+.Dv NULL .
+The
+.Fn stresep
+function also takes an escape character that allows quoting the delimiter
+character so that it can be part of the source string.
+.Sh EXAMPLES
+The following uses
+.Fn strsep
+to parse a string, containing tokens delimited by white space, into an
+argument vector:
+.Bd -literal -offset indent
+char **ap, *argv[10], *inputstring;
+
+for (ap = argv; ap \*[Lt] \*[Am]argv[9] \*[Am]\*[Am]
+    (*ap = strsep(\*[Am]inputstring, " \et")) != NULL;) {
+	if (**ap != '\e0')
+		ap++;
+}
+.Ed
+.Sh HISTORY
+The
+.Fn strsep
+function
+is intended as a replacement for the
+.Fn strtok
+function.
+While the
+.Fn strtok
+function should be preferred for portability reasons (it conforms to
+.St -ansiC )
+it is unable to handle empty fields, i.e., detect fields delimited by
+two adjacent delimiter characters, or to be used for more than a single
+string at a time.
+The
+.Fn strsep
+function first appeared in
+.Bx 4.4 .