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+.\" Copyright (c) 1990, 1991 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. 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.
+.\"
+.\"     @(#)strsep.3	5.3 (Berkeley) 4/19/91
+.\"
+.Dd April 19, 1991
+.Dt STRSEP 3
+.Os
+.Sh NAME
+.Nm strsep
+.Nd separate strings
+.Sh SYNOPSIS
+.Fd #include <string.h>
+.Ft char *
+.Fn strsep "char **stringp" "char *delim"
+.Sh DESCRIPTION
+The
+.Fn strsep
+locates in the null-terminated string at
+.Fa *stringp
+the first occurence of any character in
+.Fa delim
+and replaces this with a
+.Ql \e0 ,
+records the location of the immediate following character in
+.Fa *stringp ,
+then returns the original value of
+.Fa *stringp .
+If no delimiter characters are found,
+.Fn strsep
+sets
+.Fa *stringp
+to
+.Dv NULL ;
+if
+.Fa *stringp
+is initially
+.Dv NULL ,
+.Fn strsep
+returns
+.Dv NULL .
+.Sh EXAMPLES
+The following uses
+.Fn strsep
+to parse strings containing runs of white space,
+making up an argument vector:
+.Bd -literal -offset indent
+char inputstring[100];
+char **argv[51], **ap = argv, *p, *val;
+/* set up inputstring */
+for (p = inputstring; p != NULL; ) {
+	while ((val = strsep(&p, " \et")) != NULL && *val == '\e0');
+	*ap++ = val;
+}
+*ap = 0;
+.Ed
+.Sh HISTORY
+The
+.Fn strsep
+function is
+.Ud .