.\" 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
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.\"    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.
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.\"     from: @(#)strsep.3	5.3 (Berkeley) 4/19/91
.\"	$Id: strsep.3,v 1.2 1993/08/01 07:43:41 mycroft Exp $
.\"
.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 .