1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" from: @(#)strsep.3 8.1 (Berkeley) 6/9/93 36.\" $NetBSD: strsep.3,v 1.10 2002/02/07 09:24:07 ross Exp $ 37.\" 38.Dd June 9, 1993 39.Dt STRSEP 3 40.Os 41.Sh NAME 42.Nm strsep 43.Nd separate strings 44.Sh LIBRARY 45.Lb libc 46.Sh SYNOPSIS 47.Fd #include \*[Lt]string.h\*[Gt] 48.Ft char * 49.Fn strsep "char **stringp" "const char *delim" 50.Sh DESCRIPTION 51The 52.Fn strsep 53function locates, in the null-terminated string referenced by 54.Fa *stringp , 55the first occurrence of any character in the string 56.Fa delim 57(or the terminating 58.Ql \e0 59character) and replaces it with a 60.Ql \e0 . 61The location of the next character after the delimiter character 62(or NULL, if the end of the string was reached) is stored in 63.Fa *stringp . 64The original value of 65.Fa *stringp 66is returned. 67.Pp 68An ``empty'' field, i.e. one caused by two adjacent delimiter characters, 69can be detected by comparing the location referenced by the pointer returned 70in 71.Fa *stringp 72to 73.Ql \e0 . 74.Pp 75If 76.Fa *stringp 77is initially 78.Dv NULL , 79.Fn strsep 80returns 81.Dv NULL . 82.Sh EXAMPLES 83The following uses 84.Fn strsep 85to parse a string, containing tokens delimited by white space, into an 86argument vector: 87.Bd -literal -offset indent 88char **ap, *argv[10], *inputstring; 89 90for (ap = argv; (*ap = strsep(\*[Am]inputstring, " \et")) != NULL;) 91 if (**ap != '\e0') 92 ++ap; 93.Ed 94.Sh HISTORY 95The 96.Fn strsep 97function 98is intended as a replacement for the 99.Fn strtok 100function. 101While the 102.Fn strtok 103function should be preferred for portability reasons (it conforms to 104.St -ansiC ) 105it is unable to handle empty fields, i.e. detect fields delimited by 106two adjacent delimiter characters, or to be used for more than a single 107string at a time. 108The 109.Fn strsep 110function first appeared in 111.Bx 4.4 . 112