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. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" from: @(#)strsep.3 8.1 (Berkeley) 6/9/93 32.\" $NetBSD: strsep.3,v 1.16 2004/04/13 23:03:22 wiz Exp $ 33.\" 34.Dd August 11, 2002 35.Dt STRSEP 3 36.Os 37.Sh NAME 38.Nm strsep 39.Nd separate strings 40.Sh LIBRARY 41.Lb libc 42.Sh SYNOPSIS 43.In string.h 44.Ft char * 45.Fn strsep "char **stringp" "const char *delim" 46.Sh DESCRIPTION 47The 48.Fn strsep 49function locates, in the null-terminated string referenced by 50.Fa *stringp , 51the first occurrence of any character in the string 52.Fa delim 53(or the terminating 54.Ql \e0 55character) and replaces it with a 56.Ql \e0 . 57The location of the next character after the delimiter character 58(or 59.Dv NULL , 60if the end of the string was reached) is stored in 61.Fa *stringp . 62The original value of 63.Fa *stringp 64is returned. 65.Pp 66An 67.Dq empty 68field, i.e., one caused by two adjacent delimiter characters, 69can be detected by comparing the location referenced by the pointer returned 70by 71.Fn strsep 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 < \*[Am]argv[9] \*[Am]\*[Am] 91 (*ap = strsep(\*[Am]inputstring, " \et")) != NULL;) { 92 if (**ap != '\e0') 93 ap++; 94} 95.Ed 96.Sh HISTORY 97The 98.Fn strsep 99function 100is intended as a replacement for the 101.Fn strtok 102function. 103While the 104.Fn strtok 105function should be preferred for portability reasons (it conforms to 106.St -ansiC ) 107it is unable to handle empty fields, i.e., detect fields delimited by 108two adjacent delimiter characters, or to be used for more than a single 109string at a time. 110The 111.Fn strsep 112function first appeared in 113.Bx 4.4 . 114