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.\" @(#)strsep.3 8.1 (Berkeley) 6/9/93 36.\" $FreeBSD$ 37.\" 38.Dd June 9, 1993 39.Dt STRSEP 3 40.Os 41.Sh NAME 42.Nm strsep 43.Nd separate strings 44.Sh SYNOPSIS 45.Fd #include <string.h> 46.Ft char * 47.Fn strsep "char **stringp" "const char *delim" 48.Sh DESCRIPTION 49The 50.Fn strsep 51function locates, in the string referenced by 52.Fa *stringp , 53the first occurrence of any character in the string 54.Fa delim 55(or the terminating 56.Ql \e0 57character) and replaces it with a 58.Ql \e0 . 59The location of the next character after the delimiter character 60(or NULL, if 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 ``empty'' field, i.e. one caused by two adjacent delimiter characters, 67can be detected by comparing the location referenced by the pointer returned 68in 69.Fa *stringp 70to 71.Ql \e0 . 72.Pp 73If 74.Fa *stringp 75is initially 76.Dv NULL , 77.Fn strsep 78returns 79.Dv NULL . 80.Sh EXAMPLES 81The following uses 82.Fn strsep 83to parse a string, containing tokens delimited by white space, into an 84argument vector: 85.Bd -literal -offset indent 86char **ap, *argv[10], *inputstring; 87 88for (ap = argv; (*ap = strsep(&inputstring, " \et")) != NULL;) 89 if (**ap != '\e0') 90 if (++ap >= &argv[10]) 91 break; 92.Ed 93.Sh HISTORY 94The 95.Fn strsep 96function 97is intended as a replacement for the 98.Fn strtok 99function. 100While the 101.Fn strtok 102function should be preferred for portability reasons (it conforms to 103.St -ansiC ) 104it is unable to handle empty fields, i.e. detect fields delimited by 105two adjacent delimiter characters, or to be used for more than a single 106string at a time. 107The 108.Fn strsep 109function first appeared in 110.Bx 4.4 . 111