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.\" 37.Dd June 9, 1993 38.Dt STRSEP 3 39.Os 40.Sh NAME 41.Nm strsep 42.Nd separate strings 43.Sh SYNOPSIS 44.Fd #include <string.h> 45.Ft char * 46.Fn strsep "char **stringp" "const char *delim" 47.Sh DESCRIPTION 48The 49.Fn strsep 50function locates, in the string referenced by 51.Fa *stringp , 52the first occurrence of any character in the string 53.Fa delim 54(or the terminating 55.Ql \e0 56character) and replaces it with a 57.Ql \e0 . 58The location of the next character after the delimiter character 59(or NULL, if the end of the string was reached) is stored in 60.Fa *stringp . 61The original value of 62.Fa *stringp 63is returned. 64.Pp 65An ``empty'' field, i.e. one caused by two adjacent delimiter characters, 66can be detected by comparing the location referenced by the pointer returned 67in 68.Fa *stringp 69to 70.Ql \e0 . 71.Pp 72If 73.Fa *stringp 74is initially 75.Dv NULL , 76.Fn strsep 77returns 78.Dv NULL . 79.Sh EXAMPLES 80The following uses 81.Fn strsep 82to parse a string, containing tokens delimited by white space, into an 83argument vector: 84.Bd -literal -offset indent 85char **ap, *argv[10], *inputstring; 86 87for (ap = argv; (*ap = strsep(&inputstring, " \et")) != NULL;) 88 if (**ap != '\e0') 89 if (++ap >= &argv[10]) 90 break; 91.Ed 92.Sh HISTORY 93The 94.Fn strsep 95function 96is intended as a replacement for the 97.Fn strtok 98function. 99While the 100.Fn strtok 101function should be preferred for portability reasons (it conforms to 102.St -ansiC ) 103it is unable to handle empty fields, i.e. detect fields delimited by 104two adjacent delimiter characters, or to be used for more than a single 105string at a time. 106The 107.Fn strsep 108function first appeared in 109.Bx 4.4 . 110