1.\" Copyright (c) 1988, 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.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" from: @(#)strtok.3 8.2 (Berkeley) 2/3/94 37.\" $NetBSD: strtok.3,v 1.7 1998/02/05 18:50:59 perry Exp $ 38.\" 39.Dd February 3, 1994 40.Dt STRTOK 3 41.Os BSD 3 42.Sh NAME 43.Nm strtok 44.Nd string tokens 45.Sh LIBRARY 46.Lb libc 47.Sh SYNOPSIS 48.Fd #include <string.h> 49.Ft char * 50.Fn strtok "char *str" "const char *sep" 51.Ft char * 52.Fn strtok_r "char *str" "const char *sep" "char **lasts" 53.Sh DESCRIPTION 54.Bf -symbolic 55This interface is obsoleted by strsep(3). 56.Ef 57.Pp 58The 59.Fn strtok 60function 61is used to isolate sequential tokens in a null-terminated string, 62.Fa str . 63These tokens are separated in the string by at least one of the 64characters in 65.Fa sep . 66The first time that 67.Fn strtok 68is called, 69.Fa str 70should be specified; subsequent calls, wishing to obtain further tokens 71from the same string, should pass a null pointer instead. 72The separator string, 73.Fa sep , 74must be supplied each time, and may change between calls. 75.Pp 76The 77.Fn strtok 78function 79returns a pointer to the beginning of each subsequent token in the string, 80after replacing the separator character itself with a 81.Dv NUL 82character. 83When no more tokens remain, a null pointer is returned. 84.Sh SEE ALSO 85.Xr index 3 , 86.Xr memchr 3 , 87.Xr rindex 3 , 88.Xr strchr 3 , 89.Xr strcspn 3 , 90.Xr strpbrk 3 , 91.Xr strrchr 3 , 92.Xr strsep 3 , 93.Xr strspn 3 , 94.Xr strstr 3 95.Sh STANDARDS 96The 97.Fn strtok 98function 99conforms to 100.St -ansiC . 101.Sh BUGS 102There is no way to get tokens from multiple strings simultaneously. 103.Pp 104The System V 105.Fn strtok , 106if handed a string containing only delimiter characters, 107will not alter the next starting point, so that a call to 108.Fn strtok 109with a different (or empty) delimiter string 110may return a 111.Pf non- Dv NULL 112value. 113Since this implementation always alters the next starting point, 114such a sequence of calls would always return 115.Dv NULL . 116