1.\" Copyright (c) 1998 Softweyr LLC. All rights reserved. 2.\" 3.\" strtok_r, from Berkeley strtok 4.\" Oct 13, 1998 by Wes Peters <wes@softweyr.com> 5.\" 6.\" Copyright (c) 1988, 1991, 1993 7.\" The Regents of the University of California. All rights reserved. 8.\" 9.\" This code is derived from software contributed to Berkeley by 10.\" the American National Standards Committee X3, on Information 11.\" Processing Systems. 12.\" 13.\" Redistribution and use in source and binary forms, with or without 14.\" modification, are permitted provided that the following conditions 15.\" are met: 16.\" 17.\" 1. Redistributions of source code must retain the above copyright 18.\" notices, this list of conditions and the following disclaimer. 19.\" 20.\" 2. Redistributions in binary form must reproduce the above 21.\" copyright notices, this list of conditions and the following 22.\" disclaimer in the documentation and/or other materials provided 23.\" with the distribution. 24.\" 25.\" 3. All advertising materials mentioning features or use of this 26.\" software must display the following acknowledgement: 27.\" 28.\" This product includes software developed by Softweyr LLC, the 29.\" University of California, Berkeley, and its contributors. 30.\" 31.\" 4. Neither the name of Softweyr LLC, the University nor the names 32.\" of its contributors may be used to endorse or promote products 33.\" derived from this software without specific prior written 34.\" permission. 35.\" 36.\" THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND 37.\" CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 38.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 39.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40.\" DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE REGENTS, OR 41.\" CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48.\" SUCH DAMAGE. 49.\" 50.\" @(#)strtok.3 8.2 (Berkeley) 2/3/94 51.\" $FreeBSD$ 52.\" 53.Dd November 27, 1998 54.Dt STRTOK 3 55.Os 56.Sh NAME 57.Nm strtok , strtok_r 58.Nd string tokens 59.Sh LIBRARY 60.Lb libc 61.Sh SYNOPSIS 62.Fd #include <string.h> 63.Ft char * 64.Fn strtok "char *str" "const char *sep" 65.Ft char * 66.Fn strtok_r "char *str" "const char *sep" "char **last" 67.Sh DESCRIPTION 68.Bf -symbolic 69This interface is obsoleted by 70.Xr strsep 3 . 71.Ef 72.Pp 73The 74.Fn strtok 75function 76is used to isolate sequential tokens in a null-terminated string, 77.Fa str . 78These tokens are separated in the string by at least one of the 79characters in 80.Fa sep . 81The first time that 82.Fn strtok 83is called, 84.Fa str 85should be specified; subsequent calls, wishing to obtain further tokens 86from the same string, should pass a null pointer instead. 87The separator string, 88.Fa sep , 89must be supplied each time, and may change between calls. 90.Pp 91The implementation will behave as if no library function calls 92.Fn strtok . 93.Pp 94The 95.Fn strtok_r 96function is a reentrant version of 97.Fn strtok . 98The context pointer 99.Fa last 100must be provided on each call. 101.Fn strtok_r 102may also be used to nest two parsing loops within one another, as 103long as separate context pointers are used. 104.Pp 105The 106.Fn strtok 107and 108.Fn strtok_r 109functions 110return a pointer to the beginning of each subsequent token in the string, 111after replacing the token itself with a 112.Dv NUL 113character. 114When no more tokens remain, a null pointer is returned. 115.Sh EXAMPLES 116The following uses 117.Fn strtok_r 118to parse two strings using separate contexts: 119.Bd -literal 120char test[80], blah[80]; 121char *sep = "\e\e/:;=-"; 122char *word, *phrase, *brkt, *brkb; 123 124strcpy(test, "This;is.a:test:of=the/string\e\etokenizer-function."); 125 126for (word = strtok_r(test, sep, &brkt); 127 word; 128 word = strtok_r(NULL, sep, &brkt)) 129{ 130 strcpy(blah, "blah:blat:blab:blag"); 131 132 for (phrase = strtok_r(blah, sep, &brkb); 133 phrase; 134 phrase = strtok_r(NULL, sep, &brkb)) 135 { 136 printf("So far we're at %s:%s\en", word, phrase); 137 } 138} 139.Ed 140.Sh SEE ALSO 141.Xr memchr 3 , 142.Xr strchr 3 , 143.Xr strcspn 3 , 144.Xr strpbrk 3 , 145.Xr strrchr 3 , 146.Xr strsep 3 , 147.Xr strspn 3 , 148.Xr strstr 3 149.Sh STANDARDS 150The 151.Fn strtok 152function 153conforms to 154.St -isoC . 155.Sh BUGS 156The System V 157.Fn strtok , 158if handed a string containing only delimiter characters, 159will not alter the next starting point, so that a call to 160.Fn strtok 161with a different (or empty) delimiter string 162may return a 163.Pf non- Dv NULL 164value. 165Since this implementation always alters the next starting point, 166such a sequence of calls would always return 167.Dv NULL . 168.Sh AUTHORS 169.An Wes Peters , 170Softweyr LLC: 171.Aq wes@softweyr.com 172.Pp 173Based on the 174.Fx 3.0 175implementation. 176