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 FreeBSD 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 strsep(3). 70.Ef 71.Pp 72The 73.Fn strtok 74function 75is used to isolate sequential tokens in a null-terminated string, 76.Fa str . 77These tokens are separated in the string by at least one of the 78characters in 79.Fa sep . 80The first time that 81.Fn strtok 82is called, 83.Fa str 84should be specified; subsequent calls, wishing to obtain further tokens 85from the same string, should pass a null pointer instead. 86The separator string, 87.Fa sep , 88must be supplied each time, and may change between calls. 89.Pp 90The implementation will behave as if no library function calls 91.Fn strtok . 92.Pp 93The 94.Fn strtok_r 95function is a reentrant version of 96.Fn strtok . 97The context pointer 98.Fa last 99must be provided on each call. 100.Fn strtok_r 101may also be used to nest two parsing loops within one another, as 102long as separate context pointers are used. 103.Pp 104The 105.Fn strtok 106and 107.Fn strtok_r 108functions 109return a pointer to the beginning of each subsequent token in the string, 110after replacing the token itself with a 111.Dv NUL 112character. 113When no more tokens remain, a null pointer is returned. 114.Sh EXAMPLES 115The following uses 116.Fn strtok_r 117to parse two strings using separate contexts: 118.Bd -literal 119char test[80], blah[80]; 120char *sep = "\e\e/:;=-"; 121char *word, *phrase, *brkt, *brkb; 122 123strcpy(test, "This;is.a:test:of=the/string\e\etokenizer-function."); 124 125for (word = strtok_r(test, sep, &brkt); 126 word; 127 word = strtok_r(NULL, sep, &brkt)) 128{ 129 strcpy(blah, "blah:blat:blab:blag"); 130 131 for (phrase = strtok_r(blah, sep, &brkb); 132 phrase; 133 phrase = strtok_r(NULL, sep, &brkb)) 134 { 135 printf("So far we're at %s:%s\en", word, phrase); 136 } 137} 138.Ed 139.Sh SEE ALSO 140.Xr memchr 3 , 141.Xr strchr 3 , 142.Xr strcspn 3 , 143.Xr strpbrk 3 , 144.Xr strrchr 3 , 145.Xr strsep 3 , 146.Xr strspn 3 , 147.Xr strstr 3 148.Sh STANDARDS 149The 150.Fn strtok 151function 152conforms to 153.St -isoC . 154.Sh BUGS 155The System V 156.Fn strtok , 157if handed a string containing only delimiter characters, 158will not alter the next starting point, so that a call to 159.Fn strtok 160with a different (or empty) delimiter string 161may return a 162.Pf non- Dv NULL 163value. 164Since this implementation always alters the next starting point, 165such a sequence of calls would always return 166.Dv NULL . 167.Sh AUTHORS 168.An Wes Peters , 169Softweyr LLC: 170.Aq wes@softweyr.com 171.Pp 172Based on the 173.Fx 3.0 174implementation. 175