177 lines
4.7 KiB
Groff
177 lines
4.7 KiB
Groff
.\" Copyright (c) 1998 Softweyr LLC. All rights reserved.
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.\"
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.\" strtok_r, from Berkeley strtok
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.\" Oct 13, 1998 by Wes Peters <wes@softweyr.com>
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.\"
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.\" Copyright (c) 1988, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notices, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above
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.\" copyright notices, this list of conditions and the following
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.\" disclaimer in the documentation and/or other materials provided
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.\" with the distribution.
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.\"
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.\" 3. Neither the name of Softweyr LLC, the University nor the names
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.\" of its contributors may be used to endorse or promote products
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.\" derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND
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.\" CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE REGENTS, OR
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.\" CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)strtok.3 8.2 (Berkeley) 2/3/94
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.\" $FreeBSD$
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.\"
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.Dd January 22, 2016
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.Dt STRTOK 3
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.Os
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.Sh NAME
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.Nm strtok , strtok_r
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.Nd string tokens
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In string.h
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.Ft char *
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.Fn strtok "char *str" "const char *sep"
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.Ft char *
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.Fn strtok_r "char *str" "const char *sep" "char **last"
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.Sh DESCRIPTION
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.Bf -symbolic
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This interface is obsoleted by
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.Xr strsep 3 .
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.Ef
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.Pp
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The
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.Fn strtok
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function
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is used to isolate sequential tokens in a null-terminated string,
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.Fa str .
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These tokens are separated in the string by at least one of the
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characters in
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.Fa sep .
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The first time that
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.Fn strtok
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is called,
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.Fa str
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should be specified; subsequent calls, wishing to obtain further tokens
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from the same string, should pass a null pointer instead.
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The separator string,
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.Fa sep ,
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must be supplied each time, and may change between calls.
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.Pp
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The implementation will behave as if no library function calls
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.Fn strtok .
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.Pp
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The
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.Fn strtok_r
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function is a reentrant version of
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.Fn strtok .
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The context pointer
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.Fa last
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must be provided on each call.
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The
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.Fn strtok_r
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function
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may also be used to nest two parsing loops within one another, as
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long as separate context pointers are used.
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.Pp
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The
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.Fn strtok
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and
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.Fn strtok_r
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functions
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return a pointer to the beginning of each subsequent token in the string,
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after replacing the token itself with a
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.Dv NUL
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character.
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When no more tokens remain, a null pointer is returned.
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.Sh EXAMPLES
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The following uses
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.Fn strtok_r
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to parse two strings using separate contexts:
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.Bd -literal
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char test[80], blah[80];
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char *sep = "\e\e/:;=-";
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char *word, *phrase, *brkt, *brkb;
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strcpy(test, "This;is.a:test:of=the/string\e\etokenizer-function.");
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for (word = strtok_r(test, sep, &brkt);
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word;
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word = strtok_r(NULL, sep, &brkt))
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{
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strcpy(blah, "blah:blat:blab:blag");
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for (phrase = strtok_r(blah, sep, &brkb);
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phrase;
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phrase = strtok_r(NULL, sep, &brkb))
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{
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printf("So far we're at %s:%s\en", word, phrase);
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}
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}
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.Ed
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.Sh SEE ALSO
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.Xr memchr 3 ,
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.Xr strchr 3 ,
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.Xr strcspn 3 ,
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.Xr strpbrk 3 ,
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.Xr strrchr 3 ,
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.Xr strsep 3 ,
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.Xr strspn 3 ,
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.Xr strstr 3 ,
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.Xr wcstok 3
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.Sh STANDARDS
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The
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.Fn strtok
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function
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conforms to
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.St -isoC .
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The
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.Fn strtok_r
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function
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conforms to
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.St -p1003.1-2001 .
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.Sh AUTHORS
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.An Wes Peters Aq Mt wes@softweyr.com ,
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Softweyr LLC
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.Pp
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Based on the
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.Fx 3.0
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implementation.
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.Sh BUGS
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The System V
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.Fn strtok ,
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if handed a string containing only delimiter characters,
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will not alter the next starting point, so that a call to
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.Fn strtok
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with a different (or empty) delimiter string
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may return a
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.Pf non- Dv NULL
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value.
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Since this implementation always alters the next starting point,
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such a sequence of calls would always return
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.Dv NULL .
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