134 lines
4.3 KiB
Groff
134 lines
4.3 KiB
Groff
.\" Copyright (c) 1988, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" the American National Standards Committee X3, on Information
|
|
.\" Processing Systems.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" from: @(#)strtok.3 8.2 (Berkeley) 2/3/94
|
|
.\" $NetBSD: strtok.3,v 1.13 2001/03/22 07:37:04 kleink Exp $
|
|
.\"
|
|
.Dd February 3, 1994
|
|
.Dt STRTOK 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm strtok, strtok_r
|
|
.Nd string tokens
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.Fd #include <string.h>
|
|
.Ft char *
|
|
.Fn strtok "char * restrict str" "const char * restrict sep"
|
|
.Ft char *
|
|
.Fn strtok_r "char *str" "const char *sep" "char **lasts"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn strtok
|
|
function
|
|
is used to isolate sequential tokens in a null-terminated string,
|
|
.Fa str .
|
|
These tokens are separated in the string by at least one of the
|
|
characters in
|
|
.Fa sep .
|
|
The first time that
|
|
.Fn strtok
|
|
is called,
|
|
.Fa str
|
|
should be specified; subsequent calls, wishing to obtain further tokens
|
|
from the same string, should pass a null pointer instead.
|
|
The separator string,
|
|
.Fa sep ,
|
|
must be supplied each time, and may change between calls.
|
|
.Pp
|
|
The
|
|
.Fn strtok
|
|
function
|
|
returns a pointer to the beginning of each subsequent token in the string,
|
|
after replacing the separator character itself with a
|
|
.Dv NUL
|
|
character.
|
|
Separator characters at the beginning of the string or at the
|
|
continuation point are skipped so that zero length tokens
|
|
are not returned.
|
|
When no more tokens remain, a null pointer is returned.
|
|
.Pp
|
|
The
|
|
.Fn strtok_r
|
|
function implements the functionality of
|
|
.Fn strtok
|
|
but is passed an additional argument,
|
|
.Fa lasts ,
|
|
which points to a user-provided pointer which is used by
|
|
.Fn strtok_r
|
|
to store state which needs to be kept between calls to scan the same string;
|
|
unlike
|
|
.Fn strtok ,
|
|
it is not necessary to delineate tokenizing to a single string at a time
|
|
when using
|
|
.Fn strtok_r .
|
|
.Sh SEE ALSO
|
|
.Xr index 3 ,
|
|
.Xr memchr 3 ,
|
|
.Xr rindex 3 ,
|
|
.Xr strchr 3 ,
|
|
.Xr strcspn 3 ,
|
|
.Xr strpbrk 3 ,
|
|
.Xr strrchr 3 ,
|
|
.Xr strsep 3 ,
|
|
.Xr strspn 3 ,
|
|
.Xr strstr 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn strtok
|
|
function
|
|
conforms to
|
|
.St -ansiC .
|
|
The
|
|
.Fn strtok_r
|
|
function conforms to
|
|
.St -p1003.1c-95 .
|
|
.Sh BUGS
|
|
There is no way to get tokens from multiple strings simultaneously.
|
|
.Pp
|
|
The System V
|
|
.Fn strtok ,
|
|
if handed a string containing only delimiter characters,
|
|
will not alter the next starting point, so that a call to
|
|
.Fn strtok
|
|
with a different (or empty) delimiter string
|
|
may return a
|
|
.Pf non- Dv NULL
|
|
value.
|
|
Since this implementation always alters the next starting point,
|
|
such a sequence of calls would always return
|
|
.Dv NULL .
|