108 lines
3.4 KiB
Groff
108 lines
3.4 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" Chris Torek.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)strsep.3 8.1 (Berkeley) 6/9/93
|
|
.\"
|
|
.Dd June 9, 1993
|
|
.Dt STRSEP 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm strsep
|
|
.Nd separate strings
|
|
.Sh SYNOPSIS
|
|
.Fd #include <string.h>
|
|
.Ft char *
|
|
.Fn strsep "char **stringp" "char *delim"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn strsep
|
|
function locates, in the string referenced by
|
|
.Fa *stringp ,
|
|
the first occurrence of any character in the string
|
|
.Fa delim
|
|
(or the terminating
|
|
.Ql \e0
|
|
character) and replaces it with a
|
|
.Ql \e0 .
|
|
The location of the next character after the delimiter character
|
|
(or NULL, if the end of the string was reached) is stored in
|
|
.Fa *stringp .
|
|
The original value of
|
|
.Fa *stringp
|
|
is returned.
|
|
.Pp
|
|
An ``empty'' field, i.e. one caused by two adjacent delimiter characters,
|
|
can be detected by comparing the location referenced by the pointer returned
|
|
in
|
|
.Fa *stringp
|
|
to
|
|
.Ql \e0 .
|
|
.Pp
|
|
If
|
|
.Fa *stringp
|
|
is initially
|
|
.Dv NULL ,
|
|
.Fn strsep
|
|
returns
|
|
.Dv NULL .
|
|
.Sh EXAMPLES
|
|
The following uses
|
|
.Fn strsep
|
|
to parse a string, containing tokens delimited by white space, into an
|
|
argument vector:
|
|
.Bd -literal -offset indent
|
|
char **ap, *argv[10], *inputstring;
|
|
|
|
for (ap = argv; (*ap = strsep(&inputstring, " \et")) != NULL;)
|
|
if (**ap != '\e0')
|
|
++ap;
|
|
.Ed
|
|
.Sh HISTORY
|
|
The
|
|
.Fn strsep
|
|
function
|
|
is intended as a replacement for the
|
|
.Fn strtok
|
|
function.
|
|
While the
|
|
.Fn strtok
|
|
function should be preferred for portability reasons (it conforms to
|
|
.St -ansiC )
|
|
it is unable to handle empty fields, i.e. detect fields delimited by
|
|
two adjacent delimiter characters, or to be used for more than a single
|
|
string at a time.
|
|
The
|
|
.Fn strsep
|
|
function first appeared in 4.4BSD.
|