.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" References consulted:
.\"   GNU glibc-2 source code and manual
.\"   Dinkumware C library reference http://www.dinkumware.com/
.\"   OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
.\"   ISO/IEC 9899:1999
.\"
.TH WCSTOK 3  1999-07-25 "GNU" "Linux Programmer's Manual"
.SH NAME
wcstok \- split wide-character string into tokens
.SH SYNOPSIS
.nf
.B #include <wchar.h>
.sp
.BI "wchar_t *wcstok(wchar_t *" wcs ", const wchar_t *" delim ", wchar_t **" ptr );
.fi
.SH DESCRIPTION
The \fBwcstok\fP() function is the wide-character equivalent of the 
\fBstrtok\fP() function, 
with an added argument to make it multithread-safe. 
It can be used
to split a wide-character string \fIwcs\fP into tokens, where a token is
defined as a substring not containing any wide-characters from \fIdelim\fP.
.PP
The search starts at \fIwcs\fP, if \fIwcs\fP is not NULL, or at \fI*ptr\fP, if
\fIwcs\fP is NULL. First, any delimiter wide-characters are skipped, i.e. the
pointer is advanced beyond any wide-characters which occur in \fIdelim\fP.
If the end of the wide-character string is now reached, \fBwcstok\fP() returns
NULL, to indicate that no tokens were found, and stores an appropriate value
in \fI*ptr\fP, 
so that subsequent calls to \fBwcstok\fP() will continue to return NULL. 
Otherwise, the \fBwcstok\fP() function recognizes the beginning of a token
and returns a pointer to it, but before doing that, it zero-terminates the
token by replacing the next wide-character which occurs in \fIdelim\fP with
a L'\\0' character, and it updates \fI*ptr\fP so that subsequent calls will
continue searching after the end of recognized token.
.SH "RETURN VALUE"
The \fBwcstok\fP() function returns a pointer to the next token, or NULL if no
further token was found.
.SH NOTES
The original \fIwcs\fP wide-character string is destructively modified during
the operation.
.SH EXAMPLE
The following code loops over the tokens contained in a wide-character string.
.sp
.nf
wchar_t *wcs = ...;
wchar_t *token;
wchar_t *state;
for (token = wcstok(wcs, " \\t\\n", &state);
     token != NULL;
     token = wcstok(NULL, " \\t\\n", &state)) {
  ...
}
.fi
.SH "CONFORMING TO"
C99.
.SH "SEE ALSO"
.BR strtok (3),
.BR wcschr (3)