PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME

       wcstok — split a wide-character string into tokens

SYNOPSIS

       #include <wchar.h>

       wchar_t *wcstok(wchar_t *restrict ws1, const wchar_t *restrict ws2,
           wchar_t **restrict ptr);

DESCRIPTION

       The functionality described on this reference page is aligned with the ISO C standard. Any
       conflict between the requirements described here and the ISO C standard is  unintentional.
       This volume of POSIX.1‐2008 defers to the ISO C standard.

       A  sequence  of  calls to wcstok() shall break the wide-character string pointed to by ws1
       into a sequence of tokens, each of which shall be delimited by a wide-character code  from
       the wide-character string pointed to by ws2.  The ptr argument points to a caller-provided
       wchar_t pointer into which the wcstok() function shall store information necessary for  it
       to continue scanning the same wide-character string.

       The  first  call  in  the sequence has ws1 as its first argument, and is followed by calls
       with a null pointer as their first argument. The separator string pointed to by ws2 may be
       different from call to call.

       The  first  call  in the sequence shall search the wide-character string pointed to by ws1
       for the first wide-character code that is not contained in the  current  separator  string
       pointed  to  by ws2.  If no such wide-character code is found, then there are no tokens in
       the wide-character string pointed to by ws1 and wcstok() shall return a null  pointer.  If
       such a wide-character code is found, it shall be the start of the first token.

       The  wcstok()  function  shall  then  search  from there for a wide-character code that is
       contained in the current separator string. If no such wide-character code  is  found,  the
       current  token  extends  to  the  end  of the wide-character string pointed to by ws1, and
       subsequent searches for a token shall return a null pointer. If such a wide-character code
       is  found,  it shall be overwritten by a null wide character, which terminates the current
       token. The wcstok() function shall save a pointer to the  following  wide-character  code,
       from which the next search for a token shall start.

       Each  subsequent call, with a null pointer as the value of the first argument, shall start
       searching from the saved pointer and behave as described above.

       The implementation shall behave as if no function calls wcstok().

RETURN VALUE

       Upon successful completion, the wcstok() function shall return  a  pointer  to  the  first
       wide-character  code  of a token. Otherwise, if there is no token, wcstok() shall return a
       null pointer.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The Base Definitions volume of POSIX.1‐2008, <wchar.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2013  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013  by  the
       Institute  of  Electrical  and  Electronics  Engineers,  Inc and The Open Group.  (This is
       POSIX.1-2008 with the  2013  Technical  Corrigendum  1  applied.)  In  the  event  of  any
       discrepancy  between  this  version and the original IEEE and The Open Group Standard, the
       original IEEE and The Open Group Standard is the referee document. The  original  Standard
       can be obtained online at http://www.unix.org/online.html .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .