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wcstok(3posix)


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.12008
   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.12008, <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 .



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