This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  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.opengroup.org/unix/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 .

IEEE/The Open Group                                   2017                                        WCTYPE(3POSIX)

       For  wctype(): 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.1‐2017 defers to the ISO C standard.

       The  wctype()  and  wctype_l()  functions  are  defined for valid character class names as defined in the
       current locale or in the locale represented by locale, respectively.

       The property argument is a string identifying a generic character class for which  codeset-specific  type
       information is required. The following character class names shall be defined in all locales:

              alnumdigitpunctalphagraphspaceblankloweruppercntrlprintxdigit

       Additional  character  class  names defined in the locale definition file (category LC_CTYPE) can also be
       specified.

       These functions shall return a value of type wctype_t, which can  be  used  as  the  second  argument  to
       subsequent calls of iswctype() and iswctype_l().

       The  wctype()  and  wctype_l() functions shall determine values of wctype_t according to the rules of the
       coded character set defined by character type  information  in  the  current  locale  or  in  the  locale
       represented by locale, respectively (category LC_CTYPE).

       The  values  returned  by  wctype() shall be valid until a call to setlocale() that modifies the category
       LC_CTYPE.

       The values returned by wctype_l() shall be valid only in calls to iswctype_l() with a locale  represented
       by locale with the same LC_CTYPE category value.

       The  behavior  is  undefined  if  the  locale  argument  to  wctype_l()  is  the  special  locale  object
       LC_GLOBAL_LOCALE or is not a valid locale object handle.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

       wctype, wctype_l — define character class

       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.

       None.

       The wctype() and wctype_l() functions shall return 0 if the given character class name is not  valid  for
       the  current locale (category LC_CTYPE); otherwise, they shall return an object of type wctype_t that can
       be used in calls to iswctype() and iswctype_l().

iswctype()

       The Base Definitions volume of POSIX.1‐2017, <wctype.h>

       #include <wctype.h>

       wctype_t wctype(const char *property);
       wctype_t wctype_l(const char *property, locale_t locale);