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

       wctype, wctype_l — define character class

SYNOPSIS

       #include <wctype.h>

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

DESCRIPTION

       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:

              alnum   digit   punct
              alpha   graph   space
              blank   lower   upper
              cntrl   print   xdigit

       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.

RETURN VALUE

       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().

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       iswctype()

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

COPYRIGHT

       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 .