WCTYPE(3)                  POSIX Programmer's Manual                 WCTYPE(3)



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

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 .



IEEE/The Open Group                  2017                            WCTYPE(3)
