wctype(3p) — Linux manual page

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

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(3p)

       The Base Definitions volume of POSIX.1‐2017, wctype.h(0p)

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(3P)

Pages that refer to this page: wchar.h(0p), wctype.h(0p), iswctype(3p)

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