The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> wctype - define character class

#### SYNOPSIS

> ``#include <wctype.h>
> wctype_t wctype(const char *`property`);
> ``

#### DESCRIPTION

> [CX] 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 IEEE Std 1003.1-2001 defers to the ISO C standard.

> The wctype() function is defined for valid character class names as defined in the current locale. 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 alpha blank cntrl | digit graph lower print | punct space upper xdigit

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

> The function shall return a value of type wctype_t, which can be used as the second argument to subsequent calls of iswctype(). The wctype() function shall determine values of wctype_t according to the rules of the coded character set defined by character type information in the program's locale (category LC_CTYPE ). The values returned by wctype() shall be valid until a call to setlocale() that modifies the category LC_CTYPE .

#### RETURN VALUE

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

#### 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 IEEE Std 1003.1-2001, <wctype.h>

#### CHANGE HISTORY

> First released in Issue 4.

#### Issue 5

> The following change has been made in this issue for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E):

> - The SYNOPSIS has been changed to indicate that this function and associated data types are now made visible by inclusion of the <wctype.h> header rather than <wchar.h>.

End of informative text.

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