The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> wctype, wctype_l - define character class

#### SYNOPSIS

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

> ``[CX] wctype_t wctype_l(const char *`property`, locale_t` locale`);``
> `
> `

#### DESCRIPTION

> For wctype(): [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 POSIX.1-2008 defers to the ISO C standard.

> The wctype() [CX] and wctype_l() functions are defined for valid character class names as defined in the current locale [CX] 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 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.

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

> The wctype() [CX] 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 [CX] 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.

> [CX] 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() [CX] 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() [CX] 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

> XBD <wctype.h>

#### CHANGE HISTORY

> First released in Issue 4.

#### Issue 5

> The following change has been made in this version 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>.

#### Issue 7

> The wctype_l() function is added from The Open Group Technical Standard, 2006, Extended API Set Part 4.

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0736 [302], XSH/TC1-2008/0737 [283], and XSH/TC1-2008/0738 [283] are applied.

End of informative text.

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