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.

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>.