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>.