WCTYPE(3) Library Functions Manual WCTYPE(3)

wctype — define character class

#include <wctype.h>

wctype_t wctype(const char *property);

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 (“POSIX.1”) defers to the ISO C standard.

The wctype () function is defined for valid character class names as defined in the current locale. The 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(3). 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(3) that modifies the category LC_CTYPE .

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(3).

No errors are defined.

None.

None.

None.

None.

iswctype(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <wctype.h>

First released in Issue 4.

The following change has been made in this issue for alignment with ISO/IEC 9899/AMD1:1995 (“ISO C90, Amendment 1”) (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>.

footer end

January 1, 2004 posix.fail