wctype (3) Linux Manual Page

wctype – wide-character classification

Synopsis

#include <wctype.h>

wctype_t wctype(const char *name);

Description

The wctype_t type represents a property which a wide character may or may not have. In other words, it represents a class of wide characters. This type’s nature is implementation-dependent, but the special value (wctype_t) 0 denotes an invalid property. Nonzero wctype_t values can be passed to the iswctype(3) function to actually test whether a given wide character has the property.

The wctype() function returns a property, given by its name. The set of valid names depends on the LC_CTYPE category of the current locale, but the following names are valid in all locales.

 "alnum" - realizes the isalnum(3) classification function
 "alpha" - realizes the isalpha(3) classification function
 "blank" - realizes the isblank(3) classification function
 "cntrl" - realizes the iscntrl(3) classification function
 "digit" - realizes the isdigit(3) classification function
 "graph" - realizes the isgraph(3) classification function
 "lower" - realizes the islower(3) classification function
 "print" - realizes the isprint(3) classification function
 "punct" - realizes the ispunct(3) classification function
 "space" - realizes the isspace(3) classification function
 "upper" - realizes the isupper(3) classification function
 "xdigit" - realizes the isxdigit(3) classification function

Return Value

The wctype() function returns a property descriptor if the name is valid. Otherwise, it returns (wctype_t) 0.

Attributes

For an explanation of the terms used in this section, see attributes(7).

Conforming To

POSIX.1-2001, POSIX.1-2008, C99.

Notes

The behavior of wctype() depends on the LC_CTYPE category of the current locale.

See Also

iswctype(3)

Colophon

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