wctype(3) Linux Man Page - System Grab Bag

Name

wctype - wide-character classification

Library

Standard C library ( libc ", " -lc )

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). allbox; lbx lb lb T{ wctype()

Interface	Attribute	Value
T}	Thread safety	MT-Safe locale

Standards

C11, POSIX.1-2008.

History

POSIX.1-2001, C99.

Notes

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