wctype3

Usage

#include <wctype.h>

Library

Standard C library (libc, -lc)

Overview

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).

Notes

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