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wctype(3) Library Functions Manual wctype(3)
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 charac-
ters. This type's nature is implementation-dependent, but the special
value (wctype_t) 0 denotes an invalid property. Nonzero wctype_t val-
ues 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 at-
tributes(7).
+-------------------------------------+---------------+----------------+
|Interface | Attribute | Value |
+-------------------------------------+---------------+----------------+
|wctype() | 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 cur-
rent locale.
SEE ALSO
iswctype(3)
Linux man-pages 6.04 2023-03-30 wctype(3)
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