wctype(3)wctype(3)NAMEwctype - Get a handle to classify wide characters
SYNOPSIS
#include <wctype.h>
wctype_t wctype(
const char *property );
The following prototype for wctype() does not conform to current indus‐
try standards and is supported only for backward compatibility:
#include <wchar.h>
wctype_t wctype(
char *property );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
wctype(): XSH5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Points to a string that identifies a character class, or property.
DESCRIPTION
The wctype() function obtains a handle for valid property names for
wide characters, as defined in the current locale. The handle can then
be used as the wc_prop parameter in a subsequent call to the iswctype()
function to check whether a wide character has this property. (See the
iswctype(3) reference page.) Values returned by the wctype() function
are valid until the setlocale() function modifies the value of the
LC_CTYPE environment variable. The property parameter can have a value
equal to one of the basic character classes or to any other character
class that is defined for a locale. The characters included in each
class are specified in the locale definition file (see the localedef(1)
and locale(4) reference pages for more information). The basic charac‐
ter classes are as follows: A combination of the classes alpha and
digit. Alphabetic (letter) characters. This class automatically
includes characters in the upper and lower classes. Blank characters,
such as the space or tab character. Control characters. This class
does not include characters in the alpha or print class. Numeric digit
characters. This class includes the following characters:
0 1 2 3 4 5 6 7 8 9 Graphic characters for printing. This class
does not include characters in the space or cntrl class but
includes all characters in the alpha, digit, and punct classes.
Lowercase characters. This class does not include characters in
the cntrl, digit, punct, or space class. At a minimum, the
lower class includes the 26 lowercase US-ASCII characters. These
are:
a b c d e f g h i j k l m n o p q r s t u v w x y z Print char‐
acters. This class includes characters in the graph and space
classes but does not include characters in the cntrl class.
Punctuation characters. This class does not include characters
in the space, alpha, digit, or cntrl class. Space characters.
At a minimum, this class includes the space, form-feed, newline,
carriage-return, tab, and vertical-tab characters. Uppercase
characters. At a minimum, this class includes the 26 uppercase
US ASCII characters. These are:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Hexadecimal
characters. This class includes the following characters:
0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f
For the list of supplemental properties that can be defined in Unicode
locales, see the locale(4) reference page. On Tru64 UNIX systems, Uni‐
code character properties are defined only in locales whose names end
in
RETURN VALUES
On successful completion, the wctype() function returns a value of type
wctype_t, which is a handle for valid property names in the current
locale. If the property parameter specifies a character class that is
not valid for the current locale, the function returns the value 0 cast
to wctype_t.
SEE ALSO
Commands: localedef(1)
Files: locale(4)
Functions: ctype(3), iswctype(3), setlocale(3), towupper(3), wctrans(3)wctype(3)
