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wctype - Get a handle to classify wide characters
const char *property );
The following prototype for wctype() does not conform to current industry
standards and is supported only for backward compatibility:
char *property );
Standard C Library (libc)
Interfaces documented on this reference page conform to industry standards
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
Points to a string that identifies a character class, or property.
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 character 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
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 characters. 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, Unicode
character properties are defined only in locales whose names end in .UTF-8.
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.
Functions: ctype(3), iswctype(3), setlocale(3), towupper(3), wctrans(3)
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