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These functions operate upon wide characters of type wchar_t.  The functions
test wide characters in various ways and convert them between upper and
lowercase.  The following functions are defined:

iswalnum (see isalnum)
    test for letter or digit

iswalpha (see isalpha)
    test for letter

iswascii (see isascii)
    test for ASCII character

iswcntrl (see iscntrl)
    test for control character

iswdigit (see isdigit)
    test for digit

iswgraph (see isgraph)
    test for printable character, except space

iswlower (see islower)
    test for letter in lowercase

iswprint (see isprint)
    test for printable character, including space

iswpunct (see ispunct)
    test for punctuation characters

iswspace (see isspace)
    test for "white space" characters

iswupper (see isupper)
    test for letter in uppercase

iswxdigit (see isxdigit)
    test for hexadecimal digit

wctype
    construct a property value for a given "property"

iswctype
    test a character for a specific property

towlower (see tolower)
    convert character to lowercase

towupper (see toupper)
    convert character to uppercase