wctype(3S)

NAME
     wctype: iswalpha, iswupper, iswlower, iswdigit, iswxdigit, iswalnum,
     iswspace, iswpunct, iswprint, iswgraph, iswcntrl, iswascii, isphonogram,
     isideogram, isenglish, isnumber, isspecial - classify ASCII and
     supplementary code set characters

SYNOPSIS
     #include <ctype.h>
     #include <widec.h>
     #include <wctype.h>
     int iswalpha(wchar_t c);
     ...

DESCRIPTION
     These functions classify character-coded wchar_t values by table lookup.
     Each is a predicate returning nonzero for true, zero for false.  The
     lookup table is generated by wchrtbl(1M).  Each of these functions
     operates on both ASCII and supplementary code sets unless otherwise
     indicated.

     iswalpha(c)       c is an English letter.

     iswupper(c)       c is an English uppercase letter.

     iswlower(c)       c is an English lowercase letter.

     iswdigit(c)       c is a digit [0-9].

     iswxdigit(c)      c is a hexadecimal digit [0-9], [A-F], or [a-f].

     iswalnum(c)       c is an alphanumeric (letter or digit).

     iswspace(c)       c is a space character or a tab, carriage return,
                       newline, vertical tab, or form-feed.

     iswpunct(c)       c is a punctuation character (neither control nor
                       alphanumeric).

     iswprint(c)       c is a printing character including space.

     iswgraph(c)       c is a printing character; like iswprint except false
                       for space.

     iswcntrl(c)       c is a delete character (0177), an ordinary control
                       character (less than 040), or other control character
                       of a supplementary code set.

     iswascii(c)       c is an ASCII character code less than 0200.
     isphonogram(c)    c is a phonogram in a supplementary code set.

     isideogram(c)     c is an ideogram in a supplementary code set.

     isenglish(c)      c is an English letters in a supplementary code set.

     isnumber(c)       c is a digit of a supplementary code set.

     isspecial(c)      c is a special character in a supplementary code set.

SEE ALSO
     wchrtbl(1M), ctype(3C), wconv(3S).