NAME

       iswctype - test character for a specified class

SYNOPSIS

       #include <wctype.h>

       int iswctype(wint_t wc, wctype_t charclass);

DESCRIPTION

       The  iswctype()  function  shall  determine  whether  the  wide-character code wc has the character class
       charclass, returning true or false. The iswctype() function is defined on WEOF and  wide-character  codes
       corresponding  to  the  valid character encodings in the current locale. If the wc argument is not in the
       domain of the function, the result is undefined. If the value of  charclass  is  invalid  (that  is,  not
       obtained  by  a call to wctype() or charclass is invalidated by a subsequent call to setlocale() that has
       affected category LC_CTYPE ) the result is unspecified.

RETURN VALUE

       The iswctype() function shall return non-zero (true) if and only if wc  has  the  property  described  by
       charclass.    If charclass is 0, iswctype() shall return 0.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

   Testing for a Valid Character
              #include <wctype.h>
              ...
              int yes_or_no;
              wint_t wc;
              wctype_t valid_class;
              ...
              if ((valid_class=wctype("vowel")) == (wctype_t)0)
                  /* Invalid character class. */
              yes_or_no=iswctype(wc,valid_class);

APPLICATION USAGE

       The  twelve  strings  "alnum"  ,  "alpha"  ,  "blank" , "cntrl" , "digit" , "graph" , "lower" , "print" ,
       "punct" , "space" , "upper" , and "xdigit" are reserved for the standard character classes. In the  table
       below, the functions in the left column are equivalent to the functions in the right column.

              iswalnum(wc)    iswctype(wc, wctype("alnum"))
              iswalpha(wc)    iswctype(wc, wctype("alpha"))
              iswblank(wc)    iswctype(wc, wctype("blank"))
              iswcntrl(wc)    iswctype(wc, wctype("cntrl"))
              iswdigit(wc)    iswctype(wc, wctype("digit"))
              iswgraph(wc)    iswctype(wc, wctype("graph"))
              iswlower(wc)    iswctype(wc, wctype("lower"))
              iswprint(wc)    iswctype(wc, wctype("print"))
              iswpunct(wc)    iswctype(wc, wctype("punct"))
              iswspace(wc)    iswctype(wc, wctype("space"))
              iswupper(wc)    iswctype(wc, wctype("upper"))
              iswxdigit(wc)   iswctype(wc, wctype("xdigit"))

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       iswalnum()  ,  iswalpha() , iswcntrl() , iswdigit() , iswgraph() , iswlower() , iswprint() , iswpunct() ,
       iswspace() , iswupper() , iswxdigit()  ,  setlocale()  ,  wctype()  ,  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <wchar.h>, <wctype.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc and The Open Group. In the event of any discrepancy between this version and the  original  IEEE  and
       The  Open  Group  Standard,  the  original  IEEE and The Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                           ISWCTYPE(P)