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 .