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ISWCTYPE(3P)               POSIX Programmer's Manual              ISWCTYPE(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
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  corre-
       sponding to the valid character encodings in the current locale. If the
       wc argument is not in the domain of the function, the result  is  unde-
       fined. 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 unspec-
       ified.
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(), setlo-
       cale(), 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(3P)