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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 dif-
       fer (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  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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)