iswctype(3p) - phpMan

ISWCTYPE(P)                                                        ISWCTYPE(P)



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() , isw-
       print() , 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 .



POSIX                                2003                          ISWCTYPE(P)

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