huschi.net

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, iswctype_l -- test character for a specified class
SYNOPSIS
       #include <wctype.h>
       int iswctype(wint_t wc, wctype_t charclass);
       int iswctype_l(wint_t wc, wctype_t charclass,
           locale_t locale);
DESCRIPTION
       For iswctype(): The functionality described on this reference  page  is
       aligned  with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This volume  of
       POSIX.1-2008 defers to the ISO C standard.
       The  iswctype()  and iswctype_l() functions shall determine whether the
       wide-character code wc has the  character  class  charclass,  returning
       true or false. The iswctype() and iswctype_l() functions are defined on
       WEOF and wide-character codes  corresponding  to  the  valid  character
       encodings  in  the  current  locale,  or  in  the locale represented by
       locale, respectively. 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 cate-
       gory LC_CTYPE) the result is unspecified.
       The behavior is undefined if the locale argument to iswctype_l() is the
       special  locale object LC_GLOBAL_LOCALE or is not a valid locale object
       handle.
RETURN VALUE
       The iswctype() and iswctype_l() functions shall return non-zero  (true)
       if  and  only  if wc has the property described by charclass.  If char-
       class is 0, these functions 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"))
           iswalnum_l(wc, locale)  iswctype_l(wc, wctype("alnum"), locale)
           iswalpha(wc)            iswctype(wc, wctype("alpha"))
           iswalpha_l(wc, locale)  iswctype_l(wc, wctype("alpha"), locale)
           iswblank(wc)            iswctype(wc, wctype("blank"))
           iswblank_l(wc, locale)  iswctype_l(wc, wctype("blank"), locale)
           iswcntrl(wc)            iswctype(wc, wctype("cntrl"))
           iswcntrl_l(wc, locale)  iswctype_l(wc, wctype("cntrl"), locale)
           iswdigit(wc)            iswctype(wc, wctype("digit"))
           iswdigit_l(wc, locale)  iswctype_l(wc, wctype("digit"), locale)
           iswgraph(wc)            iswctype(wc, wctype("graph"))
           iswgraph_l(wc, locale)  iswctype_l(wc, wctype("graph"), locale)
           iswlower(wc)            iswctype(wc, wctype("lower"))
           iswlower_l(wc, locale)  iswctype_l(wc, wctype("lower"), locale)
           iswprint(wc)            iswctype(wc, wctype("print"))
           iswprint_l(wc, locale)  iswctype_l(wc, wctype("print"), locale)
           iswpunct(wc)            iswctype(wc, wctype("punct"))
           iswpunct_l(wc, locale)  iswctype_l(wc, wctype("punct"), locale)
           iswspace(wc)            iswctype(wc, wctype("space"))
           iswspace_l(wc, locale)  iswctype_l(wc, wctype("space"), locale)
           iswupper(wc)            iswctype(wc, wctype("upper"))
           iswupper_l(wc, locale)  iswctype_l(wc, wctype("upper"), locale)
           iswxdigit(wc)           iswctype(wc, wctype("xdigit"))
           iswxdigit_l(wc, locale) iswctype_l(wc, wctype("xdigit"), locale)
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       iswalnum(), iswalpha(), iswcntrl(), iswdigit(), iswgraph(), iswlower(),
       iswprint(),  iswpunct(),  iswspace(),  iswupper(),  iswxdigit(), setlo-
       cale(), uselocale(), wctype()
       The Base Definitions volume of POSIX.1-2008, <locale.h>, <wctype.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         ISWCTYPE(3P)