NAME

       wctype.h - wide-character classification and mapping utilities

SYNOPSIS

       #include <wctype.h>

DESCRIPTION

       Some  of  the  functionality  described on this reference page extends the ISO C standard.
       Applications shall define the appropriate feature test macro (see  the  System  Interfaces
       volume  of  IEEE Std 1003.1-2001,  Section 2.2, The Compilation Environment) to enable the
       visibility of these symbols in this header.

       The <wctype.h> header shall define the following types:

       wint_t As described in <wchar.h> .

       wctrans_t
              A scalar type that  can  hold  values  which  represent  locale-specific  character
              mappings.

       wctype_t
              As described in <wchar.h> .

       The  following  shall be declared as functions and may also be defined as macros. Function
       prototypes shall be provided.

              int       iswalnum(wint_t);
              int       iswalpha(wint_t);
              int       iswblank(wint_t);
              int       iswcntrl(wint_t);
              int       iswdigit(wint_t);
              int       iswgraph(wint_t);
              int       iswlower(wint_t);
              int       iswprint(wint_t);
              int       iswpunct(wint_t);
              int       iswspace(wint_t);
              int       iswupper(wint_t);
              int       iswxdigit(wint_t);
              int       iswctype(wint_t, wctype_t);
              wint_t    towctrans(wint_t, wctrans_t);
              wint_t    towlower(wint_t);
              wint_t    towupper(wint_t);
              wctrans_t wctrans(const char *);
              wctype_t  wctype(const char *);

       The <wctype.h> header shall define the following macro name:

       WEOF   Constant expression of type wint_t that is returned by  several  MSE  functions  to
              indicate end-of-file.

       For  all  functions  described  in this header that accept an argument of type wint_t, the
       value is representable as a wchar_t or equals the value of WEOF. If this argument has  any
       other value, the behavior is undefined.

       The  behavior of these functions shall be affected by the LC_CTYPE category of the current
       locale.

       Inclusion of the  <wctype.h>  header  may  make  visible  all  symbols  from  the  headers
       <ctype.h>,  <stdarg.h>,  <stddef.h>,  <stdio.h>,  <stdlib.h>,  <string.h>,  <time.h>,  and
       <wchar.h>.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <ctype.h> , <locale.h> , <stdarg.h> , <stddef.h> , <stdio.h> , <stdlib.h> ,  <string.h>  ,
       <time.h>  ,  <wchar.h> , the System Interfaces volume of IEEE Std 1003.1-2001, iswalnum(),
       iswalpha(),  iswblank(),  iswcntrl(),  iswctype(),  iswdigit(),  iswgraph(),   iswlower(),
       iswprint(),  iswpunct(),  iswspace(),  iswupper(),  iswxdigit(), setlocale(), towctrans(),
       towlower(), towupper(), wctrans(), wctype()

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 .