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

       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 POSIX.1‐2017, 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 <wctype.h> header shall define the locale_t type as described in <locale.h>.

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

       WEOF        As described in <wchar.h>.

       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 shall be declared as functions and may also be defined as  macros.  Function
       prototypes shall be provided for use with ISO C standard compilers.

           int       iswalnum(wint_t);
           int       iswalnum_l(wint_t, locale_t);
           int       iswalpha(wint_t);
           int       iswalpha_l(wint_t, locale_t);
           int       iswblank(wint_t);
           int       iswblank_l(wint_t, locale_t);
           int       iswcntrl(wint_t);
           int       iswcntrl_l(wint_t, locale_t);
           int       iswctype(wint_t, wctype_t);
           int       iswctype_l(wint_t, wctype_t, locale_t);
           int       iswdigit(wint_t);
           int       iswdigit_l(wint_t, locale_t);
           int       iswgraph(wint_t);
           int       iswgraph_l(wint_t, locale_t);
           int       iswlower(wint_t);
           int       iswlower_l(wint_t, locale_t);
           int       iswprint(wint_t);
           int       iswprint_l(wint_t, locale_t);
           int       iswpunct(wint_t);
           int       iswpunct_l(wint_t, locale_t);
           int       iswspace(wint_t);
           int       iswspace_l(wint_t, locale_t);
           int       iswupper(wint_t);
           int       iswupper_l(wint_t, locale_t);
           int       iswxdigit(wint_t);
           int       iswxdigit_l(wint_t, locale_t);
           wint_t    towctrans(wint_t, wctrans_t);
           wint_t    towctrans_l(wint_t, wctrans_t, locale_t);
           wint_t    towlower(wint_t);
           wint_t    towlower_l(wint_t, locale_t);
           wint_t    towupper(wint_t);
           wint_t    towupper_l(wint_t, locale_t);
           wctrans_t wctrans(const char *);
           wctrans_t wctrans_l(const char *, locale_t);
           wctype_t  wctype(const char *);
           wctype_t  wctype_l(const char *, locale_t);

       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 POSIX.1‐2017, Section 2.2,  The  Compilation  Environment,
       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
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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.kernel.org/doc/man-pages/reporting_bugs.html .