wctype - define character class


     #include <wchar.h>

     wctype_t wctype(const char *charclass);


     The wctype() function is defined for valid  character  class
     names  as  defined in the current locale. The charclass is a
     string identifying  a  generic  character  class  for  which
     codeset-specific type information is required. The following
     character class names are defined in all locales:

     alnum                alpha                 blank
     cntrl                digit                 graph
     lower                print                 punct
     space                upper                 xdigit

     Additional character  class  names  defined  in  the  locale
     definition file (category LC_CTYPE) can also be specified.

     The function returns a value of type wctype_t, which can  be
     used   as   the  second  argument  to  subsequent  calls  of
     iswctype(3C). wctype() determines values of wctype_t accord-
     ing to the rules of the coded character set defined by char-
     acter type information in  the  program's  locale  (category
     LC_CTYPE). The values returned by wctype() are valid until a
     call to setlocale(3C) that modifies the category LC_CTYPE.


     The wctype() function returns 0 if the given character class
     name   is   not  valid  for  the  current  locale  (category
     LC_CTYPE); otherwise it returns an object of  type  wctype_t
     that can be used in calls to iswctype().


     See attributes(5) for descriptions of the  following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | MT-Level                    | MT-Safe with exceptions     |
    | CSI                         | Enabled                     |


     iswctype(3C), setlocale(3C), attributes(5)

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