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wctrans(3posix)


NAME

   wctrans, wctrans_l --- define character mapping

SYNOPSIS

   #include <wctype.h>

   wctrans_t wctrans(const char *charclass);
   wctrans_t wctrans_l(const char *charclass, locale_t locale);

DESCRIPTION

   For wctrans(): 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.12008 defers to the ISO C standard.

   The wctrans() and wctrans_l() functions are defined for valid character
   mapping names identified in the current  locale.  The  charclass  is  a
   string  identifying a generic character mapping name for which codeset-
   specific information is required. The following character mapping names
   are defined in all locales: tolower and toupper.

   These  functions  shall  return a value of type wctrans_t, which can be
   used as the second argument to  subsequent  calls  of  towctrans()  and
   towctrans_l().

   The  wctrans()  and  wctrans_l()  functions  shall  determine values of
   wctrans_t according to the rules of the coded character set defined  by
   character  mapping  information  in the current locale or in the locale
   represented by locale, respectively (category LC_CTYPE).

   The values returned by  wctrans()  shall  be  valid  until  a  call  to
   setlocale() that modifies the category LC_CTYPE.

   The  values  returned  by  wctrans_l()  shall be valid only in calls to
   towctrans_l() with  a  locale  represented  by  locale  with  the  same
   LC_CTYPE category value.

   The  behavior is undefined if the locale argument to wctrans_l() is the
   special locale object LC_GLOBAL_LOCALE or is not a valid locale  object
   handle.

RETURN VALUE

   The  wctrans()  and  wctrans_l()  functions  shall return 0 and may set
   errno to indicate the error if the given character mapping name is  not
   valid for the current locale (category LC_CTYPE); otherwise, they shall
   return a non-zero object of type wctrans_t that can be used in calls to
   towctrans() and towctrans_l().

ERRORS

   These functions may fail if:

   EINVAL The  character mapping name pointed to by charclass is not valid
          in the current locale.

   The following sections are informative.

EXAMPLES

   None.

APPLICATION USAGE

   None.

RATIONALE

   None.

FUTURE DIRECTIONS

   None.

SEE ALSO

   towctrans()

   The Base Definitions volume of POSIX.12008, <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
   Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .



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