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WCTRANS(3P)                POSIX Programmer's Manual               WCTRANS(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
       wctrans - define character mapping
SYNOPSIS
       #include <wctype.h>
       wctrans_t wctrans(const char *charclass);

DESCRIPTION
       The wctrans() function is 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.
       The function shall return a value of type wctrans_t, which can be  used
       as  the  second  argument  to  subsequent  calls  of  towctrans().  The
       wctrans() function shall determine values of wctrans_t according to the
       rules  of the coded character set defined by character mapping informa-
       tion in the program's locale (category LC_CTYPE ). The values  returned
       by  wctrans()  shall be valid until a call to setlocale() that modifies
       the category LC_CTYPE.
RETURN VALUE
       The wctrans() function shall return 0  and may set  errno  to  indicate
       the error if the given character mapping name is not valid for the cur-
       rent locale (category LC_CTYPE ); otherwise, it shall return a non-zero
       object of type wctrans_t that can be used in calls to towctrans().
ERRORS
       The wctrans() function 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  IEEE Std 1003.1-2001,
       <wctype.h>
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 .

IEEE/The Open Group                  2003                          WCTRANS(3P)