TOWCTRANS(3P)                                       POSIX Programmer's Manual                                      TOWCTRANS(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       towctrans - wide-character transliteration

SYNOPSIS
       #include <wctype.h>

       wint_t towctrans(wint_t wc, wctrans_t desc);


DESCRIPTION
       The  towctrans() function shall transliterate the wide-character code wc using the mapping described by desc. The current
       setting of the LC_CTYPE category should be the same as during the call to wctrans() that returned the value desc.  If the
       value  of  desc  is  invalid (that is, not obtained by a call to wctrans() or desc is invalidated by a subsequent call to
       setlocale() that has affected category LC_CTYPE ), the result is unspecified.

       An application wishing to check for error situations should set errno to 0 before calling towctrans(). If errno  is  non-
       zero on return, an error has occurred.

RETURN VALUE
       If  successful,  the towctrans() function shall return the mapped value of wc using the mapping described by desc. Other-
       wise, it shall return wc unchanged.

ERRORS
       The towctrans() function may fail if:

       EINVAL desc contains an invalid transliteration descriptor.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The strings "tolower" and "toupper" are reserved for the standard mapping names. In the table below, the functions in the
       left column are equivalent to the functions in the right column.


              towlower(wc)    towctrans(wc, wctrans("tolower"))
              towupper(wc)    towctrans(wc, wctrans("toupper"))

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       towlower(), towupper(), wctrans(), 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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                 TOWCTRANS(3P)