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WCTRANS(3)                              BSD Library Functions Manual                              WCTRANS(3)

NAME
     towctrans, towctrans_l, wctrans, wctrans_l -- wide character mapping functions

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <wctype.h>

     wint_t
     towctrans(wint_t wc, wctrans_t desc);

     wctrans_t
     wctrans(const char *charclass);

     #include <wctype.h>
     #include <xlocale.h>

     wint_t
     towctrans_l(wint_t wc, wctrans_t desc, locale_t loc);

     wctrans_t
     wctrans_l(const char *charclass, locale_t loc);

DESCRIPTION
     The wctrans() function returns a value of type wctrans_t, which represents the requested wide character
     mapping operation and may be used as the second argument for calls to towctrans().

     The following character mapping names are recognised:

           tolower    toupper

     The towctrans() function transliterates the wide character wc, according to the mapping described by
     desc.

     While the towctrans() and wctrans() functions use the current locale, the towctrans_l() and wctrans_l()
     functions may be passed locales directly. See xlocale(3) for more information.

RETURN VALUES
     The towctrans() function returns the transliterated character if successful, otherwise it returns the
     character unchanged and sets errno.

     The wctrans() function returns non-zero if successful, otherwise it returns zero and sets errno.

EXAMPLES
     Reimplement towupper() in terms of towctrans() and wctrans():

           wint_t
           mytowupper(wint_t wc)
           {
                   return (towctrans(wc, wctrans("toupper")));
           }

ERRORS
     The towctrans() function will fail if:

     [EINVAL]           The supplied desc argument is invalid.

     The wctrans() function will fail if:

     [EINVAL]           The requested mapping name is invalid.

SEE ALSO
     tolower(3), toupper(3), wctype(3), xlocale(3)

STANDARDS
     The towctrans() and wctrans() functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY
     The towctrans() and wctrans() functions first appeared in FreeBSD 5.0.

BSD                                            October 3, 2002                                           BSD