wctrans - wide-character translation mapping
wctrans_t wctrans(const char *name);
The wctrans_t type represents a mapping which can map a wide character to
another wide character. Its nature is implementation-dependent, but the
special value (wctrans_t) 0 denotes an invalid mapping. Nonzero
wctrans_t values can be passed to the towctrans(3) function to
actually perform the wide-character mapping.
The wctrans() function returns a mapping, given by its
name. The set of valid names depends on the LC_CTYPE category of the
current locale, but the following names are valid in all locales.
"tolower" - realizes the tolower(3) mapping
"toupper" - realizes the toupper(3) mapping
The wctrans() function returns a mapping descriptor if the name is
valid. Otherwise, it returns (wctrans_t) 0.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of wctrans() depends on the LC_CTYPE category of the
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