wctrans - wide-character translation mapping
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
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of wctrans() depends on the LC_CTYPE category of the current locale.
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