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

wctrans_l constructs a value of type wctrans_t that describes a mapping between wide characters identified by the string argument property in locale loc.

If property identifies a valid mapping of wide characters in the locale loc, wctrans_l returns a nonzero value that is valid as the second argument to towctrans_l; otherwise, it returns zero.


The only mappings supported are "tolower" and "toupper".