7.25.3.2.2 The wctrans function
Synopsis
#include <wctype.h>
wctrans_t wctrans(const char *property);
Description
The wctrans function constructs a value with type wctrans_t that describes a mapping between wide characters identified by the string argument property.
The strings listed in the description of the towctrans function shall be valid in all locales as property arguments to the wctrans function.
Returns
If property identifies a valid mapping of wide characters according to the LC_CTYPE category of the current locale, the wctrans function returns a nonzero value that is valid as the second argument to the towctrans function; otherwise, it returns zero.