wctrans—get wide-character translation type #include <wctype.h>
wctrans_t wctrans(const char *c);
Description
wctrans is a function which takes a string c and gives back
the appropriate wctrans_t type value associated with the string,
if one exists. The following values are guaranteed to be recognized:
"tolower" and "toupper".
Returns
wctrans returns 0 and sets errno to EINVAL if the
given name is invalid. Otherwise, it returns a valid non-zero wctrans_t
value.
Portability
wctrans is C99.
No supporting OS subroutines are required.