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### 3.33 `wctrans`, `wctrans_l`—get wide-character translation type

Synopsis

    #include <wctype.h>
    wctrans_t wctrans(const char *c);

    #include <wctype.h>
    wctrans_t wctrans_l(const char *c, locale_t locale);

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".

`wctrans_l` is like `wctrans` but performs the function based on the locale specified by the locale object locale. If locale is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.

Returns
`wctrans`, `wctrans_l` return 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. `wctrans_l` is POSIX-1.2008.

No supporting OS subroutines are required.