#include <wctype.h>

       wint_t towlower(wint_t wc);

       wint_t towlower_l(wint_t wc, locale_t locale);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

           Since glibc 2.10:
                  _XOPEN_SOURCE >= 700
           Before glibc 2.10:

       The  towlower()  function  is  the  wide-character  equivalent  of  the
       tolower(3) function.  If wc is an uppercase wide character,  and  there
       exists  a  lowercase  equivalent  in the current locale, it returns the
       lowercase equivalent of  wc.   In  all  other  cases,  wc  is  returned

       The towupper_l() function performs the same task, but performs the con-
       version based on the character type information in the locale specified
       by  locale.  The behavior of towupper_l() is undefined if locale is the
       special locale object LC_GLOBAL_LOCALE (see duplocale(3)) or is  not  a
       valid locale object handle.

       The argument wc must be representable as a wchar_t and be a valid char-
       acter in the locale or be the value WEOF.

       If wc was convertible to lowercase, towlower()  returns  its  lowercase
       equivalent; otherwise it returns wc.

       For   an   explanation   of   the  terms  used  in  this  section,  see

       |Interface    | Attribute     | Value          |
       |towlower()   | Thread safety | MT-Safe locale |
       |towlower_l() | Thread safety | MT-Safe        |
       The towlower_l() function first appeared in glibc 2.3.

       towlower(): C99, POSIX.1-2001 (XSI); present as  an  XSI  extension  in
       POSIX.1-2008, but marked obsolete.

       towlower_l(): POSIX.1-2008.

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GNU                               2015-03-02                       TOWLOWER(3)
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