towlower(3) Library Functions Manual towlower(3) towlower, towlower_l - C (libc, -lc) #include wint_t towlower(wint_t wc); wint_t towlower_l(wint_t wc, locale_t locale); glibc (. feature_test_macros(7)): towlower_l(): glibc 2.10: _XOPEN_SOURCE >= 700 glibc 2.10: _GNU_SOURCE towlower() tolower(3). wc , wc . wc . towupper_l() , , locale. towupper_l() , locale LC_GLOBAL_LOCALE ( duplocale(3)) . wc wchar_t WEOF. wc , towlower() ; wc. attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |towlower() | | MT-Safe locale | +----------------------------+----------------------------------------------------------+--------------------------+ |towlower_l() | | MT-Safe | +----------------------------+----------------------------------------------------------+--------------------------+ towlower() C11, POSIX.1-2008 (XSI). towlower_l() POSIX.1-2008. towlower() C99, POSIX.1-2001 (XSI). POSIX.1-2008 (XSI). towlower_l() glibc 2.3. POSIX.1-2008. LC_CTYPE . , : , . iswlower(3), towctrans(3), towupper(3), locale(7) () Azamat Hackimov , Dmitry Bolkhovskikh , Yuri Kozlov ; GNU (GNU General Public License - GPL, 3 ) , - . - , , () () () . Linux man-pages 6.18 8 2026 . towlower(3)