TOWLOWER(3) Library Functions Manual TOWLOWER(3) NAME towlower, towlower_l - upper case to lower case letter conversion (wide character version) LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include wint_t towlower(wint_t wc); #include #include wint_t towlower_l(wint_t wc, locale_t loc); DESCRIPTION The towlower() function converts an upper-case letter to the corresponding lower-case letter. Although the towlower() function uses the current locale, the towlower_l() function may be passed a locale directly. See xlocale(3) for more information. RETURN VALUES If the argument is an upper-case letter, the towlower() function returns the corresponding lower-case letter if there is one; otherwise, the argument is returned unchanged. SEE ALSO iswlower(3), tolower(3), towupper(3), wctrans(3), xlocale(3) STANDARDS The towlower() function conforms to ISO/IEC 9899:1999 ("ISO C99"). macOS 26.6 October 3, 2002 macOS 26.6