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TOWLOWER(3) FreeBSD Library Functions Manual TOWLOWER(3) NAME towlower, towlower_l, towupper, towupper_l - wide-character case letter conversion utilities SYNOPSIS #include <wctype.h> wint_t towlower(wint_t wc); wint_t towlower_l(wint_t wc, locale_t locale); wint_t towupper(wint_t wc); wint_t towupper_l(wint_t wc, locale_t locale); DESCRIPTION The towlower() and towlower_l() functions convert an upper-case wide character to the corresponding lower-case letter. The towupper() and towupper_l() functions convert a lower-case wide character to the corresponding upper-case letter. The functions towlower_l() and towupper_l() use the specified locale, whereas towlower() and towupper() use the thread-specific locale set with uselocale(3), falling back to the global locale set with setlocale(3). RETURN VALUES These functions return the corresponding character, if any. Otherwise, wc is returned unchanged. SEE ALSO iswlower(3), tolower(3), toupper(3), towctrans(3) STANDARDS The functions towlower() and towupper() conform to ISO/IEC 9899/AMD1:1995 ("ISO C90, Amendment 1") and ISO/IEC 9899:1999 ("ISO C99"), and towlower_l() and towupper_l() to IEEE Std 1003.1-2008 ("POSIX.1"). HISTORY The functions towlower() and towupper() have been available since OpenBSD 3.8, and towlower_l() and towupper_l() since OpenBSD 6.2. FreeBSD 14.1-RELEASE-p8 September 5, 2017 FreeBSD 14.1-RELEASE-p8