towupper(3) Library Functions Manual towupper(3) NAME towupper, towupper_l - convert a wide character to uppercase LIBRARY Standard C library (libc, -lc) SYNOPSIS #include wint_t towupper(wint_t wc); wint_t towupper_l(wint_t wc, locale_t locale); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): towupper_l(): Since glibc 2.10: _XOPEN_SOURCE >= 700 Before glibc 2.10: _GNU_SOURCE DESCRIPTION The towupper() function is the wide-character equivalent of the toupper(3) function. If wc is a lowercase wide character, and there exists an uppercase equivalent in the current locale, it returns the uppercase equivalent of wc. In all other cases, wc is returned unchanged. The towupper_l() function performs the same task, but performs the conversion 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 character in the locale or be the value WEOF. RETURN VALUE If wc was convertible to uppercase, towupper() returns its uppercase equivalent; otherwise it returns wc. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). +-------------------------------------+---------------+----------------+ |Interface | Attribute | Value | +-------------------------------------+---------------+----------------+ |towupper () | Thread safety | MT-Safe locale | +-------------------------------------+---------------+----------------+ |towupper_l () | Thread safety | MT-Safe | +-------------------------------------+---------------+----------------+ STANDARDS towupper() C11, POSIX.1-2008 (XSI). towupper_l() POSIX.1-2008. HISTORY towupper() C99, POSIX.1-2001 (XSI). Obsolete in POSIX.1-2008 (XSI). towupper_l() POSIX.1-2008. glibc 2.3. NOTES The behavior of these functions depends on the LC_CTYPE category of the locale. These functions are not very appropriate for dealing with Unicode characters, because Unicode knows about three cases: upper, lower, and title case. SEE ALSO iswupper(3), towctrans(3), towlower(3), locale(7) Linux man-pages 6.9.1 2024-05-02 towupper(3)