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 <wctype.h> 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 toup- per(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 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. RETURN VALUE If wc was convertible to uppercase, towupper() returns its uppercase equivalent; otherwise it returns wc. VERSIONS The towupper_l() function first appeared in glibc 2.3. ATTRIBUTES For an explanation of the terms used in this section, see at- tributes(7). ┌─────────────────────────────────────┬───────────────┬────────────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────────────────┼───────────────┼────────────────┤ │towupper() │ Thread safety │ MT-Safe locale │ ├─────────────────────────────────────┼───────────────┼────────────────┤ │towupper_l() │ Thread safety │ MT-Safe │ └─────────────────────────────────────┴───────────────┴────────────────┘ STANDARDS towupper(): C99, POSIX.1-2001 (XSI); present as an XSI extension in POSIX.1-2008, but marked obsolete. towupper_l(): POSIX.1-2008. 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 char- acters, because Unicode knows about three cases: upper, lower, and ti- tle case. SEE ALSO iswupper(3), towctrans(3), towlower(3), locale(7) Linux man-pages 6.03 2022-12-15 towupper(3)
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