NAME

       towupper, towupper_l - convert a wide character to uppercase

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 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.

VERSIONS

       The towupper_l() function first appeared in glibc 2.3.

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        │
       └─────────────┴───────────────┴────────────────┘

CONFORMING TO

       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  characters,  because
       Unicode knows about three cases: upper, lower and title case.

SEE ALSO

       iswupper(3), towctrans(3), towlower(3), locale(7)

COLOPHON

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       found at https://www.kernel.org/doc/man-pages/.