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TOWUPPER(3)                Linux Programmer's Manual               TOWUPPER(3)
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 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
       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 char-
       acters, because Unicode knows about three cases: upper, lower and title
       case.
SEE ALSO
       iswupper(3), towctrans(3), towlower(3), locale(7)
COLOPHON
       This  page  is  part of release 4.15 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.
GNU                               2017-09-15                       TOWUPPER(3)