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 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  speci-
       fied 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

       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)