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 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

  Multithreading (see pthreads(7))
The towupper() function is thread-safe with exceptions. It can be safely used in multithreaded applications, as long as setlocale(3) is not called to change the locale during its execution.

VERSIONS
The towupper_l() function first appeared in glibc 2.3.

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 3.65 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.