towupper

(3)

convert a wide character to uppercase

Library functionsmanpages-dev 6.9.1-1also documents towupper_l

#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

LIBRARY

Standard C library (libc, -lc)

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

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

STANDARDS

towupper(): C11, POSIX.1-2008 (XSI).
towupper_l(): POSIX.1-2008.

HISTORY

towupper(): C99, POSIX.1-2001 (XSI). Obsolete in POSIX.1-2008 (XSI).
towupper_l(): POSIX.1-2008. glibc 2.3.

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.