towupper, towupper_l - convert a wide character to uppercase
The towupper() function is the wide-character
equivalent of the toupper(3) function. If
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
wc must be representable as a
and be a valid character in the locale or be the value
wc was convertible to uppercase,
towupper() returns its uppercase equivalent; otherwise
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.
This page is part of release 5.10 of the Linux
project. A description of the project, information about reporting bugs,
and the latest version of this page, can be found at