towupper3
Convert a wide character to uppercase
Usage
#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)
Overview
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 |
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.
Releases
14 releases since Debian 2.2 (Potato); the text changed 13 times.