Name
towupper, towupper_l - convert a wide character to uppercaseLibrary
Standard C library ( libc ", " -lc )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 ofwc
. 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 returnswc
. Attributes
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
T} | Thread safety | MT-Safe locale |
T} | 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.