towupper

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

towupper, towupper_l - convert a wide character to uppercase  

LIBRARY

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 wid-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	M-Safe locale
towupper_l()	Thread safety	M-Safe

 

STANDARDS

towupper()

C11, POSIX.-2008 (XSI).

towupper_l()

POSIX.-2008.

 

HISTORY

towupper()

C99, POSIX.-2001 (XSI). Obsolete in POSIX.-2008 (XSI).

towupper_l()

POSIX.-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.  

SEE ALSO

iswupper(3), towctrans(3), towlower(3), locale(7)

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Index

NAME

LIBRARY

SYNOPSIS

DESCRIPTION

RETURN VALUE

ATTRIBUTES

STANDARDS

HISTORY

NOTES

SEE ALSO