|towupper(3)||Library Functions Manual||towupper(3)|
towupper, towupper_l - convert a wide character to uppercase
Standard C library (libc, -lc)
wint_t towupper(wint_t wc); wint_t towupper_l(wint_t wc, locale_t locale);
Since glibc 2.10:
_XOPEN_SOURCE >= 700
Before glibc 2.10:
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.
If wc was convertible to uppercase, towupper() returns its uppercase equivalent; otherwise it returns wc.
For an explanation of the terms used in this section, see attributes(7).
|towupper ()||Thread safety||MT-Safe locale|
|towupper_l ()||Thread safety||MT-Safe|
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.
|2023-07-20||Linux man-pages 6.05.01|