towupper(3) Library Functions Manual towupper(3)
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 wide-character equivalent of the toup-
per(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 con-
version 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 char-
acter 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.
VERSIONS
The towupper_l() function first appeared in glibc 2.3.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
┌─────────────────────────────────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼────────────────┤
│towupper() │ Thread safety │ MT-Safe locale │
├─────────────────────────────────────┼───────────────┼────────────────┤
│towupper_l() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴────────────────┘
STANDARDS
towupper(): C99, POSIX.1-2001 (XSI); present as an XSI extension in
POSIX.1-2008, but marked obsolete.
towupper_l(): POSIX.1-2008.
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 char-
acters, because Unicode knows about three cases: upper, lower, and ti-
tle case.
SEE ALSO
iswupper(3), towctrans(3), towlower(3), locale(7)
Linux man-pages 6.03 2022-12-15 towupper(3)
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