NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON


TOWUPPER(3)               Linux Programmer's Manual              TOWUPPER(3)

NAME         top

       towupper, towupper_l - convert a wide character to uppercase

SYNOPSIS         top

       #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         top

       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         top

       If wc was convertible to uppercase, towupper() returns its uppercase
       equivalent; otherwise it returns wc.

ATTRIBUTES         top

       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        │
       └─────────────┴───────────────┴────────────────┘

VERSIONS         top

       The towupper_l() function first appeared in glibc 2.3.

CONFORMING TO         top

       towupper(): C99, POSIX.1-2001 (XSI); present as an XSI extension in
       POSIX.1-2008, but marked obsolete.

       towupper_l(): POSIX.1-2008.

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 4.07 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                              2015-03-02                      TOWUPPER(3)