towupper

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



NAME
       towupper, towupper_l - convert a wide character to uppercase

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 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.

VERSIONS
       The towupper_l() function first appeared in glibc 2.3.

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

CONFORMING TO
       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
       characters, because Unicode knows about three cases: upper, lower, and
       title case.

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

COLOPHON
       This page is part of release 5.13 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                                2021-03-22                        TOWUPPER(3)