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man:towupper_l

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 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
     attributes(7).
     allbox;  lb  lb  lb  l  l  l.   Interface Attribute Value T{ towupper()
     T}   Thread   safety MT-Safe   locale   T{   towupper_l()   T}   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 char-
     acters, 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 4.16 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 2017-09-15 TOWUPPER(3)

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