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



NAME
       towlower, towlower_l - convert a wide character to lowercase

SYNOPSIS
       #include <wctype.h>

       wint_t towlower(wint_t wc);

       wint_t towlower_l(wint_t wc, locale_t locale);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       towlower_l():
           Since glibc 2.10:
                  _XOPEN_SOURCE >= 700
           Before glibc 2.10:
                  _GNU_SOURCE

DESCRIPTION
       The  towlower()  function is the wide-character equivalent of the tolower(3) function.  If
       wc is an uppercase wide character, and there exists a lowercase equivalent in the  current
       locale,  it  returns  the  lowercase 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 towup‐
       per_l() is undefined if locale is the special locale object LC_GLOBAL_LOCALE  (see  duplo‐
       cale(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 lowercase, towlower() returns its lowercase equivalent; otherwise
       it returns wc.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The  towlower()  function is thread-safe with exceptions.  It can be safely used in multi‐
       threaded applications, as long as setlocale(3) is not called to change the  locale  during
       its execution.

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

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

       towlower_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 Uni‐
       code knows about three cases: upper, lower and title case.

SEE ALSO
       iswlower(3), towctrans(3), towupper(3), locale(7)

COLOPHON
       This  page  is  part of release 3.74 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 http://www.kernel.org/doc/man-pages/.



GNU                                         2014-03-18                                TOWLOWER(3)