towlower

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  un-
       changed.

       The towlower_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 towlower_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 lowercase, towlower()  returns  its  lowercase
       equivalent; otherwise it returns wc.

VERSIONS
       The towlower_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          |
       +-------------+---------------+----------------+
       |towlower()   | Thread safety | MT-Safe locale |
       +-------------+---------------+----------------+
       |towlower_l() | Thread safety | MT-Safe        |
       +-------------+---------------+----------------+
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 char-
       acters, because Unicode 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 5.05 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                       TOWLOWER(3)