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);
 
[Note] Note
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 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 lowercase, towlower() returns its lowercase equivalent; otherwise it returns wc.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
towlower() Thread safety MT-Safe locale
towlower_l() Thread safety MT-Safe

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 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 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/.


  Copyright (c) Bruno Haible <haibleclisp.cons.org>
and Copyright (C) 2014 Michael Kerrisk <mtk.manpagesgmail.com>

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References consulted:
  GNU glibc-2 source code and manual
  Dinkumware C library reference http://www.dinkumware.com/
  OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
  ISO/IEC 9899:1999