Section (3) iswlower
Name
iswlower — test for lowercase wide character
Synopsis
#include <wctype.h>
int
iswlower( |
wint_t wc) ; |
DESCRIPTION
The iswlower
() function is
the wide-character equivalent of the islower(3) function. It
tests whether wc
is a
wide character belonging to the wide-character class
lower.
The wide-character class lower is a subclass of the wide-character class alpha, and therefore also a subclass of the wide-character class alnum, of the wide-character class graph and of the wide-character class print.
Being a subclass of the wide-character class print, the wide-character class lower is disjoint from the wide-character class cntrl.
Being a subclass of the wide-character class graph, the wide-character class lower is disjoint from the wide-character class space and its subclass blank.
Being a subclass of the wide-character class alnum, the wide-character class lower is disjoint from the wide-character class punct.
Being a subclass of the wide-character class alpha, the wide-character class lower is disjoint from the wide-character class digit.
The wide-character class lower contains at least those
characters wc
which
are equal to towlower(wc)
and different
from towupper(wc)
.
The wide-character class lower always contains at least the letters _zsingle_quotesz_a_zsingle_quotesz_ to _zsingle_quotesz_z_zsingle_quotesz_.
RETURN VALUE
The iswlower
() function
returns nonzero if wc
is a wide character belonging to the wide-character class
lower. Otherwise, it returns zero.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
iswlower () |
Thread safety | MT-Safe locale |
NOTES
The behavior of iswlower
()
depends on the LC_CTYPE
category of the current locale.
This function is not very appropriate for dealing with Unicode characters, because Unicode knows about three cases: upper, lower and title case.
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/.
Copyright (c) Bruno Haible <haibleclisp.cons.org> %%%LICENSE_START(GPLv2+_DOC_ONEPARA) This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. %%%LICENSE_END References consulted: GNU glibc-2 source code and manual Dinkumware C library reference http://www.dinkumware.com/ OpenGroup_zsingle_quotesz_s Single UNIX specification http://www.UNIX-systems.org/online.html ISO/IEC 9899:1999 |