2 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
4 .\" SPDX-License-Identifier: GPL-2.0-or-later
6 .\" References consulted:
7 .\" GNU glibc-2 source code and manual
8 .\" Dinkumware C library reference http://www.dinkumware.com/
9 .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
12 .TH iswlower 3 (date) "Linux man-pages (unreleased)"
14 iswlower \- test for lowercase wide character
17 .RI ( libc ", " \-lc )
20 .B #include <wctype.h>
22 .BI "int iswlower(wint_t " wc );
27 function is the wide-character equivalent of the
33 belonging to the wide-character class "lower".
35 The wide-character class "lower" is a subclass of the wide-character class
36 "alpha", and therefore also a subclass
37 of the wide-character class "alnum", of
38 the wide-character class "graph" and of the wide-character class "print".
40 Being a subclass of the wide-character class "print",
41 the wide-character class
42 "lower" is disjoint from the wide-character class "cntrl".
44 Being a subclass of the wide-character class "graph",
45 the wide-character class "lower" is disjoint from the
46 wide-character class "space" and its subclass "blank".
48 Being a subclass of the wide-character class "alnum",
49 the wide-character class
50 "lower" is disjoint from the wide-character class "punct".
52 Being a subclass of the wide-character class "alpha",
53 the wide-character class
54 "lower" is disjoint from the wide-character class "digit".
56 The wide-character class "lower" contains at least
64 The wide-character class "lower" always contains
65 at least the letters \[aq]a\[aq] to \[aq]z\[aq].
69 function returns nonzero
73 belonging to the wide-character class "lower".
74 Otherwise, it returns zero.
76 For an explanation of the terms used in this section, see
84 Interface Attribute Value
87 T} Thread safety MT-Safe locale
93 POSIX.1-2001, POSIX.1-2008, C99.
102 This function is not very appropriate for dealing with Unicode characters,
103 because Unicode knows about three cases: upper, lower, and title case.