1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
3 .\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
4 .\" This is free documentation; you can redistribute it and/or
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10 .\" References consulted:
11 .\" GNU glibc-2 source code and manual
12 .\" Dinkumware C library reference http://www.dinkumware.com/
13 .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
16 .TH ISWLOWER 3 2021-03-22 "GNU" "Linux Programmer's Manual"
18 iswlower \- test for lowercase wide character
21 .B #include <wctype.h>
23 .BI "int iswlower(wint_t " wc );
28 function is the wide-character equivalent of the
34 belonging to the wide-character class "lower".
36 The wide-character class "lower" is a subclass of the wide-character class
37 "alpha", and therefore also a subclass
38 of the wide-character class "alnum", of
39 the wide-character class "graph" and of the wide-character class "print".
41 Being a subclass of the wide-character class "print",
42 the wide-character class
43 "lower" is disjoint from the wide-character class "cntrl".
45 Being a subclass of the wide-character class "graph",
46 the wide-character class "lower" is disjoint from the
47 wide-character class "space" and its subclass "blank".
49 Being a subclass of the wide-character class "alnum",
50 the wide-character class
51 "lower" is disjoint from the wide-character class "punct".
53 Being a subclass of the wide-character class "alpha",
54 the wide-character class
55 "lower" is disjoint from the wide-character class "digit".
57 The wide-character class "lower" contains at least
65 The wide-character class "lower" always contains
66 at least the letters \(aqa\(aq to \(aqz\(aq.
70 function returns nonzero
74 belonging to the wide-character class "lower".
75 Otherwise, it returns zero.
77 For an explanation of the terms used in this section, see
85 Interface Attribute Value
88 T} Thread safety MT-Safe locale
94 POSIX.1-2001, POSIX.1-2008, C99.
103 This function is not very appropriate for dealing with Unicode characters,
104 because Unicode knows about three cases: upper, lower, and title case.