1ISWLOWER(3) Linux Programmer's Manual ISWLOWER(3)
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6 iswlower - test for lowercase wide character
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9 #include <wctype.h>
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11 int iswlower(wint_t wc);
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14 The iswlower() function is the wide-character equivalent of the
15 islower(3) function. It tests whether wc is a wide character belonging
16 to the wide-character class "lower".
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18 The wide-character class "lower" is a subclass of the wide-character
19 class "alpha", and therefore also a subclass of the wide-character
20 class "alnum", of the wide-character class "graph" and of the wide-
21 character class "print".
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23 Being a subclass of the wide-character class "print", the wide-charac‐
24 ter class "lower" is disjoint from the wide-character class "cntrl".
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26 Being a subclass of the wide-character class "graph", the wide-charac‐
27 ter class "lower" is disjoint from the wide-character class "space" and
28 its subclass "blank".
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30 Being a subclass of the wide-character class "alnum", the wide-charac‐
31 ter class "lower" is disjoint from the wide-character class "punct".
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33 Being a subclass of the wide-character class "alpha", the wide-charac‐
34 ter class "lower" is disjoint from the wide-character class "digit".
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36 The wide-character class "lower" contains at least those characters wc
37 which are equal to towlower(wc) and different from towupper(wc).
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39 The wide-character class "lower" always contains at least the letters
40 'a' to 'z'.
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43 The iswlower() function returns nonzero if wc is a wide character
44 belonging to the wide-character class "lower". Otherwise, it returns
45 zero.
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48 For an explanation of the terms used in this section, see
49 attributes(7).
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51 ┌───────────┬───────────────┬────────────────┐
52 │Interface │ Attribute │ Value │
53 ├───────────┼───────────────┼────────────────┤
54 │iswlower() │ Thread safety │ MT-Safe locale │
55 └───────────┴───────────────┴────────────────┘
57 POSIX.1-2001, POSIX.1-2008, C99.
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60 The behavior of iswlower() depends on the LC_CTYPE category of the cur‐
61 rent locale.
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63 This function is not very appropriate for dealing with Unicode charac‐
64 ters, because Unicode knows about three cases: upper, lower and title
65 case.
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68 islower(3), iswctype(3), towlower(3)
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71 This page is part of release 5.04 of the Linux man-pages project. A
72 description of the project, information about reporting bugs, and the
73 latest version of this page, can be found at
74 https://www.kernel.org/doc/man-pages/.
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78GNU 2015-08-08 ISWLOWER(3)