1iswlower(3) Library Functions Manual iswlower(3)
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6 iswlower - test for lowercase wide character
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9 Standard C library (libc, -lc)
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12 #include <wctype.h>
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14 int iswlower(wint_t wc);
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17 The iswlower() function is the wide-character equivalent of the is‐
18 lower(3) function. It tests whether wc is a wide character belonging
19 to the wide-character class "lower".
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21 The wide-character class "lower" is a subclass of the wide-character
22 class "alpha", and therefore also a subclass of the wide-character
23 class "alnum", of the wide-character class "graph" and of the wide-
24 character class "print".
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26 Being a subclass of the wide-character class "print", the wide-charac‐
27 ter class "lower" is disjoint from the wide-character class "cntrl".
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29 Being a subclass of the wide-character class "graph", the wide-charac‐
30 ter class "lower" is disjoint from the wide-character class "space" and
31 its subclass "blank".
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33 Being a subclass of the wide-character class "alnum", the wide-charac‐
34 ter class "lower" is disjoint from the wide-character class "punct".
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36 Being a subclass of the wide-character class "alpha", the wide-charac‐
37 ter class "lower" is disjoint from the wide-character class "digit".
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39 The wide-character class "lower" contains at least those characters wc
40 which are equal to towlower(wc) and different from towupper(wc).
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42 The wide-character class "lower" always contains at least the letters
43 'a' to 'z'.
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46 The iswlower() function returns nonzero if wc is a wide character be‐
47 longing to the wide-character class "lower". Otherwise, it returns
48 zero.
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51 For an explanation of the terms used in this section, see at‐
52 tributes(7).
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54 ┌─────────────────────────────────────┬───────────────┬────────────────┐
55 │Interface │ Attribute │ Value │
56 ├─────────────────────────────────────┼───────────────┼────────────────┤
57 │iswlower() │ Thread safety │ MT-Safe locale │
58 └─────────────────────────────────────┴───────────────┴────────────────┘
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61 C11, POSIX.1-2008.
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64 POSIX.1-2001, C99.
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67 The behavior of iswlower() depends on the LC_CTYPE category of the cur‐
68 rent locale.
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70 This function is not very appropriate for dealing with Unicode charac‐
71 ters, because Unicode knows about three cases: upper, lower, and title
72 case.
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75 islower(3), iswctype(3), towlower(3)
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79Linux man-pages 6.04 2023-03-30 iswlower(3)