1ISWUPPER(3) Linux Programmer's Manual ISWUPPER(3)
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6 iswupper - test for uppercase wide character
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9 #include <wctype.h>
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11 int iswupper(wint_t wc);
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14 The iswupper() function is the wide-character equivalent of the isup‐
15 per(3) function. It tests whether wc is a wide character belonging to
16 the wide-character class "upper".
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18 The wide-character class "upper" 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 "upper" 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 "upper" 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 "upper" 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 "upper" is disjoint from the wide-character class "digit".
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36 The wide-character class "upper" contains at least those characters wc
37 which are equal to towupper(wc) and different from towlower(wc).
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39 The wide-character class "upper" always contains at least the letters
40 'A' to 'Z'.
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43 The iswupper() function returns non-zero if wc is a wide character
44 belonging to the wide-character class "upper". Otherwise it returns
45 zero.
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48 C99.
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51 The behavior of iswupper() depends on the LC_CTYPE category of the cur‐
52 rent locale.
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54 This function is not very appropriate for dealing with Unicode charac‐
55 ters, because Unicode knows about three cases: upper, lower and title
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59 isupper(3), iswctype(3), towupper(3)
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62 This page is part of release 3.22 of the Linux man-pages project. A
63 description of the project, and information about reporting bugs, can
64 be found at http://www.kernel.org/doc/man-pages/.
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68GNU 1999-07-25 ISWUPPER(3)