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1 | .\" Copyright (c) Bruno Haible <haible@clisp.cons.org> |
2 | .\" | |
89e3ffe9 | 3 | .\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA) |
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4 | .\" This is free documentation; you can redistribute it and/or |
5 | .\" modify it under the terms of the GNU General Public License as | |
6 | .\" published by the Free Software Foundation; either version 2 of | |
7 | .\" the License, or (at your option) any later version. | |
fe382ebf | 8 | .\" %%%LICENSE_END |
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9 | .\" |
10 | .\" References consulted: | |
11 | .\" GNU glibc-2 source code and manual | |
12 | .\" Dinkumware C library reference http://www.dinkumware.com/ | |
008f1ecc | 13 | .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html |
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14 | .\" ISO/IEC 9899:1999 |
15 | .\" | |
460495ca | 16 | .TH ISWUPPER 3 2015-08-08 "GNU" "Linux Programmer's Manual" |
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17 | .SH NAME |
18 | iswupper \- test for uppercase wide character | |
19 | .SH SYNOPSIS | |
20 | .nf | |
21 | .B #include <wctype.h> | |
68e4db0a | 22 | .PP |
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23 | .BI "int iswupper(wint_t " wc ); |
24 | .fi | |
25 | .SH DESCRIPTION | |
60a90ecd MK |
26 | The |
27 | .BR iswupper () | |
28 | function is the wide-character equivalent of the | |
29 | .BR isupper (3) | |
30 | function. | |
35cfd378 MK |
31 | It tests whether |
32 | .I wc | |
33 | is a wide character | |
d0f17b57 | 34 | belonging to the wide-character class "upper". |
fea681da | 35 | .PP |
d0f17b57 MK |
36 | The wide-character class "upper" is a subclass of the wide-character class |
37 | "alpha", and therefore also a subclass of the wide-character class "alnum", of | |
38 | the wide-character class "graph" and of the wide-character class "print". | |
fea681da | 39 | .PP |
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40 | Being a subclass of the wide-character class "print", the wide-character class |
41 | "upper" is disjoint from the wide-character class "cntrl". | |
fea681da | 42 | .PP |
d0f17b57 MK |
43 | Being a subclass of the wide-character class "graph", the wide-character class |
44 | "upper" is disjoint from the wide-character class "space" and its subclass | |
fea681da MK |
45 | "blank". |
46 | .PP | |
d0f17b57 MK |
47 | Being a subclass of the wide-character class "alnum", the wide-character class |
48 | "upper" is disjoint from the wide-character class "punct". | |
fea681da | 49 | .PP |
d0f17b57 MK |
50 | Being a subclass of the wide-character class "alpha", the wide-character class |
51 | "upper" is disjoint from the wide-character class "digit". | |
fea681da | 52 | .PP |
35cfd378 MK |
53 | The wide-character class "upper" contains at least those characters |
54 | .I wc | |
51700fd7 | 55 | which are equal to |
35cfd378 MK |
56 | .I towupper(wc) |
57 | and different from | |
58 | .IR towlower(wc) . | |
fea681da | 59 | .PP |
f81fb444 MK |
60 | The wide-character class "upper" always contains at least the |
61 | letters \(aqA\(aq to \(aqZ\(aq. | |
47297adb | 62 | .SH RETURN VALUE |
60a90ecd MK |
63 | The |
64 | .BR iswupper () | |
35cfd378 MK |
65 | function returns nonzero if |
66 | .I wc | |
67 | is a wide character | |
d0f17b57 | 68 | belonging to the wide-character class "upper". |
2b9b829d | 69 | Otherwise, it returns zero. |
69964c67 PH |
70 | .SH ATTRIBUTES |
71 | For an explanation of the terms used in this section, see | |
72 | .BR attributes (7). | |
73 | .TS | |
74 | allbox; | |
75 | lb lb lb | |
76 | l l l. | |
77 | Interface Attribute Value | |
78 | T{ | |
79 | .BR iswupper () | |
80 | T} Thread safety MT-Safe locale | |
81 | .TE | |
47297adb | 82 | .SH CONFORMING TO |
6a9eba52 | 83 | POSIX.1-2001, POSIX.1-2008, C99. |
fea681da | 84 | .SH NOTES |
d9bfdb9c | 85 | The behavior of |
60a90ecd | 86 | .BR iswupper () |
1274071a MK |
87 | depends on the |
88 | .B LC_CTYPE | |
89 | category of the | |
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90 | current locale. |
91 | .PP | |
92 | This function is not very appropriate for dealing with Unicode characters, | |
93 | because Unicode knows about three cases: upper, lower and title case. | |
47297adb | 94 | .SH SEE ALSO |
e37e3282 MK |
95 | .BR isupper (3), |
96 | .BR iswctype (3), | |
97 | .BR towupper (3) |