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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 ISWDIGIT 3 2015-08-08 "GNU" "Linux Programmer's Manual" |
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17 | .SH NAME |
18 | iswdigit \- test for decimal digit wide character | |
19 | .SH SYNOPSIS | |
20 | .nf | |
21 | .B #include <wctype.h> | |
68e4db0a | 22 | .PP |
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23 | .BI "int iswdigit(wint_t " wc ); |
24 | .fi | |
25 | .SH DESCRIPTION | |
60a90ecd MK |
26 | The |
27 | .BR iswdigit () | |
28 | function is the wide-character equivalent of the | |
29 | .BR isdigit (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 "digit". |
fea681da | 35 | .PP |
d0f17b57 | 36 | The wide-character class "digit" is a subclass of the wide-character class |
988db661 | 37 | "xdigit", and therefore also a subclass |
d0f17b57 MK |
38 | of the wide-character class "alnum", of |
39 | the wide-character class "graph" and of the wide-character class "print". | |
fea681da | 40 | .PP |
988db661 | 41 | Being a subclass of the wide character |
d0f17b57 MK |
42 | class "print", the wide-character class |
43 | "digit" is disjoint from the wide-character class "cntrl". | |
fea681da | 44 | .PP |
988db661 | 45 | Being a subclass of the wide-character class "graph", |
d0f17b57 MK |
46 | the wide-character class |
47 | "digit" is disjoint from the wide-character class "space" and its subclass | |
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48 | "blank". |
49 | .PP | |
988db661 | 50 | Being a subclass of the wide-character |
d0f17b57 MK |
51 | class "alnum", the wide-character class |
52 | "digit" is disjoint from the wide-character class "punct". | |
fea681da | 53 | .PP |
988db661 | 54 | The wide-character class "digit" is |
d0f17b57 | 55 | disjoint from the wide-character class |
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56 | "alpha" and therefore also disjoint from its subclasses "lower", "upper". |
57 | .PP | |
988db661 | 58 | The wide-character class "digit" always |
f81fb444 | 59 | contains exactly the digits \(aq0\(aq to \(aq9\(aq. |
47297adb | 60 | .SH RETURN VALUE |
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61 | The |
62 | .BR iswdigit () | |
c7094399 | 63 | function returns nonzero |
35cfd378 MK |
64 | if |
65 | .I wc | |
66 | is a wide character | |
d0f17b57 | 67 | belonging to the wide-character class "digit". |
2b9b829d | 68 | Otherwise, it returns zero. |
2d1a90ae PH |
69 | .SH ATTRIBUTES |
70 | For an explanation of the terms used in this section, see | |
71 | .BR attributes (7). | |
72 | .TS | |
73 | allbox; | |
74 | lb lb lb | |
75 | l l l. | |
76 | Interface Attribute Value | |
77 | T{ | |
78 | .BR iswdigit () | |
79 | T} Thread safety MT-Safe locale | |
80 | .TE | |
47297adb | 81 | .SH CONFORMING TO |
ca6a023d | 82 | POSIX.1-2001, POSIX.1-2008, C99. |
fea681da | 83 | .SH NOTES |
d9bfdb9c | 84 | The behavior of |
60a90ecd | 85 | .BR iswdigit () |
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86 | depends on the |
87 | .B LC_CTYPE | |
88 | category of the | |
fea681da | 89 | current locale. |
47297adb | 90 | .SH SEE ALSO |
e37e3282 MK |
91 | .BR isdigit (3), |
92 | .BR iswctype (3) |