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1 | .\" Copyright (c) Bruno Haible <haible@clisp.cons.org> |
2 | .\" | |
fe382ebf | 3 | .\" %%%LICENSE_START(GPLv2+_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 | .\" | |
16 | .TH ISWDIGIT 3 1999-07-25 "GNU" "Linux Programmer's Manual" | |
17 | .SH NAME | |
18 | iswdigit \- test for decimal digit wide character | |
19 | .SH SYNOPSIS | |
20 | .nf | |
21 | .B #include <wctype.h> | |
22 | .sp | |
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. | |
c13182ef | 31 | It tests whether \fIwc\fP is a wide character |
d0f17b57 | 32 | belonging to the wide-character class "digit". |
fea681da | 33 | .PP |
d0f17b57 | 34 | The wide-character class "digit" is a subclass of the wide-character class |
988db661 | 35 | "xdigit", and therefore also a subclass |
d0f17b57 MK |
36 | of the wide-character class "alnum", of |
37 | the wide-character class "graph" and of the wide-character class "print". | |
fea681da | 38 | .PP |
988db661 | 39 | Being a subclass of the wide character |
d0f17b57 MK |
40 | class "print", the wide-character class |
41 | "digit" is disjoint from the wide-character class "cntrl". | |
fea681da | 42 | .PP |
988db661 | 43 | Being a subclass of the wide-character class "graph", |
d0f17b57 MK |
44 | the wide-character class |
45 | "digit" is disjoint from the wide-character class "space" and its subclass | |
fea681da MK |
46 | "blank". |
47 | .PP | |
988db661 | 48 | Being a subclass of the wide-character |
d0f17b57 MK |
49 | class "alnum", the wide-character class |
50 | "digit" is disjoint from the wide-character class "punct". | |
fea681da | 51 | .PP |
988db661 | 52 | The wide-character class "digit" is |
d0f17b57 | 53 | disjoint from the wide-character class |
fea681da MK |
54 | "alpha" and therefore also disjoint from its subclasses "lower", "upper". |
55 | .PP | |
988db661 | 56 | The wide-character class "digit" always |
f81fb444 | 57 | contains exactly the digits \(aq0\(aq to \(aq9\(aq. |
47297adb | 58 | .SH RETURN VALUE |
60a90ecd MK |
59 | The |
60 | .BR iswdigit () | |
c7094399 | 61 | function returns nonzero |
aecf31c0 | 62 | if \fIwc\fP is a wide character |
d0f17b57 | 63 | belonging to the wide-character class "digit". |
c13182ef | 64 | Otherwise it returns zero. |
47297adb | 65 | .SH CONFORMING TO |
68e1685c | 66 | C99. |
fea681da | 67 | .SH NOTES |
d9bfdb9c | 68 | The behavior of |
60a90ecd | 69 | .BR iswdigit () |
1274071a MK |
70 | depends on the |
71 | .B LC_CTYPE | |
72 | category of the | |
fea681da | 73 | current locale. |
47297adb | 74 | .SH SEE ALSO |
e37e3282 MK |
75 | .BR isdigit (3), |
76 | .BR iswctype (3) |