blob: 2bfe18dbfab7a14360714f3917725374d23c1dfe (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/*
FUNCTION
<<isxdigit>>, <<isxdigit_l>>---hexadecimal digit predicate
INDEX
isxdigit
INDEX
isxdigit_l
SYNOPSIS
#include <ctype.h>
int isxdigit(int <[c]>);
#include <ctype.h>
int isxdigit_l(int <[c]>, locale_t <[locale]>);
DESCRIPTION
<<isxdigit>> is a macro which classifies singlebyte charset values by table
lookup. It is a predicate returning non-zero for hexadecimal digits,
and <<0>> for other characters. It is defined only if <[c]> is
representable as an unsigned char or if <[c]> is EOF.
<<isxdigit_l>> is like <<isxdigit>> but performs the check based on the
locale specified by the locale object locale. If <[locale]> is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using `<<#undef isxdigit>>' or `<<#undef isxdigit_l>>'.
RETURNS
<<isxdigit>>, <<isxdigit_l>> return non-zero if <[c]> is a hexadecimal digit
(<<0>>--<<9>>, <<a>>--<<f>>, or <<A>>--<<F>>).
PORTABILITY
<<isxdigit>> is ANSI C.
<<isxdigit_l>> is POSIX-1.2008.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef isxdigit
int
isxdigit (int c)
{
return(__CTYPE_PTR[c+1] & ((_X)|(_N)));
}
|
