blob: aeed383ecdea82d0f2f9bf5da5bc28511141e176 (
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
|
/*
FUNCTION
<<isupper>>, <<isupper_l>>---uppercase character predicate
INDEX
isupper
INDEX
isupper_l
SYNOPSIS
#include <ctype.h>
int isupper(int <[c]>);
#include <ctype.h>
int isupper_l(int <[c]>, locale_t <[locale]>);
DESCRIPTION
<<isupper>> is a macro which classifies singlebyte charset values by table
lookup. It is a predicate returning non-zero for uppercase letters
(<<A>>--<<Z>>), and 0 for other characters.
<<isupper_l>> is like <<isupper>> 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 isupper>>' or `<<#undef isupper_l>>'.
RETURNS
<<isupper>>, <<isupper_l>> return non-zero if <[c]> is an uppercase letter.
PORTABILITY
<<isupper>> is ANSI C.
<<isupper_l>> is POSIX-1.2008.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef isupper
int
isupper (int c)
{
return ((__CTYPE_PTR[c+1] & (_U|_L)) == _U);
}
|