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
51
52
53
54
55
56
|
/*
** ext_getch()
**
** A getch() work-alike for use with extended keyboards.
**
** Parameters: none
**
** Returns: Extended key code as follows:
** 0->255 Normal key
** 256->511 Numeric pad key or Function key
** 512->767 Cursor pad key or Numeric pad
** "duplicate" key (Enter, /, *, -, +)
**
** Original Copyright 1992 by Bob Stout as part of
** the MicroFirm Function Library (MFL)
**
** This subset version is hereby donated to the public domain.
*/
#include <dos.h>
#include <ctype.h>
#define LoByte(x) ((unsigned char)((x) & 0xff))
#define HiByte(x) ((unsigned char)((unsigned short)(x) >> 8))
int ext_getch(void)
{
int key;
union REGS regs;
regs.h.ah = 0x10;
int86(0x16, ®s, ®s);
key = regs.x.ax;
switch (LoByte(key))
{
case 0:
key = HiByte(key) + 256;
break;
case 0xe0:
key = HiByte(key) + 512;
break;
default:
if (0xe0 == HiByte(key))
key = LoByte(key) + 512;
else
{
if (ispunct(LoByte(key)) && HiByte(key) > 0x36)
key = LoByte(key) + 512;
else key = LoByte(key);
}
}
return key;
}
|
