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Monster Media 1994 #1
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PROG_C
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EXT_KEYS.C
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C/C++ Source or Header
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1994-04-03
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1KB
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57 lines
/*
** 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;
}