home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
PsL Monthly 1993 December
/
PSL Monthly Shareware CD-ROM (December 1993).iso
/
prgmming
/
dos
/
c
/
snippet.exe
/
ISSHIFT.C
< prev
next >
Wrap
Text File
|
1992-04-13
|
902b
|
25 lines
/*-------------------------[ IsShift ]--------------------------*/
/* Determine whether a shift key is depressed */
/* public domain snippet by Jeff Dunlop */
/*--------------------------------------------------------------*/
/* local: */
/* key_flags = pointer to bios shift key area */
/* return: */
/* 1 if either shift key is depressed */
/*--------------------------------------------------------------*/
#if !defined(MK_FP)
#define MK_FP(seg,off) ((void far *)(((long)(seg) << 16)|(unsigned)(off)))
#endif
int IsShift(void)
{
unsigned char far *keyflags = MK_FP(0x40, 0x17);
return (*keyflags & 0x03);
}
/* -or?- */
#define IsShift ((*MK_FP(0x40, 0x17)) & 0x03)