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/*-------------------------[ 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)
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