/*  beep_vv.c

    ************* Copyright 1988 by Vermont Creative Software **************

beep_vv()
Generates a tone of the specified frequency for the specified duration

Call

#include <vv_sys.h>

void beep_vv(hsec, freq)
int hsec;               Length of tone in 1/100's of a second
int freq;               Frequency of tone in hertz

hsec:  Specify the number of hundredths of a second to sound the beep or
one of the following predefined values:

    BPSHORT         3, signifying .03 second 
    BPMEDIUM        10, signifying .10 second
    BPLONG          30, signifying .30 second
    BPBELL          Use the operating system bell

freq:  Specify the number of hertz to sound the beep at or one of the 
following predefined values:    
    
    BPLOW            100 Hz    
    BPMIDDLE         500 Hz    
    BPHIGH          1000 Hz    
    BPBELL          Use the operating system bell
    
Returns

None

Description

PCDOS and OS/2 Systems:

beep_vv() generates a tone using the speaker in the IBM PC/XT/AT or PS/2 of 
the specified frequency and duration.  If either the frequency or length of
the tone is specified as BPBELL, the standard bell is sounded.

UNIX and VMS Systems:

If either (1) the frequency or length of the tone is BPBELL or (2)
both the frequency and length are greater than zero, beep_vv() sends the
terminal command string to ring the bell.

Related Functions

bell()

Cautions

PCDOS Systems:

Any beep with the requested duration shorter than 0.05 sec will sound for
approximately 0.03 sec, depending on the speed of the machine.

*/

#include <vv_clib.h>
#include <vv_sys.h>

#if ISC_UNIX
/*----------------------------------------------------------------------------*/
/*  Undefine some VV symbols that conflict with symbols defined in at_ansi.h  */
/*  and kd.h.								      */
/*----------------------------------------------------------------------------*/
#undef REVERSE
#undef BLINK
#undef UNDERLINE
#undef UP
#undef DOWN
#undef bell
#include <sys/types.h>
#include <sys/at_ansi.h>
#include <sys/kd.h>
#endif

void FASTCALL beep_vv(hsec, freq)
int hsec;
int freq;
{
#ifndef NO_DEBUG_CODE
    UCHAR * fn = (UCHAR *) "beep_vv";
#endif

   INIT_MODULE(fn);

#if ISC_UNIX
    if (_wnmemmap)
    {
	if (hsec == BPBELL || freq == BPBELL)
	    ioctl(1, KDMKTONE, (300L << 16) | 1350L );
	else
	{
	    ULONG lfreq, lhsec;
	                                /* if either parameter is OFF, skip   */
            if (!(hsec == OFF || freq == OFF)) 
	    {
	        lhsec = (ULONG) hsec * 10L;
	        lfreq = (1190000L / (ULONG) freq) & 0x0000ffff;
	        ioctl(1, KDMKTONE, (lhsec << 16) | lfreq);
	    }
        }
    }
    else
    {
					/*do we really need to ring bell?     */
	if (hsec == BPBELL || freq == BPBELL || (hsec > 0 && freq > 0))
	{
	    if (_cur_att == BLK_GRAPH)	/*make sure bell char will not be     */
		_vsatt_set(NORMAL);	/*interpreted as character to display */
	    _puts_pad(_kbd_cmd[KBD_BELL], 1);
	    _vv_flush();		/*flush output			      */
	}
    }
#else
				    	/*do we really need to ring bell?     */
    if (hsec == BPBELL || freq == BPBELL || (hsec > 0 && freq > 0))
    {
	if (_cur_att == BLK_GRAPH)	/*make sure bell char will not be     */
	    _vsatt_set(NORMAL);		/*interpreted as character to display */
	_puts_pad(_kbd_cmd[KBD_BELL], 1);
	_vv_flush();			/*flush output			      */
    }
#endif

    EXIT_NOERRH(fn);
    return;
}