Category : Printer Utilities
Archive   : XPRT.ZIP
Filename : PRT_PKG.C

/*$ilib rtutil */

/*======================================================================*\
|| PRINTER STATUS PACKAGE ||
|| initprt() => 1 = up and online ||
|| 0 = user wants to terminate ||
|| chkprt() => values defined below as determined from the results ||
|| chkprt() => values defined below as determined ||
|| prtstatus()=> status values directly from the INT 17 (2) ||
|| ||
|| ||
\*======================================================================*/
#include "dos.h"

#define USER_TERM 0
#define ON_LINE 1
#define OFF_LINE 2
#define POW_DN 3
#define POW_UP 4
#define NOT_CON 5

static union REGS in, out;

/*===========================================================================*\
|| INITPRT returns 1 = printer up and ready ||
|| 0 = user abort ||
\*===========================================================================*/
int
initprt()
{
int i;
/*-------------------------------------------------------------------*\
| Initialize the printer |
\*-------------------------------------------------------------------*/
retry:
switch (i = chkprt())
{
case ON_LINE: /* powered & online */
return (1);
case OFF_LINE: /* powered & offline */
puts("Please place the printer ON-LINE ");
puts(" or press ANY key to terminate this program");
return (prt_or_kbd()); /* loop */
break;
case POW_UP: /* during power up */
while (chkprt() == POW_UP);
goto retry;
case POW_DN: /* powered down */
puts("Please TURN ON the printer and place ON-LINE ");
puts(" or press ANY key to terminate this program");
return (prt_or_kbd()); /* loop */
break;
case NOT_CON: /* not connected */
puts ("You have no printer connected to the system ??");
return (0);
break;
default :
printf("The printer is in an UNDETERMINED state (%d)\n",i);
printf("please correct the situation, or\n");
printf(" press ANY key to terminate\n");
return (prt_or_kbd()); /* loop */
}
}

/*===========================================================================*\
|| CHKPRT ||
|| determine status and return evaluated code, or full status if none ||
|| of the codes apply. ||
\*===========================================================================*/
int
chkprt()
{
switch (prtstatus())
{
case 144 : return (ON_LINE);
case 8 : return (OFF_LINE); /* HPLJ */
case 24 : return (OFF_LINE); /* EPSON */
case 192 : return (POW_UP);
case 200 : return (POW_DN); /* HPLJ */
case 136 : return (POW_DN); /* EPSON */
default : return ((int) out.h.ah);
};
}


/*===========================================================================*\
|| PRTSTATUS ||
|| return = ||
|| power & online = 144 1001 0000 ||
|| power & offline = 8 0000 1000 ||
|| during power up = 192 1100 0000 ||
|| no power = 200 1100 1000 ||
|| no power = 136 1000 1000 ||
|| not connected = 24 0001 1000 ||
|| ^^^^ ^-- i/o error ||
|| |||+---- printer selected ||
|| ||+----- out of paper ||
|| |+------ ack from printer ||
|| +------- 1=busy 0= not busy ||
\*===========================================================================*/
prtstatus()
{

/*-------------------------------------------------------------------*\
| now try interupt 17 (2) for status of the printer |
\*-------------------------------------------------------------------*/
in.h.ah = 2; /* STATUS */
in.x.dx = 0; /* printer 0 */
int86 (0x17,&in,&out); /* of PRINTER */
return (out.h.ah);
}


/*===========================================================================*\
|| clear printer or keyboard ||
|| check for either the printer comming on line (chkprt=1) or the ||
|| operator pressing a key (kbhit()=1). If keyboard, exit process. ||
|| ||
\*===========================================================================*/
static
prt_or_kbd ()
{
while ( (kbhit() == 0) && /* no key pressed */
(chkprt() != ON_LINE) ); /* printer not ready */
if (chkprt() == ON_LINE) return (ON_LINE);
else return (USER_TERM);

}