🚀 go-pugleaf

Regarding my earlier problems with int86x...h

The reason why I can't get it to work is because I have to use
another routine to read the disk info: int86().  This, along with
correcting the structure (instead of using a long int variable),
fixed the problem I was having.  I solved this about two hours
after I posted the earlier program.        ogi

If any of you need the same type of routine, here is my C version
(original came from PC Magazine, July 1992, pg 496 written in
Pascal)


#include <stdio.h>
#include <dos.h>
#include <signal.h>
#include <process.h>

void main( int argc, char *argv[] );

int get_disk_serial( unsigned char diskno,
      char          *ser  );

int get_byte_form( unsigned char diskno,
       long int      *i );

void main( int  argc,
     char *argv[] )
{
 char ser[10];           // disk serial number
 int res;                // result of function call

 res = get_disk_serial( (unsigned char) 3, ser );
 if ( res == 0 ) {
  printf( "The serial number of drive C: is: %s\n", ser );
 } else {
  printf( "Call barfed. Big Bad Ugly Error.\n" );
 }

 return;
}

struct infobuffer
{
 int      infolevel;         // should be zero
 long int serial;            // serial number in byte form
 char     vol_label[11];     // volume label
 char     file_sys[8];       // file system
};

//
// I grabbed quite a bit of this procedure from:
//          PC Magazine, July 1992, page 496
// Written: 92/09/04
//
int get_disk_serial( unsigned char  diskno,
      char           ser[] )
{
 char     *hexdigits = "0123456789ABCDEF";
 int      res;
 struct infobuffer x;             // where we are putting info

 union REGS   inregs, outregs;

 inregs.h.ah = 0x69;     // DOS fcn call 69h : serial number code
 inregs.h.al = 0x00;     // read from disk, don't write!
 inregs.h.bl = diskno;   // read from disk number in diskno
 inregs.x.dx = (unsigned int) &x;       // data pointer

 res = int86( 0x21, &inregs, &outregs );
 if ( outregs.x.cflag ) {
  printf( "Little Fluffy took a round, better take him to the vet.\n" );
  return( 15 );
 }

 //*- Now long int variable serial should have disk serial number

 ser[0] = hexdigits[  x.serial >> 28 ];
 ser[1] = hexdigits[ (x.serial >> 24) & 0xf ];
 ser[2] = hexdigits[ (x.serial >> 20) & 0xf ];
 ser[3] = hexdigits[ (x.serial >> 16) & 0xf ];
 ser[4] = '-';
 ser[5] = hexdigits[ (x.serial >> 12) & 0xf ];
 ser[6] = hexdigits[ (x.serial >>  8) & 0xf ];
 ser[7] = hexdigits[ (x.serial >>  4) & 0xf ];
 ser[8] = hexdigits[ x.serial & 0xf ];
 ser[9] = '\0';

 return( 0 );
}