FS_MDINF/IOF_MINF
This trap returns information about the medium.
| Call Parameters | Return Parameters | ||
|---|---|---|---|
| D0.B | $45 | D0.L | Error return. |
| D1.L | D1.L | Empty/Good sectors. | |
| D3.W | Timeout | D3.L | Preserved. |
| A0.L | Channel ID | A0.L | Preserved. |
| A1.L | Address of buffer | A1.L | End of medium name. |
Errors
| ERR_NC | Not complete. |
| ERR_NO | Channel not open. |
Notes
- All registers not shown above are not used on entry and are preserved on exit.
- The channel ID in A0 must belong either to a file on the medium or to its directory.
- The msw of D1 will contain the number of empty 512 byte sectors on the medium. The number in D1.W is the total number of sectors available.
- The buffer whose address is given in A1.L must be 10 bytes long. This will contain the medium name left justified and padded to the right with the space character ($20).
Example
The example below shows the use of this trap. It is assumed that A0 contains the ID either of a file on the medium or of its directory. Also it is assumed that buf(A6) is the address of a 10-byte buffer.
info moveq #fs_mdinf,d0 ; $45
moveq #-1,d3 ; Timeout
lea buf(a6),a1 ; A 10-byte buffer
trap #3 ; Get the information
tst.l d0 ; OK? . .
bne error ; . . no!
george.gwilt