FS_TRUNCATE/IOF_TRNC
This trap truncates a file to the current position.
| Call Parameters | Return Parameters | ||
|---|---|---|---|
| D0.B | $4B | D0.L | Error return. |
| D1.L | D1.L | Corrupted. | |
| D3.W | Timeout | D3.L | Preserved. |
| A0.L | Channel ID | A0.L | Preserved. |
| A1.L | A1.L | Corrupted. | |
Errors
Any sub system IO errors including
| ERR_NC | Not complete. |
Notes
- All registers not shown above are not used on entry and are preserved on exit.
Example
The example below shows the use of this trap call to truncate a file to the position set in D1.L. It is assumed that A0 contains the file's ID.
trnc moveq #fs_posab,d0 ; $42
moveq #-1,d3 ; Timeout
trap #3 ; Set the position
tst.l d0 ; OK? . .
bne error ; . . no!
moveq #fs_truncate,d0 ; $4B
trap #3 ; Truncate
tst.l d0 ; OK? . .
bne error ; . . no!
george.gwilt