...
| Code Block | ||
|---|---|---|
| ||
IN:
A = reason code
FA_PTR ($01) return sequential pointer (32bit integer)
FA_EXT ($02) return extent (size) of file (32bit integer)
FA_EOF ($03) end of file enquiry
FA_BST ($04) buffer status (internal OZ usage)
DE = 0, return result in DEBC registers (D = MSB, C = LSB)
DE < $8000, return result in (DE)
IX = file handle (previously obtained with GN_Opf)
IX = $FFFF then system values are returned
OUT, if call successful:
Fc = 0
Fz = 1, end of file (FA_EOF)
Fz = 0, not end of file (FA_EOF)
DEBC = 32bit result (returned by FA_PTR, FA_EXT, FA_BST)
(D = most significant byte, C = least significant byte)
OUT, if call failed:
Fc = 1
A = error code:
RC_HAND ($08), bad handle
Registers changed after return:
......HL/IXIY same
AFBCDE../.... different |
...
This information can also be obtained by OS_Si/SI_Enq.
Bugs
DE must be in segment 0 or 1, otherwise the call is unreliable. DE should have been interpreted as pointer to store file information but the bug was never fixed in V2.2 / 3.0.
Related calls
GN_Cl, close file
GN_Del, delete a file from memory
GN_Opf, open file/resource (wildcard search)
GN_Ren, rename file
OS_Cl, internal close (OZ usage)
OS_Del, file delete (internal OZ usage)
OS_Fwm, file write miscellaneous
OS_Gb, get byte from file (or device)
OS_Gbt, get byte from file (or device) with timeout
OS_Mv, move bytes between stream and memory
OS_Op, internal open (OZ usage)
OS_Pb, write byte to file, device
OS_Pbt, write byte to file, device with timeout
OS_Ren, file rename (internal OZ usage)