Z88 Developers' Notes | ||
---|---|---|
Contents | Contents of System Calls |
OS_Mv, move bytes between stream and memory
RST 20H, DEFB $45
IN:
BC = number of bytes to move (0 = indicates no data) IX = handle of file (or device) DE = 0, move data from memory, starting at (HL), to the file HL = 0, move data from the file to memory, starting at (DE)OUT, if call (perhaps partially) successful:
Fc = 0 BC = number of bytes not 'moved' DE(in) = 0, HL points to next byte to read HL(in) = 0, DE points to next byte to writeOUT, if call failed:
Fc = 1 A = error code: RC_EOF ($09), end of file reached at some stage RC_HAND ($08), bad handle supplied in IX RC_RP ($13), device is read-protected, eg. :OUT.0 RC_ESC ($01), escape, if device :COM.0, :PRT.0, or :INP.0 RC_SUSP ($69), suspension if device is :COM.0, :PRT.0 or :INP.0 RC_DRAW ($66), redraw screen, if device is :INP.0 RC_QUIT ($67), kill request, if device is :INP.0Registers changed after return:
......../IXIY same AFBCDEHL/.... differentNotes:
If both HL and DE are zero or they are both non-zero then the operation of this call is undefined.Bugs:
OS_Mv on files previously opened with GN_Opf, OP_UP that are less or equal to 63 bytes length: Issuing a GN_Cl (close file) just after a OS_Mv, the file contents will be truncated into rubbish from the current file pointer and onwards (to the end of the file).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_Frm, file read miscellaneous
OS_Fwm, file write miscellaneous
OS_Gb, get byte from file (or device)
OS_Gbt, get byte from file (or device) with timeout
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)