OS_Fwm, File write miscellaneous
Register parameters
RST 20H, DEFB $4B
IN: A = reason code FA_PTR ($01) sequential pointer FA_EXT ($02) extent (size) of file FA_EOF ($03) goto end of file FA_RWD ($04) rewind to beginning of file HL = pointer to a 4 byte (32bit) vector (only for FA_PTR and FA_EXT) (contains value to be written, low byte first) IX = file handle (previously obtained using GN_Opf) OUT, if call successful: Fc = 0 OUT, if call failed: Fc = 1 A = error code: RC_HAND ($08), bad handle RC_BAD ($04), bad reason code Registers changed after return: ..BCDEHL/IXIY same AF....../.... different
Notes
FA_EOF and FA_RWD apply to OZ5 and newer. They allow to set quickly file pointer to the top or bottom of the specified 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_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)