collapseos/apps/ed/io.asm

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2019-07-13 11:29:06 -04:00
; io - handle ed's I/O
; *** Consts ***
;
; Max length of a line
.equ IO_MAXLEN 0x7f
; *** Variables ***
; Handle of the target file
.equ IO_FILE_HDL IO_RAMSTART
; block device targeting IO_FILE_HDL
.equ IO_BLK IO_FILE_HDL+FS_HANDLE_SIZE
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; Buffer for lines read from I/O.
.equ IO_LINE IO_BLK+BLOCKDEV_SIZE
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.equ IO_RAMEND IO_LINE+IO_MAXLEN+1 ; +1 for null
; *** Code ***
; Given a file name in (HL), open that file in (IO_FILE_HDL) and open a blkdev
; on it at (IO_BLK).
ioInit:
call fsFindFN
ret nz
ld ix, IO_FILE_HDL
call fsOpen
ld de, IO_BLK
ld hl, .blkdev
jp blkSet
.fsGetC:
ld ix, IO_FILE_HDL
jp fsGetC
.fsPutC:
ld ix, IO_FILE_HDL
jp fsPutC
.blkdev:
.dw .fsGetC, unsetZ
ioGetC:
push ix
ld ix, IO_BLK
call _blkGetC
pop ix
ret
ioPutC:
push ix
ld ix, IO_BLK
call _blkPutC
pop ix
ret
ioSeek:
push ix
ld ix, IO_BLK
call _blkSeek
pop ix
ret
ioTell:
push ix
ld ix, IO_BLK
call _blkTell
pop ix
ret