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collapseos/apps/ed/io.asm
Virgil Dupras b745f49186 Rename blockdev's API routines to GetB/PutB
The goal is to avoid mixing those routines with "character devices"
(acia, vpd, kbd) which aren't block devices and have routines that
have different expectations.

This is a first step to fixing #64.
2019-10-30 16:59:35 -04:00

94 lines
1.3 KiB
NASM

; 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 @+FS_HANDLE_SIZE
; Buffer for lines read from I/O.
.equ IO_LINE @+BLOCKDEV_SIZE
.equ IO_RAMEND @+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
.fsGetB:
ld ix, IO_FILE_HDL
jp fsGetB
.fsPutB:
ld ix, IO_FILE_HDL
jp fsPutB
.blkdev:
.dw .fsGetB, .fsPutB
ioGetB:
push ix
ld ix, IO_BLK
call _blkGetB
pop ix
ret
ioPutB:
push ix
ld ix, IO_BLK
call _blkPutB
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
ioSetSize:
push ix
ld ix, IO_FILE_HDL
call fsSetSize
pop ix
ret
; Write string (HL) in current file. Ends line with LF.
ioPutLine:
push hl
.loop:
ld a, (hl)
or a
jr z, .loopend ; null, we're finished
call ioPutB
jr nz, .error
inc hl
jr .loop
.loopend:
; Wrote the whole line, write ending LF
ld a, 0x0a
call ioPutB
jr z, .end ; success
; continue to error
.error:
call unsetZ
.end:
pop hl
ret