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b745f49186
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.
94 lines
1.3 KiB
NASM
94 lines
1.3 KiB
NASM
; io - handle ed's I/O
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; *** Consts ***
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;
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; Max length of a line
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.equ IO_MAXLEN 0x7f
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; *** Variables ***
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; Handle of the target file
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.equ IO_FILE_HDL IO_RAMSTART
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; block device targeting IO_FILE_HDL
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.equ IO_BLK @+FS_HANDLE_SIZE
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; Buffer for lines read from I/O.
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.equ IO_LINE @+BLOCKDEV_SIZE
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.equ IO_RAMEND @+IO_MAXLEN+1 ; +1 for null
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; *** Code ***
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; Given a file name in (HL), open that file in (IO_FILE_HDL) and open a blkdev
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; on it at (IO_BLK).
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ioInit:
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call fsFindFN
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ret nz
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ld ix, IO_FILE_HDL
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call fsOpen
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ld de, IO_BLK
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ld hl, .blkdev
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jp blkSet
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.fsGetB:
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ld ix, IO_FILE_HDL
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jp fsGetB
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.fsPutB:
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ld ix, IO_FILE_HDL
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jp fsPutB
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.blkdev:
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.dw .fsGetB, .fsPutB
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ioGetB:
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push ix
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ld ix, IO_BLK
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call _blkGetB
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pop ix
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ret
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ioPutB:
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push ix
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ld ix, IO_BLK
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call _blkPutB
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pop ix
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ret
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ioSeek:
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push ix
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ld ix, IO_BLK
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call _blkSeek
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pop ix
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ret
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ioTell:
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push ix
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ld ix, IO_BLK
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call _blkTell
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pop ix
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ret
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ioSetSize:
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push ix
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ld ix, IO_FILE_HDL
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call fsSetSize
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pop ix
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ret
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; Write string (HL) in current file. Ends line with LF.
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ioPutLine:
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push hl
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.loop:
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ld a, (hl)
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or a
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jr z, .loopend ; null, we're finished
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call ioPutB
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jr nz, .error
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inc hl
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jr .loop
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.loopend:
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; Wrote the whole line, write ending LF
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ld a, 0x0a
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call ioPutB
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jr z, .end ; success
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; continue to error
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.error:
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call unsetZ
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.end:
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pop hl
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ret
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