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collapseos/apps/ed/io.asm

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apps/ed: start implementing I/O
2019-07-14 01:29:06 +10:00
; io - handle ed's I/O
; *** Consts ***
;
; Max length of a line
.equ IO_MAXLEN 0x7f
; *** Variables ***
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
; Handle of the target file
.equ IO_FILE_HDL IO_RAMSTART
; block device targeting IO_FILE_HDL
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.
2019-10-31 07:59:35 +11:00
.equ IO_BLK @+FS_HANDLE_SIZE
apps/ed: start implementing I/O
2019-07-14 01:29:06 +10:00
; Buffer for lines read from I/O.
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.
2019-10-31 07:59:35 +11:00
.equ IO_LINE @+BLOCKDEV_SIZE
.equ IO_RAMEND @+IO_MAXLEN+1 ; +1 for null
apps/ed: start implementing I/O
2019-07-14 01:29:06 +10:00
; *** Code ***
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
; 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
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.
2019-10-31 07:59:35 +11:00
.fsGetB:
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
ld ix, IO_FILE_HDL
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.
2019-10-31 07:59:35 +11:00
jp fsGetB
.fsPutB:
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
ld ix, IO_FILE_HDL
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.
2019-10-31 07:59:35 +11:00
jp fsPutB
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
.blkdev:
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.
2019-10-31 07:59:35 +11:00
.dw .fsGetB, .fsPutB
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
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.
2019-10-31 07:59:35 +11:00
ioGetB:
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
push ix
ld ix, IO_BLK
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.
2019-10-31 07:59:35 +11:00
call _blkGetB
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
pop ix
ret
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.
2019-10-31 07:59:35 +11:00
ioPutB:
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
push ix
ld ix, IO_BLK
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.
2019-10-31 07:59:35 +11:00
call _blkPutB
ed: take filename as an argument This hard-binds ed to the filesystem (I liked the idea of working only with blockdevs though...), but this is necessary for the upcoming `w` command. We need some kind of way to tell the destination to write to truncate itself. This only has a meaning in the filesystem, but it's necessary to let the file know that its registered file size has possibly shrunk. I thought of alternatives that would have allowed me to keep ed blkdev-centered, but they were all too hackish to my own taste. Hence, this new hard-bind on files.
2019-07-21 09:35:19 +10:00
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
ed: Add 'w' command
2019-07-22 01:39:00 +10:00
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
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.
2019-10-31 07:59:35 +11:00
call ioPutB
ed: Add 'w' command
2019-07-22 01:39:00 +10:00
jr nz, .error
inc hl
jr .loop
.loopend:
; Wrote the whole line, write ending LF
ld a, 0x0a
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.
2019-10-31 07:59:35 +11:00
call ioPutB
ed: Add 'w' command
2019-07-22 01:39:00 +10:00
jr z, .end ; success
; continue to error
.error:
call unsetZ
.end:
pop hl
ret
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