mirror of
https://github.com/hsoft/collapseos.git
synced 2024-09-07 05:38:46 +10:00
141 lines
2.6 KiB
NASM
141 lines
2.6 KiB
NASM
; FS-related basic commands
|
|
; *** Variables ***
|
|
; Handle of the target file
|
|
.equ BFS_FILE_HDL BFS_RAMSTART
|
|
.equ BFS_RAMEND @+FS_HANDLE_SIZE
|
|
|
|
; Lists filenames in currently active FS
|
|
basFLS:
|
|
ld iy, .iter
|
|
jp fsIter
|
|
.iter:
|
|
ld a, FS_META_FNAME_OFFSET
|
|
call addHL
|
|
call printstr
|
|
jp printcrlf
|
|
|
|
|
|
basLDBAS:
|
|
call fsFindFN
|
|
ret nz
|
|
call bufInit
|
|
ld ix, BFS_FILE_HDL
|
|
call fsOpen
|
|
ld hl, 0
|
|
ld de, SCRATCHPAD
|
|
.loop:
|
|
ld ix, BFS_FILE_HDL
|
|
call fsGetB
|
|
jr nz, .loopend
|
|
inc hl
|
|
or a ; null? hum, weird. same as LF
|
|
jr z, .lineend
|
|
cp LF
|
|
jr z, .lineend
|
|
ld (de), a
|
|
inc de
|
|
jr .loop
|
|
.lineend:
|
|
; We've just finished reading a line, writing each char in the pad.
|
|
; Null terminate it.
|
|
xor a
|
|
ld (de), a
|
|
; Ok, line ready
|
|
push hl ; --> lvl 1. current file position
|
|
ld hl, SCRATCHPAD
|
|
call parseDecimal
|
|
jr nz, .notANumber
|
|
push ix \ pop de
|
|
call toSep
|
|
call rdSep
|
|
call bufAdd
|
|
pop hl ; <-- lvl 1
|
|
ret nz
|
|
ld de, SCRATCHPAD
|
|
jr .loop
|
|
.notANumber:
|
|
pop hl ; <-- lvl 1
|
|
ld de, SCRATCHPAD
|
|
jr .loop
|
|
.loopend:
|
|
cp a
|
|
ret
|
|
|
|
|
|
basFOPEN:
|
|
call rdExpr ; file handle index
|
|
ret nz
|
|
push ix \ pop de
|
|
ld a, e
|
|
call fsHandle
|
|
; DE now points to file handle
|
|
call rdSep
|
|
; HL now holds the string we look for
|
|
call fsFindFN
|
|
ret nz ; not found
|
|
; Found!
|
|
; FS_PTR points to the file we want to open
|
|
push de \ pop ix ; IX now points to the file handle.
|
|
jp fsOpen
|
|
|
|
; Takes one byte block number to allocate as well we one string arg filename
|
|
; and allocates a new file in the current fs.
|
|
basFNEW:
|
|
call rdExpr ; file block count
|
|
ret nz
|
|
call rdSep ; HL now points to filename
|
|
push ix \ pop de
|
|
ld a, e
|
|
jp fsAlloc
|
|
|
|
; Deletes filename with specified name
|
|
basFDEL:
|
|
call fsFindFN
|
|
ret nz
|
|
; Found! delete
|
|
jp fsDel
|
|
|
|
|
|
basPgmHook:
|
|
; Cmd to find is in (DE)
|
|
ex de, hl
|
|
; (HL) is suitable for a direct fsFindFN call
|
|
call fsFindFN
|
|
ret nz
|
|
; We have a file! Let's load it in memory
|
|
ld ix, BFS_FILE_HDL
|
|
call fsOpen
|
|
ld hl, 0 ; addr that we read in file handle
|
|
ld de, USER_CODE ; addr in mem we write to
|
|
.loop:
|
|
call fsGetB ; we use Z at end of loop
|
|
ld (de), a ; Z preserved
|
|
inc hl ; Z preserved in 16-bit
|
|
inc de ; Z preserved in 16-bit
|
|
jr z, .loop
|
|
; Ready to jump. Return .call in IX and basCallCmd will take care
|
|
; of setting (HL) to the arg string. .call then takes care of wrapping
|
|
; the USER_CODE call.
|
|
ld ix, .call
|
|
cp a ; ensure Z
|
|
ret
|
|
.call:
|
|
ld iy, USER_CODE
|
|
call callIY
|
|
call basR2Var
|
|
or a ; Z set only if A is zero
|
|
ret
|
|
|
|
basFSCmds:
|
|
.db "fls", 0
|
|
.dw basFLS
|
|
.db "ldbas", 0
|
|
.dw basLDBAS
|
|
.db "fopen", 0
|
|
.dw basFOPEN
|
|
.db "fnew", 0
|
|
.dw basFNEW
|
|
.db "fdel", 0
|
|
.dw basFDEL
|
|
.db 0xff ; end of table
|