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289037a3dd
HL, instead of being preserved, is set to the character following the last read character.
141 lines
2.5 KiB
NASM
141 lines
2.5 KiB
NASM
; FS-related basic commands
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; *** Variables ***
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; Handle of the target file
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.equ BFS_FILE_HDL BFS_RAMSTART
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.equ BFS_RAMEND @+FS_HANDLE_SIZE
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; Lists filenames in currently active FS
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basFLS:
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ld iy, .iter
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jp fsIter
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.iter:
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ld a, FS_META_FNAME_OFFSET
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call addHL
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call printstr
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jp printcrlf
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basLDBAS:
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call fsFindFN
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ret nz
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call bufInit
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ld ix, BFS_FILE_HDL
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call fsOpen
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ld hl, 0
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ld de, SCRATCHPAD
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.loop:
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ld ix, BFS_FILE_HDL
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call fsGetB
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jr nz, .loopend
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inc hl
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or a ; null? hum, weird. same as LF
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jr z, .lineend
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cp LF
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jr z, .lineend
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ld (de), a
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inc de
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jr .loop
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.lineend:
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; We've just finished reading a line, writing each char in the pad.
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; Null terminate it.
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xor a
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ld (de), a
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; Ok, line ready
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push hl ; --> lvl 1. current file position
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ld hl, SCRATCHPAD
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call parseDecimalC
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jr nz, .notANumber
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call rdSep
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call bufAdd
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pop hl ; <-- lvl 1
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ret nz
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ld de, SCRATCHPAD
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jr .loop
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.notANumber:
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pop hl ; <-- lvl 1
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ld de, SCRATCHPAD
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jr .loop
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.loopend:
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cp a
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ret
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basFOPEN:
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call rdExpr ; file handle index
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ret nz
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push ix \ pop de
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ld a, e
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call fsHandle
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; DE now points to file handle
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call rdSep
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; HL now holds the string we look for
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call fsFindFN
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ret nz ; not found
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; Found!
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; FS_PTR points to the file we want to open
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push de \ pop ix ; IX now points to the file handle.
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jp fsOpen
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; Takes one byte block number to allocate as well we one string arg filename
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; and allocates a new file in the current fs.
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basFNEW:
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call rdExpr ; file block count
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ret nz
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call rdSep ; HL now points to filename
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push ix \ pop de
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ld a, e
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jp fsAlloc
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; Deletes filename with specified name
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basFDEL:
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call fsFindFN
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ret nz
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; Found! delete
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jp fsDel
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basPgmHook:
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; Cmd to find is in (DE)
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ex de, hl
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; (HL) is suitable for a direct fsFindFN call
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call fsFindFN
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ret nz
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; We have a file! Let's load it in memory
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ld ix, BFS_FILE_HDL
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call fsOpen
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ld hl, 0 ; addr that we read in file handle
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ld de, USER_CODE ; addr in mem we write to
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.loop:
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call fsGetB ; we use Z at end of loop
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ld (de), a ; Z preserved
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inc hl ; Z preserved in 16-bit
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inc de ; Z preserved in 16-bit
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jr z, .loop
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; Ready to jump. Return .call in IX and basCallCmd will take care
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; of setting (HL) to the arg string. .call then takes care of wrapping
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; the USER_CODE call.
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ld ix, .call
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cp a ; ensure Z
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ret
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.call:
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ld iy, USER_CODE
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call callIY
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call basR2Var
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or a ; Z set only if A is zero
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ret
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basFSCmds:
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.db "fls", 0
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.dw basFLS
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.db "ldbas", 0
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.dw basLDBAS
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.db "fopen", 0
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.dw basFOPEN
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.db "fnew", 0
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.dw basFNEW
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.db "fdel", 0
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.dw basFDEL
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.db "fson", 0
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.dw fsOn
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.db 0xff ; end of table
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