mirror of
https://github.com/a2stuff/prodos-drivers.git
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Use file I/O rather than block I/O to read dir
This commit is contained in:
Joshua Bell
parent
d4466231f5
commit
f380680cdd
129
ram.drv.system.s
129
ram.drv.system.s
@ -129,7 +129,21 @@ self_name: .res 16
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DEFINE_QUIT_PARAMS quit_params
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.endproc
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online_buf := $1C00
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io_buf := $1C00
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dir_buf := $2000
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block_len = $200
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DEFINE_ON_LINE_PARAMS on_line_params,,online_buf
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DEFINE_OPEN_PARAMS open_params, PATHNAME, io_buf
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DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
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DEFINE_READ_PARAMS read_block_params, dir_buf, block_len
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DEFINE_CLOSE_PARAMS close_params
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.proc launch_next
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;; Read directory and look for .SYSTEM files; find this
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;; one, and invoke the following one.
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ptr := $A5
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num := $A7
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len := $A8
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@ -138,25 +152,53 @@ self_name: .res 16
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;; Own name found? If not, just quit
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lda self_name
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beq quit
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;; --------------------------------------------------
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;; Read directory and look for .SYSTEM files; find this
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;; one, and invoke the following one.
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read_dir:
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;; Find name of boot device, copy into PATHNAME
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lda devnum
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sta read_block_params_unit_num
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jsr read_block
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sta on_line_params::unit_num
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MLI_CALL ON_LINE, on_line_params
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bcc :+
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jmp on_error
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lda data_buf + VolumeDirectoryHeader::entry_length
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: lda #'/' ; Prefix by '/'
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sta PATHNAME+1
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lda online_buf
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and #$0F ; Mask off length
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sta PATHNAME
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ldx #0 ; Copy name
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: lda online_buf+1,x
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sta PATHNAME+2,x
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inx
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cpx PATHNAME
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bne :-
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inx ; One more for '/' prefix
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stx PATHNAME
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;; Open directory
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MLI_CALL OPEN, open_params
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bcc :+
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jmp on_error
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: lda open_params::ref_num
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sta read_block_params::ref_num
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sta close_params::ref_num
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;; Read first "block"
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MLI_CALL READ, read_block_params
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bcc :+
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jmp on_error
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;; Get sizes out of header
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: lda dir_buf + VolumeDirectoryHeader::entry_length
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sta entry_length_mod
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lda data_buf + VolumeDirectoryHeader::entries_per_block
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lda dir_buf + VolumeDirectoryHeader::entries_per_block
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sta entries_per_block_mod
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lda #1
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sta num
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lda #<(data_buf + .sizeof(VolumeDirectoryHeader))
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;; Set up pointers to entry
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lda #<(dir_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr
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lda #>(data_buf + .sizeof(VolumeDirectoryHeader))
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lda #>(dir_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr+1
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;; Process directory entry
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@ -208,40 +250,34 @@ next: lda ptr
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entries_per_block_mod := *-1
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bcc entry
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lda data_buf + VolumeDirectoryHeader::next_block
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sta read_block_params_block_num
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lda data_buf + VolumeDirectoryHeader::next_block + 1
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sta read_block_params_block_num+1
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ora read_block_params_block_num
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beq not_found ; last block has next=0
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jsr read_block
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lda #0
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;; Read next "block"
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MLI_CALL READ, read_block_params
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bcs not_found
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;; Set up pointers to entry
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: lda #0
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sta num
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lda #<(data_buf + $04)
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lda #<(dir_buf + $04)
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sta ptr
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lda #>(data_buf + $04)
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lda #>(dir_buf + $04)
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sta ptr+1
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jmp entry
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;; --------------------------------------------------
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;; Found a .SYSTEM file which is not this one; invoke
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;; it if follows this one.
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handle_sys_file:
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bit found_self_flag
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bpl next
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;; Compose the path to invoke. First walk self path
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;; backwards to '/'.
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ldx PATHNAME
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beq append
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: dex
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beq append
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lda PATHNAME,x
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eor #'/'
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asl a
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bne :-
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MLI_CALL CLOSE, close_params
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;; Now append name of found file.
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append: ldy #0
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;; Compose the path to invoke.
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ldx PATHNAME
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inx
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lda #'/'
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sta PATHNAME,x
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ldy #0
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: iny
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inx
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lda (ptr),y
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@ -249,6 +285,7 @@ append: ldy #0
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cpy len
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bcc :-
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stx PATHNAME
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jmp invoke_system_file
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not_found:
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@ -263,20 +300,6 @@ not_found:
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jmp quit
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.endproc
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;;; ------------------------------------------------------------
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;;; Read a disk block.
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.proc read_block
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MLI_CALL READ_BLOCK, read_block_params
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bcs on_error
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rts
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.endproc
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;; block 2 is volume directory
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DEFINE_READ_BLOCK_PARAMS read_block_params, data_buf, 2
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read_block_params_unit_num := read_block_params::unit_num
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read_block_params_block_num := read_block_params::block_num
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;;; ------------------------------------------------------------
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;;; Load/execute the system file in PATHNAME
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@ -284,8 +307,8 @@ not_found:
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MLI_CALL OPEN, open_params
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bcs on_error
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lda open_params_ref_num
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sta read_params_ref_num
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lda open_params::ref_num
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sta read_params::ref_num
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MLI_CALL READ, read_params
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bcs on_error
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@ -319,16 +342,6 @@ not_found:
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jmp quit
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.endproc
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;;; ------------------------------------------------------------
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DEFINE_OPEN_PARAMS open_params, PATHNAME, data_buf
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open_params_ref_num := open_params::ref_num
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DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
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read_params_ref_num := read_params::ref_num
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DEFINE_CLOSE_PARAMS close_params
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;;; ============================================================
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;;; Data
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