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Use file I/O rather than block I/O to read dir

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This commit is contained in:
Joshua Bell 2019-06-21 15:25:11 -07:00
parent d4466231f5
commit f380680cdd
1 changed files with 71 additions and 58 deletions
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129
ram.drv.system.s
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@ -129,7 +129,21 @@ self_name: .res 16
DEFINE_QUIT_PARAMS quit_params DEFINE_QUIT_PARAMS quit_params
.endproc .endproc
online_buf := $1C00
io_buf := $1C00
dir_buf := $2000
block_len = $200
DEFINE_ON_LINE_PARAMS on_line_params,,online_buf
DEFINE_OPEN_PARAMS open_params, PATHNAME, io_buf
DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
DEFINE_READ_PARAMS read_block_params, dir_buf, block_len
DEFINE_CLOSE_PARAMS close_params
.proc launch_next .proc launch_next
;; Read directory and look for .SYSTEM files; find this
;; one, and invoke the following one.
ptr := $A5 ptr := $A5
num := $A7 num := $A7
len := $A8 len := $A8
@ -138,25 +152,53 @@ self_name: .res 16
;; Own name found? If not, just quit ;; Own name found? If not, just quit
lda self_name lda self_name
beq quit beq quit
;; -------------------------------------------------- ;; --------------------------------------------------
;; Read directory and look for .SYSTEM files; find this ;; Find name of boot device, copy into PATHNAME
;; one, and invoke the following one.
read_dir:
lda devnum lda devnum
sta read_block_params_unit_num sta on_line_params::unit_num
jsr read_block MLI_CALL ON_LINE, on_line_params
bcc :+
jmp on_error
lda data_buf + VolumeDirectoryHeader::entry_length : lda #'/' ; Prefix by '/'
sta PATHNAME+1
lda online_buf
and #$0F ; Mask off length
sta PATHNAME
ldx #0 ; Copy name
: lda online_buf+1,x
sta PATHNAME+2,x
inx
cpx PATHNAME
bne :-
inx ; One more for '/' prefix
stx PATHNAME
;; Open directory
MLI_CALL OPEN, open_params
bcc :+
jmp on_error
: lda open_params::ref_num
sta read_block_params::ref_num
sta close_params::ref_num
;; Read first "block"
MLI_CALL READ, read_block_params
bcc :+
jmp on_error
;; Get sizes out of header
: lda dir_buf + VolumeDirectoryHeader::entry_length
sta entry_length_mod sta entry_length_mod
lda data_buf + VolumeDirectoryHeader::entries_per_block lda dir_buf + VolumeDirectoryHeader::entries_per_block
sta entries_per_block_mod sta entries_per_block_mod
lda #1 lda #1
sta num sta num
lda #<(data_buf + .sizeof(VolumeDirectoryHeader)) ;; Set up pointers to entry
lda #<(dir_buf + .sizeof(VolumeDirectoryHeader))
sta ptr sta ptr
lda #>(data_buf + .sizeof(VolumeDirectoryHeader)) lda #>(dir_buf + .sizeof(VolumeDirectoryHeader))
sta ptr+1 sta ptr+1
;; Process directory entry ;; Process directory entry
@ -208,40 +250,34 @@ next: lda ptr
entries_per_block_mod := *-1 entries_per_block_mod := *-1
bcc entry bcc entry
lda data_buf + VolumeDirectoryHeader::next_block ;; Read next "block"
sta read_block_params_block_num MLI_CALL READ, read_block_params
lda data_buf + VolumeDirectoryHeader::next_block + 1 bcs not_found
sta read_block_params_block_num+1
ora read_block_params_block_num ;; Set up pointers to entry
beq not_found ; last block has next=0 : lda #0
jsr read_block
lda #0
sta num sta num
lda #<(data_buf + $04) lda #<(dir_buf + $04)
sta ptr sta ptr
lda #>(data_buf + $04) lda #>(dir_buf + $04)
sta ptr+1 sta ptr+1
jmp entry jmp entry
;; --------------------------------------------------
;; Found a .SYSTEM file which is not this one; invoke ;; Found a .SYSTEM file which is not this one; invoke
;; it if follows this one. ;; it if follows this one.
handle_sys_file: handle_sys_file:
bit found_self_flag bit found_self_flag
bpl next bpl next
;; Compose the path to invoke. First walk self path MLI_CALL CLOSE, close_params
;; backwards to '/'.
ldx PATHNAME
beq append
: dex
beq append
lda PATHNAME,x
eor #'/'
asl a
bne :-
;; Now append name of found file. ;; Compose the path to invoke.
append: ldy #0 ldx PATHNAME
inx
lda #'/'
sta PATHNAME,x
ldy #0
: iny : iny
inx inx
lda (ptr),y lda (ptr),y
@ -249,6 +285,7 @@ append: ldy #0
cpy len cpy len
bcc :- bcc :-
stx PATHNAME stx PATHNAME
jmp invoke_system_file jmp invoke_system_file
not_found: not_found:
@ -263,20 +300,6 @@ not_found:
jmp quit jmp quit
.endproc .endproc
;;; ------------------------------------------------------------
;;; Read a disk block.
.proc read_block
MLI_CALL READ_BLOCK, read_block_params
bcs on_error
rts
.endproc
;; block 2 is volume directory
DEFINE_READ_BLOCK_PARAMS read_block_params, data_buf, 2
read_block_params_unit_num := read_block_params::unit_num
read_block_params_block_num := read_block_params::block_num
;;; ------------------------------------------------------------ ;;; ------------------------------------------------------------
;;; Load/execute the system file in PATHNAME ;;; Load/execute the system file in PATHNAME
@ -284,8 +307,8 @@ not_found:
MLI_CALL OPEN, open_params MLI_CALL OPEN, open_params
bcs on_error bcs on_error
lda open_params_ref_num lda open_params::ref_num
sta read_params_ref_num sta read_params::ref_num
MLI_CALL READ, read_params MLI_CALL READ, read_params
bcs on_error bcs on_error
@ -319,16 +342,6 @@ not_found:
jmp quit jmp quit
.endproc .endproc
;;; ------------------------------------------------------------
DEFINE_OPEN_PARAMS open_params, PATHNAME, data_buf
open_params_ref_num := open_params::ref_num
DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
read_params_ref_num := read_params::ref_num
DEFINE_CLOSE_PARAMS close_params
;;; ============================================================ ;;; ============================================================
;;; Data ;;; Data