Apple-2-SW/prodos-drivers
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open and prefix

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This commit is contained in:
Joshua Bell 2017-12-09 14:28:54 -08:00
parent dd6a4b319e
commit 714c796605
1 changed files with 45 additions and 34 deletions
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@ -96,17 +96,16 @@ L2000: jmp install_and_quit
mark_ref_num := $61
mark_position := $62 ; 3-bytes
next_device := $65 ; next device number to try
next_device_num := $65 ; next device number to try
current_entry := $67 ; index of current entry
num_entries := $68 ; length of |filenames|
curr_len := $69 ; length of current entry name
curr_ptr := $6C ; address of current entry name (in |filenames|)
page_start := $73 ; index of first entry shown on screen
prefix_depth := $6B ; 0 = root
max_entries := 128 ; max # of entries; more are ignored
types_table := $74 ; high bit clear = dir, set = sys
@ -140,47 +139,53 @@ L2000: jmp install_and_quit
lda #2
sta $60
ldx DEVCNT ; max device num
stx next_device
stx next_device_num
lda DEVNUM
bne L1042
bne check_device
check_device:
ldx next_device
next_device:
ldx next_device_num
lda DEVLST,x
cpx #1
bcs :+
ldx DEVCNT
inx
: dex
stx next_device
stx next_device_num
L1042: sta on_line_params_unit
check_device:
sta on_line_params_unit
MLI_CALL ON_LINE, on_line_params
bcs check_device
bcs next_device
stz $6B
stz prefix_depth
lda prefix+1
and #$0F
beq check_device
beq next_device
adc #$02
tax
L1059: stx prefix ; truncate prefix to length x
;; Resize prefix to length x and open the directory for reading
resize_prefix_and_open:
stx prefix
lda #'/'
sta prefix+1
sta prefix,x
stz prefix+1,x
MLI_CALL OPEN, open_params
bcc L107F
lda $6B
beq check_device
jsr BELL1
jsr L11DA
bcc :+
;; Open failed
lda prefix_depth ; root?
beq next_device
jsr BELL1 ; no, but failed; beep
jsr pop_prefix ; and go up a level
stx prefix
jmp keyboard_loop
L107F: inc $6B ; ???
;; Open succeeded
: inc prefix_depth
stz num_entries
lda open_params_ref_num
sta read_params_ref_num
@ -215,7 +220,7 @@ L10B9: lda mark_position+1
bcc L10CE
tay
sty $72
inc mark+position+1
inc mark_position+1
L10CC: inc mark_position+1
L10CE: dey
clc
@ -258,7 +263,7 @@ L1115: lda read_buffer,y
sta (curr_ptr),y
inc num_entries
bne L10B5
L1126: jmp check_device
L1126: jmp next_device
finish_read:
MLI_CALL CLOSE, close_params
@ -378,28 +383,34 @@ draw_current_line_inv:
;;; ------------------------------------------------------------
.proc on_escape
jsr L11DA
dec $6B
bra L11F1
jsr pop_prefix ; leaves length in X
dec prefix_depth
bra resize_prefix_and_open_jmp
.endproc
;;; ------------------------------------------------------------
L11DA: ldx prefix
L11DD: dex
;; Remove level from prefix; returns new length in X
.proc pop_prefix
ldx prefix
loop: dex
lda prefix,x
cmp #'/'
bne L11DD
bne loop
cpx #$01
bne L11EC
bne done
ldx prefix
L11EC: rts
done: rts
.endproc
next_drive:
jmp check_device
jmp next_device
L11F0: inx
L11F1: jmp L1059
dec_resize_prefix_and_open:
inx
resize_prefix_and_open_jmp:
jmp resize_prefix_and_open
;;; ------------------------------------------------------------
@ -420,7 +431,7 @@ L11F1: jmp L1059
ldy current_entry
lda types_table,y
bpl L11F0 ; is directory???
bpl dec_resize_prefix_and_open ; is directory???
;; nope, system file, so...
;; fall through