Apple-2-SW/prodos-drivers
1
0
Fork 0
mirror of https://github.com/a2stuff/prodos-drivers.git synced 2024-12-21 14:29:18 +00:00
Code Issues Projects Releases Wiki Activity

Save name earlier

Browse Source
This commit is contained in:
Joshua Bell 2019-06-19 20:39:54 -07:00
parent 9b98a09067
commit d4466231f5
1 changed files with 48 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
ram.drv.system.s
View File

@ -70,10 +70,48 @@ sys_start:
;;; ============================================================
.proc setup
;; --------------------------------------------------
;; Save most recent device for later, when chaining
;; to next .SYSTEM file.
lda DEVNUM
sta devnum
;; --------------------------------------------------
;; Identify the name of this SYS file, which should be present at
;; $280 with or without a path prefix. Search pathname buffer
;; backwards for '/', then copy name into |self_name|.
;; Find '/' (which may not be present, prefix is optional)
ldx PATHNAME
beq no_name
ldy #0 ; Y = length
: lda PATHNAME,x
and #$7f ; ignore high bit
cmp #'/'
beq copy_name
iny
dex
bne :-
;; Copy name into |self_name| buffer
copy_name:
cpy #0
beq no_name
sty self_name
ldx PATHNAME
: lda PATHNAME,x
sta self_name,y
dex
dey
bne :-
;; Done
rts
no_name:
lda #0
sta self_name
rts
.endproc
@ -84,49 +122,22 @@ self_name: .res 16
;;; Find and invoke the next .SYSTEM file
;;; ============================================================
.proc launch_next
.proc quit
MLI_CALL QUIT, quit_params
.byte 0 ; crash if QUIT fails
DEFINE_QUIT_PARAMS quit_params
.endproc
.proc launch_next
ptr := $A5
num := $A7
len := $A8
;; --------------------------------------------------
;; Update reset vector - now terminates.
lda #<quit
sta $03F2
lda #>quit
sta $03F3
eor #$A5
sta $03F4
;; --------------------------------------------------
;; Identify the name of this SYS file, which should be present at
;; $280 with or without a path prefix. Search pathname buffer
;; backwards for '/', then copy name into |self_name|.
;; Find '/' (which may not be present, prefix is optional)
lda #0
sta len
ldx PATHNAME
beq read_dir
floop: inc len
dex
beq copy_name
lda PATHNAME,x
eor #'/'
asl a
bne floop
;; Copy name into |self_name| buffer
copy_name:
ldy #0
cloop: iny
inx
lda PATHNAME,x
sta self_name,y
cpy len
bcc cloop
sty self_name
;; Own name found? If not, just quit
lda self_name
beq quit
;; --------------------------------------------------
;; Read directory and look for .SYSTEM files; find this
@ -252,17 +263,6 @@ not_found:
jmp quit
.endproc
;;; ------------------------------------------------------------
;;; Invoke ProDOS QUIT routine.
.proc quit
MLI_CALL QUIT, quit_params
.byte 0 ; crash if QUIT fails
rts
DEFINE_QUIT_PARAMS quit_params
.endproc
;;; ------------------------------------------------------------
;;; Read a disk block.