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prodos-path
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PATH: Shave 9 bytes

This commit is contained in:
Joshua Bell 2024-01-02 22:17:14 -08:00
parent af1c8f1865
commit 0c01446574
2 changed files with 31 additions and 17 deletions
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3
README.md
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@ -36,6 +36,9 @@ Example:
Notes: Notes:
* `PATH` can be invoked as lower case (e.g. `path /hd/cmd`) * `PATH` can be invoked as lower case (e.g. `path /hd/cmd`)
* Commands can be invoked as lower case (e.g. `hello`) * Commands can be invoked as lower case (e.g. `hello`)
* A relative `PATH` (e.g. `path bin`) only works if an explicit prefix is set.
* Note that if no prefix has been set, or if you run `prefix /`, BASIC.SYSTEM will use the last accessed slot and drive and the `PREFIX` command will report that volume as a prefix even though it is empty.
Sample commands included: Sample commands included:
* `HELLO` - shows a short message, for testing purposes * `HELLO` - shows a short message, for testing purposes

45
path.s
View File

@ -330,7 +330,7 @@ notok: dey
;; Indicate end of command string for BI's parser (if command uses it) ;; Indicate end of command string for BI's parser (if command uses it)
dex dex
stx XLEN stx xlen ; assigned to `XLEN` later
;; Check to see if path exists. ;; Check to see if path exists.
lda #$A ; param length lda #$A ; param length
@ -345,14 +345,11 @@ notok: dey
bne compose ; wrong type - try next path directory bne compose ; wrong type - try next path directory
;; Tell BASIC.SYSTEM it was handled. ;; Tell BASIC.SYSTEM it was handled.
lda #0 ldx #xtrnaddr_len - 1
sta XCNUM : lda xtrnaddr,x
sta PBITS sta XTRNADDR,x
sta PBITS+1 dex
lda #<XRETURN bpl :-
sta XTRNADDR
lda #>XRETURN
sta XTRNADDR+1
;; MLI/BI trashes part of INBUF (clock driver?), so stash it in upper half. ;; MLI/BI trashes part of INBUF (clock driver?), so stash it in upper half.
ldx #$7F ldx #$7F
@ -374,14 +371,12 @@ notok: dey
sta RWREFNUM sta RWREFNUM
sta CFREFNUM sta CFREFNUM
lda #<cmd_load_addr ;; Assign `RWDATA` and `RWCOUNT`
sta RWDATA ldx #rwdata_len - 1
lda #>cmd_load_addr : lda rwdata,x
sta RWDATA+1 sta RWDATA,x
lda #<max_cmd_size dex
sta RWCOUNT bpl :-
lda #>max_cmd_size
sta RWCOUNT+1
lda #READ lda #READ
jsr GOSYSTEM jsr GOSYSTEM
@ -407,6 +402,22 @@ notok: dey
fail_load: fail_load:
rts rts
;;; Assigned to `XTRNADDR`, `XLEN`, `XCNUM`, and `PBITS`
xtrnaddr:
.addr XRETURN ; assigned to `XTRNADDR`
xlen: .byte 0 ; assigned to `XLEN`
.byte 0 ; assigned to `XCNUM`
.word 0 ; assigned to `PBITS`
xtrnaddr_len = * - xtrnaddr
;;; Assigned to `RWDATA` and `RWCOUNT`
rwdata:
.addr cmd_load_addr ; assigned to `RWDATA`
.word max_cmd_size ; assigned to `RWCOUNT`
rwdata_len = * - rwdata
;;; ============================================================ ;;; ============================================================
execute: execute: