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shell: make arg in peek/poke mandatory

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Also, make `0` mean `0x100`.
This commit is contained in:
Virgil Dupras 2019-06-17 08:18:28 -04:00
parent 5e31de0bac
commit bd2877e012
1 changed files with 6 additions and 18 deletions
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24
kernel/shell.asm
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@ -295,22 +295,17 @@ shellMptr:
ret
; peek byte where memory pointer points to any display its value. If the
; optional numerical byte arg is supplied, this number of bytes will be printed
; peek the number of bytes specified by argument where memory pointer points to
; and display their value. If 0 is specified, 0x100 bytes are peeked.
;
; Example: peek 2 (will print 2 bytes)
shellPeekCmd:
.db "peek", 0b101, 0, 0
.db "peek", 0b001, 0, 0
shellPeek:
push bc
push de
push hl
ld a, (hl)
cp 0
jr nz, .arg1isset ; if arg1 is set, no need for a default
ld a, 1 ; default for arg1
.arg1isset:
ld b, a
ld hl, (SHELL_MEM_PTR)
.loop: ld a, (hl)
@ -321,26 +316,19 @@ shellPeek:
.end:
pop hl
pop de
pop bc
xor a
ret
; poke byte where memory pointer points and set them to bytes types through
; stdioGetC. If the optional numerical byte arg is supplied, this number of
; bytes will be expected from stdioGetC. Blocks until all bytes have been
; fetched.
; poke specified number of bytes where memory pointer points and set them to
; bytes typed through stdioGetC. Blocks until all bytes have been fetched.
shellPokeCmd:
.db "poke", 0b101, 0, 0
.db "poke", 0b001, 0, 0
shellPoke:
push bc
push hl
ld a, (hl)
or a ; cp 0
jr nz, .arg1isset ; if arg1 is set, no need for a default
ld a, 1 ; default for arg1
.arg1isset:
ld b, a
ld hl, (SHELL_MEM_PTR)
.loop: call stdioGetC