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forth: add words "."" and "(print)"

This commit is contained in:
Virgil Dupras 2020-03-17 15:22:13 -04:00
parent a40926d710
commit 25b6e75cf7
2 changed files with 49 additions and 1 deletions

View File

@ -192,10 +192,55 @@ EMIT:
call stdioPutC
jp next
.db "(print)"
.dw EMIT
.db 0
PRINT:
.dw nativeWord
pop hl
call chkPS
call printstr
jp next
.db '.', '"'
.fill 5
.dw PRINT
.db 1 ; IMMEDIATE
PRINTI:
.dw nativeWord
ld hl, (HERE)
ld de, LIT
call DEinHL
ex de, hl ; (HERE) now in DE
ld hl, (INPUTPOS)
.loop:
ld a, (hl)
or a ; null? not cool
jp z, abort
cp '"'
jr z, .loopend
ld (de), a
inc hl
inc de
jr .loop
.loopend:
inc hl ; inputpos to char afterwards
ld (INPUTPOS), hl
; null-terminate LIT
inc de
xor a
ld (de), a
ex de, hl ; (HERE) in HL
ld de, PRINT
call DEinHL
ld (HERE), hl
jp next
; ( c port -- )
.db "PC!"
.fill 4
.dw EMIT
.dw PRINTI
.db 0
PSTORE:
.dw nativeWord

View File

@ -146,8 +146,11 @@ wait until another line is entered.
KEY input, however, is direct. Regardless of the input buffer's state, KEY will
return the next typed key.
(print) a -- Print string at addr a.
. n -- Print n in its decimal form
.X n -- Print n in its hexadecimal form. In hex, numbers
." xxx" -- *I* Compiles string literal xxx followed by a call
to (print)
are never considered negative. "-1 .X -> ffff"
EMIT c -- Spit char c to output stream
IN> -- a Address of variable containing current pos in input