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80d730318a
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1
blk/044
1
blk/044
@ -2,4 +2,3 @@ INTERPRET -- Get a line from stdin, compile it in tmp memory,
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then execute the compiled contents.
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LEAVE -- In a DO..LOOP, exit at the next LOOP call.
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QUIT -- Return to interpreter prompt immediately
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EXIT! -- Exit current INTERPRET loop.
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4
blk/062
4
blk/062
@ -1,5 +1,7 @@
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WORD -- a Read one word from buffered input and push its
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addr.
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addr. Always null terminated. If ASCII EOT is
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encountered, a will point to it (it is cons-
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idered a word).
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There are also ascii const emitters:
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BS CR LF SPC CRLF
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NL is an indirect word (see B80) that aliases to CRLF by
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10
blk/405
10
blk/405
@ -1,9 +1,7 @@
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: WS? 33 < ;
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: EOT? 4 = ; ( 4 == ASCII EOT, CTRL+D )
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: TOWORD
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BEGIN
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C< DUP WS? NOT IF EXIT THEN DROP
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AGAIN
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;
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0 ( dummy ) BEGIN
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DROP C< DUP WS? NOT OVER EOT? OR
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UNTIL ;
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15
blk/406
15
blk/406
@ -1,16 +1,13 @@
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( Read word from C<, copy to WORDBUF, null-terminate, and
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return WORDBUF. )
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: WORD
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0x0e RAM+ ( 0e == WORDBUF )
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TOWORD ( a c )
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0x0e RAM+ TOWORD ( a c )
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DUP EOT? IF OVER ! EXIT THEN
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BEGIN
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( We take advantage of the fact that char MSB is
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always zero to pre-write our null-termination )
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OVER ! 1+ ( a+1 )
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C< ( a c )
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OVER ! 1+ C< ( a c )
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OVER 0x2d ( 2e-1 for NULL ) RAM+ = OVER WS? OR
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UNTIL
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( a this point, PS is: a WS )
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( null-termination is already written )
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2DROP
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0x0e RAM+ ;
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UNTIL ( a c )
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SWAP DROP 0x0e RAM+ ( ws a )
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SWAP EOT? IF 4 OVER ! THEN ;
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11
blk/409
11
blk/409
@ -1,16 +1,7 @@
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: INTERPRET
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BEGIN
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WORD
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WORD DUP C@ EOT? IF DROP EXIT THEN
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(find)
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NOT IF (parse) ELSE EXECUTE THEN
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C<? NOT IF LIT< (ok) (find) IF EXECUTE THEN THEN
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AGAIN ;
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( Drop RSP until I-2 == INTERPRET. )
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: EXIT!
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['] INTERPRET ( I )
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BEGIN ( I )
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DUP ( I I )
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R> DROP I 2- @ ( I I a )
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= UNTIL
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DROP ;
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3
blk/411
3
blk/411
@ -9,6 +9,5 @@
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['] (boot<) 0x0c RAM+ !
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( boot< always has a char waiting. 06 == C<?* )
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1 0x06 RAM+ !
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INTERPRET
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;
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INTERPRET BYE ;
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4
blk/429
4
blk/429
@ -1,8 +1,8 @@
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( Read one line in input buffer and make IN> point to it )
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: (rdln)
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(infl) BEGIN (rdlnc) NOT UNTIL
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( EOT or less triggers line flush )
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(infl) BEGIN (rdlnc) 5 < UNTIL
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LF IN( IN> ! ;
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( And finally, implement C<* )
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: RDLN<
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IN> @ C@
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11
blk/432
11
blk/432
@ -1,14 +1,3 @@
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: _
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(boot<)
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DUP 4 = IF
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( We drop our char, but also "a" from WORD: it won't
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have the opportunity to balance PSP because we're
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EXIT!ing. )
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2DROP
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( We're finished interpreting )
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EXIT!
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THEN
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;
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( pre-comment for tight LOAD: The 0x08==I check after INTERPRET
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is to check whether we're restoring to "_", the word above.
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if yes, then we're in a nested load. Also, the 1 in 0x06 is
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2
blk/433
2
blk/433
@ -5,7 +5,7 @@
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0x2e RAM+ @ >R ( boot ptr )
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BLK@
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BLK( 0x2e RAM+ ! ( Point to beginning of BLK )
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['] _ 0x08 RAM+ !
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['] (boot<) 0x08 RAM+ !
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1 0x06 RAM+ ! ( 06 == C<? )
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INTERPRET
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R> 0x2e RAM+ ! R> 0x06 RAM+ !
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BIN
emul/forth.bin
BIN
emul/forth.bin
Binary file not shown.
11
emul/forth.c
11
emul/forth.c
@ -17,7 +17,6 @@
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#define BLK_PORT 0x03
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#define BLKDATA_PORT 0x04
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static int running;
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static FILE *fp;
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static FILE *blkfp;
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static int retcode = 0;
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@ -27,18 +26,14 @@ static uint8_t iord_stdio()
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{
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int c = getc(fp);
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if (c == EOF) {
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running = 0;
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c = 4; // ASCII EOT
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}
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return (uint8_t)c;
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}
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static void iowr_stdio(uint8_t val)
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{
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if (val == 0x04) { // CTRL+D
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running = 0;
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} else {
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putchar(val);
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}
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}
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static void iowr_ret(uint8_t val)
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@ -123,9 +118,7 @@ int main(int argc, char *argv[])
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}
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// Run!
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running = 1;
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while (running && emul_step());
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while (emul_step());
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if (tty) {
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printf("\nDone!\n");
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