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authorDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
committerDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
commit67d25d837ac55f28a366c0a3b262e439a6e75fc3 (patch)
treedf7715c7724c5935ab87c807f3b8b4ef529315e3 /amforth-6.5/common/lib/to-name.frt
parente0d6784e89dba33226c0edb815bb974486fa7c48 (diff)
Add AmForth
Diffstat (limited to 'amforth-6.5/common/lib/to-name.frt')
-rw-r--r--amforth-6.5/common/lib/to-name.frt21
1 files changed, 21 insertions, 0 deletions
diff --git a/amforth-6.5/common/lib/to-name.frt b/amforth-6.5/common/lib/to-name.frt
new file mode 100644
index 0000000..806dc21
--- /dev/null
+++ b/amforth-6.5/common/lib/to-name.frt
@@ -0,0 +1,21 @@
+\ go from the XT backwards to get the Name field
+: >name ( xt -- nfa )
+ 1- \ link address
+ \ tricky: we look for the flash cell whose address + it content & 0x00ff is
+ \ this address
+ dup 1- >r ( -- lfa )
+ $ff swap
+ begin
+ 1- dup ( -- cnt lfa lfa )
+ @i $00ff and 1+ 2/ ( -- cnt fla len )
+ over + ( cnt fla lfa? )
+ r@ = ( cnt fla lfa? )
+ rot 1- dup >r 0= or ( fla flag )
+ r> ( fla flag cnt )
+ swap ( fla cnt flag )
+ rot
+ swap
+ until
+ swap drop
+ r> drop
+;