Fix up parse word so that it can correctly handle empty arguments and (encode-bootpath) word so that it can handle optional

arguments. With these fixes in place we can now switch the boot word to use (encode-bootpath) which means that the bootpath and 
bootarg properties are now set exactly the same when executing boot and/or load.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@siriusit.co.uk>


git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@803 f158a5a8-5612-0410-a976-696ce0be7e32

forth/admin/userboot.fs

@@ -1,7 +1,7 @@
 \ 7.4.3.5 User commands for booting
 
 : boot    ( "{param-text}<cr>" -- )
-  linefeed parse cr
+  (encode-bootpath)
   s" platform-boot" $find if 
     execute
   else

forth/bootstrap/bootstrap.fs

@@ -704,6 +704,11 @@ variable span 0 span !
   >r              \ save delimiter
   ib >in @ +
   span @ >in @ -  \ ib+offs len-offset.
+  dup 0 < if      \ if we are already at the end of the string, return an empty string
+    + 0	          \ move to end of input string
+    r> drop
+    exit
+  then
   2dup r>         \ ib+offs len-offset ib+offs len-offset delim
   findchar if     \ look for the delimiter. 
     nip dup 1+

forth/debugging/client.fs

@@ -56,14 +56,22 @@ variable file-size
   ;
 
 : (encode-bootpath) ( "{params}<cr>" -- bootpath-str bootpath-len)
-  bl parse 2dup encode-string
+  \ Parse the current input buffer of a load/boot command and set both
+  \ the bootargs and bootpath properties as appropriate.
+  bl parse dup if
+    2dup encode-string
     " /chosen" (find-dev) if
       " bootpath" rot (property)
     then
-  linefeed parse encode-string
+  then
+  linefeed parse dup if
+    encode-string
     " /chosen" (find-dev) if
       " bootargs" rot (property)
     then
+  else
+    2drop
+  then
 ;
 
 : load    ( "{params}<cr>" -- )