--- gforth/blocks.fs	2007/02/18 18:51:40	1.48
+++ gforth/blocks.fs	2012/05/26 10:20:01	1.61
@@ -1,12 +1,12 @@
 \ A less simple implementation of the blocks wordset. 
 
-\ Copyright (C) 1995,1996,1997,1998,2000,2003,2006 Free Software Foundation, Inc.
+\ Copyright (C) 1995,1996,1997,1998,2000,2003,2006,2007,2008,2011 Free Software Foundation, Inc.
 
 \ This file is part of Gforth.
 
 \ Gforth is free software; you can redistribute it and/or
 \ modify it under the terms of the GNU General Public License
-\ as published by the Free Software Foundation; either version 2
+\ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.
 
 \ This program is distributed in the hope that it will be useful,
@@ -15,8 +15,7 @@
 \ GNU General Public License for more details.
 
 \ You should have received a copy of the GNU General Public License
-\ along with this program; if not, write to the Free Software
-\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+\ along with this program. If not, see http://www.gnu.org/licenses/.
 
 
 \ A more efficient implementation would use mmap on OSs that
@@ -79,8 +78,7 @@ Defer flush-blocks ( -- ) \ gforth
 	2dup open-fpath-file throw
 	rot close-file throw  2dup file-status throw bin open-file throw
 	>r 2drop r>
-    restore endtry
-    dup if ( c-addr u ior )
+    endtry-iferror ( c-addr u ior )
 	>r 2dup file-status nip 0= r> and throw \ does it really not exist?
 	r/w bin create-file throw
     then
@@ -91,7 +89,7 @@ Defer flush-blocks ( -- ) \ gforth
 
 : use ( "file" -- ) \ gforth
     \g Use @i{file} as the blocks file.
-    name open-blocks ;
+    name name-too-short? open-blocks ;
 
 \ the file is opened as binary file, since it either will contain text
 \ without newlines or binary data
@@ -126,7 +124,7 @@ Defer flush-blocks ( -- ) \ gforth
     rdrop ;
 
 : empty-buffer ( buffer -- ) \ gforth
-    buffer-block off ;
+    dup buffer-block on buffer-dirty off ;
 
 : save-buffers  ( -- ) \ block
     \G Transfer the contents of each @code{update}d block buffer to
@@ -152,7 +150,7 @@ Defer flush-blocks ( -- ) \ gforth
 : get-buffer ( u -- a-addr ) \ gforth
     0 buffers um/mod drop buffer-struct %size * block-buffers @ + ;
 
-: block ( u -- a-addr ) \ gforthman- block
+: block ( u -- a-addr ) \ block
     \G If a block buffer is assigned for block @i{u}, return its
     \G start address, @i{a-addr}. Otherwise, assign a block buffer
     \G for block @i{u} (if the assigned block buffer has been
@@ -190,7 +188,7 @@ Defer flush-blocks ( -- ) \ gforth
     block ;
 
 User scr ( -- a-addr ) \ block-ext s-c-r
-    \G @code{User} variable -- @i{a-addr} is the address of a cell containing
+    \G @code{User} variable containing
     \G the block number of the block most recently processed by
     \G @code{list}.
 0 scr !
@@ -210,9 +208,9 @@ User scr ( -- a-addr ) \ block-ext s-c-r
     dup scr !
     ." Screen " u.
     scr @ updated?  0= IF ." not "  THEN  ." modified     " cr
-    16 0
+    l/s 0
     ?do
-	i 2 .r space scr @ block i 64 * chars + 64 type cr
+	i 2 .r space scr @ block i c/l * chars + c/l type cr
     loop ;
 
 [IFDEF] current-input
@@ -225,10 +223,9 @@ User scr ( -- a-addr ) \ block-ext s-c-r
 
 Create block-input   A, A, A, A, A,
 
-: load  ( i*x n -- j*x ) \ block
-    \G Save the current input source specification. Store @i{n} in
-    \G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse
-    \G area is exhausted, restore the input source specification.
+: load  ( i*x u -- j*x ) \ block
+    \g Text-interpret block @i{u}.  Block 0 cannot be @code{load}ed.
+    dup 0= -35 and throw
     block-input 0 new-tib dup loadline ! blk !  s" * a block*" loadfilename 2!
     ['] interpret catch pop-file throw ;
 [ELSE]
@@ -242,10 +239,9 @@ Create block-input   A, A, A, A, A,
 \G @i{c-addr} is the address of the input buffer and @i{u} is the
 \G number of characters in it.
 
-: load ( i*x n -- j*x ) \ block
-    \G Save the current input source specification. Store @i{n} in
-    \G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse
-    \G area is exhausted, restore the input source specification.
+: load ( i*x u -- j*x ) \ block
+    \g Text-interpret block @i{u}.  Block 0 cannot be @code{load}ed.
+    dup 0= -35 and throw
     s" * a block*" loadfilename>r
     push-file
     dup loadline ! blk ! >in off ['] interpret catch
@@ -293,7 +289,7 @@ Create block-input   A, A, A, A, A,
 \     0= IF  block-included  ELSE  included  THEN ;
 
 get-current environment-wordlist set-current
-true constant block
+true constant block \ environment- environment
 true constant block-ext
 set-current