--- gforth/environ.fs	1994/02/11 16:30:46	1.1
+++ gforth/environ.fs	2001/09/16 10:20:39	1.27
@@ -1,42 +1,117 @@
-\ ENVIRON.FS   Answer environmental queries            20may93jaw
+\ environmental queries
 
-\ May be cross-compiled
+\ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
 
-decimal
+\ This file is part of Gforth.
 
-AVARIABLE EnvLink 0 EnvLink !
+\ 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
+\ of the License, or (at your option) any later version.
 
-: (env)
-       EnvLink linked
-       dup c, here over chars allot swap move align
-       , ;
-
-: (2env)
-       EnvLink linked
-       dup $80 or
-       c, here over chars allot swap move align
-       , , ; 
-
-: env" ( n -- )
-       State @
-       IF   postpone S" postpone (env)
-       ELSE [char] " parse (env) THEN ; immediate
-
-: 2env" ( d -- )
-       State @
-       IF   postpone S" postpone (2env)
-       ELSE [char] " parse (2env) THEN ; immediate
-
-
-: environment?  EnvLink
-                BEGIN   @ dup
-                WHILE   dup cell+ count $1f and
-                        4 pick 4 pick compare 0=
-                        IF      nip nip cell+ count dup -rot
-                                $1f and + aligned
-                                swap $80 and IF 2@ ELSE @ THEN
-                                EXIT
-                        THEN
-                REPEAT
-                drop 2drop false ;
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ 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.
+
+\ wordlist constant environment-wordlist
+
+vocabulary environment ( -- ) \ gforth
+\ for win32forth compatibility
+
+' environment >body constant environment-wordlist ( -- wid ) \ gforth
+  \G @i{wid} identifies the word list that is searched by environmental
+  \G queries.
+
+
+: environment? ( c-addr u -- false / ... true ) \ core environment-query
+    \G @i{c-addr, u} specify a counted string. If the string is not
+    \G recognised, return a @code{false} flag. Otherwise return a
+    \G @code{true} flag and some (string-specific) information about
+    \G the queried string.
+    environment-wordlist search-wordlist if
+	execute true
+    else
+	false
+    endif ;
+
+: e? name environment? 0= ABORT" environmental dependency not existing" ;
+
+: $has? environment? 0= IF false THEN ;
+
+: has? name $has? ;
+
+environment-wordlist set-current
+get-order environment-wordlist swap 1+ set-order
+
+\ assumes that chars, cells and doubles use an integral number of aus
+
+\ this should be computed in C as CHAR_BITS/sizeof(char),
+\ but I don't know any machine with gcc where an au does not have 8 bits.
+8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
+\G Size of one address unit, in bits.
+
+1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment
+\G Maximum value of any character in the character set
+
+MAX-CHAR constant /COUNTED-STRING ( -- n ) \ environment
+\G Maximum size of a counted string, in characters.
+
+ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD ( -- n ) \ environment
+\G Size of the pictured numeric string output buffer, in characters.
+
+&84 constant /PAD ( -- n ) \ environment
+\G Size of the scratch area pointed to by @code{PAD}, in characters.
+
+true constant CORE ( -- f ) \ environment
+\G True if the complete core word set is present. Always true for Gforth.
+
+true constant CORE-EXT ( -- f ) \ environment
+\G True if the complete core extension word set is present. Always true for Gforth.
+
+1 -3 mod 0< constant FLOORED ( -- f ) \ environment
+\G True if @code{/} etc. perform floored division
+
+1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment
+\G Largest usable signed integer.
+
+-1 constant MAX-U ( -- u ) \ environment
+\G Largest usable unsigned integer.
+
+-1 MAX-N 2constant MAX-D ( -- d ) \ environment
+\G Largest usable signed double.
+
+-1. 2constant MAX-UD ( -- ud ) \ environment
+\G Largest usable unsigned double.
+
+version-string 2constant gforth ( -- c-addr u ) \ gforth-environment
+\G Counted string representing a version string for this version of
+\G Gforth (for versions>0.3.0).  The version strings of the various
+\G versions are guaranteed to be ordered lexicographically.
+
+: return-stack-cells ( -- n ) \ environment
+    \G Maximum size of the return stack, in cells.
+    [ forthstart 6 cells + ] literal @ cell / ;
+
+: stack-cells ( -- n ) \ environment
+    \G Maximum size of the data stack, in cells.
+    [ forthstart 4 cells + ] literal @ cell / ;
+
+: floating-stack ( -- n ) \ environment
+    \G @var{n} is non-zero, showing that Gforth maintains a separate
+    \G floating-point stack of depth @var{n}.
+    [ forthstart 5 cells + ] literal @
+    [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;
+
+\ !! max-float
+15 constant #locals \ 1000 64 /
+    \ One local can take up to 64 bytes, the size of locals-buffer is 1000
+maxvp constant wordlists
+
+forth definitions
+previous