gforth: gforth/environ.fs

*Added:
* configure.bat configures on MS-DOS machines
* io-dos.h provides IO for MS-DOS
* makefile.dos is a GNU make Makefile for MS-DOS
*Changed:
* Merged gray/gforth and gray/gray4, added conditional compilation for
  gray ports (gforth and bigFORTH first)
* added gforth recognising string in environment
* added interpreter support for images (starts now with magic)
* changed make rule for ds2texi, so that it can run with Messy-DOS
* added SAVESYSTEM in dumpimage.fs
* fixed bug in Makefile for big endian systems (->configure)

\ environmental queries

\ wordlist constant environment-wordlist

Create environment-wordlist  wordlist drop

: environment? ( c-addr u -- false / ... true )
    environment-wordlist search-wordlist if
	execute true
    else
	false
    endif ;

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
1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR
MAX-CHAR constant /COUNTED-STRING
ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD
&84 constant /PAD
true constant CORE
\ CORE-EXT?
1 -3 mod 0< constant FLOORED

1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N
-1 constant MAX-U

-1 MAX-N 2constant MAX-D
-1. 2constant MAX-UD

0 0 2constant gforth \ minor mayor version

\ !! RETURN-STACK-CELLS
\ !! STACK-CELLS

forth definitions
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