Diff for /gforth/environ.fs between versions 1.4 and 1.25

version 1.4, 1994/12/21 14:26:23 version 1.25, 2000/09/23 15:46:52
Line 1 Line 1
 \ environmental queries  \ environmental queries
   
 \ wordlist constant environment-wordlist  \ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
   
   \ This file is part of Gforth.
   
 Create environment-wordlist  wordlist drop  \ 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.
   
   \ 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.
   
 : environment? ( c-addr u -- false / ... true )  \ wordlist constant environment-wordlist
   
   Create environment-wordlist ( -- wid ) \ gforth
     \G @i{wid} identifies the word list that is searched by environmental
     \G queries.
     wordlist drop
   
   : 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      environment-wordlist search-wordlist if
         execute true          execute true
     else      else
         false          false
     endif ;      endif ;
   
   : e? name environment? 0= ABORT" environmental dependency not existing" ;
   
   : has? name environment? 0= IF false THEN ;
   
   : $has? environment? 0= IF false THEN ;
   
 environment-wordlist set-current  environment-wordlist set-current
 get-order environment-wordlist swap 1+ set-order  get-order environment-wordlist swap 1+ set-order
   
Line 18  get-order environment-wordlist swap 1+ s Line 49  get-order environment-wordlist swap 1+ s
   
 \ this should be computed in C as CHAR_BITS/sizeof(char),  \ 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.  \ but I don't know any machine with gcc where an au does not have 8 bits.
 8 constant ADDRESS-UNIT-BITS  8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR  \G Size of one address unit, in bits.
 MAX-CHAR constant /COUNTED-STRING  
 ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD  1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment
 &84 constant /PAD  \G Maximum value of any character in the character set
 true constant CORE  
 \ CORE-EXT?  MAX-CHAR constant /COUNTED-STRING ( -- n ) \ environment
 1 -3 mod 0< constant FLOORED  \G Maximum size of a counted string, in characters.
   
 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N  ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD ( -- n ) \ environment
 -1 constant MAX-U  \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 / ;
   
 -1 MAX-N 2constant MAX-D  : stack-cells ( -- n ) \ environment
 -1. 2constant MAX-UD      \G Maximum size of the data stack, in cells.
       [ forthstart 4 cells + ] literal @ cell / ;
   
 0 1 2constant gforth \ minor mayor version  : 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] / ;
   
 \ !! RETURN-STACK-CELLS  \ !! max-float
 \ !! STACK-CELLS  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  forth definitions
 previous  previous

Removed from v.1.4  
changed lines
  Added in v.1.25


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