[gforth] / gforth / environ.fs  

gforth: gforth/environ.fs

Diff for /gforth/environ.fs between version 1.15 and 1.24

version 1.15, Sat Sep 13 12:04:55 1997 UTC version 1.24, Sat Sep 23 15:05:59 2000 UTC
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 \ environmental queries  \ environmental queries
   
 \ Copyright (C) 1995 Free Software Foundation, Inc.  \ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
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 \ wordlist constant environment-wordlist  \ wordlist constant environment-wordlist
   
 Create environment-wordlist  wordlist drop  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  : 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
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 : e? name environment? 0= ABORT" environmental dependency not existing" ;  : e? name environment? 0= ABORT" environmental dependency not existing" ;
   
 : has? name environment? IF ELSE false THEN ;  : has? name environment? 0= IF false THEN ;
   
 : $has? environment? IF ELSE 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
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 \ 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 ( -- n ) \ environment  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  
 &84 constant /PAD  
 true constant CORE  
 true constant 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  
   
 version-string 2constant gforth \ version string (for versions>0.3.0)  
 \ the version strings of the various versions are guaranteed to be  
 \ sorted lexicographically  
   
 : return-stack-cells ( -- n )  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 / ;      [ forthstart 6 cells + ] literal @ cell / ;
   
 : stack-cells ( -- n )  : stack-cells ( -- n ) \ environment
       \G Maximum size of the data stack, in cells.
     [ forthstart 4 cells + ] literal @ cell / ;      [ forthstart 4 cells + ] literal @ cell / ;
   
 : floating-stack ( -- n )  : 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 @      [ forthstart 5 cells + ] literal @
     [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;      [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;
   

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