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\ environmental queries \ Copyright (C) 1995,1996,1997,1998,2000,2003,2007] cell/ : cell/ 1 cells / ; [THEN] [IFUNDEF] float/ : float/ 1 floats / ; [THEN] \ 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? ; \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] ; 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