\ environmental queries \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. \ This file is part of Gforth. \ 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., 675 Mass Ave, Cambridge, MA 02139, USA. \ wordlist constant environment-wordlist Create environment-wordlist wordlist drop : environment? ( c-addr u -- false / ... true ) \ core environment-query environment-wordlist search-wordlist if execute true else false 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 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 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 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 ) [ forthstart 6 cells + ] literal @ cell / ; : stack-cells ( -- n ) [ forthstart 4 cells + ] literal @ cell / ; : floating-stack ( -- 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