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Annotation of gforth/environ.fs, revision 1.8

1.2       anton       1: \ environmental queries
1.1       anton       2: 
1.8     ! anton       3: \ Copyright (C) 1995 Free Software Foundation, Inc.
        !             4: 
        !             5: \ This file is part of Gforth.
        !             6: 
        !             7: \ Gforth is free software; you can redistribute it and/or
        !             8: \ modify it under the terms of the GNU General Public License
        !             9: \ as published by the Free Software Foundation; either version 2
        !            10: \ of the License, or (at your option) any later version.
        !            11: 
        !            12: \ This program is distributed in the hope that it will be useful,
        !            13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: \ GNU General Public License for more details.
        !            16: 
        !            17: \ You should have received a copy of the GNU General Public License
        !            18: \ along with this program; if not, write to the Free Software
        !            19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            20: 
1.3       pazsan     21: \ wordlist constant environment-wordlist
1.1       anton      22: 
1.3       pazsan     23: Create environment-wordlist  wordlist drop
                     24: 
1.2       anton      25: : environment? ( c-addr u -- false / ... true )
                     26:     environment-wordlist search-wordlist if
                     27:        execute true
                     28:     else
                     29:        false
                     30:     endif ;
                     31: 
                     32: environment-wordlist set-current
                     33: get-order environment-wordlist swap 1+ set-order
                     34: 
                     35: \ assumes that chars, cells and doubles use an integral number of aus
                     36: 
                     37: \ this should be computed in C as CHAR_BITS/sizeof(char),
                     38: \ but I don't know any machine with gcc where an au does not have 8 bits.
1.7       anton      39: 8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
1.2       anton      40: 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR
                     41: MAX-CHAR constant /COUNTED-STRING
                     42: ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD
                     43: &84 constant /PAD
                     44: true constant CORE
1.5       anton      45: true constant CORE-EXT?
1.2       anton      46: 1 -3 mod 0< constant FLOORED
                     47: 
                     48: 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N
                     49: -1 constant MAX-U
1.1       anton      50: 
1.2       anton      51: -1 MAX-N 2constant MAX-D
                     52: -1. 2constant MAX-UD
1.3       pazsan     53: 
1.5       anton      54: 0 1 2constant gforth \ minor major version
1.1       anton      55: 
1.2       anton      56: \ !! RETURN-STACK-CELLS
                     57: \ !! STACK-CELLS
1.5       anton      58: \ !! floating-stack
                     59: \ !! max-float
1.6       anton      60: 15 constant #locals \ 1000 64 /
                     61:     \ One local can take up to 64 bytes, the size of locals-buffer is 1000
1.5       anton      62: maxvp constant wordlists
1.2       anton      63: 
                     64: forth definitions
                     65: previous
1.1       anton      66: