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Annotation of gforth/environ.fs, revision 1.13

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: 
1.10      anton      25: : environment? ( c-addr u -- false / ... true ) \ core environment-query
1.2       anton      26:     environment-wordlist search-wordlist if
                     27:        execute true
                     28:     else
                     29:        false
                     30:     endif ;
                     31: 
1.13    ! jwilke     32: : e? name environment? ; immediate
        !            33: 
1.2       anton      34: environment-wordlist set-current
                     35: get-order environment-wordlist swap 1+ set-order
                     36: 
                     37: \ assumes that chars, cells and doubles use an integral number of aus
                     38: 
                     39: \ this should be computed in C as CHAR_BITS/sizeof(char),
                     40: \ but I don't know any machine with gcc where an au does not have 8 bits.
1.7       anton      41: 8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
1.2       anton      42: 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR
                     43: MAX-CHAR constant /COUNTED-STRING
                     44: ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD
                     45: &84 constant /PAD
                     46: true constant CORE
1.9       anton      47: true constant CORE-EXT
1.2       anton      48: 1 -3 mod 0< constant FLOORED
                     49: 
                     50: 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N
                     51: -1 constant MAX-U
1.1       anton      52: 
1.2       anton      53: -1 MAX-N 2constant MAX-D
                     54: -1. 2constant MAX-UD
1.3       pazsan     55: 
1.12      anton      56: version-string 2constant gforth \ version string (for versions>0.3.0)
                     57: \ the version strings of the various versions are guaranteed to be
                     58: \ sorted lexicographically
1.1       anton      59: 
1.10      anton      60: : return-stack-cells ( -- n )
                     61:     [ forthstart 6 cells + ] literal @ cell / ;
                     62: 
                     63: : stack-cells ( -- n )
                     64:     [ forthstart 4 cells + ] literal @ cell / ;
                     65: 
                     66: : floating-stack ( -- n )
1.11      pazsan     67:     [ forthstart 5 cells + ] literal @
                     68:     [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;
1.10      anton      69: 
1.5       anton      70: \ !! max-float
1.6       anton      71: 15 constant #locals \ 1000 64 /
                     72:     \ One local can take up to 64 bytes, the size of locals-buffer is 1000
1.5       anton      73: maxvp constant wordlists
1.2       anton      74: 
                     75: forth definitions
                     76: previous
1.1       anton      77: