File:  [gforth] / gforth / environ.fs
Revision 1.14: download - view: text, annotated - select for diffs
Sun Aug 31 19:31:28 1997 UTC (24 years, 2 months ago) by jwilke
Branches: MAIN
CVS tags: HEAD
changes from gforth-ec:
updated cross (side-effect: no more warnings :-)
some changed other forth-files
['] can not do forward references any more

    1: \ environmental queries
    2: 
    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: 
   21: \ wordlist constant environment-wordlist
   22: 
   23: Create environment-wordlist  wordlist drop
   24: 
   25: : environment? ( c-addr u -- false / ... true ) \ core environment-query
   26:     environment-wordlist search-wordlist if
   27: 	execute true
   28:     else
   29: 	false
   30:     endif ;
   31: 
   32: : e? name environment? ; immediate
   33: 
   34: : has? name environment? IF ELSE false THEN ;
   35: 
   36: : $has? environment? IF ELSE false THEN ;
   37: 
   38: environment-wordlist set-current
   39: get-order environment-wordlist swap 1+ set-order
   40: 
   41: \ assumes that chars, cells and doubles use an integral number of aus
   42: 
   43: \ this should be computed in C as CHAR_BITS/sizeof(char),
   44: \ but I don't know any machine with gcc where an au does not have 8 bits.
   45: 8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
   46: 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR
   47: MAX-CHAR constant /COUNTED-STRING
   48: ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD
   49: &84 constant /PAD
   50: true constant CORE
   51: true constant CORE-EXT
   52: 1 -3 mod 0< constant FLOORED
   53: 
   54: 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N
   55: -1 constant MAX-U
   56: 
   57: -1 MAX-N 2constant MAX-D
   58: -1. 2constant MAX-UD
   59: 
   60: version-string 2constant gforth \ version string (for versions>0.3.0)
   61: \ the version strings of the various versions are guaranteed to be
   62: \ sorted lexicographically
   63: 
   64: : return-stack-cells ( -- n )
   65:     [ forthstart 6 cells + ] literal @ cell / ;
   66: 
   67: : stack-cells ( -- n )
   68:     [ forthstart 4 cells + ] literal @ cell / ;
   69: 
   70: : floating-stack ( -- n )
   71:     [ forthstart 5 cells + ] literal @
   72:     [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;
   73: 
   74: \ !! max-float
   75: 15 constant #locals \ 1000 64 /
   76:     \ One local can take up to 64 bytes, the size of locals-buffer is 1000
   77: maxvp constant wordlists
   78: 
   79: forth definitions
   80: previous
   81: 

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