File:  [gforth] / gforth / environ.fs
Revision 1.13: download - view: text, annotated - select for diffs
Sun Jul 6 14:11:20 1997 UTC (24 years, 1 month ago) by jwilke
Branches: MAIN
CVS tags: HEAD
Small changes.
Jens

    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: 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.
   41: 8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
   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
   47: true constant CORE-EXT
   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
   52: 
   53: -1 MAX-N 2constant MAX-D
   54: -1. 2constant MAX-UD
   55: 
   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
   59: 
   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 )
   67:     [ forthstart 5 cells + ] literal @
   68:     [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;
   69: 
   70: \ !! max-float
   71: 15 constant #locals \ 1000 64 /
   72:     \ One local can take up to 64 bytes, the size of locals-buffer is 1000
   73: maxvp constant wordlists
   74: 
   75: forth definitions
   76: previous
   77: 

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>