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Annotation of gforth/environ.fs, revision 1.19

1.2       anton       1: \ environmental queries
1.1       anton       2: 
1.17      anton       3: \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
1.8       anton       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: 
1.18      crook      23: Create environment-wordlist ( -- wid ) \ gforth
                     24:   \G wid identifies the word list that is searched by environmental
                     25:   \G queries.
                     26:   wordlist drop
1.3       pazsan     27: 
1.10      anton      28: : environment? ( c-addr u -- false / ... true ) \ core environment-query
1.18      crook      29:     \G c-addr, u specify the address and length of a string. If the string is
                     30:     \G not recognised, return a @code{false} flag. Otherwise return a true
                     31:     \G flag and some (string-specific) information about the queried string.
1.2       anton      32:     environment-wordlist search-wordlist if
                     33:        execute true
                     34:     else
                     35:        false
                     36:     endif ;
                     37: 
1.15      jwilke     38: : e? name environment? 0= ABORT" environmental dependency not existing" ;
1.13      jwilke     39: 
1.16      pazsan     40: : has? name environment? 0= IF false THEN ;
1.14      jwilke     41: 
1.16      pazsan     42: : $has? environment? 0= IF false THEN ;
1.14      jwilke     43: 
1.2       anton      44: environment-wordlist set-current
                     45: get-order environment-wordlist swap 1+ set-order
                     46: 
                     47: \ assumes that chars, cells and doubles use an integral number of aus
                     48: 
                     49: \ this should be computed in C as CHAR_BITS/sizeof(char),
                     50: \ but I don't know any machine with gcc where an au does not have 8 bits.
1.7       anton      51: 8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
1.19    ! crook      52: \G Size of one address unit, in bits.
1.2       anton      53: 
1.18      crook      54: 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment
                     55: \G Maximum value of any character in the character set
1.1       anton      56: 
1.18      crook      57: MAX-CHAR constant /COUNTED-STRING ( -- n ) \ environment
                     58: \G Maximum size of a counted string, in characters.
1.3       pazsan     59: 
1.18      crook      60: ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD ( -- n ) \ environment
                     61: \G Size of the pictured numeric string output buffer, in characters.
                     62: 
                     63: &84 constant /PAD ( -- n ) \ environment
                     64: \G Size of the scratch area pointed to by @code{PAD}, in characters.
                     65: 
                     66: true constant CORE ( -- f ) \ environment
                     67: \G True if the complete core word set is present. Always true for Gforth.
                     68: 
                     69: true constant CORE-EXT ( -- f ) \ environment
                     70: \G True if the complete core extension word set is present. Always true for Gforth.
                     71: 
                     72: 1 -3 mod 0< constant FLOORED ( -- f ) \ environment
                     73: \G True if division is floored by default.
                     74: 
                     75: 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment
                     76: \G Largest usable signed integer.
                     77: 
                     78: -1 constant MAX-U ( -- u ) \ environment
                     79: \G Largest usable unsigned integer.
                     80: 
                     81: -1 MAX-N 2constant MAX-D ( -- d ) \ environment
                     82: \G Largest usable signed double.
                     83: 
                     84: -1. 2constant MAX-UD ( -- ud ) \ environment
                     85: \G Largest usable unsigned double.
                     86: 
                     87: version-string 2constant gforth ( -- c-addr u ) \ gforth-environment
                     88: \G Counted string representing a version string for this version of Gforth
                     89: \G (for versions>0.3.0).
1.12      anton      90: \ the version strings of the various versions are guaranteed to be
                     91: \ sorted lexicographically
1.1       anton      92: 
1.18      crook      93: : return-stack-cells ( -- n ) \ environment
                     94:     \G Maximum size of the return stack, in cells.
1.10      anton      95:     [ forthstart 6 cells + ] literal @ cell / ;
                     96: 
1.18      crook      97: : stack-cells ( -- n ) \ environment
                     98:     \G Maximum size of the data stack, in cells.
1.10      anton      99:     [ forthstart 4 cells + ] literal @ cell / ;
                    100: 
1.18      crook     101: : floating-stack ( -- n ) \ environment
1.19    ! crook     102:     \G @var{n} is non-zero, showing that Gforth maintains a separate
        !           103:     \G floating-point stack of depth @var{n}.
1.11      pazsan    104:     [ forthstart 5 cells + ] literal @
                    105:     [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;
1.10      anton     106: 
1.5       anton     107: \ !! max-float
1.6       anton     108: 15 constant #locals \ 1000 64 /
                    109:     \ One local can take up to 64 bytes, the size of locals-buffer is 1000
1.5       anton     110: maxvp constant wordlists
1.2       anton     111: 
                    112: forth definitions
                    113: previous
1.1       anton     114: