version 1.1, 1994/02/11 16:30:46
|
version 1.15, 1997/09/13 12:04:55
|
Line 1
|
Line 1
|
\ ENVIRON.FS Answer environmental queries 20may93jaw |
\ environmental queries |
|
|
\ May be cross-compiled |
\ Copyright (C) 1995 Free Software Foundation, Inc. |
|
|
decimal |
\ This file is part of Gforth. |
|
|
AVARIABLE EnvLink 0 EnvLink ! |
\ Gforth is free software; you can redistribute it and/or |
|
\ modify it under the terms of the GNU General Public License |
|
\ as published by the Free Software Foundation; either version 2 |
|
\ of the License, or (at your option) any later version. |
|
|
: (env) |
\ This program is distributed in the hope that it will be useful, |
EnvLink linked |
\ but WITHOUT ANY WARRANTY; without even the implied warranty of |
dup c, here over chars allot swap move align |
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
, ; |
\ GNU General Public License for more details. |
|
|
: (2env) |
\ You should have received a copy of the GNU General Public License |
EnvLink linked |
\ along with this program; if not, write to the Free Software |
dup $80 or |
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
c, here over chars allot swap move align |
|
, , ; |
\ wordlist constant environment-wordlist |
|
|
: env" ( n -- ) |
Create environment-wordlist wordlist drop |
State @ |
|
IF postpone S" postpone (env) |
: environment? ( c-addr u -- false / ... true ) \ core environment-query |
ELSE [char] " parse (env) THEN ; immediate |
environment-wordlist search-wordlist if |
|
execute true |
: 2env" ( d -- ) |
else |
State @ |
false |
IF postpone S" postpone (2env) |
endif ; |
ELSE [char] " parse (2env) THEN ; immediate |
|
|
: e? name environment? 0= ABORT" environmental dependency not existing" ; |
|
|
: environment? EnvLink |
: has? name environment? IF ELSE false THEN ; |
BEGIN @ dup |
|
WHILE dup cell+ count $1f and |
: $has? environment? IF ELSE false THEN ; |
4 pick 4 pick compare 0= |
|
IF nip nip cell+ count dup -rot |
environment-wordlist set-current |
$1f and + aligned |
get-order environment-wordlist swap 1+ set-order |
swap $80 and IF 2@ ELSE @ THEN |
|
EXIT |
\ assumes that chars, cells and doubles use an integral number of aus |
THEN |
|
REPEAT |
\ this should be computed in C as CHAR_BITS/sizeof(char), |
drop 2drop false ; |
\ but I don't know any machine with gcc where an au does not have 8 bits. |
|
8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment |
|
1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR |
|
MAX-CHAR constant /COUNTED-STRING |
|
ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD |
|
&84 constant /PAD |
|
true constant CORE |
|
true constant CORE-EXT |
|
1 -3 mod 0< constant FLOORED |
|
|
|
1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N |
|
-1 constant MAX-U |
|
|
|
-1 MAX-N 2constant MAX-D |
|
-1. 2constant MAX-UD |
|
|
|
version-string 2constant gforth \ version string (for versions>0.3.0) |
|
\ the version strings of the various versions are guaranteed to be |
|
\ sorted lexicographically |
|
|
|
: return-stack-cells ( -- n ) |
|
[ forthstart 6 cells + ] literal @ cell / ; |
|
|
|
: stack-cells ( -- n ) |
|
[ forthstart 4 cells + ] literal @ cell / ; |
|
|
|
: floating-stack ( -- n ) |
|
[ forthstart 5 cells + ] literal @ |
|
[IFDEF] float float [ELSE] [ 1 floats ] Literal [THEN] / ; |
|
|
|
\ !! max-float |
|
15 constant #locals \ 1000 64 / |
|
\ One local can take up to 64 bytes, the size of locals-buffer is 1000 |
|
maxvp constant wordlists |
|
|
|
forth definitions |
|
previous |
|
|