Annotation of gforth/environ.fs, revision 1.21
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
1.20 crook 24: \G @i{wid} identifies the word list that is searched by environmental
1.18 crook 25: \G queries.
26: wordlist drop
1.3 pazsan 27:
1.10 anton 28: : environment? ( c-addr u -- false / ... true ) \ core environment-query
1.20 crook 29: \G @i{c-addr, u} specify a counted string. If the string is not
30: \G recognised, return a @code{false} flag. Otherwise return a
31: \G @code{true} flag and some (string-specific) information about
32: \G the queried string.
1.2 anton 33: environment-wordlist search-wordlist if
34: execute true
35: else
36: false
37: endif ;
38:
1.15 jwilke 39: : e? name environment? 0= ABORT" environmental dependency not existing" ;
1.13 jwilke 40:
1.16 pazsan 41: : has? name environment? 0= IF false THEN ;
1.14 jwilke 42:
1.16 pazsan 43: : $has? environment? 0= IF false THEN ;
1.14 jwilke 44:
1.2 anton 45: environment-wordlist set-current
46: get-order environment-wordlist swap 1+ set-order
47:
48: \ assumes that chars, cells and doubles use an integral number of aus
49:
50: \ this should be computed in C as CHAR_BITS/sizeof(char),
51: \ but I don't know any machine with gcc where an au does not have 8 bits.
1.7 anton 52: 8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
1.19 crook 53: \G Size of one address unit, in bits.
1.2 anton 54:
1.18 crook 55: 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment
56: \G Maximum value of any character in the character set
1.1 anton 57:
1.18 crook 58: MAX-CHAR constant /COUNTED-STRING ( -- n ) \ environment
59: \G Maximum size of a counted string, in characters.
1.3 pazsan 60:
1.18 crook 61: ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD ( -- n ) \ environment
62: \G Size of the pictured numeric string output buffer, in characters.
63:
64: &84 constant /PAD ( -- n ) \ environment
65: \G Size of the scratch area pointed to by @code{PAD}, in characters.
66:
67: true constant CORE ( -- f ) \ environment
68: \G True if the complete core word set is present. Always true for Gforth.
69:
70: true constant CORE-EXT ( -- f ) \ environment
71: \G True if the complete core extension word set is present. Always true for Gforth.
72:
73: 1 -3 mod 0< constant FLOORED ( -- f ) \ environment
1.21 ! anton 74: \G True if @code{/} etc. perform floored division
1.18 crook 75:
76: 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment
77: \G Largest usable signed integer.
78:
79: -1 constant MAX-U ( -- u ) \ environment
80: \G Largest usable unsigned integer.
81:
82: -1 MAX-N 2constant MAX-D ( -- d ) \ environment
83: \G Largest usable signed double.
84:
85: -1. 2constant MAX-UD ( -- ud ) \ environment
86: \G Largest usable unsigned double.
87:
88: version-string 2constant gforth ( -- c-addr u ) \ gforth-environment
89: \G Counted string representing a version string for this version of Gforth
90: \G (for versions>0.3.0).
1.12 anton 91: \ the version strings of the various versions are guaranteed to be
92: \ sorted lexicographically
1.1 anton 93:
1.18 crook 94: : return-stack-cells ( -- n ) \ environment
95: \G Maximum size of the return stack, in cells.
1.10 anton 96: [ forthstart 6 cells + ] literal @ cell / ;
97:
1.18 crook 98: : stack-cells ( -- n ) \ environment
99: \G Maximum size of the data stack, in cells.
1.10 anton 100: [ forthstart 4 cells + ] literal @ cell / ;
101:
1.18 crook 102: : floating-stack ( -- n ) \ environment
1.19 crook 103: \G @var{n} is non-zero, showing that Gforth maintains a separate
104: \G floating-point stack of depth @var{n}.
1.11 pazsan 105: [ forthstart 5 cells + ] literal @
106: [IFDEF] float float [ELSE] [ 1 floats ] Literal [THEN] / ;
1.10 anton 107:
1.5 anton 108: \ !! max-float
1.6 anton 109: 15 constant #locals \ 1000 64 /
110: \ One local can take up to 64 bytes, the size of locals-buffer is 1000
1.5 anton 111: maxvp constant wordlists
1.2 anton 112:
113: forth definitions
114: previous
1.1 anton 115:
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