version 1.18, 1999/02/03 00:10:19
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version 1.24, 2000/09/23 15:05:59
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\ environmental queries |
\ environmental queries |
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\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ wordlist constant environment-wordlist |
\ wordlist constant environment-wordlist |
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Create environment-wordlist ( -- wid ) \ gforth |
Create environment-wordlist ( -- wid ) \ gforth |
\G wid identifies the word list that is searched by environmental |
\G @i{wid} identifies the word list that is searched by environmental |
\G queries. |
\G queries. |
wordlist drop |
wordlist drop |
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: environment? ( c-addr u -- false / ... true ) \ core environment-query |
: environment? ( c-addr u -- false / ... true ) \ core environment-query |
\G c-addr, u specify the address and length of a string. If the string is |
\G @i{c-addr, u} specify a counted string. If the string is not |
\G not recognised, return a @code{false} flag. Otherwise return a true |
\G recognised, return a @code{false} flag. Otherwise return a |
\G flag and some (string-specific) information about the queried string. |
\G @code{true} flag and some (string-specific) information about |
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\G the queried string. |
environment-wordlist search-wordlist if |
environment-wordlist search-wordlist if |
execute true |
execute true |
else |
else |
Line 49 get-order environment-wordlist swap 1+ s
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Line 50 get-order environment-wordlist swap 1+ s
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\ this should be computed in C as CHAR_BITS/sizeof(char), |
\ this should be computed in C as CHAR_BITS/sizeof(char), |
\ but I don't know any machine with gcc where an au does not have 8 bits. |
\ but I don't know any machine with gcc where an au does not have 8 bits. |
8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment |
8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment |
\G Size of one address unit, it bits. |
\G Size of one address unit, in bits. |
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1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment |
1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment |
\G Maximum value of any character in the character set |
\G Maximum value of any character in the character set |
Line 70 true constant CORE-EXT ( -- f ) \ enviro
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Line 71 true constant CORE-EXT ( -- f ) \ enviro
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\G True if the complete core extension word set is present. Always true for Gforth. |
\G True if the complete core extension word set is present. Always true for Gforth. |
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1 -3 mod 0< constant FLOORED ( -- f ) \ environment |
1 -3 mod 0< constant FLOORED ( -- f ) \ environment |
\G True if division is floored by default. |
\G True if @code{/} etc. perform floored division |
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1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment |
1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment |
\G Largest usable signed integer. |
\G Largest usable signed integer. |
Line 85 true constant CORE-EXT ( -- f ) \ enviro
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Line 86 true constant CORE-EXT ( -- f ) \ enviro
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\G Largest usable unsigned double. |
\G Largest usable unsigned double. |
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version-string 2constant gforth ( -- c-addr u ) \ gforth-environment |
version-string 2constant gforth ( -- c-addr u ) \ gforth-environment |
\G Counted string representing a version string for this version of Gforth |
\G Counted string representing a version string for this version of |
\G (for versions>0.3.0). |
\G Gforth (for versions>0.3.0). The version strings of the various |
\ the version strings of the various versions are guaranteed to be |
\G versions are guaranteed to be ordered lexicographically. |
\ sorted lexicographically |
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: return-stack-cells ( -- n ) \ environment |
: return-stack-cells ( -- n ) \ environment |
\G Maximum size of the return stack, in cells. |
\G Maximum size of the return stack, in cells. |
Line 99 version-string 2constant gforth ( -- c-a
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Line 99 version-string 2constant gforth ( -- c-a
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[ forthstart 4 cells + ] literal @ cell / ; |
[ forthstart 4 cells + ] literal @ cell / ; |
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: floating-stack ( -- n ) \ environment |
: floating-stack ( -- n ) \ environment |
\G n is non-zero, showing that Gforth maintains a separate |
\G @var{n} is non-zero, showing that Gforth maintains a separate |
\G floating-point stack of depth n. |
\G floating-point stack of depth @var{n}. |
[ forthstart 5 cells + ] literal @ |
[ forthstart 5 cells + ] literal @ |
[IFDEF] float float [ELSE] [ 1 floats ] Literal [THEN] / ; |
[IFDEF] float float [ELSE] [ 1 floats ] Literal [THEN] / ; |
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