Diff for /gforth/kernel/vars.fs between versions 1.13 and 1.17

version 1.13, 1999/03/08 21:36:08 version 1.17, 1999/05/06 21:33:37
Line 26  hex \ everything now hex! Line 26  hex \ everything now hex!
 \ "a true flag ... [is] a single-cell value with all bits set"  \ "a true flag ... [is] a single-cell value with all bits set"
 \ better definition: 0 0= constant true ( no dependence on 2's compl)  \ better definition: 0 0= constant true ( no dependence on 2's compl)
  -1 Constant true ( -- f ) \ core-ext   -1 Constant true ( -- f ) \ core-ext
 \G CONSTANT: f is a cell with all bits set.  \G CONSTANT: @i{f} is a cell with all bits set.
 \ see starts looking for primitives after this word!  \ see starts looking for primitives after this word!
   
   0 Constant false ( -- f ) \ core-ext    0 Constant false ( -- f ) \ core-ext
 \G CONSTANT: f is a cell with all bits clear.  \G CONSTANT: @i{f} is a cell with all bits clear.
   
   [IFUNDEF] cell 
 1 cells Constant cell ( -- u ) \ gforth  1 cells Constant cell ( -- u ) \ gforth
   \G CONSTANT: the number of address units corresponding to 1 cell.
   [THEN]
   
 1 floats Constant float ( -- u ) \ gforth  1 floats Constant float ( -- u ) \ gforth
   \G CONSTANT: the number of address units corresponding to a floating-point number.
   
 20 Constant bl ( -- c-char ) \ core  20 Constant bl ( -- c-char ) \ core
 \G c-char is the character value for a space.  \G @i{c-char} is the character value for a space.
 \ used by docon:, must be constant  \ used by docon:, must be constant
   
 FF Constant /line  FF Constant /line
Line 105  AUser "error            0 "error ! Line 110  AUser "error            0 "error !
  User tibstack          \ saves >tib in execute   User tibstack          \ saves >tib in execute
  User >tib              \ pointer to terminal input buffer   User >tib              \ pointer to terminal input buffer
  User #tib ( -- a-addr ) \ core-ext   User #tib ( -- a-addr ) \ core-ext
  \G USER VARIABLE: a-addr is the address of a cell containing   \G USER VARIABLE: @i{a-addr} is the address of a cell containing
  \G the number of characters in the terminal input buffer.   \G the number of characters in the terminal input buffer.
  \G OBSOLESCENT: @code{source} superceeds the function of this word.   \G OBSOLESCENT: @code{source} superceeds the function of this word.
   
  User >in ( -- a-addr ) \ core   User >in ( -- a-addr ) \ core
  \G USER VARIABLE: a-addr is the address of a cell containing the   \G USER VARIABLE: @i{a-addr} is the address of a cell containing the
  \G char offset from the start of the terminal input buffer to the   \G char offset from the start of the input buffer to the start of the
  \G start of the parse area   \G parse area.
                         0 >in ! \ char number currently processed in tib                          0 >in ! \ char number currently processed in tib
 [THEN]  [THEN]
 has? file [IF]  has? file [IF]
  User blk ( -- a-addr ) \ block   User blk ( -- a-addr ) \ block
  \G USER VARIABLE: a-addr is the address of a cell containing zero   \G USER VARIABLE: @i{a-addr} is the address of a cell containing zero
  \G (in which case the input source is not a block and can be identified   \G (in which case the input source is not a block and can be identified
  \G by @code{source-id}) or the number of the block currently being   \G by @code{source-id}) or the number of the block currently being
  \G interpreted. A Standard program should not alter @code{blk} directly.   \G interpreted. A Standard program should not alter @code{blk} directly.
Line 137  has? file [IF] Line 142  has? file [IF]
 [THEN]  [THEN]
   
  User base ( -- a-addr ) \ core   User base ( -- a-addr ) \ core
  \G USER VARIABLE: a-addr is the address of a cell that stores the   \G USER VARIABLE: @i{a-addr} is the address of a cell that stores the
  \G number base used by default for number conversion during input and output.   \G number base used by default for number conversion during input and output.
                         A base !                          A base !
  User dpl               -1 dpl !   User dpl ( -- a-addr ) \ gforth
    \G USER VARIABLE: @i{a-addr} is the address of a cell that stores the          
    \G position of the decimal point in the most recent numeric conversion.
    \G Initialised to -1. After the conversion of a number containing no
    \G decimal point, @code{@ dpl} is -1. After the conversion of @code{2.} it holds
    \G 0. After the conversion of 234123.9 it contains 1, and so forth.
    -1 dpl !
   
  User state ( -- a-addr ) \ core,tools-ext   User state ( -- a-addr ) \ core,tools-ext
  \G Recommended reading: @cite{@code{State}-smartness--Why it is evil   \G USER VARIABLE: @i{a-addr} is the address of a cell containing the
  \G and how to exorcise it},   \G compilation state flag. 0 => interpreting, -1 => compiling.  A
  \G @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short   \G program shall not directly alter the value of @code{state}. The
  \G version: Don't use @code{state}! @xref{Interpretation and   \G following Standard words alter the value in @code{state}: @code{:}
  \G Compilation Semantics} for an alternative. USER VARIABLE: a-addr   \G (colon) @code{;} (semicolon) @code{abort} @code{quit}
  \G is the address of a cell containing the compilation state flag. 0   \G @code{:noname} @code{[} (left-bracket) @code{]} (right-bracket)
  \G => interpreting, -1 => compiling.  A program shall not directly   \G @code{;code}. Don't use @code{state}! @xref{Interpretation and
  \G alter the value of @code{state}. The following Standard words   \G Compilation Semantics} for an alternative. 
  \G alter the value in @code{state}: @code{:} (colon) @code{;}   \  Recommended reading: @cite{@code{State}-smartness--Why it is evil
  \G (semicolon) @code{abort} @code{quit} @code{:noname} @code{[}   \  and how to exorcise it},
  \G (left-bracket) @code{]} (right-bracket) @code{;code}   \  @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short
                         0 state !   \  version: Don't use @code{state}! 
    0 state !
   
 AUser normal-dp         \ the usual dictionary pointer  AUser normal-dp         \ the usual dictionary pointer
 AUser dpp               normal-dp dpp !  AUser dpp               normal-dp dpp !

Removed from v.1.13  
changed lines
  Added in v.1.17


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