Diff for /gforth/stuff.fs between versions 1.19 and 1.55

version 1.19, 2001/01/19 21:07:05 version 1.55, 2007/02/23 22:33:21
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 \ miscelleneous words  \ miscelleneous words
   
 \ Copyright (C) 1996,1997,1998,2000 Free Software Foundation, Inc.  \ Copyright (C) 1996,1997,1998,2000,2003,2004,2005,2006 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
Line 51  AUser CSP Line 51  AUser CSP
 \G @code{system} command.  \G @code{system} command.
   
 : system ( c-addr u -- ) \ gforth  : system ( c-addr u -- ) \ gforth
 \G Pass the string specified by @var{c-addr u} to the host operating system  \G Pass the string specified by @var{c-addr u} to the host operating
 \G for execution in a sub-shell.  \G system for execution in a sub-shell.  The value of the environment
   \G variable @code{GFORTHSYSTEMPREFIX} (or its default value) is
   \G prepended to the string (mainly to support using @code{command.com}
   \G as shell in Windows instead of whatever shell Cygwin uses by
   \G default; @pxref{Environment variables}).
     (system) throw TO $? ;      (system) throw TO $? ;
   
 : sh ( "..." -- ) \ gforth  : sh ( "..." -- ) \ gforth
Line 66  AUser CSP Line 70  AUser CSP
     \G equivalent to @code{] literal}      \G equivalent to @code{] literal}
     ] postpone literal ;      ] postpone literal ;
   
   [ifundef] in-dictionary?
 : in-dictionary? ( x -- f )  : in-dictionary? ( x -- f )
     forthstart dictionary-end within ;      forthstart dictionary-end within ;
   [endif]
   
 : in-return-stack? ( addr -- f )  : in-return-stack? ( addr -- f )
     rp0 @ swap - [ forthstart 6 cells + ]L @ u< ;      rp0 @ swap - [ forthstart 6 cells + ]L @ u< ;
Line 96  AUser CSP Line 102  AUser CSP
     ur compile-fliterals uw compile-literals      ur compile-fliterals uw compile-literals
     target compile, POSTPONE exit reveal ;      target compile, POSTPONE exit reveal ;
   
 : const-does> ( run-time: w*uw r*ur uw ur "name" -- )  : const-does> ( run-time: w*uw r*ur uw ur "name" -- ) \ gforth
     \G Defines @var{name} and returns.@sp 0      \G Defines @var{name} and returns.
       \G  
     \G @var{name} execution: pushes @var{w*uw r*ur}, then performs the      \G @var{name} execution: pushes @var{w*uw r*ur}, then performs the
     \G code following the @code{const-does>}.      \G code following the @code{const-does>}.
     here >r 0 POSTPONE literal      here >r 0 POSTPONE literal
     POSTPONE (const-does>)      POSTPONE (const-does>)
     POSTPONE ;      POSTPONE ;
     noname : POSTPONE rdrop      noname : POSTPONE rdrop
     lastxt r> cell+ ! \ patch the literal      latestxt r> cell+ ! \ patch the literal
 ; immediate  ; immediate
   
 : slurp-file ( c-addr1 u1 -- c-addr2 u2 )  \ !! rewrite slurp-file using slurp-fid
     \ c-addr1 u1 is the filename, c-addr2 u2 is the file's contents  : slurp-file ( c-addr1 u1 -- c-addr2 u2 ) \ gforth
       \G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents
     r/o bin open-file throw >r      r/o bin open-file throw >r
     r@ file-size throw abort" file too large"      r@ file-size throw abort" file too large"
     dup allocate throw swap      dup allocate throw swap
     2dup r@ read-file throw over <> abort" could not read whole file"      2dup r@ read-file throw over <> abort" could not read whole file"
     r> close-file throw ;      r> close-file throw ;
   
   : slurp-fid ( fid -- addr u ) \ gforth
   \G @var{addr u} is the content of the file @var{fid}
       { fid }
       0 0 begin ( awhole uwhole )
           dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew )
           rot r@ fid read-file throw ( awhole uwhole uread R: unew )
           r> 2dup =
       while ( awhole uwhole uread unew )
           2drop
       repeat
       - + dup >r resize throw r> ;
   
   \ ]] ... [[
   
   : compile-literal ( n -- )
       postpone literal ;
   
   : compile-compile-literal ( n -- )
       compile-literal postpone compile-literal ;
   
   : compile-2literal ( n1 n2 -- )
       postpone 2literal ;
   
   : compile-compile-2literal ( n1 n2 -- )
       compile-2literal postpone compile-2literal ;
   
   : [[ ( -- )
   \G switch from postpone state to compile state
       \ this is only a marker; it is never really interpreted
       compile-only-error ; immediate
   
   [ifdef] compiler1
   : postponer1 ( c-addr u -- ... xt )
       2dup find-name dup if ( c-addr u nt )
           nip nip name>comp
           2dup [comp'] [[ d= if
               2drop ['] compiler1 is parser1 ['] noop
           else
               ['] postpone,
           endif
       else
           drop
           2dup 2>r snumber? dup if
               0> IF
                   ['] compile-compile-2literal
               ELSE
                   ['] compile-compile-literal
               THEN
               2rdrop
           ELSE
               drop 2r> no.extensions
           THEN
       then ;
   
   : ]] ( -- )
       \ switch into postpone state
       ['] postponer1 is parser1 state on ; immediate restrict
   
   [then]
   
   \ f.rdp
   
   : push-right ( c-addr u1 u2 cfill -- )
       \ move string at c-addr u1 right by u2 chars (without exceeding
       \ the original bound); fill the gap with cfill
       >r over min dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr )
       dup 2swap /string cmove>
       r> r> r> fill ;
   
   : f>buf-rdp-try { f: rf c-addr ur nd up um1 -- um2 }
       \ um1 is the mantissa length to try, um2 is the actual mantissa length
       c-addr ur um1 /string '0 fill
       rf c-addr um1 represent if { nexp fsign }
           nd nexp + up >=
           ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if
               \ fixed-point notation
               c-addr ur beforep nexp - dup { befored } '0 push-right
               befored 1+ ur >= if \ <=1 digit left, will be pushed out by '.'
                   rf fabs f2* 0.1e nd s>d d>f f** f> if \ round last digit
                       '1 c-addr befored + 1- c!
                   endif
               endif
               c-addr beforep 1- befored min dup { beforez } 0 max bl fill
               fsign if
                   '- c-addr beforez 1- 0 max + c!
               endif
               c-addr ur beforep /string 1 '. push-right
               nexp nd +
           else \ exponential notation
               c-addr ur 1 /string 1 '. push-right
               fsign if
                   c-addr ur 1 '- push-right
               endif
               nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen }
               ur explen - 1- fsign + { mantlen }
               mantlen 0< if \ exponent too large
                   drop c-addr ur '* fill
               else
                   c-addr ur + 0 explen negate /string move
               endif
               #>> mantlen
           endif
       else \ inf or nan
           if \ negative
               c-addr ur 1 '- push-right
           endif
           drop ur
           \ !! align in some way?
       endif
       1 max ur min ;
   
   : f>buf-rdp ( rf c-addr +nr +nd +np -- ) \ gforth
   \G Convert @i{rf} into a string at @i{c-addr nr}.  The conversion
   \G rules and the meanings of @i{nr nd np} are the same as for
   \G @code{f.rdp}.
       \ first, get the mantissa length, then convert for real.  The
       \ mantissa length is wrong in a few cases because of different
       \ rounding; In most cases this does not matter, because the
       \ mantissa is shorter than expected and the final digits are 0;
       \ but in a few cases the mantissa gets longer.  Then it is
       \ conceivable that you will see a result that is rounded too much.
       \ However, I have not been able to construct an example where this
       \ leads to an unexpected result.
       swap 0 max swap 0 max
       fdup 2over 2over 2 pick f>buf-rdp-try f>buf-rdp-try drop ;
   
   : f>str-rdp ( rf +nr +nd +np -- c-addr nr ) \ gforth
   \G Convert @i{rf} into a string at @i{c-addr nr}.  The conversion
   \G rules and the meanings of @i{nr +nd np} are the same as for
   \G @code{f.rdp}.  The result in in the pictured numeric output buffer
   \G and will be destroyed by anything destroying that buffer.
       rot holdptr @ 1- 0 rot negate /string ( rf +nd np c-addr nr )
       over holdbuf u< -&17 and throw
       2tuck 2>r f>buf-rdp 2r> ;
   
   : f.rdp ( rf +nr +nd +np -- ) \ gforth
   \G Print float @i{rf} formatted.  The total width of the output is
   \G @i{nr}.  For fixed-point notation, the number of digits after the
   \G decimal point is @i{+nd} and the minimum number of significant
   \G digits is @i{np}.  @code{Set-precision} has no effect on
   \G @code{f.rdp}.  Fixed-point notation is used if the number of
   \G siginicant digits would be at least @i{np} and if the number of
   \G digits before the decimal point would fit.  If fixed-point notation
   \G is not used, exponential notation is used, and if that does not
   \G fit, asterisks are printed.  We recommend using @i{nr}>=7 to avoid
   \G the risk of numbers not fitting at all.  We recommend
   \G @i{nr}>=@i{np}+5 to avoid cases where @code{f.rdp} switches to
   \G exponential notation because fixed-point notation would have too
   \G few significant digits, yet exponential notation offers fewer
   \G significant digits.  We recommend @i{nr}>=@i{nd}+2, if you want to
   \G have fixed-point notation for some numbers.  We recommend
   \G @i{np}>@i{nr}, if you want to have exponential notation for all
   \G numbers.
       f>str-rdp type ;
   
   0 [if]
   : testx ( rf ur nd up -- )
       '| emit f.rdp ;
   
   : test ( -- )
       -0.123456789123456789e-20
       40 0 ?do
           cr
           fdup 7 3 1 testx
           fdup 7 3 4 testx
           fdup 7 3 0 testx
           fdup 7 7 1 testx
           fdup 7 5 1 testx
           fdup 7 0 2 testx
           fdup 5 2 1 testx
           fdup 4 2 1 testx
           fdup 18 8 5 testx
           '| emit
           10e f*
       loop ;
   [then]
   
   : f.s ( -- ) \ gforth f-dot-s
   \G Display the number of items on the floating-point stack, followed
   \G by a list of the items (but not more than specified by
   \G @code{maxdepth-.s}; TOS is the right-most item.
       ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 
       ?DO  dup i - 1- floats fp@ + f@ 16 5 11 f.rdp space LOOP  drop ; 
   
   \ defer stuff
   
   [ifundef] defer@ : defer@ >body @ ; [then]
   
   :noname    ' defer@ ;
   :noname    postpone ['] postpone defer@ ;
   interpret/compile: action-of ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
   \G @i{Xt} is the XT that is currently assigned to @i{name}.
   
   ' action-of
   comp' action-of drop
   interpret/compile: what's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth-obsolete
   \G Old name of @code{action-of}
   
   
   : typewhite ( addr n -- ) \ gforth
   \G Like type, but white space is printed instead of the characters.
       \ bounds u+do
       0 max bounds ?do
           i c@ #tab = if \ check for tab
               #tab
           else
               bl
           then
           emit
       loop ;
   
   \ w and l stuff
   
   environment-wordlist >order
   
   16 address-unit-bits / 1 max constant /w ( -- u ) \ gforth slash-w
   \G address units for a 16-bit value
       
   32 address-unit-bits / 1 max constant /l ( -- u ) \ gforth slash-l
   \G address units for a 32-bit value
   
   previous
   
   [ifdef] uw@
   \ Open firmware names
   ' uw@ alias w@ ( addr -- u )
   ' ul@ alias l@ ( addr -- u )
   \ ' sw@ alias <w@ ( addr -- n )
   [then]
   
   \ safe output redirection
   
   : outfile-execute ( ... xt file-id -- ... ) \ gforth
       \G execute @i{xt} with the output of @code{type} etc. redirected to
       \G @i{file-id}.
       outfile-id { oldfid } try
           to outfile-id execute 0
       restore
           oldfid to outfile-id
       endtry
       throw ;
   
   : infile-execute ( ... xt file-id -- ... ) \ gforth
       \G execute @i{xt} with the input of @code{key} etc. redirected to
       \G @i{file-id}.
       infile-id { oldfid } try
           to infile-id execute 0
       restore
           oldfid to infile-id
       endtry
       throw ;
   
   \ safe BASE wrapper
   
   : base-execute ( i*x xt u -- j*x ) \ gforth
       \G execute @i{xt} with the content of @code{BASE} being @i{u}, and
       \G restoring the original @code{BASE} afterwards.
       base @ { oldbase } \ use local, because TRY blocks the return stack
       try
           base ! execute 0
       restore
           oldbase base !
       endtry
       throw ;
   

Removed from v.1.19  
changed lines
  Added in v.1.55


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