version 1.26, 2003/01/24 22:03:20
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version 1.34, 2004/06/13 17:04:29
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\ miscelleneous words |
\ miscelleneous words |
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\ Copyright (C) 1996,1997,1998,2000 Free Software Foundation, Inc. |
\ Copyright (C) 1996,1997,1998,2000,2003 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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Line 106 AUser CSP
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Line 106 AUser CSP
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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 |
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\ !! rewrite slurp-file using slurp-fid |
\ !! rewrite slurp-file using slurp-fid |
: slurp-file ( c-addr1 u1 -- c-addr2 u2 ) |
: 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 |
\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" |
Line 118 AUser CSP
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Line 118 AUser CSP
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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 ; |
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: slurp-fid { fid -- addr u } |
: slurp-fid { fid -- addr u } \ gforth |
\G @var{addr u} is the content of the file @var{fid} |
\G @var{addr u} is the content of the file @var{fid} |
0 0 begin ( awhole uwhole ) |
0 0 begin ( awhole uwhole ) |
dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew ) |
dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew ) |
Line 166 AUser CSP
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Line 166 AUser CSP
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\ f.rdp |
\ f.rdp |
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: move-right ( c-addr u1 u2 cfill -- ) |
: push-right ( c-addr u1 u2 cfill -- ) |
\ move string at c-addr u1 right by u2 chars (without exceeding |
\ move string at c-addr u1 right by u2 chars (without exceeding |
\ the original bound); fill the gap with cfill |
\ the original bound); fill the gap with cfill |
>r dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr ) |
>r over min dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr ) |
dup 2swap /string cmove> |
dup 2swap /string cmove> |
r> r> r> fill ; |
r> r> r> fill ; |
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: f>buf-rdp { f: rf c-addr ur nd up -- } \ gforth |
: f>buf-rdp-try { f: rf c-addr ur nd up um1 -- um2 } |
\G Convert @i{rf} into a string at @i{c-addr ur}. The conversion |
\ um1 is the mantissa length to try, um2 is the actual mantissa length |
\G rules and the meanings of @i{ur nd up} are the same as for |
c-addr ur um1 /string '0 fill |
\G @code{f.rdp}. |
rf c-addr um1 represent if { nexp fsign } |
rf c-addr ur represent if { nexp fsign } |
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nd nexp + up >= |
nd nexp + up >= |
ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if |
ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if |
\ fixed-point notation |
\ fixed-point notation |
c-addr ur beforep nexp - dup { befored } '0 move-right |
c-addr ur beforep nexp - dup { befored } '0 push-right |
c-addr beforep 1- befored min dup { beforez } 0 max bl fill |
c-addr beforep 1- befored min dup { beforez } 0 max bl fill |
fsign if |
fsign if |
'- c-addr beforez 1- 0 max + c! |
'- c-addr beforez 1- 0 max + c! |
endif |
endif |
c-addr ur beforep /string 1 '. move-right |
c-addr ur beforep /string 1 '. push-right |
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nexp nd + |
else \ exponential notation |
else \ exponential notation |
c-addr ur 1 /string 1 '. move-right |
c-addr ur 1 /string 1 '. push-right |
fsign if |
fsign if |
c-addr ur 1 '- move-right |
c-addr ur 1 '- push-right |
endif |
endif |
nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen } |
nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen } |
explen 1+ fsign - ur > if \ exponent too large |
ur explen - 1- fsign + { mantlen } |
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mantlen 0< if \ exponent too large |
drop c-addr ur '* fill |
drop c-addr ur '* fill |
else |
else |
c-addr ur + 0 explen negate /string move |
c-addr ur + 0 explen negate /string move |
endif |
endif |
#>> |
#>> mantlen |
endif |
endif |
else \ inf or nan |
else \ inf or nan |
if \ negative |
if \ negative |
c-addr ur 1 '- move-right |
c-addr ur 1 '- push-right |
endif |
endif |
drop |
drop ur |
\ !! align in some way? |
\ !! align in some way? |
endif ; |
endif |
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1 max ur min ; |
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: f>str-rdp ( rf ur +nd up -- c-addr ur ) \ gforth |
: f>buf-rdp ( rf c-addr +nr +nd +np -- ) \ gforth |
\G Convert @i{rf} into a string at @i{c-addr ur}. The conversion |
\G Convert @i{rf} into a string at @i{c-addr nr}. The conversion |
\G rules and the meanings of @i{ur +nd up} are the same as for |
\G rules and the meanings of @i{nr nd np} are the same as for |
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\G @code{f.rdp}. |
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\ first, get the mantissa length, then convert for real. The |
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\ mantissa length is wrong in a few cases because of different |
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\ rounding; In most cases this does not matter, because the |
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\ mantissa is shorter than expected and the final digits are 0; |
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\ but in a few cases the mantissa gets longer. Then it is |
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\ conceivable that you will see a result that is rounded too much. |
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\ However, I have not been able to construct an example where this |
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\ leads to an unexpected result. |
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swap 0 max swap 0 max |
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fdup 2over 2over 2 pick f>buf-rdp-try f>buf-rdp-try drop ; |
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: f>str-rdp ( rf +nr +nd +np -- c-addr nr ) \ gforth |
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\G Convert @i{rf} into a string at @i{c-addr nr}. The conversion |
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\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 @code{f.rdp}. The result in in the pictured numeric output buffer |
\G and will be destroyed by anything destroying that buffer. |
\G and will be destroyed by anything destroying that buffer. |
rot holdptr @ 1- 0 rot negate /string ( rf +nd up c-addr ur ) |
rot holdptr @ 1- 0 rot negate /string ( rf +nd np c-addr nr ) |
over holdbuf u< -&17 and throw |
over holdbuf u< -&17 and throw |
2tuck 2>r f>buf-rdp 2r> ; |
2tuck 2>r f>buf-rdp 2r> ; |
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: f.rdp ( rf ur +nd up -- ) \ gforth |
: f.rdp ( rf +nr +nd +np -- ) \ gforth |
\G Print float @i{rf} formatted. The total width of the output is |
\G Print float @i{rf} formatted. The total width of the output is |
\G @i{nr}, the number of digits after the decimal point is @i{+nd}, |
\G @i{nr}. For fixed-point notation, the number of digits after the |
\G the minimum number of significant digits for fixed-point notation |
\G decimal point is @i{+nd} and the minimum number of significant |
\G is @i{up}. @code{Set-precision} has no effect on @code{f.rdp}. |
\G digits is @i{np}. @code{Set-precision} has no effect on |
\G Fixed-point notation is used if the number of siginicant digits |
\G @code{f.rdp}. Fixed-point notation is used if the number of |
\G would be larger than @i{up} and if the number of digits before the |
\G siginicant digits would be at least @i{np} and if the number of |
\G decimal point would fit. If fixed-point notation is not used, |
\G digits before the decimal point would fit. If fixed-point notation |
\G exponential notation is used, and if that does not fit, asterisks |
\G is not used, exponential notation is used, and if that does not |
\G are printed. We recommend using @i{ur}>=7 to avoid the risk of |
\G fit, asterisks are printed. We recommend using @i{nr}>=7 to avoid |
\G numbers not fitting at all. We recommend @i{ur}>=@i{up}+5 to avoid |
\G the risk of numbers not fitting at all. We recommend |
\G cases where @code{f.rdp} switches to exponential notation because |
\G @i{nr}>=@i{np}+5 to avoid cases where @code{f.rdp} switches to |
\G fixed-point notation would have too few significant digits, yet |
\G exponential notation because fixed-point notation would have too |
\G exponential notation offers fewer significant digits. We recomment |
\G few significant digits, yet exponential notation offers fewer |
\G @i{ur}>=@i{nd}+2, if you want to have fixed-point notation for some |
\G significant digits. We recommend @i{nr}>=@i{nd}+2, if you want to |
\G numbers. Currently, trailing digits are cut off. |
\G have fixed-point notation for some numbers. We recommend |
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\G @i{np}>@i{nr}, if you want to have exponential notation for all |
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\G numbers. |
f>str-rdp type ; |
f>str-rdp type ; |
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0 [if] |
0 [if] |
Line 256 AUser CSP
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Line 275 AUser CSP
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10e f* |
10e f* |
loop ; |
loop ; |
[then] |
[then] |
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: f.s ( -- ) \ gforth f-dot-s |
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\G Display the number of items on the floating-point stack, |
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\G followed by a list of the items; TOS is the right-most item. |
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." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 |
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?DO dup i - 1- floats fp@ + f@ 16 5 11 f.rdp space LOOP drop ; |