| \ miscelleneous words |
\ miscelleneous words |
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| \ Copyright (C) 1996,1997,1998 Free Software Foundation, Inc. |
\ Copyright (C) 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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| \ You should have received a copy of the GNU General Public License |
\ You should have received a copy of the GNU General Public License |
| \ along with this program; if not, write to the Free Software |
\ along with this program; if not, write to the Free Software |
| \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
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require glocals.fs |
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| ' require alias needs ( ... "name" -- ... ) \ gforth |
' require alias needs ( ... "name" -- ... ) \ gforth |
| \G an alias for @code{require}; exists on other systems (e.g., Win32Forth). |
\G An alias for @code{require}; exists on other systems (e.g., Win32Forth). |
| \ needs is an F-PC name. we will probably switch to 'needs' in the future |
\ needs is an F-PC name. we will probably switch to 'needs' in the future |
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| \ a little more compiler security |
\ a little more compiler security |
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| \ DMIN and DMAX |
\ DMIN and DMAX |
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| : dmin ( d1 d2 -- d ) \ double |
: dmin ( d1 d2 -- d ) \ double d-min |
| 2over 2over d> IF 2swap THEN 2drop ; |
2over 2over d> IF 2swap THEN 2drop ; |
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|
| : dmax ( d1 d2 -- d ) \ double |
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: dmax ( d1 d2 -- d ) \ double d-max |
| 2over 2over d< IF 2swap THEN 2drop ; |
2over 2over d< IF 2swap THEN 2drop ; |
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|
| \ shell commands |
\ shell commands |
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|
| 0 Value $? ( -- n ) \ gforth dollar-question |
0 Value $? ( -- n ) \ gforth dollar-question |
| \G VALUE: The exit status returned by the most recently executed |
\G @code{Value} -- the exit status returned by the most recently executed |
| \G @code{system} command. |
\G @code{system} command. |
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|
| : system ( addr u -- ) \ gforth |
: system ( c-addr u -- ) \ gforth |
| \G Pass the string specified by c-addr, u to the host operating system |
\G Pass the string specified by @var{c-addr u} to the host operating system |
| \G for execution in a sub-shell. |
\G for execution in a sub-shell. |
| (system) throw TO $? ; |
(system) throw TO $? ; |
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| \G equivalent to @code{] literal} |
\G equivalent to @code{] literal} |
| ] postpone literal ; |
] postpone literal ; |
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[ifundef] in-dictionary? |
| : in-dictionary? ( x -- f ) |
: in-dictionary? ( x -- f ) |
| forthstart dictionary-end within ; |
forthstart dictionary-end within ; |
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[endif] |
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|
| : in-return-stack? ( addr -- f ) |
: in-return-stack? ( addr -- f ) |
| rp0 @ swap - [ forthstart 6 cells + ]L @ u< ; |
rp0 @ swap - [ forthstart 6 cells + ]L @ u< ; |
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\ const-does> |
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: compile-literals ( w*u u -- ; run-time: -- w*u ) recursive |
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\ compile u literals, starting with the bottommost one |
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?dup-if |
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swap >r 1- compile-literals |
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r> POSTPONE literal |
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endif ; |
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: compile-fliterals ( r*u u -- ; run-time: -- w*u ) recursive |
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\ compile u fliterals, starting with the bottommost one |
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?dup-if |
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{ F: r } 1- compile-fliterals |
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r POSTPONE fliteral |
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endif ; |
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: (const-does>) ( w*uw r*ur uw ur target "name" -- ) |
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\ define a colon definition "name" containing w*uw r*ur as |
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\ literals and a call to target. |
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{ uw ur target } |
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header docol: cfa, \ start colon def without stack junk |
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ur compile-fliterals uw compile-literals |
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target compile, POSTPONE exit reveal ; |
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: const-does> ( run-time: w*uw r*ur uw ur "name" -- ) |
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\G Defines @var{name} and returns.@sp 0 |
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\G @var{name} execution: pushes @var{w*uw r*ur}, then performs the |
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\G code following the @code{const-does>}. |
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here >r 0 POSTPONE literal |
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POSTPONE (const-does>) |
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POSTPONE ; |
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noname : POSTPONE rdrop |
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lastxt r> cell+ ! \ patch the literal |
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; immediate |
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\ !! rewrite slurp-file using slurp-fid |
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: slurp-file ( c-addr1 u1 -- c-addr2 u2 ) |
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\G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents |
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r/o bin open-file throw >r |
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r@ file-size throw abort" file too large" |
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dup allocate throw swap |
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2dup r@ read-file throw over <> abort" could not read whole file" |
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r> close-file throw ; |
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: slurp-fid { fid -- addr u } |
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\G @var{addr u} is the content of the file @var{fid} |
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0 0 begin ( awhole uwhole ) |
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dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew ) |
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rot r@ fid read-file throw ( awhole uwhole uread R: unew ) |
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r> 2dup = |
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while ( awhole uwhole uread unew ) |
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2drop |
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repeat |
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- + dup >r resize throw r> ; |
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\ ]] ... [[ |
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: compile-literal ( n -- ) |
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postpone literal ; |
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: [[ ( -- ) |
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\G switch from postpone state to compile state |
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\ this is only a marker; it is never really interpreted |
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compile-only-error ; immediate |
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: postponer ( c-addr u -- ) |
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2dup find-name dup if ( c-addr u nt ) |
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nip nip name>comp |
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2dup [comp'] [[ d= if |
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2drop ['] compiler is parser |
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else |
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postpone, |
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endif |
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else |
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drop |
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2dup snumber? dup if |
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0> IF |
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swap postpone literal postpone compile-literal |
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THEN |
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postpone Literal postpone compile-literal |
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2drop |
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ELSE |
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drop no.extensions |
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THEN |
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then ; |
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: ]] ( -- ) |
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\ switch into postpone state |
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['] postponer is parser state on ; immediate restrict |
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\ f.rdp |
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: push-right ( c-addr u1 u2 cfill -- ) |
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\ move string at c-addr u1 right by u2 chars (without exceeding |
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\ the original bound); fill the gap with cfill |
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>r over min dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr ) |
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dup 2swap /string cmove> |
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r> r> r> fill ; |
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: f>buf-rdp-try { f: rf c-addr ur nd up um1 -- um2 } |
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\ um1 is the mantissa length to try, um2 is the actual mantissa length |
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c-addr ur um1 /string '0 fill |
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rf c-addr um1 represent if { nexp fsign } |
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nd nexp + up >= |
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ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if |
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\ fixed-point notation |
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c-addr ur beforep nexp - dup { befored } '0 push-right |
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c-addr beforep 1- befored min dup { beforez } 0 max bl fill |
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fsign if |
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'- c-addr beforez 1- 0 max + c! |
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endif |
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c-addr ur beforep /string 1 '. push-right |
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nexp nd + |
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else \ exponential notation |
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c-addr ur 1 /string 1 '. push-right |
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fsign if |
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c-addr ur 1 '- push-right |
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endif |
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nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen } |
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ur explen - 1- fsign + { mantlen } |
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mantlen 0< if \ exponent too large |
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drop c-addr ur '* fill |
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else |
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c-addr ur + 0 explen negate /string move |
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endif |
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#>> mantlen |
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endif |
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else \ inf or nan |
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if \ negative |
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c-addr ur 1 '- push-right |
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endif |
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drop ur |
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\ !! align in some way? |
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endif |
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1 max ur min ; |
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: f>buf-rdp ( rf c-addr +nr +nd +np -- ) \ 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 |
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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 |
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\G @code{f.rdp}. The result in in the pictured numeric output buffer |
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\G and will be destroyed by anything destroying that buffer. |
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rot holdptr @ 1- 0 rot negate /string ( rf +nd np c-addr nr ) |
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over holdbuf u< -&17 and throw |
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2tuck 2>r f>buf-rdp 2r> ; |
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: f.rdp ( rf +nr +nd +np -- ) \ gforth |
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\G Print float @i{rf} formatted. The total width of the output is |
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\G @i{nr}, the number of digits after the decimal point is @i{+nd}, |
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\G the minimum number of significant digits for fixed-point notation |
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\G is @i{np}. @code{Set-precision} has no effect on @code{f.rdp}. |
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\G Fixed-point notation is used if the number of siginicant digits |
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\G would be at least @i{np} and if the number of digits before the |
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\G decimal point would fit. If fixed-point notation is not used, |
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\G exponential notation is used, and if that does not fit, asterisks |
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\G are printed. We recommend using @i{nr}>=7 to avoid the risk of |
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\G numbers not fitting at all. We recommend @i{nr}>=@i{np}+5 to avoid |
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\G cases where @code{f.rdp} switches to exponential notation because |
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\G fixed-point notation would have too few significant digits, yet |
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\G exponential notation offers fewer significant digits. We recommend |
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\G @i{nr}>=@i{nd}+2, if you want to have fixed-point notation for some |
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\G numbers. We recommend @i{np}>@i{nr}, if you want to have |
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\G exponential notation for all numbers. |
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f>str-rdp type ; |
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0 [if] |
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: testx ( rf ur nd up -- ) |
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'| emit f.rdp ; |
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|
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: test ( -- ) |
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-0.123456789123456789e-20 |
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40 0 ?do |
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cr |
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fdup 7 3 1 testx |
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fdup 7 3 4 testx |
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fdup 7 3 0 testx |
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fdup 7 7 1 testx |
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fdup 7 5 1 testx |
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fdup 7 0 2 testx |
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fdup 5 2 1 testx |
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fdup 4 2 1 testx |
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fdup 18 8 5 testx |
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'| emit |
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10e f* |
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loop ; |
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[then] |
