1: \ miscelleneous words
2:
3: \ Copyright (C) 1996,1997,1998,2000,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation, either version 3
10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program. If not, see http://www.gnu.org/licenses/.
19:
20: require glocals.fs
21:
22: ' require alias needs ( ... "name" -- ... ) \ gforth
23: \G An alias for @code{require}; exists on other systems (e.g., Win32Forth).
24: \ needs is an F-PC name. we will probably switch to 'needs' in the future
25:
26: \ a little more compiler security
27:
28: \ currently not used by Gforth, but maybe by add-ons e.g., the 486asm
29: AUser CSP
30:
31: : !CSP ( -- )
32: sp@ csp ! ;
33:
34: : ?CSP ( -- )
35: sp@ csp @ <> -22 and throw ;
36:
37: \ DMIN and DMAX
38:
39: : dmin ( d1 d2 -- d ) \ double d-min
40: 2over 2over d> IF 2swap THEN 2drop ;
41:
42:
43: : dmax ( d1 d2 -- d ) \ double d-max
44: 2over 2over d< IF 2swap THEN 2drop ;
45:
46: \ shell commands
47:
48: 0 Value $? ( -- n ) \ gforth dollar-question
49: \G @code{Value} -- the exit status returned by the most recently executed
50: \G @code{system} command.
51:
52: : system ( c-addr u -- ) \ gforth
53: \G Pass the string specified by @var{c-addr u} to the host operating
54: \G system for execution in a sub-shell. The value of the environment
55: \G variable @code{GFORTHSYSTEMPREFIX} (or its default value) is
56: \G prepended to the string (mainly to support using @code{command.com}
57: \G as shell in Windows instead of whatever shell Cygwin uses by
58: \G default; @pxref{Environment variables}).
59: (system) throw TO $? ;
60:
61: : sh ( "..." -- ) \ gforth
62: \G Parse a string and use @code{system} to pass it to the host
63: \G operating system for execution in a sub-shell.
64: '# parse cr system ;
65:
66: \ stuff
67:
68: : ]L ( compilation: n -- ; run-time: -- n ) \ gforth
69: \G equivalent to @code{] literal}
70: ] postpone literal ;
71:
72: [ifundef] in-dictionary?
73: : in-dictionary? ( x -- f )
74: forthstart dictionary-end within ;
75: [endif]
76:
77: : in-return-stack? ( addr -- f )
78: rp0 @ swap - [ forthstart 6 cells + ]L @ u< ;
79:
80: \ const-does>
81:
82: : compile-literals ( w*u u -- ; run-time: -- w*u ) recursive
83: \ compile u literals, starting with the bottommost one
84: ?dup-if
85: swap >r 1- compile-literals
86: r> POSTPONE literal
87: endif ;
88:
89: : compile-fliterals ( r*u u -- ; run-time: -- w*u ) recursive
90: \ compile u fliterals, starting with the bottommost one
91: ?dup-if
92: { F: r } 1- compile-fliterals
93: r POSTPONE fliteral
94: endif ;
95:
96: : (const-does>) ( w*uw r*ur uw ur target "name" -- )
97: \ define a colon definition "name" containing w*uw r*ur as
98: \ literals and a call to target.
99: { uw ur target }
100: header docol: cfa, \ start colon def without stack junk
101: ur compile-fliterals uw compile-literals
102: target compile, POSTPONE exit reveal ;
103:
104: : const-does> ( run-time: w*uw r*ur uw ur "name" -- ) \ gforth
105: \G Defines @var{name} and returns.
106: \G
107: \G @var{name} execution: pushes @var{w*uw r*ur}, then performs the
108: \G code following the @code{const-does>}.
109: here >r 0 POSTPONE literal
110: POSTPONE (const-does>)
111: POSTPONE ;
112: noname : POSTPONE rdrop
113: latestxt r> cell+ ! \ patch the literal
114: ; immediate
115:
116: \ !! rewrite slurp-file using slurp-fid
117: : slurp-file ( c-addr1 u1 -- c-addr2 u2 ) \ gforth
118: \G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents
119: r/o bin open-file throw >r
120: r@ file-size throw abort" file too large"
121: dup allocate throw swap
122: 2dup r@ read-file throw over <> abort" could not read whole file"
123: r> close-file throw ;
124:
125: : slurp-fid ( fid -- addr u ) \ gforth
126: \G @var{addr u} is the content of the file @var{fid}
127: { fid }
128: 0 0 begin ( awhole uwhole )
129: dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew )
130: rot r@ fid read-file throw ( awhole uwhole uread R: unew )
131: r> 2dup =
132: while ( awhole uwhole uread unew )
133: 2drop
134: repeat
135: - + dup >r resize throw r> ;
136:
137: \ ]] ... [[
138:
139: : compile-literal ( n -- )
140: postpone literal ;
141:
142: : compile-compile-literal ( n -- )
143: compile-literal postpone compile-literal ;
144:
145: : compile-2literal ( n1 n2 -- )
146: postpone 2literal ;
147:
148: : compile-compile-2literal ( n1 n2 -- )
149: compile-2literal postpone compile-2literal ;
150:
151: : [[ ( -- )
152: \G switch from postpone state to compile state
153: \ this is only a marker; it is never really interpreted
154: compile-only-error ; immediate
155:
156: [ifdef] compiler1
157: : postponer1 ( c-addr u -- ... xt )
158: 2dup find-name dup if ( c-addr u nt )
159: nip nip name>comp
160: 2dup [comp'] [[ d= if
161: 2drop ['] compiler1 is parser1 ['] noop
162: else
163: ['] postpone,
164: endif
165: else
166: drop
167: 2dup 2>r snumber? dup if
168: 0> IF
169: ['] compile-compile-2literal
170: ELSE
171: ['] compile-compile-literal
172: THEN
173: 2rdrop
174: ELSE
175: drop 2r> no.extensions
176: THEN
177: then ;
178:
179: : ]] ( -- )
180: \ switch into postpone state
181: ['] postponer1 is parser1 state on ; immediate restrict
182:
183: [then]
184:
185: \ f.rdp
186:
187: : push-right ( c-addr u1 u2 cfill -- )
188: \ move string at c-addr u1 right by u2 chars (without exceeding
189: \ the original bound); fill the gap with cfill
190: >r over min dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr )
191: dup 2swap /string cmove>
192: r> r> r> fill ;
193:
194: : f>buf-rdp-try { f: rf c-addr ur nd up um1 -- um2 }
195: \ um1 is the mantissa length to try, um2 is the actual mantissa length
196: c-addr ur um1 /string '0 fill
197: rf c-addr um1 represent if { nexp fsign }
198: nd nexp + up >=
199: ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if
200: \ fixed-point notation
201: c-addr ur beforep nexp - dup { befored } '0 push-right
202: befored 1+ ur >= if \ <=1 digit left, will be pushed out by '.'
203: rf fabs f2* 0.1e nd s>d d>f f** f> if \ round last digit
204: '1 c-addr befored + 1- c!
205: endif
206: endif
207: c-addr beforep 1- befored min dup { beforez } 0 max bl fill
208: fsign if
209: '- c-addr beforez 1- 0 max + c!
210: endif
211: c-addr ur beforep /string 1 '. push-right
212: nexp nd +
213: else \ exponential notation
214: c-addr ur 1 /string 1 '. push-right
215: fsign if
216: c-addr ur 1 '- push-right
217: endif
218: nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen }
219: ur explen - 1- fsign + { mantlen }
220: mantlen 0< if \ exponent too large
221: drop c-addr ur '* fill
222: else
223: c-addr ur + 0 explen negate /string move
224: endif
225: #>> mantlen
226: endif
227: else \ inf or nan
228: if \ negative
229: c-addr ur 1 '- push-right
230: endif
231: drop ur
232: \ !! align in some way?
233: endif
234: 1 max ur min ;
235:
236: : f>buf-rdp ( rf c-addr +nr +nd +np -- ) \ gforth
237: \G Convert @i{rf} into a string at @i{c-addr nr}. The conversion
238: \G rules and the meanings of @i{nr nd np} are the same as for
239: \G @code{f.rdp}.
240: \ first, get the mantissa length, then convert for real. The
241: \ mantissa length is wrong in a few cases because of different
242: \ rounding; In most cases this does not matter, because the
243: \ mantissa is shorter than expected and the final digits are 0;
244: \ but in a few cases the mantissa gets longer. Then it is
245: \ conceivable that you will see a result that is rounded too much.
246: \ However, I have not been able to construct an example where this
247: \ leads to an unexpected result.
248: swap 0 max swap 0 max
249: fdup 2over 2over 2 pick f>buf-rdp-try f>buf-rdp-try drop ;
250:
251: : f>str-rdp ( rf +nr +nd +np -- c-addr nr ) \ gforth
252: \G Convert @i{rf} into a string at @i{c-addr nr}. The conversion
253: \G rules and the meanings of @i{nr +nd np} are the same as for
254: \G @code{f.rdp}. The result in in the pictured numeric output buffer
255: \G and will be destroyed by anything destroying that buffer.
256: rot holdptr @ 1- 0 rot negate /string ( rf +nd np c-addr nr )
257: over holdbuf u< -&17 and throw
258: 2tuck 2>r f>buf-rdp 2r> ;
259:
260: : f.rdp ( rf +nr +nd +np -- ) \ gforth
261: \G Print float @i{rf} formatted. The total width of the output is
262: \G @i{nr}. For fixed-point notation, the number of digits after the
263: \G decimal point is @i{+nd} and the minimum number of significant
264: \G digits is @i{np}. @code{Set-precision} has no effect on
265: \G @code{f.rdp}. Fixed-point notation is used if the number of
266: \G siginicant digits would be at least @i{np} and if the number of
267: \G digits before the decimal point would fit. If fixed-point notation
268: \G is not used, exponential notation is used, and if that does not
269: \G fit, asterisks are printed. We recommend using @i{nr}>=7 to avoid
270: \G the risk of numbers not fitting at all. We recommend
271: \G @i{nr}>=@i{np}+5 to avoid cases where @code{f.rdp} switches to
272: \G exponential notation because fixed-point notation would have too
273: \G few significant digits, yet exponential notation offers fewer
274: \G significant digits. We recommend @i{nr}>=@i{nd}+2, if you want to
275: \G have fixed-point notation for some numbers. We recommend
276: \G @i{np}>@i{nr}, if you want to have exponential notation for all
277: \G numbers.
278: f>str-rdp type ;
279:
280: 0 [if]
281: : testx ( rf ur nd up -- )
282: '| emit f.rdp ;
283:
284: : test ( -- )
285: -0.123456789123456789e-20
286: 40 0 ?do
287: cr
288: fdup 7 3 1 testx
289: fdup 7 3 4 testx
290: fdup 7 3 0 testx
291: fdup 7 7 1 testx
292: fdup 7 5 1 testx
293: fdup 7 0 2 testx
294: fdup 5 2 1 testx
295: fdup 4 2 1 testx
296: fdup 18 8 5 testx
297: '| emit
298: 10e f*
299: loop ;
300: [then]
301:
302: : f.s ( -- ) \ gforth f-dot-s
303: \G Display the number of items on the floating-point stack, followed
304: \G by a list of the items (but not more than specified by
305: \G @code{maxdepth-.s}; TOS is the right-most item.
306: ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0
307: ?DO dup i - 1- floats fp@ + f@ 16 5 11 f.rdp space LOOP drop ;
308:
309: \ defer stuff
310:
311: [ifundef] defer@ : defer@ >body @ ; [then]
312:
313: :noname ' defer@ ;
314: :noname postpone ['] postpone defer@ ;
315: interpret/compile: action-of ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
316: \G @i{Xt} is the XT that is currently assigned to @i{name}.
317:
318: ' action-of
319: comp' action-of drop
320: interpret/compile: what's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth-obsolete
321: \G Old name of @code{action-of}
322:
323:
324: : typewhite ( addr n -- ) \ gforth
325: \G Like type, but white space is printed instead of the characters.
326: \ bounds u+do
327: 0 max bounds ?do
328: i c@ #tab = if \ check for tab
329: #tab
330: else
331: bl
332: then
333: emit
334: loop ;
335:
336: \ w and l stuff
337:
338: environment-wordlist >order
339:
340: 16 address-unit-bits / 1 max constant /w ( -- u ) \ gforth slash-w
341: \G address units for a 16-bit value
342:
343: 32 address-unit-bits / 1 max constant /l ( -- u ) \ gforth slash-l
344: \G address units for a 32-bit value
345:
346: previous
347:
348: [ifdef] uw@
349: \ Open firmware names
350: ' uw@ alias w@ ( addr -- u )
351: ' ul@ alias l@ ( addr -- u )
352: \ ' sw@ alias <w@ ( addr -- n )
353: [then]
354:
355: \ safe output redirection
356:
357: : outfile-execute ( ... xt file-id -- ... ) \ gforth
358: \G execute @i{xt} with the output of @code{type} etc. redirected to
359: \G @i{file-id}.
360: outfile-id { oldfid } try
361: to outfile-id execute 0
362: restore
363: oldfid to outfile-id
364: endtry
365: throw ;
366:
367: : infile-execute ( ... xt file-id -- ... ) \ gforth
368: \G execute @i{xt} with the input of @code{key} etc. redirected to
369: \G @i{file-id}.
370: infile-id { oldfid } try
371: to infile-id execute 0
372: restore
373: oldfid to infile-id
374: endtry
375: throw ;
376:
377: \ safe BASE wrapper
378:
379: : base-execute ( i*x xt u -- j*x ) \ gforth
380: \G execute @i{xt} with the content of @code{BASE} being @i{u}, and
381: \G restoring the original @code{BASE} afterwards.
382: base @ { oldbase } \ use local, because TRY blocks the return stack
383: try
384: base ! execute 0
385: restore
386: oldbase base !
387: endtry
388: throw ;
389:
390: \ th
391:
392: : th ( addr1 u -- addr2 )
393: cells + ;
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