1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
|
;"guile.init" Configuration file for SLIB for GUILE -*-scheme-*-
;;; Author: Aubrey Jaffer
;;;
;;; This code is in the public domain.
(if (not (and (string<=? "1.6" (version)) (string<? (version) "1.7")))
(define-module (ice-9 slib))) ; :no-backtrace
(define slib-module (current-module))
(define base:define define)
(define define
(procedure->memoizing-macro
(lambda (exp env)
(cons (if (= 1 (length env)) 'define-public 'base:define) (cdr exp)))))
;;; Hack to make syncase macros work in the slib module
(if (nested-ref the-root-module '(app modules ice-9 syncase))
(set-object-property! (module-local-variable (current-module) 'define)
'*sc-expander*
'(define)))
;;; (software-type) should be set to the generic operating system type.
;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.
(define software-type
(if (string<? (version) "1.6")
(lambda () 'UNIX)
(lambda () 'unix)))
;;; (scheme-implementation-type) should return the name of the scheme
;;; implementation loading this file.
(define (scheme-implementation-type) 'guile)
;;; (scheme-implementation-home-page) should return a (string) URI
;;; (Uniform Resource Identifier) for this scheme implementation's home
;;; page; or false if there isn't one.
(define (scheme-implementation-home-page)
"http://www.gnu.org/software/guile/guile.html")
;;; (scheme-implementation-version) should return a string describing
;;; the version the scheme implementation loading this file.
(define scheme-implementation-version version)
;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxillary files to your Scheme
;;; implementation reside.
(define implementation-vicinity
(let* ((path (or (%search-load-path "ice-9/q.scm")
(error "Could not find ice-9/q.scm in " %load-path)))
(vic (substring path 0 (- (string-length path) 11))))
(lambda () vic)))
;;; Rob Browning says %site-dir exists since Guile-1.6
;;(define implementation-vicinity %site-dir)
;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.
(define library-vicinity
(let ((library-path
(or
;; Use this getenv if your implementation supports it.
(and (defined? 'getenv) (getenv "SCHEME_LIBRARY_PATH"))
;; Rob Browning sent this; I'm not sure its a good idea.
;; See if we can find slib/guile.init (cf. implementation-vicinity).
(let ((path (%search-load-path "slib/guile.init")))
(and path (substring path 0 (- (string-length path) 10))))
;; Use this path if your scheme does not support GETENV
;; or if SCHEME_LIBRARY_PATH is not set.
"/usr/share/slib/"
(in-vicinity (implementation-vicinity) "slib/"))))
(lambda () library-path)))
;;; (home-vicinity) should return the vicinity of the user's HOME
;;; directory, the directory which typically contains files which
;;; customize a computer environment for a user.
(define (home-vicinity)
(let ((home (and (defined? 'getenv) (getenv "HOME"))))
(and home
(case (software-type)
((unix coherent ms-dos) ;V7 unix has a / on HOME
(if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
home
(string-append home "/")))
(else home)))))
;@
(define (user-vicinity)
(case (software-type)
((vms) "[.]")
(else "")))
;@
(define vicinity:suffix?
(let ((suffi
(case (software-type)
((amiga) '(#\: #\/))
((macos thinkc) '(#\:))
((ms-dos windows atarist os/2) '(#\\ #\/))
((nosve) '(#\: #\.))
((unix coherent plan9) '(#\/))
((vms) '(#\: #\]))
(else
(warn "require.scm" 'unknown 'software-type (software-type))
"/"))))
(lambda (chr) (and (memv chr suffi) #t))))
;@
(define (pathname->vicinity pathname)
(let loop ((i (- (string-length pathname) 1)))
(cond ((negative? i) "")
((vicinity:suffix? (string-ref pathname i))
(substring pathname 0 (+ i 1)))
(else (loop (- i 1))))))
;@
(define (program-vicinity)
(define clp (current-load-port))
(if clp
(pathname->vicinity (port-filename clp))
(slib:error 'program-vicinity " called; use slib:load to load")))
;@
(define sub-vicinity
(case (software-type)
((vms) (lambda
(vic name)
(let ((l (string-length vic)))
(if (or (zero? (string-length vic))
(not (char=? #\] (string-ref vic (- l 1)))))
(string-append vic "[" name "]")
(string-append (substring vic 0 (- l 1))
"." name "]")))))
(else (let ((*vicinity-suffix*
(case (software-type)
((nosve) ".")
((macos thinkc) ":")
((ms-dos windows atarist os/2) "\\")
((unix coherent plan9 amiga) "/"))))
(lambda (vic name)
(string-append vic name *vicinity-suffix*))))))
;@
(define (make-vicinity <pathname>) <pathname>)
;@
(define with-load-pathname
(let ((exchange
(lambda (new)
(let ((old program-vicinity))
(set! program-vicinity new)
old))))
(lambda (path thunk)
(define old #f)
(define vic (pathname->vicinity path))
(dynamic-wind
(lambda () (set! old (exchange (lambda () vic))))
thunk
(lambda () (exchange old))))))
;;@ SLIB:FEATURES is a list of symbols naming the (SLIB) features
;;; initially supported by this implementation.
(define slib:features
(append
'(
source ;can load scheme source files
;(SLIB:LOAD-SOURCE "filename")
;;; compiled ;can load compiled files
;(SLIB:LOAD-COMPILED "filename")
vicinity
srfi-59
;; Scheme report features
;; R5RS-compliant implementations should provide all 9 features.
;;; r5rs ;conforms to
eval ;R5RS two-argument eval
values ;R5RS multiple values
dynamic-wind ;R5RS dynamic-wind
;;; macro ;R5RS high level macros
delay ;has DELAY and FORCE
multiarg-apply ;APPLY can take more than 2 args.
;;; char-ready?
rev4-optional-procedures ;LIST-TAIL, STRING-COPY,
;STRING-FILL!, and VECTOR-FILL!
;; These four features are optional in both R4RS and R5RS
multiarg/and- ;/ and - can take more than 2 args.
;;; rationalize
;;; transcript ;TRANSCRIPT-ON and TRANSCRIPT-OFF
with-file ;has WITH-INPUT-FROM-FILE and
;WITH-OUTPUT-TO-FILE
;;; r4rs ;conforms to
;;; ieee-p1178 ;conforms to
;;; r3rs ;conforms to
rev2-procedures ;SUBSTRING-MOVE-LEFT!,
;SUBSTRING-MOVE-RIGHT!,
;SUBSTRING-FILL!,
;STRING-NULL?, APPEND!, 1+,
;-1+, <?, <=?, =?, >?, >=?
;;; object-hash ;has OBJECT-HASH
hash ;HASH, HASHV, HASHQ
full-continuation ;can return multiple times
;;; ieee-floating-point ;conforms to IEEE Standard 754-1985
;IEEE Standard for Binary
;Floating-Point Arithmetic.
;; Other common features
;;; srfi ;srfi-0, COND-EXPAND finds all srfi-*
;;; sicp ;runs code from Structure and
;Interpretation of Computer
;Programs by Abelson and Sussman.
defmacro ;has Common Lisp DEFMACRO
;;; record ;has user defined data structures
string-port ;has CALL-WITH-INPUT-STRING and
;CALL-WITH-OUTPUT-STRING
line-i/o
;;; sort
;;; pretty-print
;;; object->string
;;; format ;Common-lisp output formatting
;;; trace ;has macros: TRACE and UNTRACE
;;; compiler ;has (COMPILER)
;;; ed ;(ED) is editor
system ;posix (system <string>)
;;; getenv ;posix (getenv <string>)
;;; program-arguments ;returns list of strings (argv)
;;; current-time ;returns time in seconds since 1/1/1970
;; Implementation Specific features
logical
random ;Random numbers
array
array-for-each
)
(if (defined? 'getenv)
'(getenv)
'())
(if (defined? 'current-time)
'(current-time)
'())
(if (defined? 'char-ready?)
'(char-ready?)
'())))
;;@ (FILE-POSITION <port> . <k>)
(define (file-position port . args)
(if (null? args)
(ftell port)
(seek port (car args) SEEK_SET)))
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(file-position)))
;;; (OUTPUT-PORT-WIDTH <port>)
(define (output-port-width . arg) 79)
;;; (OUTPUT-PORT-HEIGHT <port>)
(define (output-port-height . arg) 24)
;;; (CURRENT-ERROR-PORT)
;;(define current-error-port
;; (let ((port (current-output-port)))
;; (lambda () port)))
;; If the program is killed by a signal, /bin/sh normally gives an
;; exit code of 128+signum. If /bin/sh itself is killed by a signal
;; then we do the same 128+signum here.
;;
;; "status:stop-sig" shouldn't arise here, since system shouldn't be
;; calling waitpid with WUNTRACED, but allow for it anyway, just in
;; case.
(define system
(let ((guile-core-system system))
(lambda (str)
(define st (guile-core-system str))
(or (status:exit-val st)
(+ 128 (or (status:term-sig st)
(status:stop-sig st)))))))
;; This has to be done after the definition so that the original
;; binding will still be visible during the definition.
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(system)))
;;; for line-i/o
(use-modules (ice-9 popen))
(define (system->line command . tmp)
(let ((ipip (open-input-pipe command)))
(define line (read-line ipip))
(let ((status (close-pipe ipip)))
(and (or (eqv? 0 (status:exit-val status))
(status:term-sig status)
(status:stop-sig status))
(if (eof-object? line) "" line)))))
;; rdelim was loaded by default in guile 1.6, but not in 1.8
;; load it to get read-line, read-line! and write-line,
;; and re-export them for the benefit of loading this file from (ice-9 slib)
(cond ((string>=? (scheme-implementation-version) "1.8")
(use-modules (ice-9 rdelim))
(re-export read-line)
(re-export read-line!)
(re-export write-line)))
(define delete-file
(let ((guile-core-delete-file delete-file))
(lambda (filename)
(catch 'system-error
(lambda () (guile-core-delete-file filename) #t)
(lambda args #f)))))
;; This has to be done after the definition so that the original
;; binding will still be visible during the definition.
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(delete-file)))
;;; FORCE-OUTPUT flushes any pending output on optional arg output port
;;; use this definition if your system doesn't have such a procedure.
;;(define (force-output . arg) #t)
;;; CALL-WITH-INPUT-STRING and CALL-WITH-OUTPUT-STRING are the string
;;; port versions of CALL-WITH-*PUT-FILE.
(define (make-exchanger obj)
(lambda (rep) (let ((old obj)) (set! obj rep) old)))
(define open-file
(let ((guile-core-open-file open-file))
(lambda (filename modes)
(guile-core-open-file filename
(if (symbol? modes)
(symbol->string modes)
modes)))))
;; This has to be done after the definition so that the original
;; binding will still be visible during the definition.
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(open-file)))
(define (call-with-open-ports . ports)
(define proc (car ports))
(cond ((procedure? proc) (set! ports (cdr ports)))
(else (set! ports (reverse ports))
(set! proc (car ports))
(set! ports (reverse (cdr ports)))))
(let ((ans (apply proc ports)))
(for-each close-port ports)
ans))
(if (not (defined? 'browse-url))
;; Nothing special to do for this, so straight from
;; Template.scm. Maybe "sensible-browser" for a debian
;; system would be worth trying too (and would be good on a
;; tty).
(define (browse-url url)
(define (try cmd end) (zero? (system (string-append cmd url end))))
(or (try "netscape-remote -remote 'openURL(" ")'")
(try "netscape -remote 'openURL(" ")'")
(try "netscape '" "'&")
(try "netscape '" "'"))))
;;; "rationalize" adjunct procedures.
;;(define (find-ratio x e)
;; (let ((rat (rationalize x e)))
;; (list (numerator rat) (denominator rat))))
;;(define (find-ratio-between x y)
;; (find-ratio (/ (+ x y) 2) (/ (- x y) 2)))
;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
;;; be returned by CHAR->INTEGER.
;; In Guile-1.8.0: (string>? (string #\000) (string #\200)) ==> #t
(if (string=? (version) "1.8.0")
(define char-code-limit 128))
;;; MOST-POSITIVE-FIXNUM is used in modular.scm
;;(define most-positive-fixnum #x0FFFFFFF)
;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
(define slib:eval
(if (string<? (scheme-implementation-version) "1.5")
eval
(let ((ie (interaction-environment)))
(lambda (expression)
(eval expression ie)))))
;; slib:eval-load definition moved to "require.scm"
;;; Define SLIB:EXIT to be the implementation procedure to exit or
;;; return if exiting not supported.
(define slib:exit quit)
(cond ((string>=? (scheme-implementation-version) "1.8")
(define (slib:load-helper loader)
(lambda (name)
(save-module-excursion
(lambda ()
(set-current-module slib-module)
(let ((errinfo (catch 'system-error
(lambda () (loader name) #f)
(lambda args args))))
(if (and errinfo
(catch 'system-error
(lambda () (loader (string-append name ".scm")) #f)
(lambda args args)))
(apply throw errinfo)))))))
(define slib:load (slib:load-helper load))
(define slib:load-from-path (slib:load-helper load-from-path))
)
(else
;;Here for backward compatability
(define scheme-file-suffix
(let ((suffix (case (software-type)
((nosve) "_scm")
(else ".scm"))))
(lambda () suffix)))
(define (guile:wrap-case-insensitive proc)
(lambda args
(save-module-excursion
(lambda ()
(set-current-module slib-module)
(let ((old (read-options)))
(dynamic-wind
(lambda () (read-enable 'case-insensitive))
(lambda () (apply proc args))
(lambda () (read-options old))))))))
(define read (guile:wrap-case-insensitive read))
(define slib:load
(let ((load-file (guile:wrap-case-insensitive load)))
(lambda (<pathname>)
(load-file (string-append <pathname> (scheme-file-suffix))))))
))
;;;(SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
;;;suffix all the module files in SLIB have. See feature 'SOURCE.
(define slib:load-source slib:load)
;;; (SLIB:LOAD-COMPILED "foo") should load the file that was produced
;;; by compiling "foo.scm" if this implementation can compile files.
;;; See feature 'COMPILED.
(define slib:load-compiled slib:load)
(define defmacro:eval slib:eval)
(define defmacro:load slib:load)
(define (defmacro:expand* x)
(require 'defmacroexpand) (apply defmacro:expand* x '()))
;@
(define gentemp
(let ((*gensym-counter* -1))
(lambda ()
(set! *gensym-counter* (+ *gensym-counter* 1))
(string->symbol
(string-append "slib:G" (number->string *gensym-counter*))))))
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(gentemp)))
;;; If your implementation provides R4RS macros:
(define macro:eval slib:eval)
(define macro:load slib:load)
(define slib:warn warn)
(define slib:error error)
;;; define these as appropriate for your system.
(define slib:tab #\tab)
(define slib:form-feed #\page)
;;; {Time}
(define difftime -)
(define offset-time +)
;;; Early version of 'logical is built-in
(define (copy-bit index to bool)
(if bool
(logior to (arithmetic-shift 1 index))
(logand to (lognot (arithmetic-shift 1 index)))))
(define (bit-field n start end)
(logand (- (expt 2 (- end start)) 1)
(arithmetic-shift n (- start))))
(define (bitwise-if mask n0 n1)
(logior (logand mask n0)
(logand (lognot mask) n1)))
(define (copy-bit-field to from start end)
(bitwise-if (arithmetic-shift (lognot (ash -1 (- end start))) start)
(arithmetic-shift from start)
to))
(define (rotate-bit-field n count start end)
(define width (- end start))
(set! count (modulo count width))
(let ((mask (lognot (ash -1 width))))
(define azn (logand mask (arithmetic-shift n (- start))))
(logior (arithmetic-shift
(logior (logand mask (arithmetic-shift azn count))
(arithmetic-shift azn (- count width)))
start)
(logand (lognot (ash mask start)) n))))
(define (log2-binary-factors n)
(+ -1 (integer-length (logand n (- n)))))
(define (bit-reverse k n)
(do ((m (if (negative? n) (lognot n) n) (arithmetic-shift m -1))
(k (+ -1 k) (+ -1 k))
(rvs 0 (logior (arithmetic-shift rvs 1) (logand 1 m))))
((negative? k) (if (negative? n) (lognot rvs) rvs))))
(define (reverse-bit-field n start end)
(define width (- end start))
(let ((mask (lognot (ash -1 width))))
(define zn (logand mask (arithmetic-shift n (- start))))
(logior (arithmetic-shift (bit-reverse width zn) start)
(logand (lognot (ash mask start)) n))))
(define (integer->list k . len)
(if (null? len)
(do ((k k (arithmetic-shift k -1))
(lst '() (cons (odd? k) lst)))
((<= k 0) lst))
(do ((idx (+ -1 (car len)) (+ -1 idx))
(k k (arithmetic-shift k -1))
(lst '() (cons (odd? k) lst)))
((negative? idx) lst))))
(define (list->integer bools)
(do ((bs bools (cdr bs))
(acc 0 (+ acc acc (if (car bs) 1 0))))
((null? bs) acc)))
(define (booleans->integer . bools)
(list->integer bools))
;;;; SRFI-60 aliases
(define arithmetic-shift ash)
(define bitwise-ior logior)
(define bitwise-xor logxor)
(define bitwise-and logand)
(define bitwise-not lognot)
;;(define bit-count logcount)
(define bit-set? logbit?)
(define any-bits-set? logtest)
(define first-set-bit log2-binary-factors)
(define bitwise-merge bitwise-if)
;;; array-for-each
(define (array-indexes ra)
(let ((ra0 (apply make-array '#() (array-shape ra))))
(array-index-map! ra0 list)
ra0))
(define (array:copy! dest source)
(array-map! dest identity source))
(define (array-null? array)
(zero? (apply * (map (lambda (bnd) (- 1 (apply - bnd)))
(array-shape array)))))
;; DIMENSIONS->UNIFORM-ARRAY and list->uniform-array in Guile-1.6.4
;; cannot make empty arrays.
(define make-array
(lambda (prot . args)
(if (array-null? prot)
(dimensions->uniform-array args (array-prototype prot))
(dimensions->uniform-array args (array-prototype prot)
(apply array-ref prot
(map car (array-shape prot)))))))
;; This has to be done after the definition so that the original
;; binding will still be visible during the definition.
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(make-array)))
(define create-array make-array)
(define (make-uniform-wrapper prot)
(if (string? prot) (set! prot (string->number prot)))
(if prot
(if (string<? (version) "1.8")
(lambda opt (if (null? opt)
(list->uniform-array 1 prot (list prot))
(list->uniform-array 0 prot opt)))
(lambda opt (if (null? opt)
(list->uniform-array 1 prot (list prot))
(list->uniform-array 0 prot (car opt)))))
vector))
(define ac64 (make-uniform-wrapper "+i"))
(define ac32 ac64)
(define ar64 (make-uniform-wrapper "1/3"))
(define ar32 (make-uniform-wrapper "1."))
(define as64 vector)
(define as32 (make-uniform-wrapper -32))
(define as16 as32)
(define as8 as32)
(define au64 vector)
(define au32 (make-uniform-wrapper 32))
(define au16 au32)
(define au8 au32)
(define at1 (make-uniform-wrapper #t))
;;; New SRFI-58 names
;; flonums
(define A:floC128b ac64)
(define A:floC64b ac64)
(define A:floC32b ac32)
(define A:floC16b ac32)
(define A:floR128b ar64)
(define A:floR64b ar64)
(define A:floR32b ar32)
(define A:floR16b ar32)
;; decimal flonums
(define A:floR128d ar64)
(define A:floR64d ar64)
(define A:floR32d ar32)
;; fixnums
(define A:fixZ64b as64)
(define A:fixZ32b as32)
(define A:fixZ16b as16)
(define A:fixZ8b as8)
(define A:fixN64b au64)
(define A:fixN32b au32)
(define A:fixN16b au16)
(define A:fixN8b au8)
(define A:bool at1)
;;; And case-insensitive versions
;; flonums
(define a:floc128b ac64)
(define a:floc64b ac64)
(define a:floc32b ac32)
(define a:floc16b ac32)
(define a:flor128b ar64)
(define a:flor64b ar64)
(define a:flor32b ar32)
(define a:flor16b ar32)
;; decimal flonums
(define a:flor128d ar64)
(define a:flor64d ar64)
(define a:flor32d ar32)
;; fixnums
(define a:fixz64b as64)
(define a:fixz32b as32)
(define a:fixz16b as16)
(define a:fixz8b as8)
(define a:fixn64b au64)
(define a:fixn32b au32)
(define a:fixn16b au16)
(define a:fixn8b au8)
(define a:bool at1)
;;; {Random numbers}
(define (make-random-state . args)
(let ((seed (if (null? args) *random-state* (car args))))
(cond ((string? seed))
((number? seed) (set! seed (number->string seed)))
(else (let ()
(require 'object->string)
(set! seed (object->limited-string seed 50)))))
(seed->random-state seed)))
(if (not (defined? 'random:chunk))
(define (random:chunk sta) (random 256 sta)))
;;; workaround for Guile 1.6.7 bug
(cond ((or (array? 'guile) (array? '(1 6 7)))
(define array?
(let ((old-array? array?))
(lambda (obj)
(and (old-array? obj)
(not (or (list? obj)
(symbol? obj)
(record? obj)))))))
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(array?)))))
;;; Support for older versions of Scheme. Not enough code for its own file.
;;(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
(define t #t)
(define nil #f)
;;; rev2-procedures
(define <? <)
(define <=? <=)
(define =? =)
(define >? >)
(define >=? >=)
(if (string>=? (scheme-implementation-version) "1.8")
(module-replace! (current-module) '(provide provided?)))
(slib:load (in-vicinity (library-vicinity) "require"))
|