mirror of
https://github.com/edwinb/Idris2-boot.git
synced 2024-11-24 12:54:28 +03:00
232 lines
6.9 KiB
Scheme
232 lines
6.9 KiB
Scheme
(define blodwen-read-args (lambda (desc)
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(case (vector-ref desc 0)
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((0) '())
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((1) (cons (vector-ref desc 2)
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(blodwen-read-args (vector-ref desc 3)))))))
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(define b+ (lambda (x y bits) (remainder (+ x y) (expt 2 bits))))
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(define b- (lambda (x y bits) (remainder (- x y) (expt 2 bits))))
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(define b* (lambda (x y bits) (remainder (* x y) (expt 2 bits))))
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(define b/ (lambda (x y bits) (remainder (floor (/ x y)) (expt 2 bits))))
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(define blodwen-shl (lambda (x y) (ash x y)))
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(define blodwen-shr (lambda (x y) (ash x (- y))))
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(define blodwen-and (lambda (x y) (logand x y)))
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(define blodwen-or (lambda (x y) (logor x y)))
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(define blodwen-xor (lambda (x y) (logxor x y)))
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(define cast-num
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(lambda (x)
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(if (number? x) x 0)))
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(define destroy-prefix
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(lambda (x)
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(if (eqv? (string-ref x 0) #\#) "" x)))
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(define cast-string-int
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(lambda (x)
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(floor (cast-num (string->number (destroy-prefix x))))))
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(define cast-string-double
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(lambda (x)
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(cast-num (string->number (destroy-prefix x)))))
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(define string-cons (lambda (x y) (string-append (string x) y)))
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(define get-tag (lambda (x) (vector-ref x 0)))
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(define string-reverse (lambda (x)
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(list->string (reverse (string->list x)))))
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(define (string-substr off len s)
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(let* ((l (string-length s))
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(b (max 0 off))
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(x (max 0 len))
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(end (min l (+ b x))))
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(substring s b end)))
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(define either-left
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(lambda (x)
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(vector 0 #f #f x)))
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(define either-right
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(lambda (x)
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(vector 1 #f #f x)))
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(define blodwen-error-quit
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(lambda (msg)
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(display msg)
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(newline)
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(exit 1)))
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;; Buffers
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(define (blodwen-new-buffer size)
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(make-bytevector size 0))
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(define (blodwen-buffer-size buf)
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(bytevector-length buf))
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(define (blodwen-buffer-setbyte buf loc val)
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(bytevector-u8-set! buf loc val))
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(define (blodwen-buffer-getbyte buf loc)
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(bytevector-u8-ref buf loc))
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(define (blodwen-buffer-setint buf loc val)
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(bytevector-s64-set! buf loc val (native-endianness)))
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(define (blodwen-buffer-getint buf loc)
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(bytevector-s64-ref buf loc (native-endianness)))
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(define (blodwen-buffer-setdouble buf loc val)
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(bytevector-ieee-double-set! buf loc val (native-endianness)))
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(define (blodwen-buffer-getdouble buf loc)
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(bytevector-ieee-double-ref buf loc (native-endianness)))
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(define (blodwen-stringbytelen str)
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(bytevector-length (string->utf8 str)))
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(define (blodwen-buffer-setstring buf loc val)
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(let* [(strvec (string->utf8 val))
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(len (bytevector-length strvec))]
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(bytevector-copy! strvec 0 buf loc len)))
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(define (blodwen-buffer-getstring buf loc len)
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(let [(newvec (make-bytevector len))]
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(bytevector-copy! buf loc newvec 0 len)
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(utf8->string newvec)))
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(define (blodwen-buffer-copydata buf start len dest loc)
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(bytevector-copy! buf start dest loc len))
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(define (blodwen-readbuffer-bytes h buf loc max)
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(guard (x (#t -1))
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(get-bytevector-n! h buf loc max)))
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(define (blodwen-readbuffer h)
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(guard (x (#t (bytevector)))
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(get-bytevector-all h)))
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(define (blodwen-writebuffer h buf loc max)
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(guard (x (#t -1))
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(put-bytevector h buf loc max)
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max))
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;; Files: Much of the following adapted from idris-chez, thanks to Niklas
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;; Larsson
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;; All the file operations are implemented as primitives which return
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;; Either Int x, where the Int is an error code:
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(define (blodwen-error-code x)
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(cond
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((i/o-read-error? x) 1)
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((i/o-write-error? x) 2)
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((i/o-file-does-not-exist-error? x) 3)
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((i/o-file-protection-error? x) 4)
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(else 255)))
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;; If the file operation raises an error, catch it and return an appropriate
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;; error code
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(define (blodwen-file-op op)
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(guard
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(x ((i/o-error? x) (either-left (blodwen-error-code x))))
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(either-right (op))))
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(define (blodwen-get-n n p)
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(if (port? p) (get-string-n p n) ""))
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(define (blodwen-putstring p s)
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(if (port? p) (put-string p s) void)
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0)
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(define (blodwen-open file mode bin)
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(define tc (if (= bin 1) #f (make-transcoder (utf-8-codec))))
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(define bm (buffer-mode line))
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(case mode
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(("r") (open-file-input-port file (file-options) bm tc))
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(("w") (open-file-output-port file (file-options no-fail) bm tc))
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(("wx") (open-file-output-port file (file-options) bm tc))
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(("a") (open-file-output-port file (file-options no-fail no-truncate) bm tc))
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(("r+") (open-file-input/output-port file (file-options no-create) bm tc))
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(("w+") (open-file-input/output-port file (file-options no-fail) bm tc))
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(("w+x") (open-file-input/output-port file (file-options) bm tc))
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(("a+") (open-file-input/output-port file (file-options no-fail no-truncate) bm tc))
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(else (raise (make-i/o-error)))))
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(define (blodwen-close-port p)
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(when (port? p) (close-port p)))
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(define (blodwen-get-line p)
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(if (and (port? p) (not (port-eof? p)))
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(let ((str (get-line p)))
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(string-append str "\n"))
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""))
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(define (blodwen-file-size p)
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(port-length p))
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(define (blodwen-eof p)
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(if (port-eof? p)
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1
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0))
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;; Directories
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(define (blodwen-current-directory)
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(current-directory))
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(define (blodwen-change-directory dir)
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(if (file-directory? dir)
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(begin (current-directory dir) 1)
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0))
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(define (blodwen-create-directory dir)
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(blodwen-file-op (lambda () (mkdir dir) 0)))
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; Scheme only gives a primitive for reading all the files in a directory,
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; so this is faking the C interface!
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(define (blodwen-open-directory dir)
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(blodwen-file-op (lambda () (box (directory-list dir)))))
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(define (blodwen-close-directory dir) '()) ; no-op, it's not really open
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(define (blodwen-next-dir-entry dir)
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(let [(dlist (unbox dir))]
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(if (null? dlist)
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(either-left 255)
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(begin (set-box! dir (cdr dlist))
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(either-right (car dlist))))))
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;; Threads
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(define blodwen-thread-data (make-thread-parameter #f))
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(define (blodwen-thread p)
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(fork-thread (lambda () (p (vector 0)))))
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(define (blodwen-get-thread-data)
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(blodwen-thread-data))
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(define (blodwen-set-thread-data a)
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(blodwen-thread-data a))
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(define (blodwen-mutex) (make-mutex))
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(define (blodwen-lock m) (mutex-acquire m))
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(define (blodwen-unlock m) (mutex-release m))
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(define (blodwen-thisthread) (get-thread-id))
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(define (blodwen-condition) (make-condition))
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(define (blodwen-condition-wait c m) (condition-wait c m))
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(define (blodwen-condition-wait-timeout c m t) (condition-wait c m t))
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(define (blodwen-condition-signal c) (condition-signal c))
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(define (blodwen-condition-broadcast c) (condition-broadcast c))
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(define (blodwen-sleep s) (sleep (make-time 'time-duration 0 s)))
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(define (blodwen-usleep s)
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(let ((sec (div s 1000000))
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(micro (mod s 1000000)))
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(sleep (make-time 'time-duration (* 1000 micro) sec))))
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(define (blodwen-time) (time-second (current-time)))
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(define (blodwen-args)
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(define (blodwen-build-args args)
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(if (null? args)
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(vector 0 '())
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(vector 1 '() (car args) (blodwen-build-args (cdr args)))))
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(blodwen-build-args (command-line)))
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