122 lines
4.4 KiB
Scheme
122 lines
4.4 KiB
Scheme
(define-c-procedure c-calloc libc 'calloc 'pointer '(int int))
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(cond-expand
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(chicken (define c-memset-address->pointer
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(lambda (address value offset)
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(address->pointer address))))
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(else (define-c-procedure c-memset-address->pointer libc 'memset 'pointer '(uint64 uint8 int))))
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(cond-expand
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(chicken (define c-memset-pointer->address
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(lambda (pointer value offset)
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(pointer->address pointer))))
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(else (define-c-procedure c-memset-pointer->address libc 'memset 'uint64 '(pointer uint8 int))))
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;(define-c-procedure c-memset-address libc 'memset 'pointer '(uint64 uint8 int))
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;(define-c-procedure c-printf libc 'printf 'int '(pointer pointer))
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(define-c-procedure c-malloc libc 'malloc 'pointer '(int))
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(define-c-procedure c-strlen libc 'strlen 'int '(pointer))
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(define make-c-bytevector
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(lambda (k . byte)
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(if (null? byte)
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(c-malloc k)
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(bytevector->c-bytevector (make-bytevector k (car byte))))))
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(define c-bytevector
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(lambda bytes
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(bytevector->c-bytevector (apply bytevector bytes))))
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(cond-expand
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(else (define-c-procedure c-free libc 'free 'void '(pointer))))
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(define bytevector->c-bytevector
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(lambda (bytes)
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(letrec* ((bytes-length (bytevector-length bytes))
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(pointer (make-c-bytevector bytes-length))
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(looper (lambda (index)
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(when (< index bytes-length)
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(c-bytevector-u8-set! pointer
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index
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(bytevector-u8-ref bytes index))
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(looper (+ index 1))))))
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(looper 0)
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pointer)))
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(define c-bytevector->bytevector
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(lambda (pointer size)
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(letrec* ((bytes (make-bytevector size))
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(looper (lambda (index)
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(let ((byte (c-bytevector-u8-ref pointer index)))
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(if (= index size)
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bytes
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(begin
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(bytevector-u8-set! bytes index byte)
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(looper (+ index 1))))))))
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(looper 0))))
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(define c-string-length
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(lambda (bytevector-var)
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(c-strlen bytevector-var)))
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(define c-utf8->string
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(lambda (c-bytevector)
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(let ((size (c-strlen c-bytevector)))
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(utf8->string (c-bytevector->bytevector c-bytevector size)))))
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(define string->c-utf8
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(lambda (string-var)
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(bytevector->c-bytevector (string->utf8 (string-append string-var (string #\null))))))
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(cond-expand
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(kawa #t) ; FIXME
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(chicken #t) ; FIXME
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(else (define make-c-null
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(lambda ()
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(cond-expand (stklos (let ((pointer (make-c-bytevector 1)))
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(free-bytes pointer)
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pointer))
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(else (c-memset-address->pointer 0 0 0)))))))
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(cond-expand
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(kawa #t) ; FIXME
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(chicken #t) ; FIXME
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(else (define c-null?
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(lambda (pointer)
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(if (c-bytevector? pointer)
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(= (c-memset-pointer->address pointer 0 0) 0)
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#f)))))
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#;(define c-bytevector->address
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(lambda (c-bytevector)
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(c-memset-pointer->address c-bytevector 0 0)))
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#;(define address->c-bytevector
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(lambda (address)
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(c-memset-address->pointer address 0 0)))
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#;(define c-bytevector-pointer-set!
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(lambda (c-bytevector k pointer)
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(c-bytevector-uint-set! c-bytevector
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0
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(c-bytevector->address pointer)
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(native-endianness)
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(c-type-size 'pointer))))
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#;(define c-bytevector-pointer-ref
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(lambda (c-bytevector k)
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(address->c-bytevector (c-bytevector-uint-ref c-bytevector
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0
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(native-endianness)
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(c-type-size 'pointer)))))
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(cond-expand
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;(kawa #t) ; Defined in kawa.scm
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(else (define-syntax call-with-address-of
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(syntax-rules ()
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((_ input-pointer thunk)
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(let ((address-pointer (make-c-bytevector (c-type-size 'pointer))))
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(c-bytevector-pointer-set! address-pointer 0 input-pointer)
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(let ((result (apply thunk (list address-pointer))))
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(set! input-pointer (c-bytevector-pointer-ref address-pointer 0))
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(c-free address-pointer)
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result)))))))
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