160 lines
7.0 KiB
Scheme
160 lines
7.0 KiB
Scheme
(define size-of-type
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(lambda (type)
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(cond ((eq? type 'int8) (c-sizeof int8_t))
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((eq? type 'uint8) (c-sizeof uint8_t))
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((eq? type 'int16) (c-sizeof int16_t))
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((eq? type 'uint16) (c-sizeof uint16_t))
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((eq? type 'int32) (c-sizeof int32_t))
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((eq? type 'uint32) (c-sizeof uint32_t))
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((eq? type 'int64) (c-sizeof int64_t))
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((eq? type 'uint64) (c-sizeof uint64_t))
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((eq? type 'char) (c-sizeof char))
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((eq? type 'unsigned-char) (c-sizeof char))
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((eq? type 'short) (c-sizeof short))
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((eq? type 'unsigned-short) (c-sizeof unsigned-short))
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((eq? type 'int) (c-sizeof int))
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((eq? type 'unsigned-int) (c-sizeof unsigned-int))
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((eq? type 'long) (c-sizeof long))
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((eq? type 'unsigned-long) (c-sizeof unsigned-long))
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((eq? type 'float) (c-sizeof float))
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((eq? type 'double) (c-sizeof double))
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((eq? type 'pointer) (c-sizeof void*))
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((eq? type 'string) (c-sizeof void*))
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((eq? type 'struct) (c-sizeof void*))
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((eq? type 'callback) (c-sizeof void*))
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((eq? type 'void) 0)
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(else #f))))
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(define c-malloc (c-function void* malloc (size_t)))
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(define c-free (c-function int free (void*)))
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(define pffi-pointer-allocate
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(lambda (size)
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(c-malloc size)))
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(define pffi-pointer-address
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(lambda (pointer)
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pointer))
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(define pffi-pointer?
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(lambda (object)
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(number? object)))
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(define pffi-pointer-free
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(lambda (pointer)
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(c-free pointer)))
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(define pffi-pointer-null
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(lambda ()
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0))
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(define pffi-pointer-null?
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(lambda (pointer)
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(and (pffi-pointer? pointer)
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(= (pffi-pointer-address pointer) 0))))
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(define pffi-pointer->string
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(lambda (pointer)
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(c-string-ref pointer)))
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(define c-memset(c-function int memset (void* int int)))
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(define c-snprintf (c-function int snprintf (void* size_t void*) (long double)))
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(define pffi-string->pointer
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(lambda (string-content)
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(let* ((c-string (make-c-string string-content))
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(c-string-length (bytevector-length c-string))
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(pointer (c-malloc c-string-length)))
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(c-memset pointer 0 c-string-length)
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(c-snprintf pointer c-string-length (make-c-string "%s") c-string)
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pointer)))
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(define pffi-pointer-set!
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(lambda (pointer type offset value)
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(let ((bv (make-bytevector-mapping (+ pointer offset) (pffi-size-of type))))
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(cond ((equal? type 'int8) (bytevector-c-int8-set! bv 0 value))
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((equal? type 'uint8) (bytevector-c-int8-set! bv 0 value))
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((equal? type 'int16) (bytevector-c-int16-set! bv 0 value))
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((equal? type 'uint16) (bytevector-c-int16-set! bv 0 value))
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((equal? type 'int32) (bytevector-c-int32-set! bv 0 value))
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((equal? type 'uint32) (bytevector-c-int32-set! bv 0 value))
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((equal? type 'int64) (bytevector-c-int64-set! bv 0 value))
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((equal? type 'uint64) (bytevector-c-int64-set! bv 0 value))
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((equal? type 'char) (bytevector-c-int8-set! bv 0 (char->integer value)))
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((equal? type 'short) (bytevector-c-short-set! bv 0 value))
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((equal? type 'unsigned-short) (bytevector-c-short-set! bv 0 value))
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((equal? type 'int) (bytevector-c-int-set! bv 0 value))
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((equal? type 'unsigned-int) (bytevector-c-int-set! bv 0 value))
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((equal? type 'long) (bytevector-c-long-set! bv 0 value))
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((equal? type 'unsigned-long) (bytevector-c-long-set! bv 0 value))
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((equal? type 'float) (bytevector-c-float-set! bv 0 value))
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((equal? type 'double) (bytevector-c-double-set! bv 0 value))
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((equal? type 'void) (bytevector-c-void*-set! bv 0 value))
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((equal? type 'pointer) (bytevector-c-void*-set! bv 0 value))))))
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(define pffi-pointer-get
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(lambda (pointer type offset)
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(let ((bv (make-bytevector-mapping (+ pointer offset) (pffi-size-of type))))
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(cond ((equal? type 'int8) (bytevector-c-int8-ref bv 0))
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((equal? type 'uint8) (bytevector-c-uint8-ref bv 0))
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((equal? type 'int16) (bytevector-c-int16-ref bv 0))
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((equal? type 'uint16) (bytevector-c-uint16-ref bv 0))
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((equal? type 'int32) (bytevector-c-int32-ref bv 0))
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((equal? type 'uint32) (bytevector-c-uint32-ref bv 0))
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((equal? type 'int64) (bytevector-c-int64-ref bv 0))
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((equal? type 'uint64) (bytevector-c-uint64-ref bv 0))
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((equal? type 'char) (integer->char (bytevector-c-uint8-ref bv 0)))
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((equal? type 'short) (bytevector-c-short-ref bv 0))
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((equal? type 'unsigned-short) (bytevector-c-unsigned-short-ref bv 0))
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((equal? type 'int) (bytevector-c-int-ref bv 0))
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((equal? type 'unsigned-int) (bytevector-c-unsigned-int-ref bv 0))
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((equal? type 'long) (bytevector-c-long-ref bv 0))
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((equal? type 'unsigned-long) (bytevector-c-unsigned-long-ref bv 0))
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((equal? type 'float) (bytevector-c-float-ref bv 0))
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((equal? type 'double) (bytevector-c-double-ref bv 0))
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((equal? type 'void) (bytevector-c-void*-ref bv 0))
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((equal? type 'pointer) (bytevector-c-void*-ref bv 0))))))
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(define pffi-shared-object-load
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(lambda (headers path . options)
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(load-shared-object path)))
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(define pffi-type->native-type
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(lambda (type)
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(cond ((equal? type '(quote int8)) 'int8_t)
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((equal? type '(quote uint8)) 'uint8_t)
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((equal? type '(quote int16)) 'int16_t)
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((equal? type '(quote uint16)) 'uint16_t)
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((equal? type '(quote int32)) 'int32_t)
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((equal? type '(quote uint32)) 'uint32_t)
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((equal? type '(quote int64)) 'int64_t)
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((equal? type '(quote uint64)) 'uint64_t)
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((equal? type '(quote char)) 'char)
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((equal? type '(quote unsigned-char)) 'char)
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((equal? type '(quote short)) 'short)
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((equal? type '(quote unsigned-short)) 'unsigned-short)
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((equal? type '(quote int)) 'int)
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((equal? type '(quote unsigned-int)) 'unsigned-int)
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((equal? type '(quote long)) 'long)
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((equal? type '(quote unsigned-long)) 'unsigned-long)
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((equal? type '(quote float)) 'float)
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((equal? type '(quote double)) 'double)
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((equal? type '(quote pointer)) 'void*)
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((equal? type '(quote string)) 'void*)
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((equal? type '(quote void)) 'void)
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((equal? type '(quote callback)) 'void*)
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(else (error "pffi-type->native-type -- No such pffi type" type)))))
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(define-macro
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(pffi-define scheme-name shared-object c-name return-type argument-types)
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`(define ,scheme-name
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(c-function ,(pffi-type->native-type return-type)
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,(cadr c-name)
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,(map pffi-type->native-type (cdr argument-types)))))
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(define-macro
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(pffi-define-callback scheme-name return-type argument-types procedure)
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`(define ,scheme-name
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(c-callback ,(pffi-type->native-type return-type)
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,(map pffi-type->native-type (cdr argument-types))
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,procedure)))
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