Formatting, tweaking indentation
… my Emacs previously used tabs+spaces for Scheme, which is genuinely horrific. >o<
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78
xattr.scm
78
xattr.scm
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@ -23,16 +23,16 @@
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srfi-1 srfi-12)
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(foreign-declare "#include \"xattr_ext.c\"")
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(foreign-declare "#include \"xattr_ext.c\"")
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;; The direct foreign binding for `get_xattr`
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(define get-xattr-foreign
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;; The direct foreign binding for `get_xattr`
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(define get-xattr-foreign
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(foreign-lambda c-string* "get_xattr" c-string c-string (c-pointer int)))
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;; Wrapper around get-xattr-foreign, which throws exceptions and such.
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(define (get-xattr path attr)
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;; Wrapper around get-xattr-foreign, which throws exceptions and such.
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(define (get-xattr path attr)
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(let-location ([error-code int])
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(let ([attr-value (get-xattr-foreign path attr (location error-code))]
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[exception (or (getxattr-exception error-code)
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@ -42,13 +42,13 @@
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attr-value))))
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;; The direct foreign binding for `list_xattr`
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(define list-xattrs-foreign
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;; The direct foreign binding for `list_xattr`
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(define list-xattrs-foreign
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(foreign-lambda (c-pointer char) "list_xattr" c-string (c-pointer ssize_t) (c-pointer int)))
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;; Wrapper around list-xattrs-foreign, which throws exceptions and such.
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(define (list-xattrs path)
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;; Wrapper around list-xattrs-foreign, which throws exceptions and such.
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(define (list-xattrs path)
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(let-location ([error-code int]
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[length ssize_t])
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(let ([list-pointer (list-xattrs-foreign path (location length) (location error-code))]
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@ -60,13 +60,13 @@
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(pointer->delimited-string-list list-pointer length 0)))))
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;; The direct foreign binding for `set_xattr`
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(define set-xattr-foreign
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;; The direct foreign binding for `set_xattr`
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(define set-xattr-foreign
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(foreign-lambda int "set_xattr" c-string c-string c-string (c-pointer int)))
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;; Wrapper around set-xattr-foreign, throwing exceptions and all that jazz
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(define (set-xattr path attr value)
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;; Wrapper around set-xattr-foreign, throwing exceptions and all that jazz
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(define (set-xattr path attr value)
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(let-location ([error-code int])
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(let ([return-code (set-xattr-foreign path attr value (location error-code))]
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[exception (or (setxattr-exception error-code)
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@ -77,13 +77,13 @@
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value))))
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;; The direct foreign binding for `remove_xattr`
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(define remove-xattr-foreign
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;; The direct foreign binding for `remove_xattr`
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(define remove-xattr-foreign
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(foreign-lambda int "remove_xattr" c-string c-string))
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;; Wrapper around remove-xattr-foreign, blah blah
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(define (remove-xattr path attr)
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;; Wrapper around remove-xattr-foreign, blah blah
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(define (remove-xattr path attr)
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(let* ([value (get-xattr path attr)]
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[error-code (remove-xattr-foreign path attr)]
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[exception (or (getxattr-exception error-code)
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@ -93,14 +93,14 @@
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value)))
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;; TODO: These exception functions should be constructed with a macro and a simple
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;; list, like `((c-constant symbol error-message) ("E2BIG" 'e2big "The attribute value was too big."))
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;; Unfortunately, it looks like chicken's macros work a good bit differently from CLs?
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;; orr I'm losing my mind
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;; TODO: These exception functions should be constructed with a macro and a simple
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;; list, like `((c-constant symbol error-message) ("E2BIG" 'e2big "The attribute value was too big."))
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;; Unfortunately, it looks like chicken's macros work a good bit differently from CLs?
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;; orr I'm losing my mind
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;; Return the exception associated with an error-code as per getxattr(2), if it exists
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(define (getxattr-exception error-code)
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;; Return the exception associated with an error-code as per getxattr(2), if it exists
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(define (getxattr-exception error-code)
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(cond
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[(eq? error-code (foreign-value "E2BIG" int))
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(build-exception 'e2big "The attribute value was too big.")]
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@ -112,8 +112,8 @@
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#f]))
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;; Return the exception associated with a setxattr(2) error-code, if it exists.
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(define (setxattr-exception error-code)
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;; Return the exception associated with a setxattr(2) error-code, if it exists.
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(define (setxattr-exception error-code)
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(cond
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[(eq? error-code (foreign-value "EDQUOT" int))
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(build-exception 'edquot "Setting this attribute would violate disk quota.")]
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@ -127,8 +127,8 @@
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#f]))
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;; Return the exception associated with an error-code as per stat(2), if applicable
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(define (stat-exception error-code)
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;; Return the exception associated with an error-code as per stat(2), if applicable
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(define (stat-exception error-code)
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(cond
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[(eq? error-code (foreign-value "EACCES" int))
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(build-exception 'file "Search permission denied for a parent directory.")]
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@ -154,15 +154,15 @@
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#f]))
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;; Creates a generic exception with given symbol and message
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(define (build-exception symbol message)
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;; Creates a generic exception with given symbol and message
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(define (build-exception symbol message)
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(signal (make-property-condition 'exn 'location symbol 'message message)))
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;; Some C functions offer up a string-list that isn't a two-dimensional array, but a
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;; one-dimensional array with given length and strings separated by a given delimeter.
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;; This takes that sort of pointer and gives you a nice list of strings.
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(define (pointer->delimited-string-list pointer length delimiter)
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;; Some C functions offer up a string-list that isn't a two-dimensional array, but a
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;; one-dimensional array with given length and strings separated by a given delimeter.
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;; This takes that sort of pointer and gives you a nice list of strings.
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(define (pointer->delimited-string-list pointer length delimiter)
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(let* ([is-zero (lambda (num) (eq? num 0))]
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[map-to-char (lambda (a) (map integer->char a))]
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[byte-list (drop-right (pointer->integers pointer length) 1)])
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@ -171,8 +171,8 @@
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(split-list is-zero byte-list)))))
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;; Takes a pointer and returns a list of bytes of a given length
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(define (pointer->integers pointer length)
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;; Takes a pointer and returns a list of bytes of a given length
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(define (pointer->integers pointer length)
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(let ([byte (pointer-s8-ref pointer)])
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(if (eq? length 0)
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byte
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@ -180,8 +180,8 @@
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(pointer->integers (pointer+ pointer 1) (- length 1))))))
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;; Split a list into sublists, with items passing `test` being the delimiters
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(define (split-list test list)
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;; Split a list into sublists, with items passing `test` being the delimiters
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(define (split-list test list)
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(let ([before (take-while (compose not test) list)]
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[after (drop-while (compose not test) list)])
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(cond
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@ -190,6 +190,4 @@
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[(null-list? before)
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(split-list test (cdr after))]
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[#t
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(append `(,before) (split-list test (cdr after)))])))
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)
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(append `(,before) (split-list test (cdr after)))]))))
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