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(in-package #:org.shirakumo.file-attributes)
;; Linux 5.7.7 AMD64
#+linux
(cffi:defcstruct (stat :size 144)
(mode :uint32 :offset 24)
(uid :uint32 :offset 28)
(gid :uint32 :offset 32)
(size :uint64 :offset 48)
(atime :uint64 :offset 72)
(mtime :uint64 :offset 88))
;; OS X 10.14
#+darwin
(cffi:defcstruct (stat :size 144)
(mode :uint16 :offset 4)
(uid :uint32 :offset 16)
(gid :uint32 :offset 20)
(atime :uint64 :offset 32)
(mtime :uint64 :offset 48)
(size :uint64 :offset 96))
;; FreeBSD 12.1 AMD64
#+freebsd
(cffi:defcstruct (stat :size 224)
(mode :uint16 :offset 24)
(uid :uint32 :offset 28)
(gid :uint32 :offset 32)
(size :uint64 :offset 112)
(atime :uint64 :offset 48)
(mtime :uint64 :offset 64))
;; OpenBSD 7.1 AMD64
#+openbsd
(cffi:defcstruct (stat :size 128)
(mode :uint32 :offset 0)
(uid :uint32 :offset 20)
(gid :uint32 :offset 24)
(size :uint64 :offset 80)
(atime :uint64 :offset 32)
(mtime :uint64 :offset 48))
(cffi:defcfun (cgstat "stat") :int
(path :string)
(buffer :pointer))
(cffi:defcfun (cxstat "__xstat") :int
(path :string)
(buffer :pointer))
(cffi:defcfun (cutimes "utimes") :int
(path :string)
(times :pointer))
(cffi:defcfun (cchown "chown") :int
(path :string)
(owner :uint32)
(group :uint32))
(cffi:defcfun (cchmod "chmod") :int
(path :string)
(mode :uint32))
(defun unix->universal (unix)
(+ unix (encode-universal-time 0 0 0 1 1 1970 0)))
(defun universal->unix (universal)
(- universal (encode-universal-time 0 0 0 1 1 1970 0)))
(defun cstat (path buffer)
(cond ((cffi:foreign-symbol-pointer "stat")
(cgstat path buffer))
((cffi:foreign-symbol-pointer "__xstat")
(cxstat path buffer))
(T
1)))
(defun stat (path)
(cffi:with-foreign-object (ptr '(:struct stat))
(if (= 0 (cstat (enpath path) ptr))
(cffi:mem-ref ptr '(:struct stat))
(error "Stat failed."))))
(defun utimes (path atime mtime)
(cffi:with-foreign-object (ptr :long 4)
(setf (cffi:mem-aref ptr :long 0) (universal->unix atime))
(setf (cffi:mem-aref ptr :long 2) (universal->unix mtime))
(unless (= 0 (cutimes (enpath path) ptr))
(error "Utimes failed."))))
(defun chown (path uid gid)
(cchown (enpath path) uid gid))
(defun chmod (path mode)
(cchmod (enpath path) mode))
(define-implementation access-time (file)
(unix->universal (getf (stat file) 'atime)))
(define-implementation (setf access-time) (value file)
(utimes file value (modification-time file))
value)
(define-implementation modification-time (file)
(unix->universal (getf (stat file) 'mtime)))
(define-implementation (setf modification-time) (value file)
(utimes file (access-time file) value)
value)
(define-implementation group (file)
(getf (stat file) 'gid))
(define-implementation (setf group) (value file)
(chown file (owner file) value)
value)
(define-implementation owner (file)
(getf (stat file) 'uid))
(define-implementation (setf owner) (value file)
(chown file value (group file))
value)
(define-implementation attributes (file)
(getf (stat file) 'mode))
(define-implementation (setf attributes) (value file)
(chmod file value))
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