cffi-posix/cffi-dirent/cffi-dirent.lisp

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• Hash : de782505
  Author : Thomas de Grivel
  Date : 2017-08-01T05:07:37
  

  CFFI bindings for dirent.h

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• cffi-dirent.lisp

• ;;
  ;;  cffi-dirent  -  Common Lisp wrapper for dirent.h
  ;;
  ;;  Copyright 2017 Thomas de Grivel <thoxdg@gmail.com>
  ;;
  ;;  Permission to use, copy, modify, and distribute this software for any
  ;;  purpose with or without fee is hereby granted, provided that the above
  ;;  copyright notice and this permission notice appear in all copies.
  ;;
  ;;  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  ;;  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  ;;  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ;;  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  ;;  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ;;  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  ;;  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  ;;
  
  (in-package :cffi-dirent)
  
  (defcfun ("opendir" c-opendir) :pointer
    (name :string))
  
  (defun opendir (name)
    (let ((dirp (c-opendir name)))
      (if (null-pointer-p dirp)
  	(error-errno "opendir")
  	dirp)))
  
  (defcfun ("fdopendir" c-fdopendir) :pointer
    (fd :int))
  
  (defun fdopendir (fd)
    (let ((dirp (c-fdopendir fd)))
      (if (null-pointer-p dirp)
  	(error-errno "fdopendir")
  	dirp)))
  
  (defcfun ("closedir" c-closedir) :int
    (dirp :pointer))
  
  (defun closedir (dirp)
    (let ((r (c-closedir dirp)))
      (if (< r 0)
  	(error-errno "closedir")
  	r)))
  
  (defmacro with-dir ((var name) &body body)
    (let ((dirp (gensym "DIRP-")))
      `(let ((,dirp (opendir ,name)))
         (unwind-protect (let ((,var ,dirp))
  			 ,@body)
  	 (closedir ,dirp)))))
  
  (defcfun ("readdir" c-readdir) :pointer
    (dirp :pointer))
  
  (defun readdir (dirp)
    (setf errno 0)
    (let ((dirent (c-readdir dirp)))
      (if (null-pointer-p dirent)
  	(if (zerop errno)
  	    nil
  	    (error-errno "readdir"))
  	dirent)))
  
  (defun dirent-ino (dirent)
    (foreign-slot-value dirent '(:struct dirent) 'd-ino))
  
  (defun dirent-off (dirent)
    (foreign-slot-value dirent '(:struct dirent) 'd-off))
  
  (defun dirent-reclen (dirent)
    (foreign-slot-value dirent '(:struct dirent) 'd-reclen))
  
  (defun dirent-type (dirent)
    (foreign-slot-value dirent '(:struct dirent) 'd-type))
  
  (defun dirent-name (dirent)
    (let ((d-name (foreign-slot-value dirent '(:struct dirent) 'd-name)))
      (convert-from-foreign d-name :string)))
  
  (defmacro do-dir ((var name) &body body)
    (let ((dirp (gensym "DIRP-"))
  	(dirent (gensym "DIRENT-")))
      `(with-dir (,dirp ,name)
         (loop
  	  (let ((,dirent (readdir ,dirp)))
  	    (unless ,dirent
  	      (return))
  	    (let ((,var ,dirent))
  	      ,@body))))))
  
  #+test
  (do-dir (df "/")
    (format t "~&~S ~S ~S ~S ~S~%"
  	  (dirent-ino df)
  	  (dirent-off df)
  	  (dirent-reclen df)
  	  (dirent-type df)
  	  (dirent-name df)))
  

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