cffi-posix/fd-flexi/fd-flexi.lisp

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• Hash : 1ce95fef
  Author : Thomas de Grivel
  Date : 2017-05-28T14:20:36
  

  Input, output, io streams.

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• fd-flexi.lisp

• ;;
  ;;  fd-flexi  -  Unix file descriptor flexi streams for Common Lisp
  ;;
  ;;  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 :fd-flexi)
  
  (defun input-stream (fd &optional (external-format :utf-8))
    (make-flexi-stream (fd-gray:input-stream fd)
  		     :external-format external-format))
  
  (defmacro with-input-stream ((var fd &optional (external-format :utf-8))
  			     &body body)
    (let ((stream (gensym "STREAM-")))
      `(let ((,stream (input-stream ,fd ,external-format)))
         (unwind-protect (let ((,var ,stream))
  			 ,@body)
  	 (close ,stream)))))
  
  (defun output-stream (fd &optional (external-format :utf-8))
    (make-flexi-stream (fd-gray:output-stream fd)
  		     :external-format external-format))
  
  (defmacro with-output-stream ((var fd &optional (external-format :utf-8))
  			      &body body)
    (let ((stream (gensym "STREAM-")))
      `(let ((,stream (output-stream ,fd ,external-format)))
         (unwind-protect (let ((,var ,stream))
  			 ,@body)
  	 (close ,stream)))))
  
  (defun io-stream (fd &optional (external-format :utf-8))
    (make-flexi-stream (fd-gray:io-stream fd)
  		     :external-format external-format))
  
  (defmacro with-io-stream ((var fd &optional (external-format :utf-8))
  			  &body body)
    (let ((stream (gensym "STREAM-")))
      `(let ((,stream (io-stream ,fd ,external-format)))
         (unwind-protect (let ((,var ,stream))
  			 ,@body)
  	 (close ,stream)))))
  

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