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;; Copyright (C) 2002-2004, Yuji Minejima <ggb01164@nifty.ne.jp>
;; ALL RIGHTS RESERVED.
;;
;; $Id: stream.lisp,v 1.7 2004/05/26 07:57:52 yuji Exp $
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; * Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; * Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in
;; the documentation and/or other materials provided with the
;; distribution.
;;
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(defun terpri (&optional output-stream)
(write-char #\Newline output-stream)
nil)
(defun read-line (&optional input-stream eof-error-p eof-value recursive-p)
(let ((str (make-array 160
:element-type 'character
:fill-pointer 0
:adjustable t))
char)
(loop
(setq char (read-char input-stream eof-error-p eof-value recursive-p))
(when (eql char eof-value)
(return (values str t)))
(vector-push-extend char str)
(when (char= char #\Newline)
(return (values str nil))))))
(defun write-string (string &optional output-stream &key (start 0) end)
(unless end (setq end (length string)))
(do ((i start (1+ i)))
((= i end) string)
(write-char (char string i) output-stream)))
(defun write-line (string &optional output-stream &key (start 0) end)
(write-string string output-stream :start start :end end)
(write-char #\Newline output-stream)
string)
(defun read-sequence (sequence stream &key (start 0) end)
(let ((pos start)
(read-element (if (subtypep (stream-element-type stream) 'character)
#'read-char
#'read-byte))
new)
(do-subsequence (element sequence start end nil pos)
(unless (setq new (funcall read-element stream))
(return pos))
(setf element new)
(incf pos))))
(defun write-sequence (sequence stream &key (start 0) end)
(let ((write-element (if (subtypep (stream-element-type stream) 'character)
#'write-char
#'write-byte)))
(do-subsequence (element sequence start end)
(funcall write-element element stream))
sequence))
(defmacro with-open-file ((stream filespec &rest options) &body body)
(let ((abortp (gensym)))
(multiple-value-bind (decls forms) (declarations-and-forms body)
`(let ((,var (open filespec ,@options))
(,abortp t))
,@decls
(unwind-protect
(multiple-value-prog1
(progn ,@forms)
(setq ,abortp nil))
(when ,var
(close ,var :abort ,abortp)))))))
(defmacro with-open-stream ((var stream) &body body)
(let ((abortp (gensym)))
(multiple-value-bind (decls forms) (declarations-and-forms body)
`(let ((,var ,stream)
(,abortp t))
,@decls
(unwind-protect
(multiple-value-prog1
(progn ,@forms)
(setq ,abortp nil))
(when ,var
(close ,var :abort ,abortp)))))))
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