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;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: io.lisp
;;;; Purpose: Input/Output functions for KMRCL package
;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Apr 2000
;;;;
;;;; $Id: io.lisp 9079 2004-04-18 23:24:49Z kevin $
;;;;
;;;; This file, part of KMRCL, is Copyright (c) 2002-2003 by Kevin M. Rosenberg
;;;;
;;;; KMRCL users are granted the rights to distribute and use this software
;;;; as governed by the terms of the Lisp Lesser GNU Public License
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************
(in-package #:kmrcl)
(defun print-file-contents (file &optional (strm *standard-output*))
"Opens a reads a file. Returns the contents as a single string"
(when (probe-file file)
(let ((eof (cons 'eof nil)))
(with-open-file (in file :direction :input)
(do ((line (read-line in nil eof)
(read-line in nil eof)))
((eq line eof))
(write-string line strm)
(write-char #\newline strm))))))
(defun read-stream-to-string (in)
(with-output-to-string (out)
(let ((eof (gensym)))
(do ((line (read-line in nil eof)
(read-line in nil eof)))
((eq line eof))
(format out "~A~%" line)))))
(defun read-file-to-string (file)
"Opens a reads a file. Returns the contents as a single string"
(with-output-to-string (out)
(with-open-file (in file :direction :input)
(read-stream-to-string in))))
(defun read-stream-to-strings (in)
(let ((lines '())
(eof (gensym)))
(do ((line (read-line in nil eof)
(read-line in nil eof)))
((eq line eof))
(push line lines))
(nreverse lines)))
(defun read-file-to-strings (file)
"Opens a reads a file. Returns the contents as a list of strings"
(with-open-file (in file :direction :input)
(read-stream-to-strings in)))
(defun file-subst (old new file1 file2)
(with-open-file (in file1 :direction :input)
(with-open-file (out file2 :direction :output
:if-exists :supersede)
(stream-subst old new in out))))
(defun print-n-chars (char n stream)
(declare (fixnum n) (optimize (speed 3) (safety 0) (space 0)))
(dotimes (i n)
(declare (fixnum i))
(write-char char stream)))
(defun print-n-strings (str n stream)
(declare (fixnum n) (optimize (speed 3) (safety 0) (space 0)))
(dotimes (i n)
(declare (fixnum i))
(write-string str stream)))
(defun indent-spaces (n &optional (stream *standard-output*))
"Indent n*2 spaces to output stream"
(print-n-chars #\space (+ n n) stream))
(defun indent-html-spaces (n &optional (stream *standard-output*))
"Indent n*2 html spaces to output stream"
(print-n-strings " " (+ n n) stream))
(defun print-list (l &optional (output *standard-output*))
"Print a list to a stream"
(format output "~{~A~%~}" l))
(defun print-rows (rows &optional (ostrm *standard-output*))
"Print a list of list rows to a stream"
(dolist (r rows) (format ostrm "~{~A~^ ~}~%" r)))
;; Buffered stream substitute
(defstruct buf
vec (start -1) (used -1) (new -1) (end -1))
(defun bref (buf n)
(svref (buf-vec buf)
(mod n (length (buf-vec buf)))))
(defun (setf bref) (val buf n)
(setf (svref (buf-vec buf)
(mod n (length (buf-vec buf))))
val))
(defun new-buf (len)
(make-buf :vec (make-array len)))
(defun buf-insert (x b)
(setf (bref b (incf (buf-end b))) x))
(defun buf-pop (b)
(prog1
(bref b (incf (buf-start b)))
(setf (buf-used b) (buf-start b)
(buf-new b) (buf-end b))))
(defun buf-next (b)
(when (< (buf-used b) (buf-new b))
(bref b (incf (buf-used b)))))
(defun buf-reset (b)
(setf (buf-used b) (buf-start b)
(buf-new b) (buf-end b)))
(defun buf-clear (b)
(setf (buf-start b) -1 (buf-used b) -1
(buf-new b) -1 (buf-end b) -1))
(defun buf-flush (b str)
(do ((i (1+ (buf-used b)) (1+ i)))
((> i (buf-end b)))
(princ (bref b i) str)))
(defun stream-subst (old new in out)
(declare (string old new))
(let* ((pos 0)
(len (length old))
(buf (new-buf len))
(from-buf nil))
(declare (fixnum pos len))
(do ((c (read-char in nil :eof)
(or (setf from-buf (buf-next buf))
(read-char in nil :eof))))
((eql c :eof))
(declare (character c))
(cond ((char= c (char old pos))
(incf pos)
(cond ((= pos len) ; 3
(princ new out)
(setf pos 0)
(buf-clear buf))
((not from-buf) ; 2
(buf-insert c buf))))
((zerop pos) ; 1
(princ c out)
(when from-buf
(buf-pop buf)
(buf-reset buf)))
(t ; 4
(unless from-buf
(buf-insert c buf))
(princ (buf-pop buf) out)
(buf-reset buf)
(setf pos 0))))
(buf-flush buf out)))
(declaim (inline write-fixnum))
(defun write-fixnum (n s)
#+allegro (excl::print-fixnum s 10 n)
#-allegro (write-string (write-to-string n) s))
#+openmcl
(defun open-device-stream (path direction)
(let* ((mode (ecase direction
(:input #.(read-from-string "#$O_RDONLY"))
(:output #.(read-from-string "#$O_WRONLY"))
(:io #.(read-from-string "#$O_RDWR"))))
(fd (ccl::fd-open (ccl::native-translated-namestring path) mode)))
(if (< fd 0)
(ccl::signal-file-error fd path)
(ccl::make-fd-stream fd :direction direction))))
(defun null-output-stream ()
#-openmcl
(when (probe-file #p"/dev/null")
(open #p"/dev/null" :direction :output :if-exists :overwrite))
#+openmcl
(when (probe-file #p"/dev/null")
(open-device-stream #p"/dev/null" :output))
)
(defun directory-tree (filename)
"Returns a tree of pathnames for sub-directories of a directory"
(let* ((root (canonicalize-directory-name filename))
(subdirs (loop for path in (directory
(make-pathname :name :wild
:type :wild
:defaults root))
when (probe-directory path)
collect (canonicalize-directory-name path))))
(when (find nil subdirs)
(error "~A" subdirs))
(when (null root)
(error "~A" root))
(if subdirs
(cons root (mapcar #'directory-tree subdirs))
(if (probe-directory root)
(list root)
(error "root not directory ~A" root)))))
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