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+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:          cmucl-compat.lisp
+;;;; Purpose:       Compatiblity library for CMUCL functions
+;;;; Programmer:    Kevin M. Rosenberg
+;;;; Date Started:  Feb 2002
+;;;;
+;;;; This file, part of CLSQL, is Copyright (c) 2002-2010 by Kevin M. Rosenberg
+;;;;
+;;;; CLSQL 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 #:cl-user)
+
+(defpackage #:cmucl-compat
+  (:use #:common-lisp)
+  (:export
+   #:shrink-vector
+   #:make-sequence-of-type
+   #:result-type-or-lose
+   #:required-argument
+   ))
+(in-package #:cmucl-compat)
+
+#+(or cmu scl)
+(defmacro required-argument ()
+  `(ext:required-argument))
+
+#-(or cmu scl)
+(defun required-argument ()
+  (error "~&A required keyword argument was not supplied"))
+
+#+(or cmu scl)
+(defmacro shrink-vector (vec len)
+  `(lisp::shrink-vector ,vec ,len))
+
+#+sbcl
+(defmacro shrink-vector (vec len)
+  `(sb-kernel::shrink-vector ,vec ,len))
+
+#-(or cmu sbcl scl)
+(defmacro shrink-vector (vec len)
+  "Shrinks a vector. Optimized if vector has a fill pointer.
+Needs to be a macro to overwrite value of VEC."
+  (let ((new-vec (gensym)))
+    `(cond
+      ((adjustable-array-p ,vec)
+       (adjust-array ,vec ,len))
+      ((typep ,vec 'simple-array)
+       (let ((,new-vec (make-array ,len :element-type
+                                   (array-element-type ,vec))))
+         (check-type ,len fixnum)
+         (locally (declare (optimize (speed 3) (safety 0) (space 0)) )
+           (dotimes (i ,len)
+             (declare (fixnum i))
+             (setf (aref ,new-vec i) (aref ,vec i))))
+         (setq ,vec ,new-vec)))
+      ((typep ,vec 'vector)
+        (setf (fill-pointer ,vec) ,len)
+        ,vec)
+      (t
+       (error "Unable to shrink vector ~S which is type-of ~S" ,vec (type-of ,vec)))
+       )))
+
+
+#-(or cmu scl)
+(defun make-sequence-of-type (type length)
+  "Returns a sequence of the given TYPE and LENGTH."
+  (make-sequence type length))
+
+#+(or cmu scl)
+(if (fboundp 'lisp::make-sequence-of-type)
+    (defun make-sequence-of-type (type len)
+      (lisp::make-sequence-of-type type len))
+  (defun make-sequence-of-type (type len)
+    (common-lisp::make-sequence-of-type type len)))
+
+#-(or cmu scl)
+(defun result-type-or-lose (type nil-ok)
+  (unless (or type nil-ok)
+    (error "NIL output type invalid for this sequence function"))
+  (case type
+    ((list cons)
+     'list)
+    ((string simple-string base-string simple-base-string)
+     'string)
+    (simple-vector
+     'simple-vector)
+    (vector
+     'vector)
+    (t
+     (error "~S is a bad type specifier for sequence functions." type))
+    ))
+
+#+(or cmu scl)
+(defun result-type-or-lose (type nil-ok)
+  (lisp::result-type-or-lose type nil-ok))