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[uffi.git] / src / mcl / strings.cl

diff --git a/src/mcl/strings.cl b/src/mcl/strings.cl
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+;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: UFFI -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:          strings.cl
+;;;; Purpose:       UFFI source to handle strings, cstring and foreigns
+;;;; Programmers:   Kevin M. Rosenberg and John DeSoi
+;;;; Date Started:  Feb 2002
+;;;;
+;;;; $Id: strings.cl,v 1.5 2002/08/23 15:28:11 kevin Exp $
+;;;;
+;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg 
+;;;; and John DeSoi
+;;;;
+;;;; UFFI 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.
+;;;; *************************************************************************
+
+(declaim (optimize (debug 3) (speed 3) (safety 1) (compilation-speed 0)))
+(in-package :uffi)
+
+
+(defvar +null-cstring-pointer+ (ccl:%null-ptr))
+
+(defmacro convert-from-cstring (obj)
+  "Converts a string from a c-call. Same as convert-from-foreign-string, except
+that CMU automatically converts strings from c-calls."
+  #+cmu obj
+  #+lispworks 
+  (let ((stored (gensym)))
+    `(let ((,stored ,obj))
+       (if (fli:null-pointer-p ,stored)
+          nil
+        (fli:convert-from-foreign-string ,stored))))
+  #+allegro 
+  (let ((stored (gensym)))
+    `(let ((,stored ,obj))
+       (if (zerop ,stored)
+          nil
+        (values (excl:native-to-string ,stored)))))
+  #+mcl 
+  (let ((stored (gensym)))
+    `(let ((,stored ,obj))
+       (if (ccl:%null-ptr-p ,stored)
+          nil
+        (values (ccl:%get-cstring ,stored)))))
+
+
+  )
+
+(defmacro convert-to-cstring (obj)
+  #+lispworks
+  `(if (null ,obj)
+    +null-cstring-pointer+
+    (fli:convert-to-foreign-string ,obj))
+  #+allegro
+  `(if (null ,obj)
+    0
+    (values (excl:string-to-native ,obj)))
+  #+cmu
+  (declare (ignore obj))
+  #+mcl
+  `(if (null ,obj)
+    +null-cstring-pointer+
+    (let ((ptr (new-ptr (1+ (length ,obj)))))
+      (ccl:%put-cstring ptr ,obj)
+      ptr))
+  )
+
+(defmacro free-cstring (obj)
+  #+lispworks
+  `(unless (fli:null-pointer-p ,obj)
+     (fli:free-foreign-object ,obj))
+  #+allegro
+  `(unless (zerop obj)
+     (ff:free-fobject ,obj))
+  #+cmu
+  (declare (ignore obj))
+  #+mcl
+  `(unless (ccl:%null-ptr-p ,obj)
+     (dispose-ptr ,obj))
+
+  )
+
+;; Either length or null-terminated-p must be non-nil
+(defmacro convert-from-foreign-string (obj &key
+                                          length
+                                          (null-terminated-p t))
+  #+allegro
+  `(if (zerop ,obj)
+       nil
+     (values (excl:native-to-string
+             ,obj 
+             ,@(if length (list :length length) (values))
+             :truncate (not ,null-terminated-p))))
+  #+lispworks
+  `(if (fli:null-pointer-p ,obj)
+       nil
+     (fli:convert-from-foreign-string 
+      ,obj
+      ,@(if length (list :length length) (values))
+      :null-terminated-p ,null-terminated-p
+      :external-format '(:latin-1 :eol-style :lf)))      
+  #+cmu
+  `(cmucl-naturalize-cstring (alien:alien-sap ,obj)
+                             :length ,length
+                             :null-terminated-p ,null-terminated-p)
+  #+mcl
+  (declare (ignore null-terminated-p))
+  #+mcl
+  `(if (ccl:%null-ptr-p ,obj)
+     nil
+     (ccl:%get-cstring ,obj 0 ,@(if length (list length) nil)))
+  )
+
+(defmacro convert-to-foreign-string (obj)
+  #+lispworks
+  `(if (null ,obj)
+       +null-cstring-pointer+
+    (fli:convert-to-foreign-string ,obj))
+  #+allegro
+  `(if (null ,obj)
+       0
+     (values (excl:string-to-native ,obj)))
+  #+cmu
+  (let ((size (gensym))
+       (storage (gensym))
+       (i (gensym)))
+    `(when (stringp ,obj)
+       (let* ((,size (length ,obj))
+             (,storage (alien:make-alien char (1+ ,size))))
+        (setq ,storage (alien:cast ,storage (* char)))
+        (dotimes (,i ,size)
+          (declare (fixnum ,i)
+                   (optimize (speed 3) (safety 0)))
+          (setf (alien:deref ,storage ,i) (char-code (char ,obj ,i))))
+        (setf (alien:deref ,storage ,size) 0)
+        ,storage)))
+  #+mcl
+  `(if (null ,obj)
+    +null-cstring-pointer+
+    (let ((ptr (new-ptr (1+ (length ,obj)))))
+      (ccl:%put-cstring ptr ,obj)
+      ptr))
+  )
+
+
+(defmacro allocate-foreign-string (size &key (unsigned t))
+  #+cmu
+  (let ((array-def (gensym)))
+    `(let ((,array-def (list 'alien:array 'c-call:char ,size)))
+       (eval `(alien:cast (alien:make-alien ,,array-def) 
+                         ,(if ,unsigned 
+                              '(* (alien:unsigned 8))
+                            '(* (alien:signed 8)))))))
+  #+lispworks
+  `(fli:allocate-foreign-object :type 
+                               ,(if unsigned 
+                                    ''(:unsigned :char) 
+                                  :char)
+                               :nelems ,size)
+  #+allegro
+  (declare (ignore unsigned))
+  #+allegro
+  `(ff:allocate-fobject :char :c ,size)
+  #+mcl
+  (declare (ignore unsigned))
+  #+mcl
+  `(new-ptr ,size)
+ 
+  )
+
+
+; I'm sure there must be a better way to write this...
+(defmacro with-cstring ((foreign-string lisp-string) &body body)
+  `(if (stringp ,lisp-string)
+     (ccl:with-cstrs ((,foreign-string ,lisp-string))
+       ,@body)
+     (let ((,foreign-string +null-cstring-pointer+))
+       ,@body)))
+
+
+#| Works but, supposedly the built in method is better
+(defmacro with-cstring ((foreign-string lisp-string) &body body)
+  (let ((result (gensym)))
+    `(let* ((,foreign-string (convert-to-cstring ,lisp-string))
+           (,result ,@body))
+       (dispose-ptr ,foreign-string)
+       ,result))
+  )
+
+|#
+
+
+
+    
+