--- /dev/null
+;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: UFFI -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name: strings.cl
+;;;; Purpose: UFFI source to handle strings, cstring and foreigns
+;;;; Programmer: Kevin M. Rosenberg
+;;;; Date Started: Feb 2002
+;;;;
+;;;; $Id: strings.cl,v 1.1 2002/09/16 17:54:30 kevin Exp $
+;;;;
+;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
+;;;;
+;;;; 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)
+
+
+(def-constant +null-cstring-pointer+
+ #+cmu nil
+ #+allegro 0
+ #+lispworks (fli:make-pointer :address 0 :type '(:unsigned :char))
+ #-(or cmu allegro lispworks) nil
+)
+
+(defmacro convert-from-cstring (obj)
+ "Converts a string from a c-call. Same as convert-from-foreign-string, except
+that LW/CMU automatically converts strings from c-calls."
+ #+cmu obj
+ #+lispworks obj
+ #+allegro
+ (let ((stored (gensym)))
+ `(let ((,stored ,obj))
+ (if (zerop ,stored)
+ nil
+ (values (excl:native-to-string ,stored)))))
+ )
+
+(defmacro convert-to-cstring (obj)
+ #+cmu obj
+ #+lispworks obj
+ #+allegro
+ `(if (null ,obj)
+ 0
+ (values (excl:string-to-native ,obj)))
+ )
+
+(defmacro free-cstring (obj)
+ #+cmu (declare (ignore obj))
+ #+lispworks (declare (ignore obj))
+ #+allegro
+ `(unless (zerop obj)
+ (ff:free-fobject ,obj))
+ )
+
+(defmacro with-cstring ((cstring lisp-string) &body body)
+ #+cmu
+ `(let ((,cstring ,lisp-string)) ,@body)
+ #+lispworks
+ `(let ((,cstring ,lisp-string)) ,@body)
+ #+allegro
+ (let ((acl-native (gensym)))
+ `(excl:with-native-string (,acl-native ,lisp-string)
+ (let ((,cstring (if ,lisp-string ,acl-native 0)))
+ ,@body)))
+ )
+
+(defmacro with-cstrings (bindings &rest body)
+ (if bindings
+ `(with-cstring ,(car bindings)
+ (with-cstrings ,(cdr bindings)
+ ,@body))
+ `(progn ,@body)))
+
+;;; Foreign string functions
+
+(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)))
+ `(etypecase ,obj
+ (null
+ (alien:sap-alien (system:int-sap 0) (* (alien:unsigned 8))))
+ (string
+ (let* ((,size (length ,obj))
+ (,storage (alien:make-alien (alien:unsigned 8) (1+ ,size))))
+ (setq ,storage (alien:cast ,storage (* (alien:unsigned 8))))
+ (locally
+ (declare (optimize (speed 3) (safety 0)))
+ (dotimes (,i ,size)
+ (declare (fixnum ,i))
+ (setf (alien:deref ,storage ,i) (char-code (char ,obj ,i))))
+ (setf (alien:deref ,storage ,size) 0))
+ ,storage))))
+ )
+
+
+;; 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
+ `(if (null-pointer-p ,obj)
+ nil
+ (cmucl-naturalize-cstring (alien:alien-sap ,obj)
+ :length ,length
+ :null-terminated-p ,null-terminated-p))
+ )
+
+
+
+(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)
+ )
+
+(defmacro with-foreign-string ((foreign-string lisp-string) &body body)
+ (let ((result (gensym)))
+ `(let* ((,foreign-string (convert-to-foreign-string ,lisp-string))
+ (,result (progn ,@body)))
+ (declare (dynamic-extent ,foreign-string))
+ (free-foreign-object ,foreign-string)
+ ,result)))
+
+
+;; Modified from CMUCL's source to handle non-null terminated strings
+#+cmu
+(defun cmucl-naturalize-cstring (sap &key
+ length
+ (null-terminated-p t))
+ (declare (type system:system-area-pointer sap))
+ (locally
+ (declare (optimize (speed 3) (safety 0)))
+ (let ((null-terminated-length
+ (when null-terminated-p
+ (loop
+ for offset of-type fixnum upfrom 0
+ until (zerop (system:sap-ref-8 sap offset))
+ finally (return offset)))))
+ (if length
+ (if (and null-terminated-length
+ (> (the fixnum length) (the fixnum null-terminated-length)))
+ (setq length null-terminated-length))
+ (setq length null-terminated-length)))
+ (let ((result (make-string length)))
+ (kernel:copy-from-system-area sap 0
+ result (* vm:vector-data-offset
+ vm:word-bits)
+ (* length vm:byte-bits))
+ result)))
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