r8999: add new function FOREIGN-STRING-LENGTH

[uffi.git] / src / strings.lisp

diff --git a/src/strings.lisp b/src/strings.lisp
index 250df2e67734ba18bcaa27b274e606977ea411c4..0585d43ada673ff958cd16b92c0edff088343214 100644 (file)
--- a/src/strings.lisp
+++ b/src/strings.lisp
@@ -156,7 +156,7 @@ that LW/CMU automatically converts strings from c-calls."
   `(if (zerop ,obj)
        nil
      (if (eq ,locale :none)
-        (fast-native-to-string ,obj)
+        (fast-native-to-string ,obj ,length)
        (excl:native-to-string
        ,obj 
        ,@(when length (list :length length))
@@ -165,7 +165,7 @@ that LW/CMU automatically converts strings from c-calls."
   `(if (fli:null-pointer-p ,obj)
        nil
      (if (eq ,locale :none)
-        (fast-native-to-string ,obj)
+        (fast-native-to-string ,obj ,length)
        (fli:convert-from-foreign-string 
        ,obj
        ,@(when length (list :length length))
@@ -223,6 +223,15 @@ that LW/CMU automatically converts strings from c-calls."
   `(new-ptr ,size)
   )
 
+(defun foreign-string-length (foreign-string)
+  #+allegro `(ff:foreign-strlen ,ptr)
+  #-allegro
+  `(loop with size = 0
+    until (char= (deref-array ,ptr '(:array :unsigned-char) size) #\Null)
+    do (incf size)
+    finally return size))
+
+
 (defmacro with-foreign-string ((foreign-string lisp-string) &body body)
   (let ((result (gensym)))
     `(let* ((,foreign-string (convert-to-foreign-string ,lisp-string))
@@ -311,45 +320,22 @@ that LW/CMU automatically converts strings from c-calls."
 (def-type char-ptr-def (* :unsigned-char))
 
 #+(or lispworks (and allegro (not ics)))
-(defun fast-native-to-string (s)
+(defun fast-native-to-string (s len)
   (declare (optimize (speed 3) (space 0) (safety 0) (compilation-speed 0))
           (type char-ptr-def s))
-  (let* ((len (strlen s))
-        (str (make-string len)))
+  (let* ((len (or len (strlen s)))
+         (str (make-string len)))
     (declare (fixnum len)
             (type (simple-array (signed-byte 8) (*)) str))
     (dotimes (i len str)
-      (setf (aref str i) (uffi:deref-array s '(:array :char) i)))))
+      (setf (aref str i) 
+       (uffi:deref-array s '(:array :char) i)))))
 
 #+(and allegro ics)
-(defun fast-native-to-string (s)
+(defun fast-native-to-string (s len)
   (declare (optimize (speed 3) (space 0) (safety 0) (compilation-speed 0))
           (type char-ptr-def s))
-  (let* ((len (strlen s))
-        (str (make-string len)))
-    (declare (fixnum len))
-    (dotimes (i len str)
-      (setf (schar str i) (ensure-char-character
-                         (uffi:deref-array s '(:array :char) i))))))
-
-#+ignore
-(defun fast-native-to-string (s)
-  (declare (optimize (speed 3) (space 0) (safety 0) (compilation-speed 0) (debug 0))
-          (type char-ptr-def s))
-  (let* ((len (strlen s))
-        (len4 (the fixnum (ash (the fixnum len) -2)))
-        (end4 (the fixnum (ash (the fixnum len4) 2)))
-        (remainder (the fixnum (- len end4)))
-        (str (make-string len))
-        (str4 str))
-    (declare (type fixnum len len4 end4 remainder)
-            (type (simple-array (signed-byte 32) (*)) str4)
-            (type (simple-array (signed-byte 8) (*)) str))
-    (dotimes (i len4)
-      (declare (fixnum i))
-      (setf (aref str4 i) (uffi:deref-array s '(:array :int) i)))
-    (dotimes (i remainder)
-      (declare (fixnum i))
-      (setf (aref str end4) (uffi:deref-array s '(:array :char) end4))
-      (incf end4))
-    str))
+  (let* ((len (or len (strlen s)))
+         (str (make-string len)))
+      (dotimes (i len str)
+        (setf (schar str i) (code-char (uffi:deref-array s '(:array :byte) i))))))