r8999: add new function FOREIGN-STRING-LENGTH

[uffi.git] / src / strings.lisp

diff --git a/src/strings.lisp b/src/strings.lisp
index e4d67013a80a1db25ac52324fdf0ffe4993542bb..0585d43ada673ff958cd16b92c0edff088343214 100644 (file)
--- a/src/strings.lisp
+++ b/src/strings.lisp
@@ -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))