;;;; Programmers: Kevin M. Rosenberg
;;;; Date Started: Mar 2002
;;;;
-;;;; $Id: clsql-uffi.lisp,v 1.1 2002/09/30 10:19:24 kevin Exp $
+;;;; $Id: clsql-uffi.lisp,v 1.2 2002/12/13 12:21:54 kevin Exp $
;;;;
;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
;;;;
(defmacro split-64-bit-integer (int64)
`(values (ash ,int64 -32) (logand ,int64 +2^32-1+)))
+(defun char-ptr-points-to-null (char-ptr)
+ "Returns T if foreign character pointer refers to 'NULL' string. Only called for numeric entries"
+ ;; Uses short cut and returns T if first character is #\N. It should
+ ;; never be non-numeric
+ (let ((char (uffi:ensure-char-character
+ (uffi:deref-pointer char-ptr :char))))
+ (eql char #\N)))
+
(defun convert-raw-field (char-ptr types index)
(let ((type (if (listp types)
(nth index types)
types)))
- (case type
- (:double
- (atof char-ptr))
- ((or :int32 :int)
- (atoi char-ptr))
- (:int64
- (uffi:with-foreign-object (high32-ptr :int)
- (let ((low32 (atol64 char-ptr high32-ptr))
- (high32 (uffi:deref-pointer high32-ptr :int)))
- (if (zerop high32)
- low32
- (make-64-bit-integer high32 low32)))))
+ (cond
+ ((and (or (eq type :double) (eq type :int32) (eq type :int)
+ (eq type :int64))
+ (char-ptr-points-to-null char-ptr))
+ nil)
(t
- (uffi:convert-from-foreign-string char-ptr)))))
+ (case type
+ (:double
+ (atof char-ptr))
+ ((or :int32 :int)
+ (atoi char-ptr))
+ (:int64
+ (uffi:with-foreign-object (high32-ptr :int)
+ (let ((low32 (atol64 char-ptr high32-ptr))
+ (high32 (uffi:deref-pointer high32-ptr :int)))
+ (if (zerop high32)
+ low32
+ (make-64-bit-integer high32 low32)))))
+ (t
+ (uffi:convert-from-foreign-string char-ptr)))))))
+