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From 1da99396dc65993ba34ac0370ca5d6acda6a3322 Mon Sep 17 00:00:00 2001
From: Mark H Weaver <mhw@netris.org>
Date: Sun, 18 Mar 2018 07:02:37 -0400
Subject: [PATCH] Add support for gdbm-1.14.
As of gdbm-1.14, 'gdbm_errno' no longer exists as a binary interface.
It has been replaced by 'gdbm_errno_location', a function that returns
int*. We now use this new interface if it's available.
---
gdbm.scm | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/gdbm.scm b/gdbm.scm
index b92992f..4d38cc3 100644
--- a/gdbm.scm
+++ b/gdbm.scm
@@ -17,6 +17,9 @@
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
+;; Modified by Mark H Weaver <mhw@netris.org> in March 2018 to support
+;; gdbm-1.14 with its new 'gdbm_errno_location' interface.
+
(define-module (gdbm)
#:use-module (system foreign)
#:use-module (rnrs bytevectors)
@@ -151,10 +154,21 @@
;;; errors
-(define %errno (dynamic-pointer "gdbm_errno" libgdbm))
+(define %list-int
+ (list int))
+
+(define (dereference-int ptr)
+ (apply (lambda (errno) errno)
+ (parse-c-struct ptr %list-int)))
+
+(define %errno-location
+ (or (false-if-exception
+ (let ((func (dynamic-func "gdbm_errno_location" libgdbm)))
+ (pointer->procedure '* func '())))
+ (const (dynamic-pointer "gdbm_errno" libgdbm))))
(define (gdbm-errno)
- (pointer-address (dereference-pointer %errno)))
+ (dereference-int (%errno-location)))
(define (gdbm-error)
(error (pointer->string (%gdbm-strerror (gdbm-errno)))))
--
2.16.2
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