From: Adam Dickmeiss <adam@indexdata.dk>
Date: Tue, 9 Mar 2010 08:53:07 +0000 (+0100)
Subject: wrbuf_destroy allows NULL WRBUF passed to it
X-Git-Tag: v4.0.2~2
X-Git-Url: http://git.indexdata.com/?p=yaz-moved-to-github.git;a=commitdiff_plain;h=055f23ee3692349a03f681ef1a0d5fd70c0cc770

wrbuf_destroy allows NULL WRBUF passed to it
---

diff --git a/include/yaz/wrbuf.h b/include/yaz/wrbuf.h
index 46b38f5..0f393a6 100644
--- a/include/yaz/wrbuf.h
+++ b/include/yaz/wrbuf.h
@@ -53,6 +53,8 @@ YAZ_EXPORT WRBUF wrbuf_alloc(void);
 
 /** \brief destroy WRBUF and its buffer
     \param b WRBUF
+ 
+    For YAZ 4.0.2 WRBUF b may be NULL.
  */
 YAZ_EXPORT void wrbuf_destroy(WRBUF b);
 
diff --git a/src/wrbuf.c b/src/wrbuf.c
index e6c53e8..31729b0 100644
--- a/src/wrbuf.c
+++ b/src/wrbuf.c
@@ -35,8 +35,11 @@ WRBUF wrbuf_alloc(void)
 
 void wrbuf_destroy(WRBUF b)
 {
-    xfree(b->buf);
-    xfree(b);
+    if (b)
+    {
+        xfree(b->buf);
+        xfree(b);
+    }
 }
 
 void wrbuf_rewind(WRBUF b)
diff --git a/test/tstwrbuf.c b/test/tstwrbuf.c
index 8b94634..af06e40 100644
--- a/test/tstwrbuf.c
+++ b/test/tstwrbuf.c
@@ -12,10 +12,13 @@
 static void tstwrbuf(void)
 {
     int step;
-    WRBUF wr = wrbuf_alloc();
+    WRBUF wr;
 
-    YAZ_CHECK(wr);
+    wr = 0;
+    wrbuf_destroy(wr);
 
+    wr = wrbuf_alloc();
+    YAZ_CHECK(wr);
     wrbuf_destroy(wr);
 
     wr = wrbuf_alloc();