From: simon <simon@cda61777-01e9-0310-a592-d414129be87e>
Date: Fri, 18 May 2012 19:51:11 +0000 (+0000)
Subject: Enhance my 'sresize' macro so that it type-checks the pointer you pass
X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/commitdiff_plain/9c3b78f422dbffc8fcd93fd2743f75fca45a926a

Enhance my 'sresize' macro so that it type-checks the pointer you pass
_in_ to it, as well as the one it returns. Why have I never thought of
doing that before?!


git-svn-id: svn://svn.tartarus.org/sgt/putty@9539 cda61777-01e9-0310-a592-d414129be87e
---

diff --git a/puttymem.h b/puttymem.h
index 06c294d9..6ef3f794 100644
--- a/puttymem.h
+++ b/puttymem.h
@@ -37,6 +37,7 @@ void safefree(void *);
  */
 #define snew(type) ((type *)snmalloc(1, sizeof(type)))
 #define snewn(n, type) ((type *)snmalloc((n), sizeof(type)))
-#define sresize(ptr, n, type) ((type *)snrealloc((ptr), (n), sizeof(type)))
+#define sresize(ptr, n, type) \
+    ((type *)snrealloc((sizeof((type *)0 == (ptr)), (ptr)), (n), sizeof(type)))
 
 #endif