Merge "halloc: Cast the offsetof macro to ptrdiff_t before negating"

a43bdcd7 · Johann Koenig · Gerrit Code Review · e34e5419 · bf8c6207 · a43bdcd7
Commit a43bdcd7 authored 11 years ago by Johann Koenig Committed by Gerrit Code Review 11 years ago
--- a/nestegg/halloc/src/macros.h
+++ b/nestegg/halloc/src/macros.h
@@ -20,7 +20,7 @@
 /*
 	restore pointer to the structure by a pointer to its field
 */
-#define structof(p,t,f) ((t*)(- offsetof(t,f) + (char*)(p)))
+#define structof(p,t,f) ((t*)(- (ptrdiff_t) offsetof(t,f) + (char*)(p)))
 /*
 *	redefine for the target compiler