From: Todd C. Miller <Todd.Miller@courtesan.com>
Date: Thu, 10 May 2012 14:01:26 +0000 (-0400)
Subject: Add offsetof macro for those without it.
X-Git-Tag: SUDO_1_8_5~1^2~7
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4e0ffceacb29516da52064898cc8b1b09f6bf7ae;p=sudo

Add offsetof macro for those without it.
---

diff --git a/include/missing.h b/include/missing.h
index 658f399da..6f00a5760 100644
--- a/include/missing.h
+++ b/include/missing.h
@@ -122,6 +122,17 @@
 # define MAX(a,b) (((a)>(b))?(a):(b))
 #endif
 
+/*
+ * Older systems may be missing stddef.h and/or offsetof macro
+ */
+#ifndef offsetof
+# ifdef __offsetof
+#  define offsetof(type, field) __offsetof(type, field)
+# else
+#  define offsetof(type, field) ((size_t)(&((type *)0)->field))
+# endif
+#endif
+
 /*
  * Simple isblank() macro and function for systems without it.
  */