2.5-18.1

1 files changed, 45 insertions, 0 deletions

diff --git a/include/arpa/nameser.h b/include/arpa/nameser.h
index 944fe732a6..efbe956602 100644
--- a/include/arpa/nameser.h
+++ b/include/arpa/nameser.h
@@ -1 +1,46 @@
 #include <resolv/arpa/nameser.h>
+
+/* If the machine allows unaligned access we can do better than using
+   the NS_GET16, NS_GET32, NS_PUT16, and NS_PUT32 macros from the
+   installed header.  */
+#include <string.h>
+#include <stdint.h>
+#include <netinet/in.h>
+
+extern struct _ns_flagdata _ns_flagdata[] attribute_hidden;
+
+#if _STRING_ARCH_unaligned
+
+# undef NS_GET16
+# define NS_GET16(s, cp) \
+  do {									      \
+    uint16_t *t_cp = (uint16_t *) (cp);					      \
+    (s) = ntohs (*t_cp);						      \
+    (cp) += NS_INT16SZ;							      \
+  } while (0)
+
+# undef NS_GET32
+# define NS_GET32(l, cp) \
+  do {									      \
+    uint32_t *t_cp = (uint32_t *) (cp);					      \
+    (l) = ntohl (*t_cp);						      \
+    (cp) += NS_INT32SZ;							      \
+  } while (0)
+
+# undef NS_PUT16
+# define NS_PUT16(s, cp) \
+  do {									      \
+    uint16_t *t_cp = (uint16_t *) (cp);					      \
+    *t_cp = htons (s);							      \
+    (cp) += NS_INT16SZ;							      \
+  } while (0)
+
+# undef NS_PUT32
+# define NS_PUT32(l, cp) \
+  do {									      \
+    uint32_t *t_cp = (uint32_t *) (cp);					      \
+    *t_cp = htonl (l);							      \
+    (cp) += NS_INT32SZ;							      \
+  } while (0)
+
+#endif