From 4ed6cb59d5135ab5d9b15574f4c4923a50fc1dd7 Mon Sep 17 00:00:00 2001
From: Ken Raeburn <raeburn@mit.edu>
Date: Tue, 15 Sep 2009 06:19:32 +0000
Subject: [PATCH] Test byte ordering determination and unaligned access

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@22762 dc483132-0cff-0310-8789-dd5450dbe970
---
 src/util/support/Makefile.in |  8 +++++--
 src/util/support/t_unal.c    | 46 ++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 src/util/support/t_unal.c

diff --git a/src/util/support/Makefile.in b/src/util/support/Makefile.in
index c890a8c69..e20984a64 100644
--- a/src/util/support/Makefile.in
+++ b/src/util/support/Makefile.in
@@ -153,13 +153,17 @@ T_K5BUF_OBJS= t_k5buf.o k5buf.o $(PRINTF_ST_OBJ)
 t_k5buf: $(T_K5BUF_OBJS)
 	$(CC_LINK) -o t_k5buf $(T_K5BUF_OBJS)
 
-TEST_PROGS= t_k5buf
+t_unal: t_unal.o
+	$(CC_LINK) -o t_unal t_unal.o
+
+TEST_PROGS= t_k5buf t_unal
 
 check-unix:: $(TEST_PROGS)
 	./t_k5buf
+	./t_unal
 
 clean::
-	$(RM) t_k5buf.o t_k5buf
+	$(RM) t_k5buf.o t_k5buf t_unal.o t_unal
 
 @lib_frag@
 @libobj_frag@
diff --git a/src/util/support/t_unal.c b/src/util/support/t_unal.c
new file mode 100644
index 000000000..d9a3cc4b0
--- /dev/null
+++ b/src/util/support/t_unal.c
@@ -0,0 +1,46 @@
+#undef NDEBUG
+#include <assert.h>
+#include "k5-platform.h"
+
+int main ()
+{
+     /* Test some low-level assumptions the Kerberos code depends
+        on.  */
+
+    union {
+        UINT64_TYPE n64;
+        uint32_t n32;
+        uint16_t n16;
+        unsigned char b[9];
+    } u;
+    static unsigned char buf[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };
+
+    assert(load_64_be(buf+1) == 0x0102030405060708LL);
+    assert(load_64_le(buf+1) == 0x0807060504030201LL);
+    assert(load_32_le(buf+2) == 0x05040302);
+    assert(load_32_be(buf+2) == 0x02030405);
+    assert(load_16_be(buf+3) == 0x0304);
+    assert(load_16_le(buf+3) == 0x0403);
+    u.b[0] = 0;
+    assert((store_64_be(0x0102030405060708LL, u.b+1), !memcmp(buf, u.b, 9)));
+    u.b[1] = 9;
+    assert((store_64_le(0x0807060504030201LL, u.b+1), !memcmp(buf, u.b, 9)));
+    u.b[2] = 10;
+    assert((store_32_be(0x02030405, u.b+2), !memcmp(buf, u.b, 9)));
+    u.b[3] = 11;
+    assert((store_32_le(0x05040302, u.b+2), !memcmp(buf, u.b, 9)));
+    u.b[4] = 12;
+    assert((store_16_be(0x0304, u.b+3), !memcmp(buf, u.b, 9)));
+    u.b[4] = 13;
+    assert((store_16_le(0x0403, u.b+3), !memcmp(buf, u.b, 9)));
+    /* Verify that load_*_n properly does native format.  Assume
+       the unaligned thing is okay.  */
+    u.n64 = 0x090a0b0c0d0e0f00LL;
+    assert(load_64_n((unsigned char *) &u.n64) == 0x090a0b0c0d0e0f00LL);
+    u.n32 = 0x06070809;
+    assert(load_32_n((unsigned char *) &u.n32) == 0x06070809);
+    u.n16 = 0x0a0b;
+    assert(load_16_n((unsigned char *) &u.n16) == 0x0a0b);
+
+    return 0;
+}
-- 
2.26.2