From: Harlan Stenn <stenn@ntp.org>
Date: Fri, 26 Jun 2015 10:58:41 +0000 (+0000)
Subject: smeartest.c - Harlan Stenn
X-Git-Tag: NTP_4_2_8P3_RC3~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=349821cc02e3205d950a10051e4359684bd62275;p=thirdparty%2Fntp.git

smeartest.c - Harlan Stenn

bk: 558d30618t4VTBexShgf1TJ_DWg67Q
---

diff --git a/tests/sandbox/Makefile.am b/tests/sandbox/Makefile.am
index c79e5be48..489ceab57 100644
--- a/tests/sandbox/Makefile.am
+++ b/tests/sandbox/Makefile.am
@@ -5,7 +5,7 @@ CLEANFILES =
 
 run_unity =	cd $(srcdir) && ruby ../../sntp/unity/auto/generate_test_runner.rb
 
-check_PROGRAMS = bug-2803 first-test second-test
+check_PROGRAMS = bug-2803 first-test second-test smeartest
 
 # HMS: we may not need some of these:
 LDADD =					\
diff --git a/tests/sandbox/smeartest.c b/tests/sandbox/smeartest.c
new file mode 100644
index 000000000..9b07581d6
--- /dev/null
+++ b/tests/sandbox/smeartest.c
@@ -0,0 +1,104 @@
+#include <config.h>
+
+#include <ntp.h>
+#include <ntp_fp.h>
+
+/*
+ * we want to test a refid format of:
+ * 254.x.y.x
+ *
+ * where x.y.z are 24 bits containing 2 (signed) integer bits
+ * and 22 fractional bits.
+ *
+ * we want functions to convert to/from this format, with unit tests.
+ *
+ * Interesting test cases include:
+ * 254.0.0.0
+ * 254.0.0.1
+ * 254.127.255.255
+ * 254.128.0.0
+ * 254.255.255.255
+ */
+
+char *progname = "";
+
+l_fp convertRefIDToLFP(uint32_t r);
+uint32_t convertLFPToRefID(l_fp num);
+
+
+/*
+ * The smear data in the refid is the bottom 3 bytes of the refid,
+ * 2 bits of integer
+ * 22 bits of fraction
+ */
+l_fp
+convertRefIDToLFP(uint32_t r)
+{
+	l_fp temp;
+
+	printf("%02x %02x %02x %x: ",
+		(r >> 22) & 0x3,
+		(r >> 14) & 0xff,
+		(r >>  6) & 0xff,
+		(r & 0x0f)
+		);
+
+	temp.l_ui = (r >> 22) & 0x3;
+	temp.l_uf = ((uint32_t) ((r >> 14) & 0xFF) << 26)
+		  | ((uint32_t) ((r >>  6) & 0xFF) << 18)
+		  | ((uint32_t) ((r >>  0) & 0x0F) << 10);
+
+	if (temp.l_ui & 2)
+		temp.l_ui |= 0xFFFFFFFEu;
+
+	return temp;
+}
+
+
+uint32_t
+convertLFPToRefID(l_fp num)
+{
+	uint32_t temp;
+
+	temp  = (uint8_t) (num.l_ui << 6) | (num.l_uf >> 26);
+	temp |= (uint8_t) (num.l_uf >> 18);
+	temp |= (uint8_t) (num.l_uf >> 10);
+
+	return temp;
+}
+
+
+void rtol(uint32_t r);
+
+void
+rtol(uint32_t r)
+{
+	l_fp l;
+
+	// l = convertRefIDToLFP(htonl(r));
+	l = convertRefIDToLFP(r);
+	printf("refid %#x, smear %s\n", r, lfptoa(&l, 8));
+
+	return;
+}
+
+
+main()
+{
+
+	rtol(0xfe800000);
+	rtol(0xfe800001);
+	rtol(0xfe8ffffe);
+	rtol(0xfe8fffff);
+	rtol(0xfefffffe);
+	rtol(0xfeffffff);
+
+	rtol(0xfe000000);
+	rtol(0xfe000001);
+	rtol(0xfe3ffffe);
+	rtol(0xfe3fffff);
+	rtol(0xfe7ffffe);
+	rtol(0xfe7fffff);
+
+	return 0;
+}