From cdcb57035b4584fe754a6f9a8a18b47cc2b8fc27 Mon Sep 17 00:00:00 2001
From: tobiasu <>
Date: Sat, 7 Jun 2014 01:47:02 +0000
Subject: Add basic regression test for modf() issue.

encouraged by deraadt and miod
---
 src/regress/lib/libc/Makefile         |  4 ++--
 src/regress/lib/libc/modf/Makefile    |  3 +++
 src/regress/lib/libc/modf/modf_test.c | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 src/regress/lib/libc/modf/Makefile
 create mode 100644 src/regress/lib/libc/modf/modf_test.c

(limited to 'src')

diff --git a/src/regress/lib/libc/Makefile b/src/regress/lib/libc/Makefile
index 3109c0c1fd..f138f16ffd 100644
--- a/src/regress/lib/libc/Makefile
+++ b/src/regress/lib/libc/Makefile
@@ -1,8 +1,8 @@
-#	$OpenBSD: Makefile,v 1.38 2013/12/29 01:39:44 martynas Exp $
+#	$OpenBSD: Makefile,v 1.39 2014/06/07 01:46:40 tobiasu Exp $
 
 SUBDIR+= _setjmp alloca atexit basename cephes cxa-atexit db dirname env
 SUBDIR+= fmemopen fnmatch fpclassify getcap getopt_long glob
-SUBDIR+= hsearch longjmp locale malloc mkstemp netdb open_memstream 
+SUBDIR+= hsearch longjmp locale malloc mkstemp modf netdb open_memstream
 SUBDIR+= orientation popen printf
 SUBDIR+= regex setjmp setjmp-signal sigreturn sigsetjmp sprintf
 SUBDIR+= stdio_threading stpncpy strerror strtod strtol strtonum
diff --git a/src/regress/lib/libc/modf/Makefile b/src/regress/lib/libc/modf/Makefile
new file mode 100644
index 0000000000..587c595f12
--- /dev/null
+++ b/src/regress/lib/libc/modf/Makefile
@@ -0,0 +1,3 @@
+PROG=modf_test
+
+.include <bsd.regress.mk>
diff --git a/src/regress/lib/libc/modf/modf_test.c b/src/regress/lib/libc/modf/modf_test.c
new file mode 100644
index 0000000000..f732533635
--- /dev/null
+++ b/src/regress/lib/libc/modf/modf_test.c
@@ -0,0 +1,35 @@
+/* Public domain, 2014, Tobias Ulmer <tobiasu@tmux.org> */
+
+/* Test for bug introduced in 4.4BSD modf() on sparc */
+
+#include <math.h>
+
+#define BIGFLOAT (5e15) /* Number large enough to trigger the "big" case */
+
+int
+main(void)
+{
+	double f, i;
+
+	f = modf(BIGFLOAT, &i);
+	if (i != BIGFLOAT)
+		return 1;
+	if (f != 0.0)
+		return 1;
+
+	/* Repeat, maybe we were lucky */
+	f = modf(BIGFLOAT, &i);
+	if (i != BIGFLOAT)
+		return 1;
+	if (f != 0.0)
+		return 1;
+
+	/* With negative number, for good measure */
+	f = modf(-BIGFLOAT, &i);
+	if (i != -BIGFLOAT)
+		return 1;
+	if (f != 0.0)
+		return 1;
+
+	return 0;
+}
-- 
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