1 files changed, 63 insertions, 0 deletions
diff --git a/StdLib/LibC/Main/isinff_ieee754.c b/StdLib/LibC/Main/isinff_ieee754.c
new file mode 100644
index 0000000000..ada1e728f1
--- /dev/null
+++ b/StdLib/LibC/Main/isinff_ieee754.c
@@ -0,0 +1,63 @@
+/*  $NetBSD: isinff_ieee754.c,v 1.1 2004/03/04 23:42:39 kleink Exp $  */
+
+/*
+ * Copyright (c) 1992, 1993
+ *  The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
+ */
+#include  <LibConfig.h>
+#include <sys/EfiCdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: isinff_ieee754.c,v 1.1 2004/03/04 23:42:39 kleink Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <machine/ieee.h>
+#include <math.h>
+
+/*
+ * 7.12.3.3 isinf - test for infinity
+ *          IEEE 754 single-precision version
+ */
+int
+__isinff(float x)
+{
+  union ieee_single_u u;
+
+  u.sngu_f = x;
+
+  return (u.sngu_sng.sng_exp == SNG_EXP_INFNAN &&
+      u.sngu_sng.sng_frac == 0);
+}