Add isinf module.

[gnulib.git] / lib / isinf.c

diff --git a/lib/isinf.c b/lib/isinf.c
new file mode 100644 (file)
index 0000000..56ca9ae
--- /dev/null
+++ b/lib/isinf.c
@@ -0,0 +1,37 @@
+/* Test for positive or negative infinity.
+   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Ben Pfaff <blp@gnu.org>, 2008. */
+
+#include <config.h>
+
+#include <float.h>
+
+int gl_isinff (float x)
+{
+  return x < -FLT_MAX || x > FLT_MAX;
+}
+
+int gl_isinfd (double x)
+{
+  return x < -DBL_MAX || x > DBL_MAX;
+}
+
+int gl_isinfl (long double x)
+{
+  return x < -LDBL_MAX || x > LDBL_MAX;
+}