Support cross-compilation of <wctype.h>.

[gnulib.git] / lib / logl.c

diff --git a/lib/logl.c b/lib/logl.c
index 374b731..4694645 100644 (file)
--- a/lib/logl.c
+++ b/lib/logl.c
@@ -1,3 +1,23 @@
+/* Copyright 2001 by Stephen L. Moshier <moshier@na-net.ornl.gov>
+
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <math.h>
+
 /*                                                     logll.c
  *
  * Natural logarithm for 128-bit long double precision.
@@ -42,26 +62,7 @@
  *
  */
 
-#include <math.h>
-
-#include "mathl.h"
-
-/* Copyright 2001 by Stephen L. Moshier <moshier@na-net.ornl.gov>
-
-   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; see the file COPYING.
-   If not, write to the Free Software Foundation,
-   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+#include "isnanl.h"
 
 /* log(1+x) = x - .5 x^2 + x^3 l(x)
    -.0078125 <= x <= +.0078125
@@ -189,12 +190,16 @@ long double
 logl(long double x)
 {
   long double z, y, w;
-  long double u, t;
-  unsigned int m;
+  long double t;
   int k, e;
 
   /* Check for IEEE special cases.  */
 
+  /* log(NaN) = NaN. */
+  if (isnanl (x))
+    {
+      return x;
+    }
   /* log(0) = -infinity. */
   if (x == 0.0L)
     {
@@ -205,8 +210,8 @@ logl(long double x)
     {
       return (x - x) / ZERO;
     }
-  /* log (infinity or NaN) */
-  if (x + x == x || x != x)
+  /* log (infinity) */
+  if (x + x == x)
     {
       return x + x;
     }