1 files changed, 74 insertions, 0 deletions
diff --git a/libstdc++-v3/libmath/clog10l.c b/libstdc++-v3/libmath/clog10l.c
new file mode 100644
index 00000000000..9cec8f88ffe
--- /dev/null
+++ b/libstdc++-v3/libmath/clog10l.c
@@ -0,0 +1,74 @@
+/* Compute complex natural logarithm. */
+
+/* Copyright (C) 1997-1999 Free Software Foundation, Inc.
+
+   This file is part of the GNU ISO C++ Library.  This library 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 library 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 library; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA.
+
+   As a special exception, you may use this file as part of a free software
+   library without restriction.  Specifically, if other files instantiate
+   templates or use macros or inline functions from this file, or you compile
+   this file and link it with other files to produce an executable, this
+   file does not by itself cause the resulting executable to be covered by
+   the GNU General Public License.  This exception does not however
+   invalidate any other reasons why the executable file might be covered by
+   the GNU General Public License.  */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <math.h>
+#include "mathconf.h"
+#ifndef M_PIl
+#define M_PIl M_PI
+#endif
+
+/* Thanks to SGI we have to trick here.  At least Irix 6.2 provides hypotl,
+   but it has a wrong prototype.  Grrr.  */
+extern long double local_hypotl (long double, long double) asm ("hypotl");
+
+
+__complex__ long double
+clog10l (__complex__ long double x)
+{
+  __complex__ long double result;
+
+  if (x == 0.0)
+    {
+      /* Real and imaginary part are 0.0.  */
+      __imag__ result = signbit (__real__ x) ? M_PIl : 0.0;
+      __imag__ result = copysignl (__imag__ result, __imag__ x);
+      /* Yes, the following line raises an exception.  */
+      __real__ result = -1.0 / fabsl (__real__ x);
+    }
+  else if (__real__ x == __real__ x && __imag__ x == __imag__ x)
+    {
+      /* Neither real nor imaginary part is NaN.  */
+      __real__ result = log10l (local_hypotl (__real__ x, __imag__ x));
+      __imag__ result = atan2l (__imag__ x, __real__ x);
+    }
+  else
+    {
+      __imag__ result = NAN;
+      if (INFINITEL_P (__real__ x) || INFINITEL_P (__imag__ x))
+	/* Real or imaginary part is infinite.  */
+	__real__ result = HUGE_VALL;
+      else
+	__real__ result = NAN;
+    }
+
+  return result;
+}