1 files changed, 34 insertions, 0 deletions
diff --git a/mpc/src/proj.c b/mpc/src/proj.c
new file mode 100644
index 0000000000..ace58c5331
--- /dev/null
+++ b/mpc/src/proj.c
@@ -0,0 +1,34 @@
+/* mpc_proj -- projection of a complex number onto the Riemann sphere.
+
+Copyright (C) 2008, 2009, 2011 INRIA
+
+This file is part of GNU MPC.
+
+GNU MPC is free software; you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License as published by the
+Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+GNU MPC 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 Lesser General Public License for
+more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program. If not, see http://www.gnu.org/licenses/ .
+*/
+
+#include "mpc-impl.h"
+
+int
+mpc_proj (mpc_ptr a, mpc_srcptr b, mpc_rnd_t rnd)
+{
+   if (mpc_inf_p (b)) {
+      /* infinities project to +Inf +i* copysign(0.0, cimag(z)) */
+      mpfr_set_inf (mpc_realref (a), +1);
+      mpfr_set_zero (mpc_imagref (a), (mpfr_signbit (mpc_imagref (b)) ? -1 : 1));
+      return MPC_INEX (0, 0);
+   }
+   else
+      return mpc_set (a, b, rnd);
+}