1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/libf2c/libF77/c_div.c b/contrib/libf2c/libF77/c_div.c
new file mode 100644
index 0000000..b5ede0e
--- /dev/null
+++ b/contrib/libf2c/libF77/c_div.c
@@ -0,0 +1,43 @@
+#include "f2c.h"
+
+extern void sig_die (char *, int);
+void
+c_div (complex * c, complex * a, complex * b)
+{
+  double ratio, den;
+  double abr, abi, cr;
+
+  if ((abr = b->r) < 0.)
+    abr = -abr;
+  if ((abi = b->i) < 0.)
+    abi = -abi;
+  if (abr <= abi)
+    {
+      if (abi == 0)
+	{
+#ifdef IEEE_COMPLEX_DIVIDE
+	  float af, bf;
+	  af = bf = abr;
+	  if (a->i != 0 || a->r != 0)
+	    af = 1.;
+	  c->i = c->r = af / bf;
+	  return;
+#else
+	  sig_die ("complex division by zero", 1);
+#endif
+	}
+      ratio = (double) b->r / b->i;
+      den = b->i * (1 + ratio * ratio);
+      cr = (a->r * ratio + a->i) / den;
+      c->i = (a->i * ratio - a->r) / den;
+    }
+
+  else
+    {
+      ratio = (double) b->i / b->r;
+      den = b->r * (1 + ratio * ratio);
+      cr = (a->r + a->i * ratio) / den;
+      c->i = (a->i - a->r * ratio) / den;
+    }
+  c->r = cr;
+}