Repatch (from linux) of OSX IRAF

1 files changed, 50 insertions, 0 deletions

diff --git a/unix/f2c/libf2c/z_div.c b/unix/f2c/libf2c/z_div.c
new file mode 100644
index 00000000..e45f3608
--- /dev/null
+++ b/unix/f2c/libf2c/z_div.c
@@ -0,0 +1,50 @@
+#include "f2c.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef KR_headers
+extern VOID sig_die();
+VOID z_div(c, a, b) doublecomplex *a, *b, *c;
+#else
+extern void sig_die(const char*, int);
+void z_div(doublecomplex *c, doublecomplex *a, doublecomplex *b)
+#endif
+{
+	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
+			if (a->i != 0 || a->r != 0)
+				abi = 1.;
+			c->i = c->r = abi / abr;
+			return;
+#else
+			sig_die("complex division by zero", 1);
+#endif
+			}
+		ratio = 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 = 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;
+	}
+#ifdef __cplusplus
+}
+#endif