# HG changeset patch
# User Eldar Insafutdinov <e.insafutdinov@gmail.com>
# Date 1284500369 -3600
# Node ID ea6325d0edd9f026ad795694177cc82fddd06dd3
# Parent  95b3ed3cddd55c42fa37300312239586a20bb961
+ RealExp.toCBuffer

diff -r 95b3ed3cddd5 -r ea6325d0edd9 dmd/RealExp.d
--- a/dmd/RealExp.d	Tue Sep 14 15:25:44 2010 +0200
+++ b/dmd/RealExp.d	Tue Sep 14 22:39:29 2010 +0100
@@ -129,7 +129,7 @@
 
 	override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
 	{
-		assert(false);
+	    floatToBuffer(buf, type, value);
 	}
 
 	override void toMangleBuffer(OutBuffer buf)
diff -r 95b3ed3cddd5 -r ea6325d0edd9 dmd/expression/Util.d
--- a/dmd/expression/Util.d	Tue Sep 14 15:25:44 2010 +0200
+++ b/dmd/expression/Util.d	Tue Sep 14 22:39:29 2010 +0100
@@ -71,6 +71,7 @@
 
 import core.stdc.math;
 import core.stdc.string;
+import core.stdc.stdlib;
 
 /***********************************
  * Utility to build a function call out of this reference and argument.
@@ -1771,3 +1772,51 @@
 		 */
 		memcmp(&x1, &x2, REALSIZE - REALPAD) == 0;
 }
+
+void floatToBuffer(OutBuffer buf, Type type, real value)
+{
+    /* In order to get an exact representation, try converting it
+     * to decimal then back again. If it matches, use it.
+     * If it doesn't, fall back to hex, which is
+     * always exact.
+     */
+    char[25] buffer;
+    sprintf(buffer.ptr, "%Lg", value);
+    assert(strlen(buffer.ptr) < buffer.length);
+//#ifdef _WIN32 && __DMC__
+//    char *save = __locale_decpoint;
+//    __locale_decpoint = ".";
+//    real_t r = strtold(buffer, NULL);
+//    __locale_decpoint = save;
+//#else
+    real r = strtold(buffer.ptr, null);
+//#endif
+    if (r == value)			// if exact duplication
+	    buf.writestring(buffer);
+    else
+	    buf.printf("%La", value);	// ensure exact duplication
+
+    if (type)
+    {
+	Type t = type.toBasetype();
+	switch (t.ty)
+	{
+	    case Tfloat32:
+	    case Timaginary32:
+	    case Tcomplex32:
+		buf.writeByte('F');
+		break;
+
+	    case Tfloat80:
+	    case Timaginary80:
+	    case Tcomplex80:
+		buf.writeByte('L');
+		break;
+
+	    default:
+		break;
+	}
+	if (t.isimaginary())
+	    buf.writeByte('i');
+    }
+}
\ No newline at end of file