# HG changeset patch
# User William Astle <lost@l-w.ca>
# Date 1457071176 25200
# Node ID 7f538053492ca6226b0006082a302f62f3cbe9e6
# Parent  c8ae69cdb5a9b3dfb5fbcb55a1d8eaa3462e6d40
Fix a possible uninitialized variable reference

Prevent the "basic" target from attempting to write data values for a code
chunk that happens to end up being zero length. It's not clear that this
could happen but robustness says to guard against it.

diff -r c8ae69cdb5a9 -r 7f538053492c lwasm/output.c
--- a/lwasm/output.c	Thu Mar 03 22:33:40 2016 -0700
+++ b/lwasm/output.c	Thu Mar 03 22:59:36 2016 -0700
@@ -186,17 +186,20 @@
 			}
 		}
 	
-		linelength = write_code_BASIC_fprintf(of, linelength, &linenumber, startaddress);
-		linelength = write_code_BASIC_fprintf(of, linelength, &linenumber, lastaddress);
-	
-		for (cl = startblock; cl != endblock; cl = cl -> next)
+		if (startaddress != -1)
 		{
-			if (cl -> outputl < 0)
-				continue;
+			linelength = write_code_BASIC_fprintf(of, linelength, &linenumber, startaddress);
+			linelength = write_code_BASIC_fprintf(of, linelength, &linenumber, lastaddress);
+	
+			for (cl = startblock; cl != endblock; cl = cl -> next)
+			{
+				if (cl -> outputl < 0)
+					continue;
 		
-			for (outidx=0; outidx<cl -> outputl; outidx++)
-			{
-				linelength = write_code_BASIC_fprintf(of, linelength, &linenumber, cl -> output[outidx]);
+				for (outidx=0; outidx<cl -> outputl; outidx++)
+				{
+					linelength = write_code_BASIC_fprintf(of, linelength, &linenumber, cl -> output[outidx]);
+				}
 			}
 		}