# HG changeset patch
# User William Astle <lost@l-w.ca>
# Date 1359607234 25200
# Node ID 67acad9db5b35a063da368d4a1dd2471108a84d1
# Parent  155799f6cfa5197bb254d72fa467830988da5260
Fix crash when no operand is present

In cases where an instruction expects a general operand and nothing is
provided, throw a bad operand error immediately instead of waiting to crash
out with a segmentation fault.

diff -r 155799f6cfa5 -r 67acad9db5b3 lwasm/insn_gen.c
--- a/lwasm/insn_gen.c	Wed Jan 30 21:32:14 2013 -0700
+++ b/lwasm/insn_gen.c	Wed Jan 30 21:40:34 2013 -0700
@@ -41,6 +41,12 @@
 	int v1, tv;
 	lw_expr_t s;
 
+	if (!**p)
+	{
+		lwasm_register_error(as, l, "Bad operand");
+		return;
+	}
+
 	optr2 = *p;
 	while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++
 		/* do nothing */ ;