parser: Do not print prompt if input buffer is not empty

Do not print a prompt if there is still input left over in the
input buffer.

Add a noinline attribute to setprompt while doing this as otherwise
gcc will produce horrendous output.

Reported-by: Vincent Lefevre <vincent@vinc17.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

src/parser.c

diff --git a/src/parser.c b/src/parser.c
index 461afc5..e44b3c3 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -1712,8 +1712,7 @@
 	/* NOTREACHED */
 }
 
-STATIC void
-setprompt(int which)
+static void __attribute__((noinline)) setprompt(int which)
 {
 	struct stackmark smark;
 	int show;
@@ -1726,7 +1725,7 @@
 #else
 	show = !el;
 #endif
-	if (show) {
+	if (show && !parsefile->nleft) {
 		pushstackmark(&smark, stackblocksize());
 		out2str(getprompt(NULL));
 		popstackmark(&smark);