From 3f0131f65b888f7bfb635fdbf82891b884cd2f91 Mon Sep 17 00:00:00 2001
From: Stefan Farfeleder <stefanf@FreeBSD.org>
Date: Thu, 8 Dec 2005 21:00:39 +0000
Subject: [PATCH] Print empty quotes ('') when an empty string is passed to
 outqstr(). This makes a difference for the trap builtin, where after "trap ''
 0" we printed "trap -- quit".  This is wrong, because an empty action means
 to reset the action to the default.  A side effect of this commit is that
 empty variables are now printed as "variable=''" instead of just "variable=".

---
 bin/sh/output.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/bin/sh/output.c b/bin/sh/output.c
index 3550cb7ecb7..b59e11e0e87 100644
--- a/bin/sh/output.c
+++ b/bin/sh/output.c
@@ -134,6 +134,10 @@ outqstr(const char *p, struct output *file)
 {
 	char ch;
 
+	if (p[0] == '\0') {
+		outstr("''", file);
+		return;
+	}
 	if (p[strcspn(p, "|&;<>()$`\\\"'")] == '\0' && (!ifsset() ||
 	    p[strcspn(p, ifsval())] == '\0')) {
 		outstr(p, file);