From c4f4ee8ecf85834811c252fc1df3892863572bbd Mon Sep 17 00:00:00 2001
From: Nikolai Merinov <n.merinov@inango-systems.com>
Date: Mon, 29 Apr 2019 19:13:37 +0500
Subject: expand: Fix trailing newlines processing in backquote expanding

According to POSIX.1-2008 we should remove newlines only at the end of
the substitution. Newlines-only substitions causes dash to remove
newlines before beggining of the substitution. The following code:

    cat <<END
    1
    $(echo "")
    2
    END

prints "1<newline>2" instead of expected "1<newline><newline>2".

This patch fixes trailing newlines processing in backquote expanding.

Signed-off-by: Nikolai Merinov <n.merinov@inango-systems.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 src/expand.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/expand.c')

diff --git a/src/expand.c b/src/expand.c
index e57efa6..4a5d75a 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -525,7 +525,7 @@ read:
 
 	/* Eat all trailing newlines */
 	dest = expdest;
-	for (; dest > (char *)stackblock() && dest[-1] == '\n';)
+	for (; dest > ((char *)stackblock() + startloc) && dest[-1] == '\n';)
 		STUNPUTC(dest);
 	expdest = dest;
 
-- 
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