From 9649b64c6f72984c53f469dad8dd4221d307e06d Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Tue, 22 Nov 2022 09:59:04 +0100
Subject: ucm: handle empty string also for ${env:} substitution

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 src/ucm/ucm_subs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/ucm/ucm_subs.c b/src/ucm/ucm_subs.c
index 2261bdc2..e62290ea 100644
--- a/src/ucm/ucm_subs.c
+++ b/src/ucm/ucm_subs.c
@@ -490,7 +490,13 @@ static char *rval_env(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char *i
 {
 	char *e;
 
-	e = getenv(id);
+	if (*id == '-') {
+		e = getenv(id + 1);
+		if (e == NULL)
+			e = "";
+	} else {
+		e = getenv(id);
+	}
 	if (e)
 		return strdup(e);
 	return NULL;
-- 
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