From: Jaroslav Kysela <perex@perex.cz>
Date: Tue, 26 May 2020 13:32:36 +0000 (+0200)
Subject: ucm: String condition - implement Empty
X-Git-Tag: v1.2.3~38
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=a53a104f79f76b3f7c74f951d371508b938f01be;p=alsa-lib.git

ucm: String condition - implement Empty

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/src/ucm/ucm_cond.c b/src/ucm/ucm_cond.c
index f0baa06a..63ee2ba0 100644
--- a/src/ucm/ucm_cond.c
+++ b/src/ucm/ucm_cond.c
@@ -44,6 +44,23 @@ static int if_eval_string(snd_use_case_mgr_t *uc_mgr, snd_config_t *eval)
 	char *s1, *s2;
 	int err;
 
+	if (uc_mgr->conf_format >= 3) {
+		err = get_string(eval, "Empty", &string1);
+		if (err < 0 && err != -ENOENT) {
+			uc_error("String error (If.Condition.Empty)");
+			return -EINVAL;
+		}
+
+		if (string1) {
+			err = uc_mgr_get_substituted_value(uc_mgr, &s1, string1);
+			if (err < 0)
+				return err;
+			err = s1 == NULL || s1[0] == '\0';
+			free(s1);
+			return err;
+		}
+	}
+
 	err = get_string(eval, "String1", &string1);
 	if (err < 0 && err != -ENOENT) {
 		uc_error("String error (If.Condition.String1)");