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 f0baa06..63ee2ba 100644 (file)
--- 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)");