From e787b211a5aa9c06cb319f50479665d43a8f426e Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 4 Jul 2019 17:38:17 +0200
Subject: [PATCH] json: add new json_variant_is_blank_{object,array}() helpers

---
 src/shared/json.c | 13 +++++++++++++
 src/shared/json.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/src/shared/json.c b/src/shared/json.c
index c3efb11bbb..84ad6dd02b 100644
--- a/src/shared/json.c
+++ b/src/shared/json.c
@@ -946,6 +946,19 @@ mismatch:
         return false;
 }
 
+bool json_variant_is_blank_object(JsonVariant *v) {
+        /* Returns true if the specified object is null or empty */
+        return !v ||
+                json_variant_is_null(v) ||
+                (json_variant_is_object(v) && json_variant_elements(v) == 0);
+}
+
+bool json_variant_is_blank_array(JsonVariant *v) {
+        return !v ||
+                json_variant_is_null(v) ||
+                (json_variant_is_array(v) && json_variant_elements(v) == 0);
+}
+
 JsonVariantType json_variant_type(JsonVariant *v) {
 
         if (!v)
diff --git a/src/shared/json.h b/src/shared/json.h
index 1f9c620ebb..59962049d7 100644
--- a/src/shared/json.h
+++ b/src/shared/json.h
@@ -120,6 +120,8 @@ static inline bool json_variant_is_null(JsonVariant *v) {
 }
 
 bool json_variant_is_negative(JsonVariant *v);
+bool json_variant_is_blank_object(JsonVariant *v);
+bool json_variant_is_blank_array(JsonVariant *v);
 
 size_t json_variant_elements(JsonVariant *v);
 JsonVariant *json_variant_by_index(JsonVariant *v, size_t index);