jshn: properly support JSON "null" type

Instead of abort parsing, properly deal with "null" values by implementing
support for reading and formatting such values.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
(cherry picked from commit 1c08e80313fd487112c48346889cc57badeef751)

2 files changed, 14 insertions, 3 deletions

diff --git a/jshn.c b/jshn.c
index 79136dd..3188af5 100644
--- a/jshn.c
+++ b/jshn.c
@@ -105,9 +105,6 @@ static int add_json_element(const char *key, json_object *obj)
 {
 	char *type;
 
-	if (!obj)
-		return -1;
-
 	switch (json_object_get_type(obj)) {
 	case json_type_object:
 		type = "object";
@@ -127,6 +124,9 @@ static int add_json_element(const char *key, json_object *obj)
 	case json_type_double:
 		type = "double";
 		break;
+	case json_type_null:
+		type = "null";
+		break;
 	default:
 		return -1;
 	}
@@ -159,6 +159,9 @@ static int add_json_element(const char *key, json_object *obj)
 	case json_type_double:
 		fprintf(stdout, "' %lf;\n", json_object_get_double(obj));
 		break;
+	case json_type_null:
+		fprintf(stdout, "';\n");
+		break;
 	default:
 		return -1;
 	}
@@ -240,6 +243,8 @@ static void jshn_add_object_var(json_object *obj, bool array, const char *prefix
 		new = json_object_new_double(strtod(var, NULL));
 	} else if (!strcmp(type, "boolean")) {
 		new = json_object_new_boolean(!!atoi(var));
+	} else if (!strcmp(type, "null")) {
+		new = NULL;
 	} else {
 		return;
 	}
diff --git a/sh/jshn.sh b/sh/jshn.sh
index bf76edb..1090814 100644
--- a/sh/jshn.sh
+++ b/sh/jshn.sh
@@ -168,6 +168,12 @@ json_add_double() {
 	_json_add_generic double "$1" "$2" "$cur"
 }
 
+json_add_null() {
+	local cur
+	_json_get_var cur JSON_CUR
+	_json_add_generic null "$1" "" "$cur"
+}
+
 # functions read access to json variables
 
 json_load() {