Json helper functions.

src/json_help.c

@@ -0,0 +1,106 @@
+/*
+Copyright (c) 2020 Roger Light <[email protected]>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+ http:https://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+ http:https://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+ Roger Light - initial implementation and documentation.
+*/
+
+#include "config.h"
+
+#include <cJSON.h>
+#include <stdbool.h>
+
+#include "mosquitto_broker_internal.h"
+
+
+int json_get_bool(cJSON *json, const char *name, bool *value, bool optional, bool default_value)
+{
+ cJSON *jtmp;
+
+ if(optional == true){
+ *value = default_value;
+ }
+
+ jtmp = cJSON_GetObjectItemCaseSensitive(json, name);
+ if(jtmp){
+ if(cJSON_IsBool(jtmp) == false){
+ return MOSQ_ERR_INVAL;
+ }
+ *value = cJSON_IsTrue(jtmp);
+ }else{
+ if(optional == false){
+ return MOSQ_ERR_INVAL;
+ }
+ }
+ return MOSQ_ERR_SUCCESS;
+}
+
+
+int json_get_int(cJSON *json, const char *name, int *value, bool optional, int default_value)
+{
+ cJSON *jtmp;
+
+ if(optional == true){
+ *value = default_value;
+ }
+
+ jtmp = cJSON_GetObjectItemCaseSensitive(json, name);
+ if(jtmp){
+ if(cJSON_IsNumber(jtmp) == false){
+ return MOSQ_ERR_INVAL;
+ }
+ *value = jtmp->valueint;
+ }else{
+ if(optional == false){
+ return MOSQ_ERR_INVAL;
+ }
+ }
+ return MOSQ_ERR_SUCCESS;
+}
+
+
+int json_get_string(cJSON *json, const char *name, char **value, bool optional)
+{
+ cJSON *jtmp;
+
+ *value = NULL;
+
+ jtmp = cJSON_GetObjectItemCaseSensitive(json, name);
+ if(jtmp){
+ if(cJSON_IsString(jtmp) == false){
+ return MOSQ_ERR_INVAL;
+ }
+ *value = jtmp->valuestring;
+ }else{
+ if(optional == false){
+ return MOSQ_ERR_INVAL;
+ }
+ }
+ return MOSQ_ERR_SUCCESS;
+}
+
+
+/* Return a number as a number, or attempt to convert a string to a number, or a bool to a number */
+double json_get_as_number(const cJSON *json)
+{
+ char *endptr = NULL;
+
+ if(cJSON_IsNumber(json)){
+ return json->valuedouble;
+ }else if(cJSON_IsString(json)){
+ return strtod(json->valuestring, &endptr);
+ }else if(cJSON_IsBool(json)){
+ return cJSON_IsTrue(json);
+ }else{
+ return 0.0;
+ }
+}

src/json_help.h

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+#ifndef JSON_HELP_H
+#define JSON_HELP_H
+/*
+Copyright (c) 2020 Roger Light <[email protected]>
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License v1.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+ http:https://www.eclipse.org/legal/epl-v10.html
+and the Eclipse Distribution License is available at
+ http:https://www.eclipse.org/org/documents/edl-v10.php.
+
+Contributors:
+ Roger Light - initial implementation and documentation.
+*/
+#include <cJSON.h>
+#include <stdbool.h>
+
+int json_get_bool(cJSON *json, const char *name, bool *value, bool optional, bool default_value);
+int json_get_int(cJSON *json, const char *name, int *value, bool optional, int default_value);
+int json_get_string(cJSON *json, const char *name, char **value, bool optional);
+double json_get_as_number(const cJSON *json);
+
+#endif