[TD-5992] add error msg

src/client/src/tscSystem.c

@@ -439,40 +439,29 @@ int taos_options(TSDB_OPTION option, const void *arg, ...) {
 }
 
 #include "cJSON.h"
-typedef struct retMsg{
-  int ret;
-  char *msg;
-} retMsg;
-
-static retMsg taos_set_config_imp(const char *config){
-  retMsg ret = {0, "success"};
-
+static int taos_set_config_imp(const char *config){
   static bool setConfFlag = false;
   if (setConfFlag) {
     tscError("already set config");
-    ret.msg = "already set config";
-    return ret;
+    return -1;
   }
   cJSON *root = cJSON_Parse(config);
   if (root == NULL) {
     tscError("failed to set config, invalid json format: %s", config);
-    ret.ret = -1;
-    ret.msg = "invalid json format";
-    return ret;
+    return -1;
   }
 
+  int ret = 0;
   int size = cJSON_GetArraySize(root);
   for(int i = 0; i < size; i++){
     cJSON *item = cJSON_GetArrayItem(root, i);
     if (!item) {
       tscError("failed to read index:%d", i);
-      ret.ret = -2;
-      ret.msg = "part config failed, please see the log";
+      ret = -2;
       continue;
     }
     if(!taosReadConfigOption(item->string, item->valuestring, NULL, NULL)){
-      ret.ret = -2;
-      ret.msg = "part config failed, please see the log";
+      ret = -2;
     }
   }
   taosPrintGlobalCfg();