added USE_SQLITE3 option

src/db_get_all_users.c

@@ -5,6 +5,7 @@
 #include "user.h"
 
 char *db_get_all_users() {
+#ifdef USE_SQLITE3
   pthread_mutex_lock(&db_mutex);
   if (!db) {
     fprintf(stderr, "Database not initialized\n");
@@ -41,9 +42,9 @@ char *db_get_all_users() {
     const unsigned char *group = sqlite3_column_text(stmt, 4);
     int is_superuser = sqlite3_column_int(stmt, 5);
 
-    char *escaped_username = json_escape((const char *)username);
-    char *escaped_email = json_escape((const char *)email);
-    char *escaped_group = json_escape((const char *)group);
+    char *escaped_username = json_escape((const char *) username);
+    char *escaped_email = json_escape((const char *) email);
+    char *escaped_group = json_escape((const char *) group);
     if (!escaped_username || !escaped_email || !escaped_group) {
       free(escaped_username);
       free(escaped_email);
@@ -97,4 +98,7 @@ char *db_get_all_users() {
   sqlite3_finalize(stmt);
   pthread_mutex_unlock(&db_mutex);
   return result;
-}
+#else
+  return "";
+#endif
+}