* add SIMDB_ERR_USAGE

src/database.c

@@ -170,6 +170,8 @@ simdb_error(int error) {
     return "database opened in read-only mode";
   } else if (error == SIMDB_ERR_NXRECORD) {
     return "no such record in database";
+  } else if (error == SIMDB_ERR_USAGE) {
+    return "wrong parameters passed to finction";
   }
   return "unknown error";
 }

src/simdb.h

@@ -34,6 +34,7 @@
 #define SIMDB_ERR_WRONGVERS   -4 /**< database version mismatch */
 #define SIMDB_ERR_NXRECORD    -5 /**< no such record in database */
 #define SIMDB_ERR_READONLY    -6 /**< database opened in read-only mode */
+#define SIMDB_ERR_USAGE       -7 /**< wrong arguments passed */
 /** @} */
 
 /** opaque database handler */