Bug #49130 Running mtr tests with valgrind and debug produces lots of warnings

Use safe output formats for strings that are not null terminated.


sql/item_func.cc:
  Use "%*.s" rather than "%s" format.
sql/protocol.cc:
  Use "%*.s" rather than "%s" format.
sql/sql_test.cc:
  Improve output from print_where()
   - output (nil) predicate if predicate is null
   - also output pointer value, for tracing of assignment and copying of predicates
sql/sql_view.cc:
  Use "%*.s" rather than "%s" format.

sql/item_func.cc

@@ -3127,7 +3127,7 @@ String *udf_handler::val_str(String *str,String *save_str)
   if (res == str->ptr())
   {
     str->length(res_length);
-    DBUG_PRINT("exit", ("str: %s", str->ptr()));
+    DBUG_PRINT("exit", ("str: %*.s", (int) str->length(), str->ptr()));
     DBUG_RETURN(str);
   }
   save_str->set(res, res_length, str->charset());

sql/protocol.cc

@@ -1012,8 +1012,8 @@ bool Protocol_text::store(const char *from, size_t length,
 {
   CHARSET_INFO *tocs= this->thd->variables.character_set_results;
 #ifndef DBUG_OFF
-  DBUG_PRINT("info", ("Protocol_text::store field %u (%u): %s", field_pos,
-                      field_count, from));
+  DBUG_PRINT("info", ("Protocol_text::store field %u (%u): %*.s",
+                      field_pos, field_count, (int) length, from));
   DBUG_ASSERT(field_pos < field_count);
   DBUG_ASSERT(field_types == 0 ||
 	      field_types[field_pos] == MYSQL_TYPE_DECIMAL ||

sql/sql_test.cc

@@ -55,19 +55,18 @@ static const char *lock_descriptions[] =
 void
 print_where(COND *cond,const char *info, enum_query_type query_type)
 {
+  char buff[256];
+  String str(buff,(uint32) sizeof(buff), system_charset_info);
+  str.length(0);
   if (cond)
-  {
-    char buff[256];
-    String str(buff,(uint32) sizeof(buff), system_charset_info);
-    str.length(0);
     cond->print(&str, query_type);
-    str.append('\0');
-    DBUG_LOCK_FILE;
-    (void) fprintf(DBUG_FILE,"\nWHERE:(%s) ",info);
-    (void) fputs(str.ptr(),DBUG_FILE);
-    (void) fputc('\n',DBUG_FILE);
-    DBUG_UNLOCK_FILE;
-  }
+  str.append('\0');
+
+  DBUG_LOCK_FILE;
+  (void) fprintf(DBUG_FILE,"\nWHERE:(%s) %p ", info, cond);
+  (void) fputs(str.ptr(),DBUG_FILE);
+  (void) fputc('\n',DBUG_FILE);
+  DBUG_UNLOCK_FILE;
 }
 	/* This is for debugging purposes */
 

sql/sql_view.cc

@@ -819,7 +819,8 @@ static int mysql_register_view(THD *thd, TABLE_LIST *view,
 
     thd->variables.sql_mode|= sql_mode;
   }
-  DBUG_PRINT("info", ("View: %s", view_query.ptr()));
+  DBUG_PRINT("info",
+             ("View: %*.s", (int) view_query.length(), view_query.ptr()));
 
   /* fill structure */
   view->source= thd->lex->create_view_select;