These modifications are the result of

WL#2067 add features to mysqltest: "disable_error_abort" + "$mysql_errno"

$mysql_errno is a new builtin variable of mysqltest and contains the
return code of the last command send to the server.

"--disable_abort_on_error" switches the abort of mysqltest
after "unmasked" failing statements off.
"--enable_abort_on_error" switches the abort of mysqltest
after "unmasked" failing statements on. (default)

"Maskings" are
    !$<error number>  and  --error <error number>
in the line before the statement to be checked.

The benefit of the option "--disable_abort_on_error" is that
- all statements after the failing statement are executed
- a r/<test>.reject will be produced
- it is possible to write test cases, which perform
  code sequences depending on the return code of a single
  statement


client/mysqltest.c:
  Implementation of the features
  - "--disable_abort_on_error"/"--enable_abort_on_error" switch
  - "$mysql_errno" variable
mysql-test/r/mysqltest.result:
  test cases for the features added
mysql-test/t/mysqltest.test:
  updated results

1 files changed, 29 insertions, 1 deletions

diff --git a/client/mysqltest.c b/client/mysqltest.c
index 4c87561ab84..21f93b1fc6a 100644
--- a/client/mysqltest.c
+++ b/client/mysqltest.c
@@ -243,6 +243,8 @@ VAR var_reg[10];
 HASH var_hash;
 my_bool disable_query_log=0, disable_result_log=0, disable_warnings=0;
 my_bool disable_info= 1;			/* By default off */
+/* default for disable_abort_on_error: false = abort on unmasked error */
+my_bool disable_abort_on_error= 0;
 
 struct connection cons[MAX_CONS];
 struct connection* cur_con, *next_con, *cons_end;
@@ -274,6 +276,7 @@ Q_ENABLE_WARNINGS, Q_DISABLE_WARNINGS,
 Q_ENABLE_INFO, Q_DISABLE_INFO,
 Q_ENABLE_METADATA, Q_DISABLE_METADATA,
 Q_EXEC, Q_DELIMITER,
+Q_DISABLE_ABORT_ON_ERROR, Q_ENABLE_ABORT_ON_ERROR,
 Q_DISPLAY_VERTICAL_RESULTS, Q_DISPLAY_HORIZONTAL_RESULTS,
 Q_QUERY_VERTICAL, Q_QUERY_HORIZONTAL,
 Q_START_TIMER, Q_END_TIMER,
@@ -352,6 +355,8 @@ const char *command_names[]=
   "disable_metadata",
   "exec",
   "delimiter",
+  "disable_abort_on_error",
+  "enable_abort_on_error",
   "vertical_results",
   "horizontal_results",
   "query_vertical",
@@ -1239,6 +1244,18 @@ int do_let(struct st_query* q)
   return var_set(var_name, var_name_end, var_val_start, q->end);
 }
 
+/* Store an integer (typically the returncode of the last SQL)  */
+/* statement in the mysqltest builtin variable $mysql_errno, by */
+/* simulating of a user statement "let $mysql_errno= <integer>" */
+int var_set_errno(int sql_errno )
+{
+  char var_name[] = "$mysql_errno", var_val[30];
+  sprintf(var_val, "%d", sql_errno);
+  /* On some odd systems, the return value from sprintf() isn't */
+  /* always the length of the string, so we use strlen()        */
+   return var_set(var_name, var_name + 12, var_val, var_val + strlen(var_val));
+}
+
 int do_rpl_probe(struct st_query* q __attribute__((unused)))
 {
   DBUG_ENTER("do_rpl_probe");
@@ -1996,7 +2013,7 @@ int read_query(struct st_query** q_ptr)
   memcpy((gptr) q->expected_errno, (gptr) global_expected_errno,
 	 sizeof(global_expected_errno));
   q->expected_errors= global_expected_errors;
-  q->abort_on_error= global_expected_errors == 0;
+  q->abort_on_error= (global_expected_errors == 0 && !disable_abort_on_error);
   bzero((gptr) global_expected_errno, sizeof(global_expected_errno));
   global_expected_errors=0;
   if (p[0] == '-' && p[1] == '-')
@@ -2642,6 +2659,10 @@ end:
     dynstr_free(&ds_tmp);
   if (q->type == Q_EVAL)
     dynstr_free(&eval_query);
+  /* We save the return code (mysql_errno(mysql)) from the last call sent */
+  /* to the server into the mysqltest builtin variable $mysql_errno. This */
+  /* variable then can be used from the test case itself.                 */
+  var_set_errno(mysql_errno(mysql));
   DBUG_RETURN(error);
 }
 
@@ -3395,6 +3416,11 @@ int main(int argc, char **argv)
 
   init_var_hash(&cur_con->mysql);
 
+  /* Initialize $mysql_errno with -1, so we can                  */
+  /* - distinguish it from valid values ( >= 0 )   and           */
+  /* - detect if there was never a command sent to the server    */
+  var_set_errno(-1);
+
   while (!read_query(&q))
   {
     int current_line_inc = 1, processed = 0;
@@ -3414,6 +3440,8 @@ int main(int argc, char **argv)
       case Q_DISABLE_RPL_PARSE:  do_disable_rpl_parse(q); break;
       case Q_ENABLE_QUERY_LOG:	 disable_query_log=0; break;
       case Q_DISABLE_QUERY_LOG:  disable_query_log=1; break;
+      case Q_ENABLE_ABORT_ON_ERROR:  disable_abort_on_error=0; break;
+      case Q_DISABLE_ABORT_ON_ERROR: disable_abort_on_error=1; break;
       case Q_ENABLE_RESULT_LOG:  disable_result_log=0; break;
       case Q_DISABLE_RESULT_LOG: disable_result_log=1; break;
       case Q_ENABLE_WARNINGS:    disable_warnings=0; break;