A fix and test case for Bug#6049 "Loss of sign when using prepared

statements and negative time/date values". 
The bug was in wrong sprintf format used in the client library.
The fix moves TIME -> string conversion functions to sql-common and
utilized them in the client library.


include/my_time.h:
  Declarations for new functions shared between the client and server.
libmysql/libmysql.c:
  Fix for Bug#6049 "Loss of sign when using prepared statements and negative
  time/date values": use the same function as the server to convert
  date/time/datetime values to strings.
sql-common/my_time.c:
  Implementation of my_{time,datetime,date,TIME}_to_str: it's
  needed by the client library, so it should be shared.
sql/field.cc:
  Don't create String object if it's not needed.
sql/item.cc:
  Don't create String object if it's not needed: TIME_to_string was
  moved to my_TIME_to_str, with different arguments.
sql/item_timefunc.cc:
  Don't create String object if it's not needed.
sql/mysql_priv.h:
  TIME_to_string and MAX_DATE_REP_LENGTH moved to the client library.
  MAX_DATE_REP_LENGTH was renamed to MAX_DATE_STRING_REP_LENGTH to not 
  conflict with the same name in libmysql.c
sql/protocol.cc:
  Don't create String object if it's not needed.
sql/time.cc:
  Implementation of my_{time,date,datetime,TIME}_to_str moved to my_time.c
  shared between the client and the server.
tests/client_test.c:
  A test case for Bug#6049.

1 files changed, 2 insertions, 22 deletions

diff --git a/libmysql/libmysql.c b/libmysql/libmysql.c
index ef926e2f93d..fe008d24e63 100644
--- a/libmysql/libmysql.c
+++ b/libmysql/libmysql.c
@@ -3556,28 +3556,8 @@ static void fetch_datetime_with_conversion(MYSQL_BIND *param,
       Convert time value  to string and delegate the rest to
       fetch_string_with_conversion:
     */
-    char buff[25];
-    uint length;
-
-    switch (time->time_type) {
-    case MYSQL_TIMESTAMP_DATE:
-      length= my_sprintf(buff,(buff, "%04d-%02d-%02d",
-                               time->year, time->month, time->day));
-      break;
-    case MYSQL_TIMESTAMP_DATETIME:
-      length= my_sprintf(buff,(buff, "%04d-%02d-%02d %02d:%02d:%02d",
-                               time->year, time->month, time->day,
-                               time->hour, time->minute, time->second));
-      break;
-    case MYSQL_TIMESTAMP_TIME:
-      length= my_sprintf(buff, (buff, "%02d:%02d:%02d",
-                                time->hour, time->minute, time->second));
-      break;
-    default:
-      length= 0;
-      buff[0]='\0';
-      break;
-    }
+    char buff[MAX_DATE_STRING_REP_LENGTH];
+    uint length= my_TIME_to_str(time, buff);
     /* Resort to string conversion */
     fetch_string_with_conversion(param, (char *)buff, length);
     break;