Bug#37995 Error message truncation in test "innodb" in embedded mode.

   code backported from 6.0


per-file messages:
  include/my_global.h
    Remove SC_MAXWIDTH. This is unused and irrelevant nowadays.
  include/my_sys.h
    Remove errbuf declaration and unused definitions.
  mysys/my_error.c
    Remove errbuf definition and move and adjust ERRMSGSIZE.
  mysys/my_init.c
    Declare buffer on the stack and use my_snprintf.
  mysys/safemalloc.c
    Use size explicitly. It's more than enough for the message at hand.
  sql/sql_error.cc
    Use size explicitly. It's more than enough for the message at hand.
  sql/sql_parse.cc
    Declare buffer on the stack. Use my_snprintf as it will result in
    less stack space being used than by a system provided sprintf --
    this allows us to put the buffer on the stack without causing much
    trouble. Also, the use of errbuff here was not thread-safe as the
    function can be entered concurrently from multiple threads.
  sql/sql_table.cc
    Use MYSQL_ERRMSG_SIZE. Extra space is not needed as my_snprintf will
    nul terminate strings.
  storage/myisam/ha_myisam.cc
Use MYSQL_ERRMSG_SIZE.
  sql/share/errmsg.txt
    Error message truncation in test "innodb" in embedded mode
    filename in the error message can safely take up to 210 symbols.

1 files changed, 2 insertions, 2 deletions

diff --git a/storage/myisam/ha_myisam.cc b/storage/myisam/ha_myisam.cc
index b8d5a9af8d2..4073044bf63 100644
--- a/storage/myisam/ha_myisam.cc
+++ b/storage/myisam/ha_myisam.cc
@@ -1257,7 +1257,7 @@ int ha_myisam::preload_keys(THD* thd, HA_CHECK_OPT *check_opt)
   ulonglong map;
   TABLE_LIST *table_list= table->pos_in_table_list;
   my_bool ignore_leaves= table_list->ignore_leaves;
-  char buf[ERRMSGSIZE+20];
+  char buf[MYSQL_ERRMSG_SIZE];
 
   DBUG_ENTER("ha_myisam::preload_keys");
 
@@ -1285,7 +1285,7 @@ int ha_myisam::preload_keys(THD* thd, HA_CHECK_OPT *check_opt)
       errmsg= "Failed to allocate buffer";
       break;
     default:
-      my_snprintf(buf, ERRMSGSIZE,
+      my_snprintf(buf, sizeof(buf),
                   "Failed to read from index file (errno: %d)", my_errno);
       errmsg= buf;
     }