Index: driver/results.c
===================================================================
--- driver/results.c	(revision 596)
+++ driver/results.c	(working copy)
@@ -532,7 +532,8 @@
 printf( "[PAH][%s][%d][%s] type=%d\n", __FILE__, __LINE__, __FUNCTION__, type );
 */
     if ( pnColumnSize )
-        *pnColumnSize = precision;
+       *pnColumnSize= (stmt->dbc->ado_flag && (precision > 2147483647L) ?
+                      2147483647L : precision);
     if ( pfSqlType )
         *pfSqlType= type;
     if ( pibScale )
Index: driver/myodbc3.h
===================================================================
--- driver/myodbc3.h	(revision 596)
+++ driver/myodbc3.h	(working copy)
@@ -224,8 +224,7 @@
   pthread_mutex_t lock;
 #endif
 #if defined(_WIN32) || defined(WIN32)
-  /* old buffer to store memory pointer allocated previously in another heap */
-  char      *oldbuf;
+  bool          ado_flag;
 #endif
 } DBC;
 
Index: driver/connect.c
===================================================================
--- driver/connect.c	(revision 596)
+++ driver/connect.c	(working copy)
@@ -113,6 +113,11 @@
         {
         }
     }
+    /* ADO is not loaded by default */
+    dbc->ado_flag= 0;
+#ifdef WIN32
+    dbc->ado_flag= (GetModuleHandle("msado15.dll") != NULL);
+#endif
     return error;
 }
 
Index: test/my_result.c
===================================================================
--- test/my_result.c	(revision 596)
+++ test/my_result.c	(working copy)
@@ -1819,7 +1819,78 @@
   return OK;
 }
 
+/**
+Bug #13776: Invalid string or buffer length error
+*/
+DECLARE_TEST(t_bug13776)
+{
+#ifdef WIN32
+  /* Save the old handlers */
+  SQLHENV  old_henv= henv;
+  SQLHDBC  old_hdbc= hdbc;
+  SQLHSTMT old_hstmt= hstmt;
+  HMODULE  ado_dll;
 
+  SQLULEN     pcColSz;
+  SQLCHAR     szColName[MAX_NAME_LEN];
+  SQLCHAR     szData[MAX_ROW_DATA_LEN+1];
+  SQLSMALLINT pfSqlType, pcbScale, pfNullable;
+  SQLCHAR     *env_path= NULL;
+  SQLCHAR     szFileToLoad[255];
+
+  /*
+  TODO: get the full path to the library using getenv
+  */
+  env_path= getenv("CommonProgramFiles(x86)");
+  if (!env_path)
+    env_path= getenv("CommonProgramFiles");
+
+  if (!env_path)
+  {
+    printf("# No path for CommonProgramFiles in %s on line %d\n", \
+           __FILE__, __LINE__); \
+    return FAIL; \
+  }
+  
+  sprintf(szFileToLoad, "%s\\System\\ado\\msado15.dll", env_path);
+
+  ado_dll= LoadLibrary(szFileToLoad);
+  if (!ado_dll)
+  {
+    printf("# Could load MSADO15.DLL in %s on line %d\n", \
+           __FILE__, __LINE__); \
+    return FAIL; \
+  }
+
+  /* Establish the new connection */
+  alloc_basic_handles(&henv, &hdbc, &hstmt);
+
+  ok_sql(hstmt, "DROP TABLE IF EXISTS t_bug13776");
+  ok_sql(hstmt, "CREATE TABLE t_bug13776(ltext LONGTEXT)");
+  ok_sql(hstmt, "INSERT INTO t_bug13776 VALUES ('long text test')");
+  ok_sql(hstmt, "SELECT * FROM t_bug13776");
+  ok_stmt(hstmt, SQLDescribeCol(hstmt, 1, szColName, MAX_NAME_LEN+1, NULL,
+                               &pfSqlType, &pcColSz, &pcbScale, &pfNullable));
+
+  /* 
+  IF adodb15.dll is loaded SQLDescribeCol should return the length of 
+  LONGTEXT columns as 2G instead of 4G
+  */
+  is(pcColSz == 2147483647);
+
+  free_basic_handles(&henv, &hdbc, &hstmt);
+
+  /* Restore the old handlers */
+  henv= old_henv;
+  hdbc= old_hdbc;
+  hstmt= old_hstmt;
+#endif
+  
+ /* 4G LONGTEXT has already been checked by t_desc_col test */
+  return OK;
+}
+
 BEGIN_TESTS
   ADD_TEST(my_resultset)
   ADD_TEST(t_convert_type)
@@ -1841,6 +1912,7 @@
   ADD_TEST(t_bug27544)
   ADD_TEST(t_bug16817)
   ADD_TEST(bug6157)
+  ADD_TEST(t_bug13776)
 END_TESTS