fix resetting cursor data if dba_firstkey failed

better symbol check

fix config.m4

Author: weltling

ext/dba/config.m4

@@ -245,7 +245,7 @@ if test "$PHP_LMDB" != "no"; then
 
   if test -n "$THIS_INCLUDE"; then
 	for LIB in lmdb; do
-	  PHP_CHECK_LIBRARY($LIB, mdb_open, [
+	  PHP_CHECK_LIBRARY($LIB, mdb_env_open, [
 		AC_DEFINE_UNQUOTED(LMDB_INCLUDE_FILE, "$THIS_INCLUDE", [ ])
 		AC_DEFINE(DBA_LMDB, 1, [ ])
 		THIS_LIBS=$LIB
@@ -663,7 +663,7 @@ if test "$HAVE_DBA" = "1"; then
     AC_MSG_RESULT([yes])
   fi
   AC_DEFINE(HAVE_DBA, 1, [ ])
-  PHP_NEW_EXTENSION(dba, dba.c dba_cdb.c dba_dbm.c dba_gdbm.c dba_ndbm.c dba_db1.c dba_db2.c dba_db3.c dba_db4.c dba_flatfile.c dba_inifile.c dba_qdbm.c dba_tcadb.c $cdb_sources $flat_sources $ini_sources, $ext_shared)
+  PHP_NEW_EXTENSION(dba, dba.c dba_cdb.c dba_dbm.c dba_gdbm.c dba_ndbm.c dba_db1.c dba_db2.c dba_db3.c dba_db4.c dba_flatfile.c dba_inifile.c dba_qdbm.c dba_tcadb.c dba_lmdb.c $cdb_sources $flat_sources $ini_sources, $ext_shared)
   PHP_ADD_BUILD_DIR($ext_builddir/libinifile)
   PHP_ADD_BUILD_DIR($ext_builddir/libcdb)
   PHP_ADD_BUILD_DIR($ext_builddir/libflatfile)

ext/dba/dba_lmdb.c

@@ -269,6 +269,7 @@ DBA_FIRSTKEY_FUNC(lmdb)
 	if (rc) {
 		mdb_txn_abort(LMDB_IT(txn));
 		mdb_cursor_close(LMDB_IT(cur));
+		LMDB_IT(cur) = NULL;
 		if (MDB_NOTFOUND != rc) {
 			php_error_docref0(NULL, E_WARNING, "%s", mdb_strerror(rc));
 		}