1 files changed, 92 insertions, 0 deletions
diff --git a/mysys/mf_cache.c b/mysys/mf_cache.c
new file mode 100644
index 00000000..2fec59f4
--- /dev/null
+++ b/mysys/mf_cache.c
@@ -0,0 +1,92 @@
+/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/* Open a temporary file and cache it with io_cache. Delete it on close */
+
+#include "mysys_priv.h"
+#include <m_string.h>
+#include "my_static.h"
+#include "mysys_err.h"
+
+/**
+  Open tempfile cached by IO_CACHE
+
+  Should be used when no seeks are done (only reinit_io_buff)
+  Return 0 if cache is inited ok
+  The actual file is created when the IO_CACHE buffer gets filled
+  If dir is not given, use TMPDIR.
+*/
+my_bool open_cached_file(IO_CACHE *cache, const char* dir, const char *prefix,
+                         size_t cache_size, myf cache_myflags)
+{
+  DBUG_ENTER("open_cached_file");
+  cache->dir= dir;
+  if (prefix)
+  {
+    DBUG_ASSERT(strlen(prefix) == 2);
+    memcpy(cache->prefix, prefix, 3);
+  }
+  else
+    cache->prefix[0]= 0;
+  cache->file_name=0;
+  cache->buffer=0;				/* Mark that not open */
+  if (!init_io_cache(cache, -1, cache_size, WRITE_CACHE, 0L, 0,
+		     MYF(cache_myflags | MY_NABP)))
+  {
+    DBUG_RETURN(0);
+  }
+  DBUG_RETURN(1);
+}
+
+/**
+  Create the temporary file
+*/
+my_bool real_open_cached_file(IO_CACHE *cache)
+{
+  char name_buff[FN_REFLEN];
+  int error=1;
+  DBUG_ENTER("real_open_cached_file");
+  if ((cache->file= create_temp_file(name_buff, cache->dir,
+                                    cache->prefix[0] ? cache->prefix : 0,
+                                    O_BINARY, MYF(MY_WME | MY_TEMPORARY))) >= 0)
+  {
+    error=0;
+  }
+  DBUG_RETURN(error);
+}
+
+
+void close_cached_file(IO_CACHE *cache)
+{
+  DBUG_ENTER("close_cached_file");
+  if (my_b_inited(cache))
+  {
+    File file=cache->file;
+    cache->file= -1;				/* Don't flush data */
+    (void) end_io_cache(cache);
+    if (file >= 0)
+    {
+      (void) my_close(file,MYF(0));
+#ifdef CANT_DELETE_OPEN_FILES
+      if (cache->file_name)
+      {
+	(void) my_delete(cache->file_name, MYF(MY_WME));
+	my_free(cache->file_name);
+      }
+#endif
+    }
+  }
+  DBUG_VOID_RETURN;
+}