1 files changed, 83 insertions, 0 deletions
diff --git a/mysys/mf_cache.c b/mysys/mf_cache.c
new file mode 100644
index 00000000000..c40cfa386d3
--- /dev/null
+++ b/mysys/mf_cache.c
@@ -0,0 +1,83 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA */
+
+/* Open a temporary file and cache it with io_cache. Delete it on close */
+
+#include "mysys_priv.h"
+
+	/*
+	** Open a cached tempfile 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
+	*/
+
+my_bool open_cached_file(IO_CACHE *cache, const char* dir, const char *prefix,
+			  uint cache_size, myf cache_myflags)
+{
+  DBUG_ENTER("open_cached_file");
+
+  cache->buffer=0;				/* Mark that not open */
+  if (!(cache->file_name=my_tempnam(dir,prefix,MYF(MY_WME))))
+    DBUG_RETURN(1);
+  if (!init_io_cache(cache,-1,cache_size,WRITE_CACHE,0L,0,
+		     MYF(cache_myflags | MY_NABP)))
+  {
+    DBUG_RETURN(0);
+  }
+  (*free)(cache->file_name);			/* my_tempnam uses malloc() */
+  cache->file_name=0;
+  DBUG_RETURN(0);
+}
+
+
+my_bool real_open_cached_file(IO_CACHE *cache)
+{
+  DBUG_ENTER("real_open_cached_file");
+  if ((cache->file=my_create(cache->file_name,0,
+			     (int) (O_RDWR | O_BINARY | O_TRUNC | O_TEMPORARY |
+				    O_SHORT_LIVED),
+			     MYF(MY_WME))) >= 0)
+  {
+#if O_TEMPORARY == 0 && !defined(CANT_DELETE_OPEN_FILES)
+    VOID(my_delete(cache->file_name,MYF(MY_WME | ME_NOINPUT)));
+#endif
+    DBUG_RETURN(0);
+  }
+  DBUG_RETURN(1);
+}
+
+
+void close_cached_file(IO_CACHE *cache)
+{
+  DBUG_ENTER("close_cached_file");
+
+  if (my_b_inited(cache))
+  {
+    VOID(end_io_cache(cache));
+    if (cache->file >= 0)
+    {
+      VOID(my_close(cache->file,MYF(MY_WME)));
+#ifdef CANT_DELETE_OPEN_FILES
+      VOID(my_delete(cache->file_name,MYF(MY_WME | ME_NOINPUT)));
+#endif
+    }
+    if (cache->file_name)
+      (*free)(cache->file_name);		/* my_tempnam uses malloc() */
+  }
+  DBUG_VOID_RETURN;
+}