1 files changed, 63 insertions, 0 deletions
diff --git a/isam/rprev.c b/isam/rprev.c
new file mode 100644
index 00000000000..18b1e31502c
--- /dev/null
+++ b/isam/rprev.c
@@ -0,0 +1,63 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   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; either version 2 of the License, or
+   (at your option) any later version.
+   
+   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+/* L{ser f|reg}ende post med samma isam-nyckel */
+
+#include "isamdef.h"
+
+	/*
+	   L{ser f|reg}ende post med samma isamnyckel som f|reg}ende l{sning.
+	   Man kan ha gjort write, update eller delete p} f|reg}ende post.
+	   OBS! [ven om man {ndrade isamnyckeln p} f|reg}ende post l{ses
+	   posten i avseende p} f|reg}ende isam-nyckel-l{sning !!
+	*/
+
+int nisam_rprev(N_INFO *info, byte *buf, int inx)
+{
+  int error;
+  register uint flag;
+  DBUG_ENTER("nisam_rprev");
+
+  if ((inx = _nisam_check_index(info,inx)) < 0)
+    DBUG_RETURN(-1);
+  flag=SEARCH_SMALLER;				/* Read previous */
+  if (info->lastpos == NI_POS_ERROR && info->update & HA_STATE_NEXT_FOUND)
+    flag=0;					/* Read last */
+
+#ifndef NO_LOCKING
+  if (_nisam_readinfo(info,F_RDLCK,1)) DBUG_RETURN(-1);
+#endif
+  if (!flag)
+    error=_nisam_search_last(info,info->s->keyinfo+inx,info->s->state.key_root[inx]);
+  else if (_nisam_test_if_changed(info) == 0)
+    error=_nisam_search_next(info,info->s->keyinfo+inx,info->lastkey,flag,
+			  info->s->state.key_root[inx]);
+  else
+    error=_nisam_search(info,info->s->keyinfo+inx,info->lastkey,0,flag,
+		     info->s->state.key_root[inx]);
+
+  info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED |
+		  HA_STATE_BUFF_SAVED);
+  info->update|= HA_STATE_PREV_FOUND;
+  if (error && my_errno == HA_ERR_KEY_NOT_FOUND)
+    my_errno=HA_ERR_END_OF_FILE;
+  if ((*info->read_record)(info,info->lastpos,buf) >=0)
+  {
+    info->update|= HA_STATE_AKTIV;		/* Record is read */
+    DBUG_RETURN(0);
+  }
+  DBUG_RETURN(-1);
+} /* nisam_rprev */