4.3BSD - /usr/ingres/source/iutil/create_btree.c

   1: #include    <btree.h>
   2: #include    <ingres.h>
   3: #include    <aux.h>
   4: #include    <sccs.h>
   5: 
   6: SCCSID(@(#)create_btree.c	8.2	1/18/85)
   7: 
   8: /*	CREATE_BTREE -- creates a new B-Tree
   9: **
  10: **	Creates an empty B-Tree whose root is an empty leaf.  The B-Tree
  11: ** 	filename is the relation name with "TREE" concatenated to the end
  12: **	of the name.
  13: **
  14: **	Parameters:
  15: **		relname - relation name (I)
  16: */
  17: 
  18: create_btree(relname)
  19: char *relname;
  20: 
  21: {
  22:     struct BTreeNode    root;
  23:     register int        i;
  24:     extern int      Btree_fd;
  25: 
  26:     root.depth = 1;
  27:     root.prevtree = root.nexttree = 0l;
  28:     bmove(&root.prevtree, &root.prttree, LIDSIZE);
  29:     /* the root is initially an empty leaf node */
  30:     root.nodetype = 'L';
  31:     root.nelmts = 0;
  32:     root.parent = 0;    /* '0' indicates no other empty pages in file */
  33: 
  34:     root.node.leafnode.prevleaf = 0;
  35:     root.node.leafnode.nextleaf = 0;
  36: 
  37:     for (i = 0; i< MAXLEAVES; ++i)
  38:         root.node.leafnode.tid_loc[i] = root.node.leafnode.back_ptr[i] = i;
  39: 
  40:     close(creat(relname, FILEMODE));
  41:     if ((Btree_fd = open(relname, O_RDWR)) < 0)
  42:         syserr("create_btree: can't open %s", relname);
  43:     write_node(RT, &root);
  44: 
  45: #	ifdef xATR1
  46:     if (tTf(24, 0))
  47:         printf("creating btree %s", relname);
  48: #	endif
  49: 
  50: }

Defined functions