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Annotation of 43BSD/ingres/source/iutil/create_btree.c, revision 1.1.1.1

1.1       root        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: }

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