4.3BSD - /usr/ingres/source/qrymod/puttree.c

   1: # include   <ingres.h>
   2: # include   <catalog.h>
   3: # include   <symbol.h>
   4: # include   <lock.h>
   5: # include   <tree.h>
   6: # include   "qrymod.h"
   7: # include   <sccs.h>
   8: 
   9: SCCSID(@(#)puttree.c	8.2	1/15/85)
  10: 
  11: /*
  12: **  PUTTREE -- put tree into 'tree' catalog
  13: **
  14: **	The named tree is inserted into the 'tree' catalog.
  15: **
  16: **	The algorithm is to lock up the entire catalog and try to
  17: **	find the smallest unique id possible for the named relation.
  18: **
  19: **	Parameters:
  20: **		root -- the root of the tree to insert.
  21: **		treerelid -- the relid of the relation for which
  22: **			this tree applies.
  23: **		treeowner -- the owner of the above relation.
  24: **		treetype -- the type of this tree; uses the mdXXX
  25: **			type (as mdPROT, mdINTEG, mdDISTR, etc.).
  26: **
  27: **	Returns:
  28: **		The treeid that was assigned to this tree.
  29: **
  30: **	Side Effects:
  31: **		The tree catalog gets locked, and information is
  32: **		inserted.
  33: **
  34: **	Trace Flags:
  35: **		10
  36: */
  37: 
  38: puttree(root, trelid, towner, ttype)
  39: QTREE   *root;
  40: char    *trelid;
  41: char    *towner;
  42: int ttype;
  43: {
  44:     struct tree treekey;
  45:     struct tree treetup;
  46:     struct tup_id   treetid;
  47:     register int    i;
  48:     auto int    treeid;
  49: 
  50:     opencatalog("tree", OR_WRITE);
  51: 
  52:     /*
  53: 	**  Find a unique tree identifier.
  54: 	**	Lock the tree catalog, and scan until we find a
  55: 	**	tuple which does not match.
  56: 	*/
  57: 
  58:     setrll(A_SLP, Treedes.reltid.ltid, M_EXCL);
  59: 
  60:     setkey(&Treedes, &treekey, trelid, TREERELID);
  61:     setkey(&Treedes, &treekey, towner, TREEOWNER);
  62:     setkey(&Treedes, &treekey, &ttype, TREETYPE);
  63:     for (treeid = 0;; treeid++)
  64:     {
  65:         setkey(&Treedes, &treekey, &treeid, TREEID);
  66:         i = getequal(&Treedes, &treekey, &treetup, &treetid);
  67:         if (i < 0)
  68:             syserr("d_tree: getequal");
  69:         else if (i > 0)
  70:             break;
  71:     }
  72: 
  73:     /*
  74: 	**  We have a unique tree id.
  75: 	**	Insert the new tuple and the tree into the
  76: 	**	tree catalog.
  77: 	*/
  78: 
  79:     relntrwr(NULL, 0, trelid, towner, ttype, treeid);
  80:     writeqry(root, relntrwr, 0);
  81:     relntrwr(NULL, 1);
  82: 
  83:     /* all inserted -- flush pages and unlock */
  84:     if (noclose(&Treedes) != 0)
  85:         syserr("d_tree: noclose");
  86:     unlrl(Treedes.reltid.ltid);
  87: 
  88:     return(treeid);
  89: }
  90: /*
  91: **  RELNTRWR -- physical tree write to relation
  92: **
  93: **	This is the routine called from writeqry to write trees
  94: **	to the 'tree' relation (rather than the W_down pipe).
  95: **
  96: **	It is assumed that the (treerelid, treeowner, treetype,
  97: **	treeid) combination is unique in the tree catalog, and that
  98: **	the tree catalog is locked.
  99: **
 100: **	Parameters:
 101: **		ptr -- a pointer to the data.  If NULL, this is
 102: **			a control call.
 103: **		len -- the length of the data.  If ptr == NULL, this
 104: **			field is a control code:  zero means
 105: **			initialize (thus taking the next two param-
 106: **			eters); one means flush.
 107: **		treerelid -- the name of the relation for which this
 108: **			tree applies (init only).
 109: **		treeowner -- the owner of this relation (init only).
 110: **		treetype -- on initialization, this tells what the
 111: **			tree is used for.
 112: **		treeid -- on initialization, this is the tree id we
 113: **			want to use.
 114: **
 115: **	Returns:
 116: **		The number of bytes written ('len').
 117: **
 118: **	Side Effects:
 119: **		Well, yes.  Activity occurs in the tree catalog.
 120: **
 121: **	Trace Flags:
 122: **		none
 123: */
 124: 
 125: relntrwr(ptr, len, treerelid, treeowner, treetype, treeid)
 126: char    *ptr;
 127: int len;
 128: char    *treerelid;
 129: char    *treeowner;
 130: int treetype;
 131: int treeid;
 132: {
 133:     static struct tree  treetup;
 134:     struct tup_id       treetid;
 135:     register char       *p;
 136:     register int        l;
 137:     static char     *tptr;
 138: 
 139:     p = ptr;
 140:     l = len;
 141: 
 142:     /* check for special function */
 143:     if (p == NULL)
 144:     {
 145:         switch (l)
 146:         {
 147:           case 0:
 148:             clr_tuple(&Treedes, &treetup);
 149:             bmove(treerelid, treetup.treerelid, MAXNAME);
 150:             bmove(treeowner, treetup.treeowner, 2);
 151:             treetup.treetype = treetype;
 152:             treetup.treeid = treeid;
 153:             tptr = treetup.treetree;
 154:             break;
 155: 
 156:           case 1:
 157:             if (tptr != treetup.treetree)
 158:             {
 159:                 if (insert(&Treedes, &treetid, &treetup, FALSE) < 0)
 160:                     syserr("relntrwr: insert 1");
 161:             }
 162:             break;
 163: 
 164:           default:
 165:             syserr("relntrwr: ctl %d", l);
 166:         }
 167:         return;
 168:     }
 169: 
 170:     /* output bytes */
 171:     while (l-- > 0)
 172:     {
 173:         *tptr++ = *p++;
 174: 
 175:         /* check for buffer overflow */
 176:         if (tptr < &treetup.treetree[sizeof treetup.treetree])
 177:             continue;
 178: 
 179:         /* yep, flush buffer to relation */
 180:         if (insert(&Treedes, &treetid, &treetup, FALSE) < 0)
 181:             syserr("relntrwr: insert 2");
 182:         treetup.treeseq++;
 183:         tptr = treetup.treetree;
 184: 
 185:         /* clear out the rest of the tuple for aesthetic reasons */
 186:         *tptr = ' ';
 187:         bmove(tptr, tptr + 1, sizeof treetup.treetree - 1);
 188:     }
 189: 
 190:     return (len);
 191: }

Defined functions