crind.c
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上传日期:2007-01-07
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- /*
- * crind.c - create some DB table index
- * Kernel of GNU SQL-server
- *
- * This file is a part of GNU SQL Server
- *
- * Copyright (c) 1996, 1997, Free Software Foundation, Inc
- * Developed at the Institute of System Programming
- * This file is written by Vera Ponomarenko
- *
- * 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.
- *
- * Contacts: gss@ispras.ru
- *
- */
- /* $Id: crind.c,v 1.247 1997/04/15 11:45:41 vera Exp $ */
- #include "xmem.h"
- #include "destrn.h"
- #include "strml.h"
- #include "fdcltrn.h"
- extern i4_t ljmsize;
- extern struct ADBL adlj;
- extern char *pbuflj;
- struct ans_cind
- crind (struct id_rel *pidrel, i4_t prun, i4_t type, i4_t afsize, u2_t *arfn)
- {
- u2_t *a, *b, rcorsize, newsize, disize, fn, dfn;
- char *c, *cort, *nc;
- struct d_r_t *desrel;
- struct d_r_bd *drbd;
- struct des_index *di;
- struct ldesind *desind;
- struct id_rel idr;
- u2_t fnk, corsize, num, sn;
- struct ans_cind ans;
- i4_t n, size;
- struct des_tid tid, ref_tid;
- sn = pidrel->urn.segnum;
- if (sn == NRSNUM)
- {
- ans.cpnci = NDI;
- return (ans);
- }
- if ((ans.cpnci = cont_fir (pidrel, &desrel)) != OK)
- return (ans);
- drbd = &desrel->desrbd;
- fn = drbd->fieldnum;
- if (afsize > fn)
- {
- ans.cpnci = NCF;
- return (ans);
- }
- for (num = 0, a = arfn; num < afsize; num++)
- {
- fnk = *a++;
- if (fnk > fn)
- {
- ans.cpnci = NCF;
- return (ans);
- }
- for (dfn = num + 1; dfn < afsize; dfn++)
- if (fnk == arfn [dfn])
- {
- ans.cpnci = NCF;
- return (ans);
- }
- }
- if ((ans.cpnci = synind (sn, pidrel->urn.obnum)) != OK)
- return (ans);
- tid.tpn = pidrel->pagenum;
- tid.tindex = pidrel->index;
- cort = pbuflj + ljmsize;
- if ((readcort (sn, &tid, cort, &corsize, &ref_tid)) != OK)
- {
- ans.cpnci = NDR;
- return (ans);
- }
- n = uniqnm ();
- dfn = afsize;
- if ((dfn % 2) != 0)
- dfn += 1;
- desind = (struct ldesind *) xmalloc (ldisize + dfn * size2b + rfsize);
- di = (struct des_index *) & desind->ldi;
- di->unindex = n;
- di->kifn = afsize;
- if (prun == PRUN)
- di->kifn |= UNIQ;
- a = (u2_t *) (desind + 1);
- for (b = a + afsize; a < b;)
- *a++ = *arfn++;
- disize = (char *) a - (char *) di;
- rcorsize = getrc (drbd, cort);
- nc = cort + corsize;
- drbd->indnum += 1;
- c = nc;
- size = scscal (cort);
- bcopy (cort, c, size);
- c += size;
- bcopy ((char *) drbd, c, drbdsize);
- c += drbdsize;
- cort += size + drbdsize;
- size = rcorsize - size - drbdsize;
- bcopy (cort, c, size);
- c += size;
- idr = *pidrel;
- if ((ans.cpnci = synlsc (RSC, &idr, NULL, 0, fn, NULL)) != OK)
- return (ans);
- modmes ();
- crtid (desind, desrel);
- crindci (desind);
- dipack (di, disize, c);
- c += disize;
- if ((newsize = c - nc) < corsize)
- newsize = corsize;
- ans.idinci.irii = *pidrel;
- idr.urn.obnum = RDRNUM;
- wmlj (CRILJ, ljmsize + corsize + newsize, &adlj, &idr, &tid, 0);
- ordmod (sn, RDRNUM, &tid, &ref_tid, corsize, nc, newsize);
- fill_ind (desrel, desind);
- ans.idinci.inii = n;
- BUF_endop ();
- return (ans);
- }
- void
- dipack (struct des_index *di, i4_t disize, char *pnt)
- {
- bcopy ((char *) di, pnt, disize);
- }