ING_DB
This commit is contained in:
Oliver Lehmann
parent
93c8577d2c
commit
21431280ae
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# include <stdio.h>
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# include "gen.h"
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# include "../h/dbs.h"
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# include "../h/aux.h"
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# include "../h/symbol.h"
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# include "../h/tree.h"
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# include "../h/pipes.h"
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# include "../h/bs.h"
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# include "qrymod.h"
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extern struct pipfrmt Pipe;
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char *Qmdname[] =
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{
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"[ERROR]", /* 0 = mdRETTERM */
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"RETRIEVE", /* 1 = mdRETR */
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"APPEND", /* 2 = mdAPP */
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"REPLACE", /* 3 = mdREPL */
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"DELETE", /* 4 = mdDEL */
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"", /* 5 = mdCOPY */
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"", /* 6 = mdCREATE */
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"", /* 7 = mdDESTROY */
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"", /* 8 = mdHELP */
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"", /* 9 = mdINDEX */
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"", /* 10 = mdMODIFY */
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"", /* 11 = mdPRINT */
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"", /* 12 = mdRANGE */
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"", /* 13 = mdSAVE */
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"DEFINE", /* 14 = mdDEFINE */
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"RET_UNIQUE", /* 15 = mdRET_UNI */
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"", /* 16 = mdVIEW */
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"", /* 17 = mdUPDATE */
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"", /* 18 = mdRESETREL */
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"", /* 19 = mdERIC */
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"", /* 20 = mdNETQRY */
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"", /* 21 = mdMOVEREL */
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"", /* 22 = mdPROT */
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"", /* 23 = mdINTEG */
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"", /* 24 = mdDCREATE */
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};
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/*
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** UTIL.C -- qrymod support routines
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**
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** This module contains a set of support routines for use
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** by the query modification routines.
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**
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** Defines:
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** trimqlend() -- trim QLEND node off of qualification.
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** appqual() -- append qualification to tree.
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** far_error() -- issue fatal error
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** lsetbit() -- set bit in large set.
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** mergevar() -- merge variables to link terms
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** makezero() -- make a zero node
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**
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**
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**
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** TRIMQLEND -- trim QLEND node off of qualification
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**
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** The QLEND node, and possible the AND node preceeding it,
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** are trimmed off. The result of this routine should be
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** a very ordinary tree like you might see in some textbook.
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**
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** A fast not on the algorithm: the pointer 't' points to the
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** current node (the one which we are checking for a QLEND).
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** 's' points to 't's parent, and 'r' points to 's's parent;
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** 'r' is (QTREE *) 0 at the top of the tree.
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**
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** This routine works correctly on trees with no QLEND in
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** the first place, returning the original tree.
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**
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** If there is a QLEND, it must be on the far right branch
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** of the tree, that is, the tree must be DBS-canonical.
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**
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** Parameters:
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** qual -- the qualification to be trimmed.
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**
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** Returns:
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** A pointer to the new qualification.
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** (QTREE *) 0 if the qualification was null once the
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** QLEND is stripped.
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**
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** Side Effects:
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** The tree pointed to by 'qual' may be modified.
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*/
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QTREE *trimqlend(qual)
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QTREE *qual;
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{
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register QTREE *t;
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register QTREE *s;
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register QTREE *r;
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t = qual;
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/* check for the simple null qualification case */
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if (!t || t->sym.type == QLEND)
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return ((QTREE *) 0);
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/* scan tree for QLEND node */
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for (r = (QTREE *) 0, s = t; t = t->right; r = s, s = t)
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{
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if (t->sym.type == QLEND)
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{
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/* trim of QLEND and AND node */
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if (!r)
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{
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/* only one AND -- return its operand */
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return (s->left);
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}
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r->right = s->left;
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break;
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}
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}
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/* return tree with final AND node and QLEND node pruned */
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return (qual);
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}
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/*
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** APPQUAL -- append qualification to tree
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**
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** The qualification is conjoined to the qualificaion of the
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** tree which is passed.
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**
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** Parameters:
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** qual -- a pointer to the qualification to be appended.
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** root -- a pointer to the tree to be appended to.
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**
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** Side Effects:
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** Both 'qual' ad 'root' may be modified. Note that
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** 'qual' is linked into 'root', and must be
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** retained.
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*/
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appqual(qual, root)
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QTREE *qual;
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QTREE *root;
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{
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register QTREE *p;
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register QTREE *r;
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r = root;
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# ifdef xQTR3
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if (!r)
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AAsyserr(19057);
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# endif
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/*
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** Find node before QLEND node
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** p points the node we are examining, r points to
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** it's parent.
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*/
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while ((p = r->right) != (QTREE *) 0 && p->sym.type != QLEND)
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{
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# ifdef xQTR3
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if (p->sym.type != AND)
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AAsyserr(19058, p->sym.type);
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# endif
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r = p;
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}
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/* link in qualification */
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r->right = qual;
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}
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/*
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** FERROR -- issue fatal error message and abort query
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**
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** This call is almost exactly like 'error' (which is called),
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** but never returns: the return is done by 'reset'. Also, the
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** R_up pipe is flushed.
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**
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** Parameters:
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** errno -- the error number.
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** qmode -- the query mode to pass as $0, -1 if none.
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** vn -- the varno of the relation name to pass as
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** $1, -1 if none.
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** p1 to p5 -- the parameters $2 through $6
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**
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** Returns:
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** non-local (via reset())
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*/
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far_error(errno, qmode, vn, p1, p2, p3, p4, p5, p6)
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int errno;
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int qmode;
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int vn;
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char *p1, *p2, *p3, *p4, *p5, *p6;
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{
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register char *x1;
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register char *x2;
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char xbuf[MAXNAME + 1];
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register int i;
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extern char *trim_relname();
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extern int Nullsync;
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struct retcode *rc;
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extern struct retcode *nullsync();
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/* flush the upward read pipe */
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rdpipe(P_SYNC, &Pipe, R_up);
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/* set up qmode and varno parameters */
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x1 = x2 = "";
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i = qmode;
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if (i >= 0)
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x1 = Qmdname[i];
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i = vn;
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if (i >= 0)
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AAsmove(trim_relname(Rangev[i].relid), x2 = xbuf);
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/* issue the error message */
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error(errno, x1, x2, p1, p2, p3, p4, p5, p6, (char *) 0);
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/* issue null query if running EQL */
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if (Nullsync)
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rc = nullsync();
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else
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rc = (struct retcode *) 0;
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/* sync to above */
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wrpipe(P_PRIME, &Pipe, 0, (char *) 0, 0);
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if (rc)
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wrpipe(P_NORM, &Pipe, W_up, rc, sizeof *rc);
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wrpipe(P_END, &Pipe, W_up);
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/* return to main loop for next query */
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reset();
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}
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/*
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** XERROR -- interface from need() to far_error()
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**
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** Parameters:
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** err -- the error number.
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**
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** Returns:
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** never
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*/
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xerror(err)
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int err;
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{
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far_error(err, -1, -1, (char *) 0);
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}
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/*
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** LSETBIT -- set a bit in a domain set
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**
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** Parameters:
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** bitno -- the bit number to set (0 -> 127)
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** xset -- the set to set it in.
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*/
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lsetbit(bitno, xset)
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register int bitno;
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register short *xset;
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{
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register int n;
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n = bitno >> 4; /* LOG2WORDSIZE */
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bitno &= 017; /* WORDSIZE - 1 */
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xset[n] |= 1 << bitno;
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}
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/*
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** MERGEVAR -- merge variable numbers to link terms
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**
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** One specified variable gets mapped into another, effectively
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** merging those two variables. This is used for protection
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** and integrity, since the constraint read from the tree
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** must coincide with one of the variables in the query tree.
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**
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** Parameters:
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** va -- the variable which will dissappear.
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** vb -- the variable which 'va' gets mapped into.
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** root -- the root of the tree to map.
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**
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** Side Effects:
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** The tree pointed at by 'root' gets VAR and RESDOM
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** nodes mapped.
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** Range table entry for 'va' is deallocated.
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** The 'Remap' vector gets reset and left in an
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** undefined state.
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*/
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mergevar(va, vb, root)
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int va;
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int vb;
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QTREE *root;
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{
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register int a;
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register int b;
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a = va;
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b = vb;
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# ifdef xQTR1
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if (AAtTfp(16, 0, "MERGEVAR: %d->%d", a, b))
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treepr(root, (char *) 0);
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# endif
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/*
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** Insure that 'va' and 'vb' are consistant, that is,
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** that they both are in range, are defined, and range over
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** the same relation.
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*/
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if (a < 0 || b < 0 || a >= MAXVAR + 1 || b >= MAXVAR + 1)
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AAsyserr(19059, a, b);
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if (!Rangev[a].rused || !Rangev[b].rused)
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AAsyserr(19060, a, b);
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if (!AAbequal(Rangev[a].relid, Rangev[b].relid, MAXNAME) ||
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!AAbequal(Rangev[a].rowner, Rangev[b].rowner, 2))
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AAsyserr(19061, Rangev[a].relid, Rangev[b].relid);
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/*
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** To do the actual mapping, we will set up 'Remap' and
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** call 'mapvars()'. This is because I am too lazy to
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** do it myself.
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*/
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clrrange(FALSE);
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Remap[a] = b;
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mapvars(root);
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/* delete a from the range table */
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Rangev[a].rused = FALSE;
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}
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/*
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** MAKEZERO -- make a node with value 'zero'
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**
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** A node is created with value representing the zero value
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** for the specified type, that is, 0 for integers, 0.0 for
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** floats, and the blank string for chars.
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**
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** Parameters:
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** typ -- the node type.
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**
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** Returns:
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** a pointer to the zero node.
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*/
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SYMBOL *makezero(typ)
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int typ;
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{
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register int l;
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register SYMBOL *s;
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char symbuf[SYM_HDR_SIZ + sizeof (double)];
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extern char *need();
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s = (SYMBOL *) symbuf;
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s->type = typ;
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switch (typ)
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{
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case INT:
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s->len = l = sizeof (short);
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s->value[0] = 0;
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break;
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case FLOAT:
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s->len = l = sizeof (double);
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((F8TYPE *) s->value)->f8type = 0.0;
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break;
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case CHAR:
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s->len = l = 2 * sizeof (char);
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s->value[0] = ' ' | (' ' << 8); /* (two spaces) */
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break;
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default:
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AAsyserr(19062, typ);
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}
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/* duplicate the node into Qbuf */
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l += SYM_HDR_SIZ;
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s = (SYMBOL *) need(Qbuf, l);
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AAbmove(symbuf, s, l);
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return (s);
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}
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