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villa.c
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/*************************************************************************************************
* Implementation of Villa
* Copyright (C) 2000-2007 Mikio Hirabayashi
* This file is part of QDBM, Quick Database Manager.
* QDBM is free software; you can redistribute it and/or modify it under the terms of the GNU
* Lesser General Public License as published by the Free Software Foundation; either version
* 2.1 of the License or any later version. QDBM 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 Lesser General Public License for more
* details.
* You should have received a copy of the GNU Lesser General Public License along with QDBM; if
* not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA.
*************************************************************************************************/
#define QDBM_INTERNAL 1
#include "villa.h"
#include "myconf.h"
#define VL_LEAFIDMIN 1 /* minimum number of leaf ID */
#define VL_NODEIDMIN 100000000 /* minimum number of node ID */
#define VL_VNUMBUFSIZ 8 /* size of a buffer for variable length number */
#define VL_NUMBUFSIZ 32 /* size of a buffer for a number */
#define VL_PAGEBUFSIZ 32768 /* size of a buffer to read each page */
#define VL_MAXLEAFSIZ 49152 /* maximum size of each leaf */
#define VL_DEFLRECMAX 49 /* default number of records in each leaf */
#define VL_DEFNIDXMAX 192 /* default number of indexes in each node */
#define VL_DEFLCNUM 1024 /* default number of leaf cache */
#define VL_DEFNCNUM 512 /* default number of node cache */
#define VL_CACHEOUT 8 /* number of pages in a process of cacheout */
#define VL_INITBNUM 32749 /* initial bucket number */
#define VL_PAGEALIGN -3 /* alignment for pages */
#define VL_FBPOOLSIZ 128 /* size of free block pool */
#define VL_PATHBUFSIZ 1024 /* size of a path buffer */
#define VL_TMPFSUF MYEXTSTR "vltmp" /* suffix of a temporary file */
#define VL_ROOTKEY -1 /* key of the root key */
#define VL_LASTKEY -2 /* key of the last key */
#define VL_LNUMKEY -3 /* key of the number of leaves */
#define VL_NNUMKEY -4 /* key of the number of nodes */
#define VL_RNUMKEY -5 /* key of the number of records */
#define VL_CRDNUM 7 /* default division number for Vista */
/* set a buffer for a variable length number */
#define VL_SETVNUMBUF(VL_len, VL_buf, VL_num) \
do { \
int _VL_num; \
_VL_num = VL_num; \
if(_VL_num == 0){ \
((signed char *)(VL_buf))[0] = 0; \
(VL_len) = 1; \
} else { \
(VL_len) = 0; \
while(_VL_num > 0){ \
int _VL_rem = _VL_num & 0x7f; \
_VL_num >>= 7; \
if(_VL_num > 0){ \
((signed char *)(VL_buf))[(VL_len)] = -_VL_rem - 1; \
} else { \
((signed char *)(VL_buf))[(VL_len)] = _VL_rem; \
} \
(VL_len)++; \
} \
} \
} while(FALSE)
/* read a variable length buffer */
#define VL_READVNUMBUF(VL_buf, VL_size, VL_num, VL_step) \
do { \
int _VL_i, _VL_base; \
(VL_num) = 0; \
_VL_base = 1; \
if((VL_size) < 2){ \
(VL_num) = ((signed char *)(VL_buf))[0]; \
(VL_step) = 1; \
} else { \
for(_VL_i = 0; _VL_i < (VL_size); _VL_i++){ \
if(((signed char *)(VL_buf))[_VL_i] >= 0){ \
(VL_num) += ((signed char *)(VL_buf))[_VL_i] * _VL_base; \
break; \
} \
(VL_num) += _VL_base * (((signed char *)(VL_buf))[_VL_i] + 1) * -1; \
_VL_base *= 128; \
} \
(VL_step) = _VL_i + 1; \
} \
} while(FALSE)
enum { /* enumeration for flags */
VL_FLISVILLA = 1 << 0, /* whether for Villa */
VL_FLISZLIB = 1 << 1, /* whether with ZLIB */
VL_FLISLZO = 1 << 2, /* whether with LZO */
VL_FLISBZIP = 1 << 3 /* whether with BZIP2 */
};
/* private function prototypes */
static int vllexcompare(const char *aptr, int asiz, const char *bptr, int bsiz);
static int vlintcompare(const char *aptr, int asiz, const char *bptr, int bsiz);
static int vlnumcompare(const char *aptr, int asiz, const char *bptr, int bsiz);
static int vldeccompare(const char *aptr, int asiz, const char *bptr, int bsiz);
static int vldpputnum(DEPOT *depot, int knum, int vnum);
static int vldpgetnum(DEPOT *depot, int knum, int *vnp);
static VLLEAF *vlleafnew(VILLA *villa, int prev, int next);
static int vlleafcacheout(VILLA *villa, int id);
static int vlleafsave(VILLA *villa, VLLEAF *leaf);
static VLLEAF *vlleafload(VILLA *villa, int id);
static VLLEAF *vlgethistleaf(VILLA *villa, const char *kbuf, int ksiz);
static int vlleafaddrec(VILLA *villa, VLLEAF *leaf, int dmode,
const char *kbuf, int ksiz, const char *vbuf, int vsiz);
static int vlleafdatasize(VLLEAF *leaf);
static VLLEAF *vlleafdivide(VILLA *villa, VLLEAF *leaf);
static VLNODE *vlnodenew(VILLA *villa, int heir);
static int vlnodecacheout(VILLA *villa, int id);
static int vlnodesave(VILLA *villa, VLNODE *node);
static VLNODE *vlnodeload(VILLA *villa, int id);
static void vlnodeaddidx(VILLA *villa, VLNODE *node, int order,
int pid, const char *kbuf, int ksiz);
static int vlsearchleaf(VILLA *villa, const char *kbuf, int ksiz);
static int vlcacheadjust(VILLA *villa);
static VLREC *vlrecsearch(VILLA *villa, VLLEAF *leaf, const char *kbuf, int ksiz, int *ip);
/*************************************************************************************************
* public objects
*************************************************************************************************/
/* Comparing functions. */
VLCFUNC VL_CMPLEX = vllexcompare;
VLCFUNC VL_CMPINT = vlintcompare;
VLCFUNC VL_CMPNUM = vlnumcompare;
VLCFUNC VL_CMPDEC = vldeccompare;
/* Get a database handle. */
VILLA *vlopen(const char *name, int omode, VLCFUNC cmp){
DEPOT *depot;
int dpomode, flags, cmode, root, last, lnum, nnum, rnum;
VILLA *villa;
VLLEAF *leaf;
assert(name && cmp);
dpomode = DP_OREADER;
if(omode & VL_OWRITER){
dpomode = DP_OWRITER;
if(omode & VL_OCREAT) dpomode |= DP_OCREAT;
if(omode & VL_OTRUNC) dpomode |= DP_OTRUNC;
}
if(omode & VL_ONOLCK) dpomode |= DP_ONOLCK;
if(omode & VL_OLCKNB) dpomode |= DP_OLCKNB;
if(!(depot = dpopen(name, dpomode, VL_INITBNUM))) return NULL;
flags = dpgetflags(depot);
cmode = 0;
root = -1;
last = -1;
lnum = 0;
nnum = 0;
rnum = 0;
if(dprnum(depot) > 0){
if(!(flags & VL_FLISVILLA) ||
!vldpgetnum(depot, VL_ROOTKEY, &root) || !vldpgetnum(depot, VL_LASTKEY, &last) ||
!vldpgetnum(depot, VL_LNUMKEY, &lnum) || !vldpgetnum(depot, VL_NNUMKEY, &nnum) ||
!vldpgetnum(depot, VL_RNUMKEY, &rnum) || root < VL_LEAFIDMIN || last < VL_LEAFIDMIN ||
lnum < 0 || nnum < 0 || rnum < 0){
dpclose(depot);
dpecodeset(DP_EBROKEN, __FILE__, __LINE__);
return NULL;
}
if(flags & VL_FLISZLIB){
cmode = VL_OZCOMP;
} else if(flags & VL_FLISLZO){
cmode = VL_OYCOMP;
} else if(flags & VL_FLISBZIP){
cmode = VL_OXCOMP;
}
} else if(omode & VL_OWRITER){
if(omode & VL_OZCOMP){
cmode = VL_OZCOMP;
} else if(omode & VL_OYCOMP){
cmode = VL_OYCOMP;
} else if(omode & VL_OXCOMP){
cmode = VL_OXCOMP;
}
}
if(omode & VL_OWRITER){
flags |= VL_FLISVILLA;
if(_qdbm_deflate && cmode == VL_OZCOMP){
flags |= VL_FLISZLIB;
} else if(_qdbm_lzoencode && cmode == VL_OYCOMP){
flags |= VL_FLISLZO;
} else if(_qdbm_bzencode && cmode == VL_OXCOMP){
flags |= VL_FLISBZIP;
}
if(!dpsetflags(depot, flags) || !dpsetalign(depot, VL_PAGEALIGN) ||
!dpsetfbpsiz(depot, VL_FBPOOLSIZ)){
dpclose(depot);
return NULL;
}
}
CB_MALLOC(villa, sizeof(VILLA));
villa->depot = depot;
villa->cmp = cmp;
villa->wmode = (omode & VL_OWRITER);
villa->cmode = cmode;
villa->root = root;
villa->last = last;
villa->lnum = lnum;
villa->nnum = nnum;
villa->rnum = rnum;
villa->leafc = cbmapopen();
villa->nodec = cbmapopen();
villa->hnum = 0;
villa->hleaf = -1;
villa->lleaf = -1;
villa->curleaf = -1;
villa->curknum = -1;
villa->curvnum = -1;
villa->leafrecmax = VL_DEFLRECMAX;
villa->nodeidxmax = VL_DEFNIDXMAX;
villa->leafcnum = VL_DEFLCNUM;
villa->nodecnum = VL_DEFNCNUM;
villa->tran = FALSE;
villa->rbroot = -1;
villa->rblast = -1;
villa->rblnum = -1;
villa->rbnnum = -1;
villa->rbrnum = -1;
if(root == -1){
leaf = vlleafnew(villa, -1, -1);
villa->root = leaf->id;
villa->last = leaf->id;
if(!vltranbegin(villa) || !vltranabort(villa)){
vlclose(villa);
return NULL;
}
}
return villa;
}
/* Close a database handle. */
int vlclose(VILLA *villa){
int err, pid;
const char *tmp;
assert(villa);
err = FALSE;
if(villa->tran){
if(!vltranabort(villa)) err = TRUE;
}
cbmapiterinit(villa->leafc);
while((tmp = cbmapiternext(villa->leafc, NULL)) != NULL){
pid = *(int *)tmp;
if(!vlleafcacheout(villa, pid)) err = TRUE;
}
cbmapiterinit(villa->nodec);
while((tmp = cbmapiternext(villa->nodec, NULL)) != NULL){
pid = *(int *)tmp;
if(!vlnodecacheout(villa, pid)) err = TRUE;
}
if(villa->wmode){
if(!dpsetalign(villa->depot, 0)) err = TRUE;
if(!vldpputnum(villa->depot, VL_ROOTKEY, villa->root)) err = TRUE;
if(!vldpputnum(villa->depot, VL_LASTKEY, villa->last)) err = TRUE;
if(!vldpputnum(villa->depot, VL_LNUMKEY, villa->lnum)) err = TRUE;
if(!vldpputnum(villa->depot, VL_NNUMKEY, villa->nnum)) err = TRUE;
if(!vldpputnum(villa->depot, VL_RNUMKEY, villa->rnum)) err = TRUE;
}
cbmapclose(villa->leafc);
cbmapclose(villa->nodec);
if(!dpclose(villa->depot)) err = TRUE;
free(villa);
return err ? FALSE : TRUE;
}
/* Store a record. */
int vlput(VILLA *villa, const char *kbuf, int ksiz, const char *vbuf, int vsiz, int dmode){
VLLEAF *leaf, *newleaf;
VLNODE *node, *newnode;
VLIDX *idxp;
CBDATUM *key;
int i, pid, todiv, heir, parent, mid;
assert(villa && kbuf && vbuf);
villa->curleaf = -1;
villa->curknum = -1;
villa->curvnum = -1;
if(!villa->wmode){
dpecodeset(DP_EMODE, __FILE__, __LINE__);
return FALSE;
}
if(ksiz < 0) ksiz = strlen(kbuf);
if(vsiz < 0) vsiz = strlen(vbuf);
if(villa->hleaf < VL_LEAFIDMIN || !(leaf = vlgethistleaf(villa, kbuf, ksiz))){
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1) return FALSE;
if(!(leaf = vlleafload(villa, pid))) return FALSE;
}
if(!vlleafaddrec(villa, leaf, dmode, kbuf, ksiz, vbuf, vsiz)){
dpecodeset(DP_EKEEP, __FILE__, __LINE__);
return FALSE;
}
todiv = FALSE;
switch(CB_LISTNUM(leaf->recs) % 4){
case 0:
if(CB_LISTNUM(leaf->recs) >= 4 &&
vlleafdatasize(leaf) > VL_MAXLEAFSIZ * (villa->cmode > 0 ? 2 : 1)){
todiv = TRUE;
break;
}
case 2:
if(CB_LISTNUM(leaf->recs) > villa->leafrecmax) todiv = TRUE;
break;
}
if(todiv){
if(!(newleaf = vlleafdivide(villa, leaf))) return FALSE;
if(leaf->id == villa->last) villa->last = newleaf->id;
heir = leaf->id;
pid = newleaf->id;
key = ((VLREC *)CB_LISTVAL(newleaf->recs, 0))->key;
key = cbdatumdup(key);
while(TRUE){
if(villa->hnum < 1){
node = vlnodenew(villa, heir);
vlnodeaddidx(villa, node, TRUE, pid, CB_DATUMPTR(key), CB_DATUMSIZE(key));
villa->root = node->id;
CB_DATUMCLOSE(key);
break;
}
parent = villa->hist[--villa->hnum];
if(!(node = vlnodeload(villa, parent))){
CB_DATUMCLOSE(key);
return FALSE;
}
vlnodeaddidx(villa, node, FALSE, pid, CB_DATUMPTR(key), CB_DATUMSIZE(key));
CB_DATUMCLOSE(key);
if(CB_LISTNUM(node->idxs) <= villa->nodeidxmax || CB_LISTNUM(node->idxs) % 2 == 0) break;
mid = CB_LISTNUM(node->idxs) / 2;
idxp = (VLIDX *)CB_LISTVAL(node->idxs, mid);
newnode = vlnodenew(villa, idxp->pid);
heir = node->id;
pid = newnode->id;
CB_DATUMOPEN2(key, CB_DATUMPTR(idxp->key), CB_DATUMSIZE(idxp->key));
for(i = mid + 1; i < CB_LISTNUM(node->idxs); i++){
idxp = (VLIDX *)CB_LISTVAL(node->idxs, i);
vlnodeaddidx(villa, newnode, TRUE, idxp->pid,
CB_DATUMPTR(idxp->key), CB_DATUMSIZE(idxp->key));
}
for(i = 0; i <= mid; i++){
idxp = (VLIDX *)cblistpop(node->idxs, NULL);
CB_DATUMCLOSE(idxp->key);
free(idxp);
}
node->dirty = TRUE;
}
}
if(!villa->tran && !vlcacheadjust(villa)) return FALSE;
return TRUE;
}
/* Delete a record. */
int vlout(VILLA *villa, const char *kbuf, int ksiz){
VLLEAF *leaf;
VLREC *recp;
int pid, ri, vsiz;
char *vbuf;
assert(villa && kbuf);
villa->curleaf = -1;
villa->curknum = -1;
villa->curvnum = -1;
if(!villa->wmode){
dpecodeset(DP_EMODE, __FILE__, __LINE__);
return FALSE;
}
if(ksiz < 0) ksiz = strlen(kbuf);
if(villa->hleaf < VL_LEAFIDMIN || !(leaf = vlgethistleaf(villa, kbuf, ksiz))){
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1) return FALSE;
if(!(leaf = vlleafload(villa, pid))) return FALSE;
}
if(!(recp = vlrecsearch(villa, leaf, kbuf, ksiz, &ri))){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(recp->rest){
CB_DATUMCLOSE(recp->first);
vbuf = cblistshift(recp->rest, &vsiz);
CB_DATUMOPEN2(recp->first, vbuf, vsiz);
free(vbuf);
if(CB_LISTNUM(recp->rest) < 1){
CB_LISTCLOSE(recp->rest);
recp->rest = NULL;
}
} else {
CB_DATUMCLOSE(recp->key);
CB_DATUMCLOSE(recp->first);
free(cblistremove(leaf->recs, ri, NULL));
}
leaf->dirty = TRUE;
villa->rnum--;
if(!villa->tran && !vlcacheadjust(villa)) return FALSE;
return TRUE;
}
/* Retrieve a record. */
char *vlget(VILLA *villa, const char *kbuf, int ksiz, int *sp){
VLLEAF *leaf;
VLREC *recp;
char *rv;
int pid;
assert(villa && kbuf);
if(ksiz < 0) ksiz = strlen(kbuf);
if(villa->hleaf < VL_LEAFIDMIN || !(leaf = vlgethistleaf(villa, kbuf, ksiz))){
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1) return NULL;
if(!(leaf = vlleafload(villa, pid))) return NULL;
}
if(!(recp = vlrecsearch(villa, leaf, kbuf, ksiz, NULL))){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return NULL;
}
if(!villa->tran && !vlcacheadjust(villa)) return NULL;
if(sp) *sp = CB_DATUMSIZE(recp->first);
CB_MEMDUP(rv, CB_DATUMPTR(recp->first), CB_DATUMSIZE(recp->first));
return rv;
}
/* Get the size of the value of a record. */
int vlvsiz(VILLA *villa, const char *kbuf, int ksiz){
VLLEAF *leaf;
VLREC *recp;
int pid;
assert(villa && kbuf);
if(ksiz < 0) ksiz = strlen(kbuf);
if(villa->hleaf < VL_LEAFIDMIN || !(leaf = vlgethistleaf(villa, kbuf, ksiz))){
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1) return -1;
if(!(leaf = vlleafload(villa, pid))) return -1;
}
if(!(recp = vlrecsearch(villa, leaf, kbuf, ksiz, NULL))){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return -1;
}
if(!villa->tran && !vlcacheadjust(villa)) return -1;
return CB_DATUMSIZE(recp->first);
}
/* Get the number of records corresponding a key. */
int vlvnum(VILLA *villa, const char *kbuf, int ksiz){
VLLEAF *leaf;
VLREC *recp;
int pid;
assert(villa && kbuf);
if(ksiz < 0) ksiz = strlen(kbuf);
if(villa->hleaf < VL_LEAFIDMIN || !(leaf = vlgethistleaf(villa, kbuf, ksiz))){
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1) return 0;
if(!(leaf = vlleafload(villa, pid))) return 0;
}
if(!(recp = vlrecsearch(villa, leaf, kbuf, ksiz, NULL))){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return 0;
}
if(!villa->tran && !vlcacheadjust(villa)) return 0;
return 1 + (recp->rest ? CB_LISTNUM(recp->rest) : 0);
}
/* Store plural records corresponding a key. */
int vlputlist(VILLA *villa, const char *kbuf, int ksiz, const CBLIST *vals){
int i, vsiz;
const char *vbuf;
assert(villa && kbuf && vals);
if(!villa->wmode){
dpecodeset(DP_EMODE, __FILE__, __LINE__);
return FALSE;
}
if(CB_LISTNUM(vals) < 1){
dpecodeset(DP_EMISC, __FILE__, __LINE__);
return FALSE;
}
if(ksiz < 0) ksiz = strlen(kbuf);
for(i = 0; i < CB_LISTNUM(vals); i++){
vbuf = CB_LISTVAL2(vals, i, vsiz);
if(!vlput(villa, kbuf, ksiz, vbuf, vsiz, VL_DDUP)) return FALSE;
}
return TRUE;
}
/* Delete all records corresponding a key. */
int vloutlist(VILLA *villa, const char *kbuf, int ksiz){
int i, vnum;
assert(villa && kbuf);
if(!villa->wmode){
dpecodeset(DP_EMISC, __FILE__, __LINE__);
return FALSE;
}
if(ksiz < 0) ksiz = strlen(kbuf);
if((vnum = vlvnum(villa, kbuf, ksiz)) < 1) return FALSE;
for(i = 0; i < vnum; i++){
if(!vlout(villa, kbuf, ksiz)) return FALSE;
}
return TRUE;
}
/* Retrieve values of all records corresponding a key. */
CBLIST *vlgetlist(VILLA *villa, const char *kbuf, int ksiz){
VLLEAF *leaf;
VLREC *recp;
int pid, i, vsiz;
CBLIST *vals;
const char *vbuf;
assert(villa && kbuf);
if(ksiz < 0) ksiz = strlen(kbuf);
if(villa->hleaf < VL_LEAFIDMIN || !(leaf = vlgethistleaf(villa, kbuf, ksiz))){
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1) return NULL;
if(!(leaf = vlleafload(villa, pid))) return NULL;
}
if(!(recp = vlrecsearch(villa, leaf, kbuf, ksiz, NULL))){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return NULL;
}
CB_LISTOPEN(vals);
CB_LISTPUSH(vals, CB_DATUMPTR(recp->first), CB_DATUMSIZE(recp->first));
if(recp->rest){
for(i = 0; i < CB_LISTNUM(recp->rest); i++){
vbuf = CB_LISTVAL2(recp->rest, i, vsiz);
CB_LISTPUSH(vals, vbuf, vsiz);
}
}
if(!villa->tran && !vlcacheadjust(villa)){
CB_LISTCLOSE(vals);
return NULL;
}
return vals;
}
/* Retrieve concatenated values of all records corresponding a key. */
char *vlgetcat(VILLA *villa, const char *kbuf, int ksiz, int *sp){
VLLEAF *leaf;
VLREC *recp;
int pid, i, vsiz, rsiz;
char *rbuf;
const char *vbuf;
assert(villa && kbuf);
if(ksiz < 0) ksiz = strlen(kbuf);
if(villa->hleaf < VL_LEAFIDMIN || !(leaf = vlgethistleaf(villa, kbuf, ksiz))){
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1) return NULL;
if(!(leaf = vlleafload(villa, pid))) return NULL;
}
if(!(recp = vlrecsearch(villa, leaf, kbuf, ksiz, NULL))){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return NULL;
}
rsiz = CB_DATUMSIZE(recp->first);
CB_MALLOC(rbuf, rsiz + 1);
memcpy(rbuf, CB_DATUMPTR(recp->first), rsiz);
if(recp->rest){
for(i = 0; i < CB_LISTNUM(recp->rest); i++){
vbuf = CB_LISTVAL2(recp->rest, i, vsiz);
CB_REALLOC(rbuf, rsiz + vsiz + 1);
memcpy(rbuf + rsiz, vbuf, vsiz);
rsiz += vsiz;
}
}
rbuf[rsiz] = '\0';
if(!villa->tran && !vlcacheadjust(villa)){
free(rbuf);
return NULL;
}
if(sp) *sp = rsiz;
return rbuf;
}
/* Move the cursor to the first record. */
int vlcurfirst(VILLA *villa){
VLLEAF *leaf;
assert(villa);
villa->curleaf = VL_LEAFIDMIN;
villa->curknum = 0;
villa->curvnum = 0;
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
while(CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = leaf->next;
villa->curknum = 0;
villa->curvnum = 0;
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
}
return TRUE;
}
/* Move the cursor to the last record. */
int vlcurlast(VILLA *villa){
VLLEAF *leaf;
VLREC *recp;
assert(villa);
villa->curleaf = villa->last;
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
while(CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = leaf->prev;
if(villa->curleaf == -1){
villa->curleaf = -1;
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
}
villa->curknum = CB_LISTNUM(leaf->recs) - 1;
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
villa->curvnum = recp->rest ? CB_LISTNUM(recp->rest) : 0;
return TRUE;
}
/* Move the cursor to the previous record. */
int vlcurprev(VILLA *villa){
VLLEAF *leaf;
VLREC *recp;
assert(villa);
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf)) || CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = -1;
return FALSE;
}
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
villa->curvnum--;
if(villa->curvnum < 0){
villa->curknum--;
if(villa->curknum < 0){
villa->curleaf = leaf->prev;
if(villa->curleaf == -1){
villa->curleaf = -1;
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
while(CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = leaf->prev;
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
}
villa->curknum = CB_LISTNUM(leaf->recs) - 1;
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
villa->curvnum = recp->rest ? CB_LISTNUM(recp->rest) : 0;
}
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
villa->curvnum = recp->rest ? CB_LISTNUM(recp->rest) : 0;
}
if(!villa->tran && !vlcacheadjust(villa)) return FALSE;
return TRUE;
}
/* Move the cursor to the next record. */
int vlcurnext(VILLA *villa){
VLLEAF *leaf;
VLREC *recp;
assert(villa);
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf)) || CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = -1;
return FALSE;
}
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
villa->curvnum++;
if(villa->curvnum > (recp->rest ? CB_LISTNUM(recp->rest) : 0)){
villa->curknum++;
villa->curvnum = 0;
}
if(villa->curknum >= CB_LISTNUM(leaf->recs)){
villa->curleaf = leaf->next;
villa->curknum = 0;
villa->curvnum = 0;
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
while(CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = leaf->next;
villa->curknum = 0;
villa->curvnum = 0;
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
}
}
if(!villa->tran && !vlcacheadjust(villa)) return FALSE;
return TRUE;
}
/* Move the cursor to a position around a record. */
int vlcurjump(VILLA *villa, const char *kbuf, int ksiz, int jmode){
VLLEAF *leaf;
VLREC *recp;
int pid, index;
assert(villa && kbuf);
if(ksiz < 0) ksiz = strlen(kbuf);
if((pid = vlsearchleaf(villa, kbuf, ksiz)) == -1){
villa->curleaf = -1;
return FALSE;
}
if(!(leaf = vlleafload(villa, pid))){
villa->curleaf = -1;
return FALSE;
}
while(CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = (jmode == VL_JFORWARD) ? leaf->next : leaf->prev;
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
}
if(!(recp = vlrecsearch(villa, leaf, kbuf, ksiz, &index))){
if(jmode == VL_JFORWARD){
villa->curleaf = leaf->id;
if(index >= CB_LISTNUM(leaf->recs)) index--;
villa->curknum = index;
villa->curvnum = 0;
recp = (VLREC *)CB_LISTVAL(leaf->recs, index);
if(villa->cmp(kbuf, ksiz, CB_DATUMPTR(recp->key), CB_DATUMSIZE(recp->key)) < 0) return TRUE;
villa->curvnum = (recp->rest ? CB_LISTNUM(recp->rest) : 0);
return vlcurnext(villa);
} else {
villa->curleaf = leaf->id;
if(index >= CB_LISTNUM(leaf->recs)) index--;
villa->curknum = index;
recp = (VLREC *)CB_LISTVAL(leaf->recs, index);
villa->curvnum = (recp->rest ? CB_LISTNUM(recp->rest) : 0);
if(villa->cmp(kbuf, ksiz, CB_DATUMPTR(recp->key), CB_DATUMSIZE(recp->key)) > 0) return TRUE;
villa->curvnum = 0;
return vlcurprev(villa);
}
}
if(jmode == VL_JFORWARD){
villa->curleaf = pid;
villa->curknum = index;
villa->curvnum = 0;
} else {
villa->curleaf = pid;
villa->curknum = index;
villa->curvnum = (recp->rest ? CB_LISTNUM(recp->rest) : 0);
}
return TRUE;
}
/* Get the key of the record where the cursor is. */
char *vlcurkey(VILLA *villa, int *sp){
VLLEAF *leaf;
VLREC *recp;
const char *kbuf;
char *rv;
int ksiz;
assert(villa);
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
kbuf = CB_DATUMPTR(recp->key);
ksiz = CB_DATUMSIZE(recp->key);
if(sp) *sp = ksiz;
CB_MEMDUP(rv, kbuf, ksiz);
return rv;
}
/* Get the value of the record where the cursor is. */
char *vlcurval(VILLA *villa, int *sp){
VLLEAF *leaf;
VLREC *recp;
const char *vbuf;
char *rv;
int vsiz;
assert(villa);
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
if(villa->curvnum < 1){
vbuf = CB_DATUMPTR(recp->first);
vsiz = CB_DATUMSIZE(recp->first);
} else {
vbuf = CB_LISTVAL2(recp->rest, villa->curvnum - 1, vsiz);
}
if(sp) *sp = vsiz;
CB_MEMDUP(rv, vbuf, vsiz);
return rv;
}
/* Insert a record around the cursor. */
int vlcurput(VILLA *villa, const char *vbuf, int vsiz, int cpmode){
VLLEAF *leaf;
VLREC *recp;
char *tbuf;
int tsiz;
assert(villa && vbuf);
if(!villa->wmode){
dpecodeset(DP_EMODE, __FILE__, __LINE__);
return FALSE;
}
if(vsiz < 0) vsiz = strlen(vbuf);
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
switch(cpmode){
case VL_CPBEFORE:
if(villa->curvnum < 1){
if(!recp->rest){
CB_DATUMTOMALLOC(recp->first, tbuf, tsiz);
CB_DATUMOPEN2(recp->first, vbuf, vsiz);
CB_LISTOPEN(recp->rest);
CB_LISTPUSHBUF(recp->rest, tbuf, tsiz);
} else {
cblistunshift(recp->rest, CB_DATUMPTR(recp->first), CB_DATUMSIZE(recp->first));
CB_DATUMSETSIZE(recp->first, 0);
CB_DATUMCAT(recp->first, vbuf, vsiz);
}
} else {
CB_LISTINSERT(recp->rest, villa->curvnum - 1, vbuf, vsiz);
}
villa->rnum++;
break;
case VL_CPAFTER:
if(!recp->rest) CB_LISTOPEN(recp->rest);
CB_LISTINSERT(recp->rest, villa->curvnum, vbuf, vsiz);
villa->curvnum++;
villa->rnum++;
break;
default:
if(villa->curvnum < 1){
CB_DATUMSETSIZE(recp->first, 0);
CB_DATUMCAT(recp->first, vbuf, vsiz);
} else {
cblistover(recp->rest, villa->curvnum - 1, vbuf, vsiz);
}
break;
}
leaf->dirty = TRUE;
return TRUE;
}
/* Delete the record where the cursor is. */
int vlcurout(VILLA *villa){
VLLEAF *leaf;
VLREC *recp;
char *vbuf;
int vsiz;
assert(villa);
if(!villa->wmode){
dpecodeset(DP_EMODE, __FILE__, __LINE__);
return FALSE;
}
if(villa->curleaf == -1){
dpecodeset(DP_ENOITEM, __FILE__, __LINE__);
return FALSE;
}
if(!(leaf = vlleafload(villa, villa->curleaf))){
villa->curleaf = -1;
return FALSE;
}
recp = (VLREC *)CB_LISTVAL(leaf->recs, villa->curknum);
if(villa->curvnum < 1){
if(recp->rest){
vbuf = cblistshift(recp->rest, &vsiz);
CB_DATUMSETSIZE(recp->first, 0);
CB_DATUMCAT(recp->first, vbuf, vsiz);
free(vbuf);
if(CB_LISTNUM(recp->rest) < 1){
CB_LISTCLOSE(recp->rest);
recp->rest = NULL;
}
} else {
CB_DATUMCLOSE(recp->first);
CB_DATUMCLOSE(recp->key);
free(cblistremove(leaf->recs, villa->curknum, NULL));
}
} else {
free(cblistremove(recp->rest, villa->curvnum - 1, NULL));
if(villa->curvnum - 1 >= CB_LISTNUM(recp->rest)){
villa->curknum++;
villa->curvnum = 0;
}
if(CB_LISTNUM(recp->rest) < 1){
CB_LISTCLOSE(recp->rest);
recp->rest = NULL;
}
}
villa->rnum--;
leaf->dirty = TRUE;
if(villa->curknum >= CB_LISTNUM(leaf->recs)){
villa->curleaf = leaf->next;
villa->curknum = 0;
villa->curvnum = 0;
while(villa->curleaf != -1 && (leaf = vlleafload(villa, villa->curleaf)) != NULL &&
CB_LISTNUM(leaf->recs) < 1){
villa->curleaf = leaf->next;
}
}
return TRUE;
}
/* Set the tuning parameters for performance. */
void vlsettuning(VILLA *villa, int lrecmax, int nidxmax, int lcnum, int ncnum){
assert(villa);
if(lrecmax < 1) lrecmax = VL_DEFLRECMAX;
if(lrecmax < 3) lrecmax = 3;
if(nidxmax < 1) nidxmax = VL_DEFNIDXMAX;
if(nidxmax < 4) nidxmax = 4;
if(lcnum < 1) lcnum = VL_DEFLCNUM;
if(lcnum < VL_CACHEOUT * 2) lcnum = VL_CACHEOUT * 2;
if(ncnum < 1) ncnum = VL_DEFNCNUM;
if(ncnum < VL_CACHEOUT * 2) ncnum = VL_CACHEOUT * 2;
villa->leafrecmax = lrecmax;
villa->nodeidxmax = nidxmax;
villa->leafcnum = lcnum;
villa->nodecnum = ncnum;
}
/* Set the size of the free block pool of a database handle. */
int vlsetfbpsiz(VILLA *villa, int size){
assert(villa && size >= 0);
if(!villa->wmode){
dpecodeset(DP_EMODE, __FILE__, __LINE__);
return FALSE;
}
return dpsetfbpsiz(villa->depot, size);
}
/* Synchronize updating contents with the file and the device. */