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Break out DBBE drivers into separate files. (CVS 157)

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FossilOrigin-Name: 979ef5d5d64b8e38cc15fef0d2d507ca2fe6842c
This commit is contained in:
drh 2000-10-19 01:49:02 +00:00
parent 58c2976fa9
commit bb0b679c02
10 changed files with 942 additions and 818 deletions
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6
Makefile.in
View File

@ -47,7 +47,7 @@ LIBREADLINE = @TARGET_READLINE_LIBS@
# Object files for the SQLite library. # Object files for the SQLite library.
# #
LIBOBJ = build.o dbbe.o delete.o expr.o insert.o \ LIBOBJ = build.o dbbe.o dbbegdbm.o delete.o expr.o insert.o \
main.o parse.o printf.o select.o table.o tokenize.o update.o \ main.o parse.o printf.o select.o table.o tokenize.o update.o \
util.o vdbe.o where.o tclsqlite.o util.o vdbe.o where.o tclsqlite.o
@ -56,6 +56,7 @@ LIBOBJ = build.o dbbe.o delete.o expr.o insert.o \
SRC = \ SRC = \
$(TOP)/src/build.c \ $(TOP)/src/build.c \
$(TOP)/src/dbbe.c \ $(TOP)/src/dbbe.c \
$(TOP)/src/dbbegdbm.c \
$(TOP)/src/dbbe.h \ $(TOP)/src/dbbe.h \
$(TOP)/src/dbbemem.c \ $(TOP)/src/dbbemem.c \
$(TOP)/src/delete.c \ $(TOP)/src/delete.c \
@ -118,6 +119,9 @@ build.o: $(TOP)/src/build.c $(HDR)
dbbe.o: $(TOP)/src/dbbe.c $(HDR) dbbe.o: $(TOP)/src/dbbe.c $(HDR)
$(TCC) $(GDBM_FLAGS) -c $(TOP)/src/dbbe.c $(TCC) $(GDBM_FLAGS) -c $(TOP)/src/dbbe.c
dbbegdbm.o: $(TOP)/src/dbbegdbm.c $(HDR)
$(TCC) $(GDBM_FLAGS) -c $(TOP)/src/dbbegdbm.c
main.o: $(TOP)/src/main.c $(HDR) main.o: $(TOP)/src/main.c $(HDR)
$(TCC) $(GDBM_FLAGS) -c $(TOP)/src/main.c $(TCC) $(GDBM_FLAGS) -c $(TOP)/src/main.c

2
VERSION
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@ -1 +1 @@
1.0.12 1.0.13

25
manifest
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@ -1,20 +1,21 @@
C Version\s1.0.12\s(CVS\s491) C Break\sout\sDBBE\sdrivers\sinto\sseparate\sfiles.\s(CVS\s157)
D 2000-10-17T01:35:00 D 2000-10-19T01:49:02
F COPYRIGHT 74a8a6531a42e124df07ab5599aad63870fa0bd4 F COPYRIGHT 74a8a6531a42e124df07ab5599aad63870fa0bd4
F Makefile.in faecea9b6419cec25030b4818c9b3f7f4163b3c1 F Makefile.in e52c865acc544f539820b2c3efad5af6e6a0c533
F README 51f6a4e7408b34afa5bc1c0485f61b6a4efb6958 F README 51f6a4e7408b34afa5bc1c0485f61b6a4efb6958
F VERSION 0a8a772d5d713cb4d3d7b6ddedf1335436f90263 F VERSION 8029dd7a9837bd0f6a598758411f7b68ecc8d433
F configure 3dc1edb9dcf60215e31ff72b447935ab62211442 x F configure 3dc1edb9dcf60215e31ff72b447935ab62211442 x
F configure.in d892ca33db7e88a055519ce2f36dcb11020e8fff F configure.in d892ca33db7e88a055519ce2f36dcb11020e8fff
F doc/lemon.html e233a3e97a779c7a87e1bc4528c664a58e49dd47 F doc/lemon.html e233a3e97a779c7a87e1bc4528c664a58e49dd47
F src/build.c e2ceba852dc45ca899e68a042b29c3daab011575 F src/build.c e2ceba852dc45ca899e68a042b29c3daab011575
F src/dbbe.c 226daaf8c095ceb4aff48cad188dad90643f9867 F src/dbbe.c 5f8f9aa18a17e728e604dc48bc435111ce7d4f73
F src/dbbe.h 6337132f904e72ecb28b07390021c241397e4cbf F src/dbbe.h d175a04b35ea75078274e059dcbcbf7c1262d42a
F src/dbbegdbm.c 4ac7222afff0cf91014803f8791740b6da825a2b
F src/dbbemem.c eb3d79be7105bd80069815ee499c8e8682876378 F src/dbbemem.c eb3d79be7105bd80069815ee499c8e8682876378
F src/delete.c 4d491eaf61b515516749c7ed68fa3b2ee8a09065 F src/delete.c 4d491eaf61b515516749c7ed68fa3b2ee8a09065
F src/expr.c e8e350d7baa33bd9ed8701c159eaba5e912e0adb F src/expr.c e8e350d7baa33bd9ed8701c159eaba5e912e0adb
F src/insert.c f146f149ad2422a1dc3bfa7a1651a25940f98958 F src/insert.c f146f149ad2422a1dc3bfa7a1651a25940f98958
F src/main.c 4774731549159ba33c031cfaf6e4c78630c80d96 F src/main.c 6686df1f9e88fb72c3b3fc660d4595382555fb5c
F src/parse.y 5d199034de5d29ebedb42c1c51f34db4df40cbe5 F src/parse.y 5d199034de5d29ebedb42c1c51f34db4df40cbe5
F src/printf.c 1efb6b3e7f28a93be57132de3f8f400d2ac1460e F src/printf.c 1efb6b3e7f28a93be57132de3f8f400d2ac1460e
F src/select.c c1de8ac34131324fa05664b06b0ae1ee9c02905d F src/select.c c1de8ac34131324fa05664b06b0ae1ee9c02905d
@ -27,7 +28,7 @@ F src/tclsqlite.c 44b08b47612a668caaf7c4ec32133b69d73ff78e
F src/tokenize.c b0f5c12598105ec924c0733a916485f920168720 F src/tokenize.c b0f5c12598105ec924c0733a916485f920168720
F src/update.c 51b9ef7434b15e31096155da920302e9db0d27fc F src/update.c 51b9ef7434b15e31096155da920302e9db0d27fc
F src/util.c 811e0ad47f842c16555aaf361b26dab7221c1a6c F src/util.c 811e0ad47f842c16555aaf361b26dab7221c1a6c
F src/vdbe.c 7acc17367da350259107dcb1dac5590e8747b890 F src/vdbe.c a876c75429903acb9167b741b0513ef0198f6001
F src/vdbe.h 140cdec3c56f70483e169f8ae657bd90f9fd6e98 F src/vdbe.h 140cdec3c56f70483e169f8ae657bd90f9fd6e98
F src/where.c 3dfad2ffd0aa994d5eceac88852f7189c8d1d3c8 F src/where.c 3dfad2ffd0aa994d5eceac88852f7189c8d1d3c8
F test/all.test 0950c135cab7e60c07bd745ccfad1476211e5bd7 F test/all.test 0950c135cab7e60c07bd745ccfad1476211e5bd7
@ -65,7 +66,7 @@ F www/arch.fig 4f246003b7da23bd63b8b0af0618afb4ee3055c8
F www/arch.png 8dae0766d42ed3de9ed013c1341a5792bcf633e6 F www/arch.png 8dae0766d42ed3de9ed013c1341a5792bcf633e6
F www/arch.tcl a40380c1fe0080c43e6cc5c20ed70731511b06be F www/arch.tcl a40380c1fe0080c43e6cc5c20ed70731511b06be
F www/c_interface.tcl 1a0b13d056625e4acb59b67edc360cfd9c92ba90 F www/c_interface.tcl 1a0b13d056625e4acb59b67edc360cfd9c92ba90
F www/changes.tcl 4f3d27bdd02f253e38907c55768871dba3677ddf F www/changes.tcl 08e23dd0438b5b5ef3a67dbf57e065186343c9be
F www/crosscompile.tcl bee79c34f6c3f162ec1c6f5294e79f73651d27ee F www/crosscompile.tcl bee79c34f6c3f162ec1c6f5294e79f73651d27ee
F www/fileformat.tcl cfb7fba80b7275555281ba2f256c00734bcdd1c9 F www/fileformat.tcl cfb7fba80b7275555281ba2f256c00734bcdd1c9
F www/index.tcl b19418d506f90968deef972bf1b427d98bdf13e0 F www/index.tcl b19418d506f90968deef972bf1b427d98bdf13e0
@ -75,7 +76,7 @@ F www/opcode.tcl cb3a1abf8b7b9be9f3a228d097d6bf8b742c2b6f
F www/sqlite.tcl cb0d23d8f061a80543928755ec7775da6e4f362f F www/sqlite.tcl cb0d23d8f061a80543928755ec7775da6e4f362f
F www/tclsqlite.tcl ae101d5f7c07dcc59770e2a84aae09025fab2dad F www/tclsqlite.tcl ae101d5f7c07dcc59770e2a84aae09025fab2dad
F www/vdbe.tcl bcbfc33bcdd0ebad95eab31286adb9e1bc289520 F www/vdbe.tcl bcbfc33bcdd0ebad95eab31286adb9e1bc289520
P 17fcd3b01568e95224425b982fb77abd8b12191a P 7330218a912ea788b0c83fa7c7350fd6df88b18a
R 9d72075e97e2decee6bef55f36d23c73 R f2349cd3f015fde9fcbd6e3d9e05118d
U drh U drh
Z dc6f764623dcec0a5a01e239a81f28c8 Z f79070030a7939f47c5a891f83eee50c

2
manifest.uuid
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@ -1 +1 @@
7330218a912ea788b0c83fa7c7350fd6df88b18a 979ef5d5d64b8e38cc15fef0d2d507ca2fe6842c

706
src/dbbe.c
View File

@ -30,124 +30,17 @@
** relatively simple to convert to a different database such ** relatively simple to convert to a different database such
** as NDBM, SDBM, or BerkeleyDB. ** as NDBM, SDBM, or BerkeleyDB.
** **
** $Id: dbbe.c,v 1.19 2000/08/17 09:50:00 drh Exp $ ** $Id: dbbe.c,v 1.20 2000/10/19 01:49:02 drh Exp $
*/ */
#include "sqliteInt.h" #include "sqliteInt.h"
#include <gdbm.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <time.h>
/* /*
** Information about each open disk file is an instance of this ** This routine opens a new database. It looks at the first
** structure. There will only be one such structure for each ** few characters of the database name to try to determine what
** disk file. If the VDBE opens the same file twice (as will happen ** kind of database to open. If the first characters are "gdbm:",
** for a self-join, for example) then two DbbeCursor structures are ** then it uses the GDBM driver. If the first few characters are
** created but there is only a single BeFile structure with an ** "memory:" then it uses the in-memory driver. If there is no
** nRef of 2. ** match, the default to the GDBM driver.
*/
typedef struct BeFile BeFile;
struct BeFile {
char *zName; /* Name of the file */
GDBM_FILE dbf; /* The file itself */
int nRef; /* Number of references */
int delOnClose; /* Delete when closing */
int writeable; /* Opened for writing */
BeFile *pNext, *pPrev; /* Next and previous on list of open files */
};
/*
** The following structure holds the current state of the RC4 algorithm.
** We use RC4 as a random number generator. Each call to RC4 gives
** a random 8-bit number.
**
** Nothing in this file or anywhere else in SQLite does any kind of
** encryption. The RC4 algorithm is being used as a PRNG (pseudo-random
** number generator) not as an encryption device.
*/
struct rc4 {
int i, j;
int s[256];
};
/*
** The complete database is an instance of the following structure.
*/
struct Dbbe {
char *zDir; /* The directory containing the database */
int write; /* True for write permission */
BeFile *pOpen; /* List of open files */
int nTemp; /* Number of temporary files created */
FILE **apTemp; /* Space to hold temporary file pointers */
char **azTemp; /* Names of the temporary files */
struct rc4 rc4; /* The random number generator */
};
/*
** An cursor into a database file is an instance of the following structure.
** There can only be a single BeFile structure for each disk file, but
** there can be multiple DbbeCursor structures. Each DbbeCursor represents
** a cursor pointing to a particular part of the open BeFile. The
** BeFile.nRef field hold a count of the number of DbbeCursor structures
** associated with the same disk file.
*/
struct DbbeCursor {
Dbbe *pBe; /* The database of which this record is a part */
BeFile *pFile; /* The database file for this table */
datum key; /* Most recently used key */
datum data; /* Most recent data */
int needRewind; /* Next key should be the first */
int readPending; /* The fetch hasn't actually been done yet */
};
/*
** Initialize the RC4 PRNG. "seed" is a pointer to some random
** data used to initialize the PRNG.
*/
static void rc4init(struct rc4 *p, char *seed, int seedlen){
int i;
char k[256];
p->j = 0;
p->i = 0;
for(i=0; i<256; i++){
p->s[i] = i;
k[i] = seed[i%seedlen];
}
for(i=0; i<256; i++){
int t;
p->j = (p->j + p->s[i] + k[i]) & 0xff;
t = p->s[p->j];
p->s[p->j] = p->s[i];
p->s[i] = t;
}
}
/*
** Get a single 8-bit random value from the RC4 PRNG.
*/
static int rc4byte(struct rc4 *p){
int t;
p->i = (p->i + 1) & 0xff;
p->j = (p->j + p->s[p->i]) & 0xff;
t = p->s[p->i];
p->s[p->i] = p->s[p->j];
p->s[p->j] = t;
t = p->s[p->i] + p->s[p->j];
return t & 0xff;
}
/*
** The "mkdir()" function only takes one argument under Windows.
*/
#if OS_WIN
# define mkdir(A,B) mkdir(A)
#endif
/*
** This routine opens a new database. For the GDBM driver
** implemented here, the database name is the name of the directory
** containing all the files of the database.
** **
** If successful, a pointer to the Dbbe structure is returned. ** If successful, a pointer to the Dbbe structure is returned.
** If there are errors, an appropriate error message is left ** If there are errors, an appropriate error message is left
@ -159,582 +52,15 @@ Dbbe *sqliteDbbeOpen(
int createFlag, /* True to create database if it doesn't exist */ int createFlag, /* True to create database if it doesn't exist */
char **pzErrMsg /* Write error messages (if any) here */ char **pzErrMsg /* Write error messages (if any) here */
){ ){
Dbbe *pNew; extern Dbbe *sqliteGdbmOpen(const char*,int,int,char**);
struct stat statbuf; if( strncmp(zName, "gdbm:", 5)==0 ){
char *zMaster; return sqliteGdbmOpen(&zName[5], writeFlag, createFlag, pzErrMsg);
if( !writeFlag ) createFlag = 0;
if( stat(zName, &statbuf)!=0 ){
if( createFlag ) mkdir(zName, 0750);
if( stat(zName, &statbuf)!=0 ){
sqliteSetString(pzErrMsg, createFlag ?
"can't find or create directory \"" : "can't find directory \"",
zName, "\"", 0);
return 0;
}
} }
if( !S_ISDIR(statbuf.st_mode) ){ #if 0
sqliteSetString(pzErrMsg, "not a directory: \"", zName, "\"", 0); if( strncmp(zName, "memory:", 7)==0 ){
return 0; extern Dbbe *sqliteMemOpen(const char*,int,int,char**);
return sqliteMemOpen(&zName[7], writeFlag, createFlag, pzErrMsg);
} }
if( access(zName, writeFlag ? (X_OK|W_OK|R_OK) : (X_OK|R_OK)) ){ #endif
sqliteSetString(pzErrMsg, "access permission denied", 0); return sqliteGdbmOpen(zName, writeFlag, createFlag, pzErrMsg);
return 0;
}
zMaster = 0;
sqliteSetString(&zMaster, zName, "/" MASTER_NAME ".tbl", 0);
if( stat(zMaster, &statbuf)==0
&& access(zMaster, writeFlag ? (W_OK|R_OK) : R_OK)!=0 ){
sqliteSetString(pzErrMsg, "access permission denied for ", zMaster, 0);
sqliteFree(zMaster);
return 0;
}
sqliteFree(zMaster);
pNew = sqliteMalloc(sizeof(Dbbe) + strlen(zName) + 1);
if( pNew==0 ){
sqliteSetString(pzErrMsg, "out of memory", 0);
return 0;
}
pNew->zDir = (char*)&pNew[1];
strcpy(pNew->zDir, zName);
pNew->write = writeFlag;
pNew->pOpen = 0;
time(&statbuf.st_ctime);
rc4init(&pNew->rc4, (char*)&statbuf, sizeof(statbuf));
return pNew;
}
/*
** Completely shutdown the given database. Close all files. Free all memory.
*/
void sqliteDbbeClose(Dbbe *pBe){
BeFile *pFile, *pNext;
int i;
for(pFile=pBe->pOpen; pFile; pFile=pNext){
pNext = pFile->pNext;
gdbm_close(pFile->dbf);
memset(pFile, 0, sizeof(*pFile));
sqliteFree(pFile);
}
for(i=0; i<pBe->nTemp; i++){
if( pBe->apTemp[i]!=0 ){
unlink(pBe->azTemp[i]);
fclose(pBe->apTemp[i]);
sqliteFree(pBe->azTemp[i]);
pBe->apTemp[i] = 0;
pBe->azTemp[i] = 0;
break;
}
}
sqliteFree(pBe->azTemp);
sqliteFree(pBe->apTemp);
memset(pBe, 0, sizeof(*pBe));
sqliteFree(pBe);
}
/*
** Translate the name of an SQL table (or index) into the name
** of a file that holds the key/data pairs for that table or
** index. Space to hold the filename is obtained from
** sqliteMalloc() and must be freed by the calling function.
*/
static char *sqliteFileOfTable(Dbbe *pBe, const char *zTable){
char *zFile = 0;
int i;
sqliteSetString(&zFile, pBe->zDir, "/", zTable, ".tbl", 0);
if( zFile==0 ) return 0;
for(i=strlen(pBe->zDir)+1; zFile[i]; i++){
int c = zFile[i];
if( isupper(c) ){
zFile[i] = tolower(c);
}else if( !isalnum(c) && c!='-' && c!='_' && c!='.' ){
zFile[i] = '+';
}
}
return zFile;
}
/*
** Generate a random filename with the given prefix. The new filename
** is written into zBuf[]. The calling function must insure that
** zBuf[] is big enough to hold the prefix plus 20 or so extra
** characters.
**
** Very random names are chosen so that the chance of a
** collision with an existing filename is very very small.
*/
static void randomName(struct rc4 *pRc4, char *zBuf, char *zPrefix){
int i, j;
static const char zRandomChars[] = "abcdefghijklmnopqrstuvwxyz0123456789";
strcpy(zBuf, zPrefix);
j = strlen(zBuf);
for(i=0; i<15; i++){
int c = rc4byte(pRc4) % (sizeof(zRandomChars) - 1);
zBuf[j++] = zRandomChars[c];
}
zBuf[j] = 0;
}
/*
** Open a new table cursor. Write a pointer to the corresponding
** DbbeCursor structure into *ppCursr. Return an integer success
** code:
**
** SQLITE_OK It worked!
**
** SQLITE_NOMEM sqliteMalloc() failed
**
** SQLITE_PERM Attempt to access a file for which file
** access permission is denied
**
** SQLITE_BUSY Another thread or process is already using
** the corresponding file and has that file locked.
**
** SQLITE_READONLY The current thread already has this file open
** readonly but you are trying to open for writing.
** (This can happen if a SELECT callback tries to
** do an UPDATE or DELETE.)
**
** If zTable is 0 or "", then a temporary database file is created and
** a cursor to that temporary file is opened. The temporary file
** will be deleted from the disk when it is closed.
*/
int sqliteDbbeOpenCursor(
Dbbe *pBe, /* The database the table belongs to */
const char *zTable, /* The SQL name of the file to be opened */
int writeable, /* True to open for writing */
DbbeCursor **ppCursr /* Write the resulting table pointer here */
){
char *zFile; /* Name of the table file */
DbbeCursor *pCursr; /* The new table cursor */
BeFile *pFile; /* The underlying data file for this table */
int rc = SQLITE_OK; /* Return value */
int rw_mask; /* Permissions mask for opening a table */
int mode; /* Mode for opening a table */
*ppCursr = 0;
pCursr = sqliteMalloc( sizeof(*pCursr) );
if( pCursr==0 ) return SQLITE_NOMEM;
if( zTable ){
zFile = sqliteFileOfTable(pBe, zTable);
for(pFile=pBe->pOpen; pFile; pFile=pFile->pNext){
if( strcmp(pFile->zName,zFile)==0 ) break;
}
}else{
pFile = 0;
zFile = 0;
}
if( pFile==0 ){
if( writeable ){
rw_mask = GDBM_WRCREAT | GDBM_FAST;
mode = 0640;
}else{
rw_mask = GDBM_READER;
mode = 0640;
}
pFile = sqliteMalloc( sizeof(*pFile) );
if( pFile==0 ){
sqliteFree(zFile);
return SQLITE_NOMEM;
}
if( zFile ){
if( !writeable || pBe->write ){
pFile->dbf = gdbm_open(zFile, 0, rw_mask, mode, 0);
}else{
pFile->dbf = 0;
}
}else{
int limit;
struct rc4 *pRc4;
char zRandom[50];
pRc4 = &pBe->rc4;
zFile = 0;
limit = 5;
do {
randomName(&pBe->rc4, zRandom, "_temp_table_");
sqliteFree(zFile);
zFile = sqliteFileOfTable(pBe, zRandom);
pFile->dbf = gdbm_open(zFile, 0, rw_mask, mode, 0);
}while( pFile->dbf==0 && limit-- >= 0);
pFile->delOnClose = 1;
}
pFile->writeable = writeable;
pFile->zName = zFile;
pFile->nRef = 1;
pFile->pPrev = 0;
if( pBe->pOpen ){
pBe->pOpen->pPrev = pFile;
}
pFile->pNext = pBe->pOpen;
pBe->pOpen = pFile;
if( pFile->dbf==0 ){
if( !writeable && access(zFile,0) ){
/* Trying to read a non-existant file. This is OK. All the
** reads will return empty, which is what we want. */
rc = SQLITE_OK;
}else if( pBe->write==0 ){
rc = SQLITE_READONLY;
}else if( access(zFile,W_OK|R_OK) ){
rc = SQLITE_PERM;
}else{
rc = SQLITE_BUSY;
}
}
}else{
sqliteFree(zFile);
pFile->nRef++;
if( writeable && !pFile->writeable ){
rc = SQLITE_READONLY;
}
}
pCursr->pBe = pBe;
pCursr->pFile = pFile;
pCursr->readPending = 0;
pCursr->needRewind = 1;
if( rc!=SQLITE_OK ){
sqliteDbbeCloseCursor(pCursr);
*ppCursr = 0;
}else{
*ppCursr = pCursr;
}
return rc;
}
/*
** Drop a table from the database. The file on the disk that corresponds
** to this table is deleted.
*/
void sqliteDbbeDropTable(Dbbe *pBe, const char *zTable){
char *zFile; /* Name of the table file */
zFile = sqliteFileOfTable(pBe, zTable);
unlink(zFile);
sqliteFree(zFile);
}
/*
** Reorganize a table to reduce search times and disk usage.
*/
int sqliteDbbeReorganizeTable(Dbbe *pBe, const char *zTable){
DbbeCursor *pCrsr;
int rc;
rc = sqliteDbbeOpenCursor(pBe, zTable, 1, &pCrsr);
if( rc!=SQLITE_OK ){
return rc;
}
if( pCrsr && pCrsr->pFile && pCrsr->pFile->dbf ){
gdbm_reorganize(pCrsr->pFile->dbf);
}
if( pCrsr ){
sqliteDbbeCloseCursor(pCrsr);
}
return SQLITE_OK;
}
/*
** Close a cursor previously opened by sqliteDbbeOpenCursor().
**
** There can be multiple cursors pointing to the same open file.
** The underlying file is not closed until all cursors have been
** closed. This routine decrements the BeFile.nref field of the
** underlying file and closes the file when nref reaches 0.
*/
void sqliteDbbeCloseCursor(DbbeCursor *pCursr){
BeFile *pFile;
Dbbe *pBe;
if( pCursr==0 ) return;
pFile = pCursr->pFile;
pBe = pCursr->pBe;
pFile->nRef--;
if( pFile->dbf!=NULL ){
gdbm_sync(pFile->dbf);
}
if( pFile->nRef<=0 ){
if( pFile->dbf!=NULL ){
gdbm_close(pFile->dbf);
}
if( pFile->pPrev ){
pFile->pPrev->pNext = pFile->pNext;
}else{
pBe->pOpen = pFile->pNext;
}
if( pFile->pNext ){
pFile->pNext->pPrev = pFile->pPrev;
}
if( pFile->delOnClose ){
unlink(pFile->zName);
}
sqliteFree(pFile->zName);
memset(pFile, 0, sizeof(*pFile));
sqliteFree(pFile);
}
if( pCursr->key.dptr ) free(pCursr->key.dptr);
if( pCursr->data.dptr ) free(pCursr->data.dptr);
memset(pCursr, 0, sizeof(*pCursr));
sqliteFree(pCursr);
}
/*
** Clear the given datum
*/
static void datumClear(datum *p){
if( p->dptr ) free(p->dptr);
p->dptr = 0;
p->dsize = 0;
}
/*
** Fetch a single record from an open cursor. Return 1 on success
** and 0 on failure.
*/
int sqliteDbbeFetch(DbbeCursor *pCursr, int nKey, char *pKey){
datum key;
key.dsize = nKey;
key.dptr = pKey;
datumClear(&pCursr->key);
datumClear(&pCursr->data);
if( pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, key);
}
return pCursr->data.dptr!=0;
}
/*
** Return 1 if the given key is already in the table. Return 0
** if it is not.
*/
int sqliteDbbeTest(DbbeCursor *pCursr, int nKey, char *pKey){
datum key;
int result = 0;
key.dsize = nKey;
key.dptr = pKey;
if( pCursr->pFile && pCursr->pFile->dbf ){
result = gdbm_exists(pCursr->pFile->dbf, key);
}
return result;
}
/*
** Copy bytes from the current key or data into a buffer supplied by
** the calling function. Return the number of bytes copied.
*/
int sqliteDbbeCopyKey(DbbeCursor *pCursr, int offset, int size, char *zBuf){
int n;
if( offset>=pCursr->key.dsize ) return 0;
if( offset+size>pCursr->key.dsize ){
n = pCursr->key.dsize - offset;
}else{
n = size;
}
memcpy(zBuf, &pCursr->key.dptr[offset], n);
return n;
}
int sqliteDbbeCopyData(DbbeCursor *pCursr, int offset, int size, char *zBuf){
int n;
if( pCursr->readPending && pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, pCursr->key);
pCursr->readPending = 0;
}
if( offset>=pCursr->data.dsize ) return 0;
if( offset+size>pCursr->data.dsize ){
n = pCursr->data.dsize - offset;
}else{
n = size;
}
memcpy(zBuf, &pCursr->data.dptr[offset], n);
return n;
}
/*
** Return a pointer to bytes from the key or data. The data returned
** is ephemeral.
*/
char *sqliteDbbeReadKey(DbbeCursor *pCursr, int offset){
if( offset<0 || offset>=pCursr->key.dsize ) return "";
return &pCursr->key.dptr[offset];
}
char *sqliteDbbeReadData(DbbeCursor *pCursr, int offset){
if( pCursr->readPending && pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, pCursr->key);
pCursr->readPending = 0;
}
if( offset<0 || offset>=pCursr->data.dsize ) return "";
return &pCursr->data.dptr[offset];
}
/*
** Return the total number of bytes in either data or key.
*/
int sqliteDbbeKeyLength(DbbeCursor *pCursr){
return pCursr->key.dsize;
}
int sqliteDbbeDataLength(DbbeCursor *pCursr){
if( pCursr->readPending && pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, pCursr->key);
pCursr->readPending = 0;
}
return pCursr->data.dsize;
}
/*
** Make is so that the next call to sqliteNextKey() finds the first
** key of the table.
*/
int sqliteDbbeRewind(DbbeCursor *pCursr){
pCursr->needRewind = 1;
return SQLITE_OK;
}
/*
** Read the next key from the table. Return 1 on success. Return
** 0 if there are no more keys.
*/
int sqliteDbbeNextKey(DbbeCursor *pCursr){
datum nextkey;
int rc;
if( pCursr==0 || pCursr->pFile==0 || pCursr->pFile->dbf==0 ){
pCursr->readPending = 0;
return 0;
}
if( pCursr->needRewind ){
nextkey = gdbm_firstkey(pCursr->pFile->dbf);
pCursr->needRewind = 0;
}else{
nextkey = gdbm_nextkey(pCursr->pFile->dbf, pCursr->key);
}
datumClear(&pCursr->key);
datumClear(&pCursr->data);
pCursr->key = nextkey;
if( pCursr->key.dptr ){
pCursr->readPending = 1;
rc = 1;
}else{
pCursr->needRewind = 1;
pCursr->readPending = 0;
rc = 0;
}
return rc;
}
/*
** Get a new integer key.
*/
int sqliteDbbeNew(DbbeCursor *pCursr){
int iKey;
datum key;
int go = 1;
int i;
struct rc4 *pRc4;
if( pCursr->pFile==0 || pCursr->pFile->dbf==0 ) return 1;
pRc4 = &pCursr->pBe->rc4;
while( go ){
iKey = 0;
for(i=0; i<4; i++){
iKey = (iKey<<8) + rc4byte(pRc4);
}
if( iKey==0 ) continue;
key.dptr = (char*)&iKey;
key.dsize = 4;
go = gdbm_exists(pCursr->pFile->dbf, key);
}
return iKey;
}
/*
** Write an entry into the table. Overwrite any prior entry with the
** same key.
*/
int sqliteDbbePut(DbbeCursor *pCursr, int nKey,char *pKey,int nData,char *pData){
datum data, key;
int rc;
if( pCursr->pFile==0 || pCursr->pFile->dbf==0 ) return SQLITE_ERROR;
data.dsize = nData;
data.dptr = pData;
key.dsize = nKey;
key.dptr = pKey;
rc = gdbm_store(pCursr->pFile->dbf, key, data, GDBM_REPLACE);
if( rc ) rc = SQLITE_ERROR;
datumClear(&pCursr->key);
datumClear(&pCursr->data);
return rc;
}
/*
** Remove an entry from a table, if the entry exists.
*/
int sqliteDbbeDelete(DbbeCursor *pCursr, int nKey, char *pKey){
datum key;
int rc;
datumClear(&pCursr->key);
datumClear(&pCursr->data);
if( pCursr->pFile==0 || pCursr->pFile->dbf==0 ) return SQLITE_ERROR;
key.dsize = nKey;
key.dptr = pKey;
rc = gdbm_delete(pCursr->pFile->dbf, key);
if( rc ) rc = SQLITE_ERROR;
return rc;
}
/*
** Open a temporary file. The file should be deleted when closed.
**
** Note that we can't use the old Unix trick of opening the file
** and then immediately unlinking the file. That works great
** under Unix, but fails when we try to port to Windows.
*/
int sqliteDbbeOpenTempFile(Dbbe *pBe, FILE **ppFile){
char *zFile; /* Full name of the temporary file */
char zBuf[50]; /* Base name of the temporary file */
int i; /* Loop counter */
int limit; /* Prevent an infinite loop */
int rc = SQLITE_OK; /* Value returned by this function */
for(i=0; i<pBe->nTemp; i++){
if( pBe->apTemp[i]==0 ) break;
}
if( i>=pBe->nTemp ){
pBe->nTemp++;
pBe->apTemp = sqliteRealloc(pBe->apTemp, pBe->nTemp*sizeof(FILE*) );
pBe->azTemp = sqliteRealloc(pBe->azTemp, pBe->nTemp*sizeof(char*) );
}
if( pBe->apTemp==0 ){
*ppFile = 0;
return SQLITE_NOMEM;
}
limit = 4;
zFile = 0;
do{
randomName(&pBe->rc4, zBuf, "/_temp_file_");
sqliteFree(zFile);
zFile = 0;
sqliteSetString(&zFile, pBe->zDir, zBuf, 0);
}while( access(zFile,0)==0 && limit-- >= 0 );
*ppFile = pBe->apTemp[i] = fopen(zFile, "w+");
if( pBe->apTemp[i]==0 ){
rc = SQLITE_ERROR;
sqliteFree(zFile);
pBe->azTemp[i] = 0;
}else{
pBe->azTemp[i] = zFile;
}
return rc;
}
/*
** Close a temporary file opened using sqliteDbbeOpenTempFile()
*/
void sqliteDbbeCloseTempFile(Dbbe *pBe, FILE *f){
int i;
for(i=0; i<pBe->nTemp; i++){
if( pBe->apTemp[i]==f ){
unlink(pBe->azTemp[i]);
sqliteFree(pBe->azTemp[i]);
pBe->apTemp[i] = 0;
pBe->azTemp[i] = 0;
break;
}
}
fclose(f);
} }

143
src/dbbe.h
View File

@ -28,7 +28,7 @@
** This library was originally designed to support the following ** This library was originally designed to support the following
** backends: GDBM, NDBM, SDBM, Berkeley DB. ** backends: GDBM, NDBM, SDBM, Berkeley DB.
** **
** $Id: dbbe.h,v 1.7 2000/08/17 09:50:00 drh Exp $ ** $Id: dbbe.h,v 1.8 2000/10/19 01:49:02 drh Exp $
*/ */
#ifndef _SQLITE_DBBE_H_ #ifndef _SQLITE_DBBE_H_
#define _SQLITE_DBBE_H_ #define _SQLITE_DBBE_H_
@ -54,90 +54,99 @@
typedef struct Dbbe Dbbe; typedef struct Dbbe Dbbe;
typedef struct DbbeCursor DbbeCursor; typedef struct DbbeCursor DbbeCursor;
/*
** The 18 interface routines.
*/
/* Open a complete database */ /*
** Open a complete database.
**
** If the database name begins with "gdbm:" the GDBM driver is used.
** If the name begins with "memory:" the in-memory driver is used.
** The default driver is GDBM.
*/
Dbbe *sqliteDbbeOpen(const char *zName, int write, int create, char **pzErr); Dbbe *sqliteDbbeOpen(const char *zName, int write, int create, char **pzErr);
/* Close the whole database. */ /*
void sqliteDbbeClose(Dbbe*); ** This is the structure returned by sqliteDbbeOpen(). It contains pointers
** to all access routines for the database backend.
/* Open a cursor into particular file of a previously opened database.
** Create the file if it doesn't already exist and writeable!=0. zName
** is the base name of the file to be opened. This routine will add
** an appropriate path and extension to the filename to locate the
** actual file.
**
** If zName is 0 or "", then a temporary file is created that
** will be deleted when closed.
*/ */
int sqliteDbbeOpenCursor(Dbbe*, const char *zName, int writeable, DbbeCursor**); struct Dbbe {
/* Close the whole database. */
void (*Close)(Dbbe*);
/* Delete a table from the database */ /* Open a cursor into particular file of a previously opened database.
void sqliteDbbeDropTable(Dbbe*, const char *zTableName); ** Create the file if it doesn't already exist and writeable!=0. zName
** is the base name of the file to be opened. This routine will add
** an appropriate path and extension to the filename to locate the
** actual file.
**
** If zName is 0 or "", then a temporary file is created that
** will be deleted when closed.
*/
int (*OpenCursor)(Dbbe*, const char *zName, int writeable, DbbeCursor**);
/* Reorganize a table to speed access or reduce its disk usage */ /* Delete a table from the database */
int sqliteDbbeReorganizeTable(Dbbe*, const char *zTableName); void (*DropTable)(Dbbe*, const char *zTableName);
/* Close a cursor */ /* Reorganize a table to speed access or reduce its disk usage */
void sqliteDbbeCloseCursor(DbbeCursor*); int (*ReorganizeTable)(Dbbe*, const char *zTableName);
/* Fetch an entry from a table with the given key. Return 1 if /* Close a cursor */
** successful and 0 if no such entry exists. void (*CloseCursor)(DbbeCursor*);
*/
int sqliteDbbeFetch(DbbeCursor*, int nKey, char *pKey);
/* Return 1 if the given key is already in the table. Return 0 /* Fetch an entry from a table with the given key. Return 1 if
** if it is not. ** successful and 0 if no such entry exists.
*/ */
int sqliteDbbeTest(DbbeCursor*, int nKey, char *pKey); int (*Fetch)(DbbeCursor*, int nKey, char *pKey);
/* Retrieve the key or data used for the last fetch. Only size /* Return 1 if the given key is already in the table. Return 0
** bytes are read beginning with the offset-th byte. The return ** if it is not.
** value is the actual number of bytes read. */
*/ int (*Test)(DbbeCursor*, int nKey, char *pKey);
int sqliteDbbeCopyKey(DbbeCursor*, int offset, int size, char *zBuf);
int sqliteDbbeCopyData(DbbeCursor*, int offset, int size, char *zBuf);
/* Retrieve the key or data. The result is ephemeral. In other words, /* Retrieve the key or data used for the last fetch. Only size
** the result is stored in a buffer that might be overwritten on the next ** bytes are read beginning with the offset-th byte. The return
** call to any DBBE routine. If the results are needed for longer than ** value is the actual number of bytes read.
** that, you must make a copy. */
*/ int (*CopyKey)(DbbeCursor*, int offset, int size, char *zBuf);
char *sqliteDbbeReadKey(DbbeCursor*, int offset); int (*CopyData)(DbbeCursor*, int offset, int size, char *zBuf);
char *sqliteDbbeReadData(DbbeCursor*, int offset);
/* Return the length of the most recently fetched key or data. */ /* Retrieve the key or data. The result is ephemeral. In other words,
int sqliteDbbeKeyLength(DbbeCursor*); ** the result is stored in a buffer that might be overwritten on the next
int sqliteDbbeDataLength(DbbeCursor*); ** call to any DBBE routine. If the results are needed for longer than
** that, you must make a copy.
*/
char *(*ReadKey)(DbbeCursor*, int offset);
char *(*ReadData)(DbbeCursor*, int offset);
/* Retrieve the next entry in the table. The first key is retrieved /* Return the length of the most recently fetched key or data. */
** the first time this routine is called, or after a call to int (*KeyLength)(DbbeCursor*);
** sqliteDbbeRewind(). The return value is 1 if there is another int (*DataLength)(DbbeCursor*);
** entry, or 0 if there are no more entries. */
int sqliteDbbeNextKey(DbbeCursor*);
/* Make it so that the next call to sqliteDbbeNextKey() returns /* Retrieve the next entry in the table. The first key is retrieved
** the first entry of the table. */ ** the first time this routine is called, or after a call to
int sqliteDbbeRewind(DbbeCursor*); ** Dbbe.Rewind(). The return value is 1 if there is another
** entry, or 0 if there are no more entries. */
int (*NextKey)(DbbeCursor*);
/* Get a new integer key for this table. */ /* Make it so that the next call to Dbbe.NextKey() returns
int sqliteDbbeNew(DbbeCursor*); ** the first entry of the table. */
int (*Rewind)(DbbeCursor*);
/* Write an entry into a table. If another entry already exists with /* Get a new integer key for this table. */
** the same key, the old entry is discarded first. int (*New)(DbbeCursor*);
*/
int sqliteDbbePut(DbbeCursor*, int nKey, char *pKey, int nData, char *pData);
/* Remove an entry from the table */ /* Write an entry into a table. If another entry already exists with
int sqliteDbbeDelete(DbbeCursor*, int nKey, char *pKey); ** the same key, the old entry is discarded first.
*/
int (*Put)(DbbeCursor*, int nKey, char *pKey, int nData, char *pData);
/* Open a file suitable for temporary storage */ /* Remove an entry from the table */
int sqliteDbbeOpenTempFile(Dbbe*, FILE**); int (*Delete)(DbbeCursor*, int nKey, char *pKey);
/* Close a temporary file */ /* Open a file suitable for temporary storage */
void sqliteDbbeCloseTempFile(Dbbe *, FILE *); int (*OpenTempFile)(Dbbe*, FILE**);
/* Close a temporary file */
void (*CloseTempFile)(Dbbe *, FILE *);
};
#endif /* defined(_SQLITE_DBBE_H_) */ #endif /* defined(_SQLITE_DBBE_H_) */

776
src/dbbegdbm.c Normal file
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@ -0,0 +1,776 @@
/*
** Copyright (c) 2000 D. Richard Hipp
**
** 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 library; if not, write to the
** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
** Boston, MA 02111-1307, USA.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*************************************************************************
** This file contains code to implement the database backend (DBBE)
** for sqlite. The database backend is the interface between
** sqlite and the code that does the actually reading and writing
** of information to the disk.
**
** This file uses GDBM as the database backend. It should be
** relatively simple to convert to a different database such
** as NDBM, SDBM, or BerkeleyDB.
**
** $Id: dbbegdbm.c,v 1.1 2000/10/19 01:49:02 drh Exp $
*/
#include "sqliteInt.h"
#include <gdbm.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <time.h>
/*
** Information about each open disk file is an instance of this
** structure. There will only be one such structure for each
** disk file. If the VDBE opens the same file twice (as will happen
** for a self-join, for example) then two DbbeCursor structures are
** created but there is only a single BeFile structure with an
** nRef of 2.
*/
typedef struct BeFile BeFile;
struct BeFile {
char *zName; /* Name of the file */
GDBM_FILE dbf; /* The file itself */
int nRef; /* Number of references */
int delOnClose; /* Delete when closing */
int writeable; /* Opened for writing */
BeFile *pNext, *pPrev; /* Next and previous on list of open files */
};
/*
** The following structure holds the current state of the RC4 algorithm.
** We use RC4 as a random number generator. Each call to RC4 gives
** a random 8-bit number.
**
** Nothing in this file or anywhere else in SQLite does any kind of
** encryption. The RC4 algorithm is being used as a PRNG (pseudo-random
** number generator) not as an encryption device.
*/
struct rc4 {
int i, j;
int s[256];
};
/*
** The following structure contains all information used by GDBM
** database driver. This is a subclass of the Dbbe structure.
*/
typedef struct Dbbex Dbbex;
struct Dbbex {
Dbbe dbbe; /* The base class */
char *zDir; /* The directory containing the database */
int write; /* True for write permission */
BeFile *pOpen; /* List of open files */
int nTemp; /* Number of temporary files created */
FILE **apTemp; /* Space to hold temporary file pointers */
char **azTemp; /* Names of the temporary files */
struct rc4 rc4; /* The random number generator */
};
/*
** An cursor into a database file is an instance of the following structure.
** There can only be a single BeFile structure for each disk file, but
** there can be multiple DbbeCursor structures. Each DbbeCursor represents
** a cursor pointing to a particular part of the open BeFile. The
** BeFile.nRef field hold a count of the number of DbbeCursor structures
** associated with the same disk file.
*/
struct DbbeCursor {
Dbbex *pBe; /* The database of which this record is a part */
BeFile *pFile; /* The database file for this table */
datum key; /* Most recently used key */
datum data; /* Most recent data */
int needRewind; /* Next key should be the first */
int readPending; /* The fetch hasn't actually been done yet */
};
/*
** Initialize the RC4 PRNG. "seed" is a pointer to some random
** data used to initialize the PRNG.
*/
static void rc4init(struct rc4 *p, char *seed, int seedlen){
int i;
char k[256];
p->j = 0;
p->i = 0;
for(i=0; i<256; i++){
p->s[i] = i;
k[i] = seed[i%seedlen];
}
for(i=0; i<256; i++){
int t;
p->j = (p->j + p->s[i] + k[i]) & 0xff;
t = p->s[p->j];
p->s[p->j] = p->s[i];
p->s[i] = t;
}
}
/*
** Get a single 8-bit random value from the RC4 PRNG.
*/
static int rc4byte(struct rc4 *p){
int t;
p->i = (p->i + 1) & 0xff;
p->j = (p->j + p->s[p->i]) & 0xff;
t = p->s[p->i];
p->s[p->i] = p->s[p->j];
p->s[p->j] = t;
t = p->s[p->i] + p->s[p->j];
return t & 0xff;
}
/*
** The "mkdir()" function only takes one argument under Windows.
*/
#if OS_WIN
# define mkdir(A,B) mkdir(A)
#endif
/*
** Forward declaration
*/
static void sqliteGdbmCloseCursor(DbbeCursor *pCursr);
/*
** Completely shutdown the given database. Close all files. Free all memory.
*/
static void sqliteGdbmClose(Dbbe *pDbbe){
Dbbex *pBe = (Dbbex*)pDbbe;
BeFile *pFile, *pNext;
int i;
for(pFile=pBe->pOpen; pFile; pFile=pNext){
pNext = pFile->pNext;
gdbm_close(pFile->dbf);
memset(pFile, 0, sizeof(*pFile));
sqliteFree(pFile);
}
for(i=0; i<pBe->nTemp; i++){
if( pBe->apTemp[i]!=0 ){
unlink(pBe->azTemp[i]);
fclose(pBe->apTemp[i]);
sqliteFree(pBe->azTemp[i]);
pBe->apTemp[i] = 0;
pBe->azTemp[i] = 0;
break;
}
}
sqliteFree(pBe->azTemp);
sqliteFree(pBe->apTemp);
memset(pBe, 0, sizeof(*pBe));
sqliteFree(pBe);
}
/*
** Translate the name of an SQL table (or index) into the name
** of a file that holds the key/data pairs for that table or
** index. Space to hold the filename is obtained from
** sqliteMalloc() and must be freed by the calling function.
*/
static char *sqliteFileOfTable(Dbbex *pBe, const char *zTable){
char *zFile = 0;
int i;
sqliteSetString(&zFile, pBe->zDir, "/", zTable, ".tbl", 0);
if( zFile==0 ) return 0;
for(i=strlen(pBe->zDir)+1; zFile[i]; i++){
int c = zFile[i];
if( isupper(c) ){
zFile[i] = tolower(c);
}else if( !isalnum(c) && c!='-' && c!='_' && c!='.' ){
zFile[i] = '+';
}
}
return zFile;
}
/*
** Generate a random filename with the given prefix. The new filename
** is written into zBuf[]. The calling function must insure that
** zBuf[] is big enough to hold the prefix plus 20 or so extra
** characters.
**
** Very random names are chosen so that the chance of a
** collision with an existing filename is very very small.
*/
static void randomName(struct rc4 *pRc4, char *zBuf, char *zPrefix){
int i, j;
static const char zRandomChars[] = "abcdefghijklmnopqrstuvwxyz0123456789";
strcpy(zBuf, zPrefix);
j = strlen(zBuf);
for(i=0; i<15; i++){
int c = rc4byte(pRc4) % (sizeof(zRandomChars) - 1);
zBuf[j++] = zRandomChars[c];
}
zBuf[j] = 0;
}
/*
** Open a new table cursor. Write a pointer to the corresponding
** DbbeCursor structure into *ppCursr. Return an integer success
** code:
**
** SQLITE_OK It worked!
**
** SQLITE_NOMEM sqliteMalloc() failed
**
** SQLITE_PERM Attempt to access a file for which file
** access permission is denied
**
** SQLITE_BUSY Another thread or process is already using
** the corresponding file and has that file locked.
**
** SQLITE_READONLY The current thread already has this file open
** readonly but you are trying to open for writing.
** (This can happen if a SELECT callback tries to
** do an UPDATE or DELETE.)
**
** If zTable is 0 or "", then a temporary database file is created and
** a cursor to that temporary file is opened. The temporary file
** will be deleted from the disk when it is closed.
*/
static int sqliteGdbmOpenCursor(
Dbbe *pDbbe, /* The database the table belongs to */
const char *zTable, /* The SQL name of the file to be opened */
int writeable, /* True to open for writing */
DbbeCursor **ppCursr /* Write the resulting table pointer here */
){
char *zFile; /* Name of the table file */
DbbeCursor *pCursr; /* The new table cursor */
BeFile *pFile; /* The underlying data file for this table */
int rc = SQLITE_OK; /* Return value */
int rw_mask; /* Permissions mask for opening a table */
int mode; /* Mode for opening a table */
Dbbex *pBe = (Dbbex*)pDbbe;
*ppCursr = 0;
pCursr = sqliteMalloc( sizeof(*pCursr) );
if( pCursr==0 ) return SQLITE_NOMEM;
if( zTable ){
zFile = sqliteFileOfTable(pBe, zTable);
for(pFile=pBe->pOpen; pFile; pFile=pFile->pNext){
if( strcmp(pFile->zName,zFile)==0 ) break;
}
}else{
pFile = 0;
zFile = 0;
}
if( pFile==0 ){
if( writeable ){
rw_mask = GDBM_WRCREAT | GDBM_FAST;
mode = 0640;
}else{
rw_mask = GDBM_READER;
mode = 0640;
}
pFile = sqliteMalloc( sizeof(*pFile) );
if( pFile==0 ){
sqliteFree(zFile);
return SQLITE_NOMEM;
}
if( zFile ){
if( !writeable || pBe->write ){
pFile->dbf = gdbm_open(zFile, 0, rw_mask, mode, 0);
}else{
pFile->dbf = 0;
}
}else{
int limit;
struct rc4 *pRc4;
char zRandom[50];
pRc4 = &pBe->rc4;
zFile = 0;
limit = 5;
do {
randomName(&pBe->rc4, zRandom, "_temp_table_");
sqliteFree(zFile);
zFile = sqliteFileOfTable(pBe, zRandom);
pFile->dbf = gdbm_open(zFile, 0, rw_mask, mode, 0);
}while( pFile->dbf==0 && limit-- >= 0);
pFile->delOnClose = 1;
}
pFile->writeable = writeable;
pFile->zName = zFile;
pFile->nRef = 1;
pFile->pPrev = 0;
if( pBe->pOpen ){
pBe->pOpen->pPrev = pFile;
}
pFile->pNext = pBe->pOpen;
pBe->pOpen = pFile;
if( pFile->dbf==0 ){
if( !writeable && access(zFile,0) ){
/* Trying to read a non-existant file. This is OK. All the
** reads will return empty, which is what we want. */
rc = SQLITE_OK;
}else if( pBe->write==0 ){
rc = SQLITE_READONLY;
}else if( access(zFile,W_OK|R_OK) ){
rc = SQLITE_PERM;
}else{
rc = SQLITE_BUSY;
}
}
}else{
sqliteFree(zFile);
pFile->nRef++;
if( writeable && !pFile->writeable ){
rc = SQLITE_READONLY;
}
}
pCursr->pBe = pBe;
pCursr->pFile = pFile;
pCursr->readPending = 0;
pCursr->needRewind = 1;
if( rc!=SQLITE_OK ){
sqliteGdbmCloseCursor(pCursr);
*ppCursr = 0;
}else{
*ppCursr = pCursr;
}
return rc;
}
/*
** Drop a table from the database. The file on the disk that corresponds
** to this table is deleted.
*/
static void sqliteGdbmDropTable(Dbbe *pBe, const char *zTable){
char *zFile; /* Name of the table file */
zFile = sqliteFileOfTable((Dbbex*)pBe, zTable);
unlink(zFile);
sqliteFree(zFile);
}
/*
** Close a cursor previously opened by sqliteGdbmOpenCursor().
**
** There can be multiple cursors pointing to the same open file.
** The underlying file is not closed until all cursors have been
** closed. This routine decrements the BeFile.nref field of the
** underlying file and closes the file when nref reaches 0.
*/
static void sqliteGdbmCloseCursor(DbbeCursor *pCursr){
BeFile *pFile;
Dbbex *pBe;
if( pCursr==0 ) return;
pFile = pCursr->pFile;
pBe = pCursr->pBe;
pFile->nRef--;
if( pFile->dbf!=NULL ){
gdbm_sync(pFile->dbf);
}
if( pFile->nRef<=0 ){
if( pFile->dbf!=NULL ){
gdbm_close(pFile->dbf);
}
if( pFile->pPrev ){
pFile->pPrev->pNext = pFile->pNext;
}else{
pBe->pOpen = pFile->pNext;
}
if( pFile->pNext ){
pFile->pNext->pPrev = pFile->pPrev;
}
if( pFile->delOnClose ){
unlink(pFile->zName);
}
sqliteFree(pFile->zName);
memset(pFile, 0, sizeof(*pFile));
sqliteFree(pFile);
}
if( pCursr->key.dptr ) free(pCursr->key.dptr);
if( pCursr->data.dptr ) free(pCursr->data.dptr);
memset(pCursr, 0, sizeof(*pCursr));
sqliteFree(pCursr);
}
/*
** Reorganize a table to reduce search times and disk usage.
*/
static int sqliteGdbmReorganizeTable(Dbbe *pBe, const char *zTable){
DbbeCursor *pCrsr;
int rc;
rc = sqliteGdbmOpenCursor(pBe, zTable, 1, &pCrsr);
if( rc!=SQLITE_OK ){
return rc;
}
if( pCrsr && pCrsr->pFile && pCrsr->pFile->dbf ){
gdbm_reorganize(pCrsr->pFile->dbf);
}
if( pCrsr ){
sqliteGdbmCloseCursor(pCrsr);
}
return SQLITE_OK;
}
/*
** Clear the given datum
*/
static void datumClear(datum *p){
if( p->dptr ) free(p->dptr);
p->dptr = 0;
p->dsize = 0;
}
/*
** Fetch a single record from an open cursor. Return 1 on success
** and 0 on failure.
*/
static int sqliteGdbmFetch(DbbeCursor *pCursr, int nKey, char *pKey){
datum key;
key.dsize = nKey;
key.dptr = pKey;
datumClear(&pCursr->key);
datumClear(&pCursr->data);
if( pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, key);
}
return pCursr->data.dptr!=0;
}
/*
** Return 1 if the given key is already in the table. Return 0
** if it is not.
*/
static int sqliteGdbmTest(DbbeCursor *pCursr, int nKey, char *pKey){
datum key;
int result = 0;
key.dsize = nKey;
key.dptr = pKey;
if( pCursr->pFile && pCursr->pFile->dbf ){
result = gdbm_exists(pCursr->pFile->dbf, key);
}
return result;
}
/*
** Copy bytes from the current key or data into a buffer supplied by
** the calling function. Return the number of bytes copied.
*/
static
int sqliteGdbmCopyKey(DbbeCursor *pCursr, int offset, int size, char *zBuf){
int n;
if( offset>=pCursr->key.dsize ) return 0;
if( offset+size>pCursr->key.dsize ){
n = pCursr->key.dsize - offset;
}else{
n = size;
}
memcpy(zBuf, &pCursr->key.dptr[offset], n);
return n;
}
static
int sqliteGdbmCopyData(DbbeCursor *pCursr, int offset, int size, char *zBuf){
int n;
if( pCursr->readPending && pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, pCursr->key);
pCursr->readPending = 0;
}
if( offset>=pCursr->data.dsize ) return 0;
if( offset+size>pCursr->data.dsize ){
n = pCursr->data.dsize - offset;
}else{
n = size;
}
memcpy(zBuf, &pCursr->data.dptr[offset], n);
return n;
}
/*
** Return a pointer to bytes from the key or data. The data returned
** is ephemeral.
*/
static char *sqliteGdbmReadKey(DbbeCursor *pCursr, int offset){
if( offset<0 || offset>=pCursr->key.dsize ) return "";
return &pCursr->key.dptr[offset];
}
static char *sqliteGdbmReadData(DbbeCursor *pCursr, int offset){
if( pCursr->readPending && pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, pCursr->key);
pCursr->readPending = 0;
}
if( offset<0 || offset>=pCursr->data.dsize ) return "";
return &pCursr->data.dptr[offset];
}
/*
** Return the total number of bytes in either data or key.
*/
static int sqliteGdbmKeyLength(DbbeCursor *pCursr){
return pCursr->key.dsize;
}
static int sqliteGdbmDataLength(DbbeCursor *pCursr){
if( pCursr->readPending && pCursr->pFile && pCursr->pFile->dbf ){
pCursr->data = gdbm_fetch(pCursr->pFile->dbf, pCursr->key);
pCursr->readPending = 0;
}
return pCursr->data.dsize;
}
/*
** Make is so that the next call to sqliteNextKey() finds the first
** key of the table.
*/
static int sqliteGdbmRewind(DbbeCursor *pCursr){
pCursr->needRewind = 1;
return SQLITE_OK;
}
/*
** Read the next key from the table. Return 1 on success. Return
** 0 if there are no more keys.
*/
static int sqliteGdbmNextKey(DbbeCursor *pCursr){
datum nextkey;
int rc;
if( pCursr==0 || pCursr->pFile==0 || pCursr->pFile->dbf==0 ){
pCursr->readPending = 0;
return 0;
}
if( pCursr->needRewind ){
nextkey = gdbm_firstkey(pCursr->pFile->dbf);
pCursr->needRewind = 0;
}else{
nextkey = gdbm_nextkey(pCursr->pFile->dbf, pCursr->key);
}
datumClear(&pCursr->key);
datumClear(&pCursr->data);
pCursr->key = nextkey;
if( pCursr->key.dptr ){
pCursr->readPending = 1;
rc = 1;
}else{
pCursr->needRewind = 1;
pCursr->readPending = 0;
rc = 0;
}
return rc;
}
/*
** Get a new integer key.
*/
static int sqliteGdbmNew(DbbeCursor *pCursr){
int iKey;
datum key;
int go = 1;
int i;
struct rc4 *pRc4;
if( pCursr->pFile==0 || pCursr->pFile->dbf==0 ) return 1;
pRc4 = &pCursr->pBe->rc4;
while( go ){
iKey = 0;
for(i=0; i<4; i++){
iKey = (iKey<<8) + rc4byte(pRc4);
}
if( iKey==0 ) continue;
key.dptr = (char*)&iKey;
key.dsize = 4;
go = gdbm_exists(pCursr->pFile->dbf, key);
}
return iKey;
}
/*
** Write an entry into the table. Overwrite any prior entry with the
** same key.
*/
static int
sqliteGdbmPut(DbbeCursor *pCursr, int nKey,char *pKey,int nData,char *pData){
datum data, key;
int rc;
if( pCursr->pFile==0 || pCursr->pFile->dbf==0 ) return SQLITE_ERROR;
data.dsize = nData;
data.dptr = pData;
key.dsize = nKey;
key.dptr = pKey;
rc = gdbm_store(pCursr->pFile->dbf, key, data, GDBM_REPLACE);
if( rc ) rc = SQLITE_ERROR;
datumClear(&pCursr->key);
datumClear(&pCursr->data);
return rc;
}
/*
** Remove an entry from a table, if the entry exists.
*/
static int sqliteGdbmDelete(DbbeCursor *pCursr, int nKey, char *pKey){
datum key;
int rc;
datumClear(&pCursr->key);
datumClear(&pCursr->data);
if( pCursr->pFile==0 || pCursr->pFile->dbf==0 ) return SQLITE_ERROR;
key.dsize = nKey;
key.dptr = pKey;
rc = gdbm_delete(pCursr->pFile->dbf, key);
if( rc ) rc = SQLITE_ERROR;
return rc;
}
/*
** Open a temporary file. The file should be deleted when closed.
**
** Note that we can't use the old Unix trick of opening the file
** and then immediately unlinking the file. That works great
** under Unix, but fails when we try to port to Windows.
*/
static int sqliteGdbmOpenTempFile(Dbbe *pDbbe, FILE **ppFile){
char *zFile; /* Full name of the temporary file */
char zBuf[50]; /* Base name of the temporary file */
int i; /* Loop counter */
int limit; /* Prevent an infinite loop */
int rc = SQLITE_OK; /* Value returned by this function */
Dbbex *pBe = (Dbbex*)pDbbe;
for(i=0; i<pBe->nTemp; i++){
if( pBe->apTemp[i]==0 ) break;
}
if( i>=pBe->nTemp ){
pBe->nTemp++;
pBe->apTemp = sqliteRealloc(pBe->apTemp, pBe->nTemp*sizeof(FILE*) );
pBe->azTemp = sqliteRealloc(pBe->azTemp, pBe->nTemp*sizeof(char*) );
}
if( pBe->apTemp==0 ){
*ppFile = 0;
return SQLITE_NOMEM;
}
limit = 4;
zFile = 0;
do{
randomName(&pBe->rc4, zBuf, "/_temp_file_");
sqliteFree(zFile);
zFile = 0;
sqliteSetString(&zFile, pBe->zDir, zBuf, 0);
}while( access(zFile,0)==0 && limit-- >= 0 );
*ppFile = pBe->apTemp[i] = fopen(zFile, "w+");
if( pBe->apTemp[i]==0 ){
rc = SQLITE_ERROR;
sqliteFree(zFile);
pBe->azTemp[i] = 0;
}else{
pBe->azTemp[i] = zFile;
}
return rc;
}
/*
** Close a temporary file opened using sqliteGdbmOpenTempFile()
*/
static void sqliteGdbmCloseTempFile(Dbbe *pDbbe, FILE *f){
int i;
Dbbex *pBe = (Dbbex*)pDbbe;
for(i=0; i<pBe->nTemp; i++){
if( pBe->apTemp[i]==f ){
unlink(pBe->azTemp[i]);
sqliteFree(pBe->azTemp[i]);
pBe->apTemp[i] = 0;
pBe->azTemp[i] = 0;
break;
}
}
fclose(f);
}
/*
** This routine opens a new database. For the GDBM driver
** implemented here, the database name is the name of the directory
** containing all the files of the database.
**
** If successful, a pointer to the Dbbe structure is returned.
** If there are errors, an appropriate error message is left
** in *pzErrMsg and NULL is returned.
*/
Dbbe *sqliteGdbmOpen(
const char *zName, /* The name of the database */
int writeFlag, /* True if we will be writing to the database */
int createFlag, /* True to create database if it doesn't exist */
char **pzErrMsg /* Write error messages (if any) here */
){
Dbbex *pNew;
struct stat statbuf;
char *zMaster;
if( !writeFlag ) createFlag = 0;
if( stat(zName, &statbuf)!=0 ){
if( createFlag ) mkdir(zName, 0750);
if( stat(zName, &statbuf)!=0 ){
sqliteSetString(pzErrMsg, createFlag ?
"can't find or create directory \"" : "can't find directory \"",
zName, "\"", 0);
return 0;
}
}
if( !S_ISDIR(statbuf.st_mode) ){
sqliteSetString(pzErrMsg, "not a directory: \"", zName, "\"", 0);
return 0;
}
if( access(zName, writeFlag ? (X_OK|W_OK|R_OK) : (X_OK|R_OK)) ){
sqliteSetString(pzErrMsg, "access permission denied", 0);
return 0;
}
zMaster = 0;
sqliteSetString(&zMaster, zName, "/" MASTER_NAME ".tbl", 0);
if( stat(zMaster, &statbuf)==0
&& access(zMaster, writeFlag ? (W_OK|R_OK) : R_OK)!=0 ){
sqliteSetString(pzErrMsg, "access permission denied for ", zMaster, 0);
sqliteFree(zMaster);
return 0;
}
sqliteFree(zMaster);
pNew = sqliteMalloc(sizeof(Dbbex) + strlen(zName) + 1);
if( pNew==0 ){
sqliteSetString(pzErrMsg, "out of memory", 0);
return 0;
}
pNew->dbbe.Close = sqliteGdbmClose;
pNew->dbbe.OpenCursor = sqliteGdbmOpenCursor;
pNew->dbbe.DropTable = sqliteGdbmDropTable;
pNew->dbbe.ReorganizeTable = sqliteGdbmReorganizeTable;
pNew->dbbe.CloseCursor = sqliteGdbmCloseCursor;
pNew->dbbe.Fetch = sqliteGdbmFetch;
pNew->dbbe.Test = sqliteGdbmTest;
pNew->dbbe.CopyKey = sqliteGdbmCopyKey;
pNew->dbbe.CopyData = sqliteGdbmCopyData;
pNew->dbbe.ReadKey = sqliteGdbmReadKey;
pNew->dbbe.ReadData = sqliteGdbmReadData;
pNew->dbbe.KeyLength = sqliteGdbmKeyLength;
pNew->dbbe.DataLength = sqliteGdbmDataLength;
pNew->dbbe.NextKey = sqliteGdbmNextKey;
pNew->dbbe.Rewind = sqliteGdbmRewind;
pNew->dbbe.New = sqliteGdbmNew;
pNew->dbbe.Put = sqliteGdbmPut;
pNew->dbbe.Delete = sqliteGdbmDelete;
pNew->dbbe.OpenTempFile = sqliteGdbmOpenTempFile;
pNew->dbbe.CloseTempFile = sqliteGdbmCloseTempFile;
pNew->zDir = (char*)&pNew[1];
strcpy(pNew->zDir, zName);
pNew->write = writeFlag;
pNew->pOpen = 0;
time(&statbuf.st_ctime);
rc4init(&pNew->rc4, (char*)&statbuf, sizeof(statbuf));
return &pNew->dbbe;
}

4
src/main.c
View File

@ -26,7 +26,7 @@
** other files are for internal use by SQLite and should not be ** other files are for internal use by SQLite and should not be
** accessed by users of the library. ** accessed by users of the library.
** **
** $Id: main.c,v 1.20 2000/10/16 22:06:42 drh Exp $ ** $Id: main.c,v 1.21 2000/10/19 01:49:02 drh Exp $
*/ */
#include "sqliteInt.h" #include "sqliteInt.h"
@ -239,7 +239,7 @@ sqlite *sqlite_open(const char *zFilename, int mode, char **pzErrMsg){
*/ */
void sqlite_close(sqlite *db){ void sqlite_close(sqlite *db){
int i; int i;
sqliteDbbeClose(db->pBe); db->pBe->Close(db->pBe);
for(i=0; i<N_HASH; i++){ for(i=0; i<N_HASH; i++){
Table *pNext, *pList = db->apTblHash[i]; Table *pNext, *pList = db->apTblHash[i];
db->apTblHash[i] = 0; db->apTblHash[i] = 0;

89
src/vdbe.c
View File

@ -41,7 +41,7 @@
** But other routines are also provided to help in building up ** But other routines are also provided to help in building up
** a program instruction by instruction. ** a program instruction by instruction.
** **
** $Id: vdbe.c,v 1.43 2000/10/16 22:06:43 drh Exp $ ** $Id: vdbe.c,v 1.44 2000/10/19 01:49:03 drh Exp $
*/ */
#include "sqliteInt.h" #include "sqliteInt.h"
#include <unistd.h> #include <unistd.h>
@ -679,7 +679,7 @@ static void Cleanup(Vdbe *p){
p->azColName = 0; p->azColName = 0;
for(i=0; i<p->nCursor; i++){ for(i=0; i<p->nCursor; i++){
if( p->aCsr[i].pCursor ){ if( p->aCsr[i].pCursor ){
sqliteDbbeCloseCursor(p->aCsr[i].pCursor); p->pBe->CloseCursor(p->aCsr[i].pCursor);
p->aCsr[i].pCursor = 0; p->aCsr[i].pCursor = 0;
} }
} }
@ -696,7 +696,7 @@ static void Cleanup(Vdbe *p){
p->nMem = 0; p->nMem = 0;
for(i=0; i<p->nList; i++){ for(i=0; i<p->nList; i++){
if( p->apList[i] ){ if( p->apList[i] ){
sqliteDbbeCloseTempFile(p->pBe, p->apList[i]); p->pBe->CloseTempFile(p->pBe, p->apList[i]);
p->apList[i] = 0; p->apList[i] = 0;
} }
} }
@ -924,6 +924,7 @@ int sqliteVdbeExec(
int pc; /* The program counter */ int pc; /* The program counter */
Op *pOp; /* Current operation */ Op *pOp; /* Current operation */
int rc; /* Value to return */ int rc; /* Value to return */
Dbbe *pBe = p->pBe; /* The backend driver */
char zBuf[100]; /* Space to sprintf() and integer */ char zBuf[100]; /* Space to sprintf() and integer */
p->tos = -1; p->tos = -1;
@ -1762,10 +1763,10 @@ int sqliteVdbeExec(
for(j=p->nCursor; j<=i; j++) p->aCsr[j].pCursor = 0; for(j=p->nCursor; j<=i; j++) p->aCsr[j].pCursor = 0;
p->nCursor = i+1; p->nCursor = i+1;
}else if( p->aCsr[i].pCursor ){ }else if( p->aCsr[i].pCursor ){
sqliteDbbeCloseCursor(p->aCsr[i].pCursor); pBe->CloseCursor(p->aCsr[i].pCursor);
} }
do { do {
rc = sqliteDbbeOpenCursor(p->pBe,pOp->p3,pOp->p2,&p->aCsr[i].pCursor); rc = pBe->OpenCursor(pBe,pOp->p3,pOp->p2,&p->aCsr[i].pCursor);
switch( rc ){ switch( rc ){
case SQLITE_BUSY: { case SQLITE_BUSY: {
if( xBusy==0 || (*xBusy)(pBusyArg, pOp->p3, ++busy)==0 ){ if( xBusy==0 || (*xBusy)(pBusyArg, pOp->p3, ++busy)==0 ){
@ -1806,7 +1807,7 @@ int sqliteVdbeExec(
case OP_Close: { case OP_Close: {
int i = pOp->p1; int i = pOp->p1;
if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor ){ if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor ){
sqliteDbbeCloseCursor(p->aCsr[i].pCursor); pBe->CloseCursor(p->aCsr[i].pCursor);
p->aCsr[i].pCursor = 0; p->aCsr[i].pCursor = 0;
} }
break; break;
@ -1824,11 +1825,11 @@ int sqliteVdbeExec(
if( tos<0 ) goto not_enough_stack; if( tos<0 ) goto not_enough_stack;
if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor ){ if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor ){
if( p->aStack[tos].flags & STK_Int ){ if( p->aStack[tos].flags & STK_Int ){
sqliteDbbeFetch(p->aCsr[i].pCursor, sizeof(int), pBe->Fetch(p->aCsr[i].pCursor, sizeof(int),
(char*)&p->aStack[tos].i); (char*)&p->aStack[tos].i);
}else{ }else{
if( Stringify(p, tos) ) goto no_mem; if( Stringify(p, tos) ) goto no_mem;
sqliteDbbeFetch(p->aCsr[i].pCursor, p->aStack[tos].n, pBe->Fetch(p->aCsr[i].pCursor, p->aStack[tos].n,
p->zStack[tos]); p->zStack[tos]);
} }
p->nFetch++; p->nFetch++;
@ -1890,11 +1891,11 @@ int sqliteVdbeExec(
if( tos<0 ) goto not_enough_stack; if( tos<0 ) goto not_enough_stack;
if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor ){ if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor ){
if( p->aStack[tos].flags & STK_Int ){ if( p->aStack[tos].flags & STK_Int ){
alreadyExists = sqliteDbbeTest(p->aCsr[i].pCursor, sizeof(int), alreadyExists = pBe->Test(p->aCsr[i].pCursor, sizeof(int),
(char*)&p->aStack[tos].i); (char*)&p->aStack[tos].i);
}else{ }else{
if( Stringify(p, tos) ) goto no_mem; if( Stringify(p, tos) ) goto no_mem;
alreadyExists = sqliteDbbeTest(p->aCsr[i].pCursor,p->aStack[tos].n, alreadyExists = pBe->Test(p->aCsr[i].pCursor,p->aStack[tos].n,
p->zStack[tos]); p->zStack[tos]);
} }
} }
@ -1920,7 +1921,7 @@ int sqliteVdbeExec(
if( i<0 || i>=p->nCursor || p->aCsr[i].pCursor==0 ){ if( i<0 || i>=p->nCursor || p->aCsr[i].pCursor==0 ){
v = 0; v = 0;
}else{ }else{
v = sqliteDbbeNew(p->aCsr[i].pCursor); v = pBe->New(p->aCsr[i].pCursor);
} }
NeedStack(p, p->tos+1); NeedStack(p, p->tos+1);
p->tos++; p->tos++;
@ -1953,7 +1954,7 @@ int sqliteVdbeExec(
nKey = sizeof(int); nKey = sizeof(int);
zKey = (char*)&p->aStack[nos].i; zKey = (char*)&p->aStack[nos].i;
} }
sqliteDbbePut(p->aCsr[i].pCursor, nKey, zKey, pBe->Put(p->aCsr[i].pCursor, nKey, zKey,
p->aStack[tos].n, p->zStack[tos]); p->aStack[tos].n, p->zStack[tos]);
} }
PopStack(p, 2); PopStack(p, 2);
@ -1980,7 +1981,7 @@ int sqliteVdbeExec(
nKey = p->aStack[tos].n; nKey = p->aStack[tos].n;
zKey = p->zStack[tos]; zKey = p->zStack[tos];
} }
sqliteDbbeDelete(p->aCsr[i].pCursor, nKey, zKey); pBe->Delete(p->aCsr[i].pCursor, nKey, zKey);
} }
PopStack(p, 1); PopStack(p, 1);
break; break;
@ -2034,29 +2035,29 @@ int sqliteVdbeExec(
if( NeedStack(p, tos) ) goto no_mem; if( NeedStack(p, tos) ) goto no_mem;
if( i>=0 && i<p->nCursor && (pCrsr = p->aCsr[i].pCursor)!=0 ){ if( i>=0 && i<p->nCursor && (pCrsr = p->aCsr[i].pCursor)!=0 ){
if( p->aCsr[i].keyAsData ){ if( p->aCsr[i].keyAsData ){
amt = sqliteDbbeKeyLength(pCrsr); amt = pBe->KeyLength(pCrsr);
if( amt<=sizeof(int)*(p2+1) ){ if( amt<=sizeof(int)*(p2+1) ){
p->aStack[tos].flags = STK_Null; p->aStack[tos].flags = STK_Null;
break; break;
} }
pAddr = (int*)sqliteDbbeReadKey(pCrsr, sizeof(int)*p2); pAddr = (int*)pBe->ReadKey(pCrsr, sizeof(int)*p2);
if( *pAddr==0 ){ if( *pAddr==0 ){
p->aStack[tos].flags = STK_Null; p->aStack[tos].flags = STK_Null;
break; break;
} }
z = sqliteDbbeReadKey(pCrsr, *pAddr); z = pBe->ReadKey(pCrsr, *pAddr);
}else{ }else{
amt = sqliteDbbeDataLength(pCrsr); amt = pBe->DataLength(pCrsr);
if( amt<=sizeof(int)*(p2+1) ){ if( amt<=sizeof(int)*(p2+1) ){
p->aStack[tos].flags = STK_Null; p->aStack[tos].flags = STK_Null;
break; break;
} }
pAddr = (int*)sqliteDbbeReadData(pCrsr, sizeof(int)*p2); pAddr = (int*)pBe->ReadData(pCrsr, sizeof(int)*p2);
if( *pAddr==0 ){ if( *pAddr==0 ){
p->aStack[tos].flags = STK_Null; p->aStack[tos].flags = STK_Null;
break; break;
} }
z = sqliteDbbeReadData(pCrsr, *pAddr); z = pBe->ReadData(pCrsr, *pAddr);
} }
p->zStack[tos] = z; p->zStack[tos] = z;
p->aStack[tos].n = strlen(z) + 1; p->aStack[tos].n = strlen(z) + 1;
@ -2079,11 +2080,11 @@ int sqliteVdbeExec(
if( NeedStack(p, p->tos) ) goto no_mem; if( NeedStack(p, p->tos) ) goto no_mem;
if( i>=0 && i<p->nCursor && (pCrsr = p->aCsr[i].pCursor)!=0 ){ if( i>=0 && i<p->nCursor && (pCrsr = p->aCsr[i].pCursor)!=0 ){
char *z = sqliteDbbeReadKey(pCrsr, 0); char *z = pBe->ReadKey(pCrsr, 0);
if( p->aCsr[i].keyAsData ){ if( p->aCsr[i].keyAsData ){
p->zStack[tos] = z; p->zStack[tos] = z;
p->aStack[tos].flags = STK_Str; p->aStack[tos].flags = STK_Str;
p->aStack[tos].n = sqliteDbbeKeyLength(pCrsr); p->aStack[tos].n = pBe->KeyLength(pCrsr);
}else{ }else{
memcpy(&p->aStack[tos].i, z, sizeof(int)); memcpy(&p->aStack[tos].i, z, sizeof(int));
p->aStack[tos].flags = STK_Int; p->aStack[tos].flags = STK_Int;
@ -2100,7 +2101,7 @@ int sqliteVdbeExec(
case OP_Rewind: { case OP_Rewind: {
int i = pOp->p1; int i = pOp->p1;
if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor!=0 ){ if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor!=0 ){
sqliteDbbeRewind(p->aCsr[i].pCursor); pBe->Rewind(p->aCsr[i].pCursor);
} }
break; break;
} }
@ -2113,7 +2114,7 @@ int sqliteVdbeExec(
case OP_Next: { case OP_Next: {
int i = pOp->p1; int i = pOp->p1;
if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor!=0 ){ if( i>=0 && i<p->nCursor && p->aCsr[i].pCursor!=0 ){
if( sqliteDbbeNextKey(p->aCsr[i].pCursor)==0 ){ if( pBe->NextKey(p->aCsr[i].pCursor)==0 ){
pc = pOp->p2 - 1; pc = pOp->p2 - 1;
}else{ }else{
p->nFetch++; p->nFetch++;
@ -2163,8 +2164,8 @@ int sqliteVdbeExec(
int *aIdx; int *aIdx;
int nIdx; int nIdx;
int j, k; int j, k;
nIdx = sqliteDbbeDataLength(pCrsr)/sizeof(int); nIdx = pBe->DataLength(pCrsr)/sizeof(int);
aIdx = (int*)sqliteDbbeReadData(pCrsr, 0); aIdx = (int*)pBe->ReadData(pCrsr, 0);
if( nIdx>1 ){ if( nIdx>1 ){
k = *(aIdx++); k = *(aIdx++);
if( k>nIdx-1 ) k = nIdx-1; if( k>nIdx-1 ) k = nIdx-1;
@ -2209,10 +2210,10 @@ int sqliteVdbeExec(
Integerify(p, nos); Integerify(p, nos);
newVal = p->aStack[nos].i; newVal = p->aStack[nos].i;
if( Stringify(p, tos) ) goto no_mem; if( Stringify(p, tos) ) goto no_mem;
r = sqliteDbbeFetch(pCrsr, p->aStack[tos].n, p->zStack[tos]); r = pBe->Fetch(pCrsr, p->aStack[tos].n, p->zStack[tos]);
if( r==0 ){ if( r==0 ){
/* Create a new record for this index */ /* Create a new record for this index */
sqliteDbbePut(pCrsr, p->aStack[tos].n, p->zStack[tos], pBe->Put(pCrsr, p->aStack[tos].n, p->zStack[tos],
sizeof(int), (char*)&newVal); sizeof(int), (char*)&newVal);
}else{ }else{
/* Extend the existing record */ /* Extend the existing record */
@ -2220,32 +2221,32 @@ int sqliteVdbeExec(
int *aIdx; int *aIdx;
int k; int k;
nIdx = sqliteDbbeDataLength(pCrsr)/sizeof(int); nIdx = pBe->DataLength(pCrsr)/sizeof(int);
if( nIdx==1 ){ if( nIdx==1 ){
aIdx = sqliteMalloc( sizeof(int)*4 ); aIdx = sqliteMalloc( sizeof(int)*4 );
if( aIdx==0 ) goto no_mem; if( aIdx==0 ) goto no_mem;
aIdx[0] = 2; aIdx[0] = 2;
sqliteDbbeCopyData(pCrsr, 0, sizeof(int), (char*)&aIdx[1]); pBe->CopyData(pCrsr, 0, sizeof(int), (char*)&aIdx[1]);
aIdx[2] = newVal; aIdx[2] = newVal;
sqliteDbbePut(pCrsr, p->aStack[tos].n, p->zStack[tos], pBe->Put(pCrsr, p->aStack[tos].n, p->zStack[tos],
sizeof(int)*4, (char*)aIdx); sizeof(int)*4, (char*)aIdx);
sqliteFree(aIdx); sqliteFree(aIdx);
}else{ }else{
aIdx = (int*)sqliteDbbeReadData(pCrsr, 0); aIdx = (int*)pBe->ReadData(pCrsr, 0);
k = aIdx[0]; k = aIdx[0];
if( k<nIdx-1 ){ if( k<nIdx-1 ){
aIdx[k+1] = newVal; aIdx[k+1] = newVal;
aIdx[0]++; aIdx[0]++;
sqliteDbbePut(pCrsr, p->aStack[tos].n, p->zStack[tos], pBe->Put(pCrsr, p->aStack[tos].n, p->zStack[tos],
sizeof(int)*nIdx, (char*)aIdx); sizeof(int)*nIdx, (char*)aIdx);
}else{ }else{
nIdx *= 2; nIdx *= 2;
aIdx = sqliteMalloc( sizeof(int)*nIdx ); aIdx = sqliteMalloc( sizeof(int)*nIdx );
if( aIdx==0 ) goto no_mem; if( aIdx==0 ) goto no_mem;
sqliteDbbeCopyData(pCrsr, 0, sizeof(int)*(k+1), (char*)aIdx); pBe->CopyData(pCrsr, 0, sizeof(int)*(k+1), (char*)aIdx);
aIdx[k+1] = newVal; aIdx[k+1] = newVal;
aIdx[0]++; aIdx[0]++;
sqliteDbbePut(pCrsr, p->aStack[tos].n, p->zStack[tos], pBe->Put(pCrsr, p->aStack[tos].n, p->zStack[tos],
sizeof(int)*nIdx, (char*)aIdx); sizeof(int)*nIdx, (char*)aIdx);
sqliteFree(aIdx); sqliteFree(aIdx);
} }
@ -2284,12 +2285,12 @@ int sqliteVdbeExec(
Integerify(p, nos); Integerify(p, nos);
oldVal = p->aStack[nos].i; oldVal = p->aStack[nos].i;
if( Stringify(p, tos) ) goto no_mem; if( Stringify(p, tos) ) goto no_mem;
r = sqliteDbbeFetch(pCrsr, p->aStack[tos].n, p->zStack[tos]); r = pBe->Fetch(pCrsr, p->aStack[tos].n, p->zStack[tos]);
if( r==0 ) break; if( r==0 ) break;
nIdx = sqliteDbbeDataLength(pCrsr)/sizeof(int); nIdx = pBe->DataLength(pCrsr)/sizeof(int);
aIdx = (int*)sqliteDbbeReadData(pCrsr, 0); aIdx = (int*)pBe->ReadData(pCrsr, 0);
if( (nIdx==1 && aIdx[0]==oldVal) || (aIdx[0]==1 && aIdx[1]==oldVal) ){ if( (nIdx==1 && aIdx[0]==oldVal) || (aIdx[0]==1 && aIdx[1]==oldVal) ){
sqliteDbbeDelete(pCrsr, p->aStack[tos].n, p->zStack[tos]); pBe->Delete(pCrsr, p->aStack[tos].n, p->zStack[tos]);
}else{ }else{
k = aIdx[0]; k = aIdx[0];
for(j=1; j<=k && aIdx[j]!=oldVal; j++){} for(j=1; j<=k && aIdx[j]!=oldVal; j++){}
@ -2300,7 +2301,7 @@ int sqliteVdbeExec(
if( aIdx[0]*3 + 1 < nIdx ){ if( aIdx[0]*3 + 1 < nIdx ){
nIdx /= 2; nIdx /= 2;
} }
sqliteDbbePut(pCrsr, p->aStack[tos].n, p->zStack[tos], pBe->Put(pCrsr, p->aStack[tos].n, p->zStack[tos],
sizeof(int)*nIdx, (char*)aIdx); sizeof(int)*nIdx, (char*)aIdx);
} }
} }
@ -2315,7 +2316,7 @@ int sqliteVdbeExec(
** from the disk. ** from the disk.
*/ */
case OP_Destroy: { case OP_Destroy: {
sqliteDbbeDropTable(p->pBe, pOp->p3); pBe->DropTable(pBe, pOp->p3);
break; break;
} }
@ -2324,7 +2325,7 @@ int sqliteVdbeExec(
** Compress, optimize, and tidy up the GDBM file named by P3. ** Compress, optimize, and tidy up the GDBM file named by P3.
*/ */
case OP_Reorganize: { case OP_Reorganize: {
sqliteDbbeReorganizeTable(p->pBe, pOp->p3); pBe->ReorganizeTable(pBe, pOp->p3);
break; break;
} }
@ -2346,9 +2347,9 @@ int sqliteVdbeExec(
for(j=p->nList; j<=i; j++) p->apList[j] = 0; for(j=p->nList; j<=i; j++) p->apList[j] = 0;
p->nList = i+1; p->nList = i+1;
}else if( p->apList[i] ){ }else if( p->apList[i] ){
sqliteDbbeCloseTempFile(p->pBe, p->apList[i]); pBe->CloseTempFile(pBe, p->apList[i]);
} }
rc = sqliteDbbeOpenTempFile(p->pBe, &p->apList[i]); rc = pBe->OpenTempFile(pBe, &p->apList[i]);
if( rc!=SQLITE_OK ){ if( rc!=SQLITE_OK ){
sqliteSetString(pzErrMsg, "unable to open a temporary file", 0); sqliteSetString(pzErrMsg, "unable to open a temporary file", 0);
} }
@ -2418,7 +2419,7 @@ int sqliteVdbeExec(
int i = pOp->p1; int i = pOp->p1;
if( i<0 ) goto bad_instruction; if( i<0 ) goto bad_instruction;
if( i<p->nList && p->apList[i]!=0 ){ if( i<p->nList && p->apList[i]!=0 ){
sqliteDbbeCloseTempFile(p->pBe, p->apList[i]); pBe->CloseTempFile(pBe, p->apList[i]);
p->apList[i] = 0; p->apList[i] = 0;
} }
break; break;

7
www/changes.tcl
View File

@ -17,6 +17,13 @@ proc chng {date desc} {
puts "<DD><P><UL>$desc</UL></P></DD>" puts "<DD><P><UL>$desc</UL></P></DD>"
} }
chng {2000 Oct 18 (1.0.13)} {
<li>Break out the GDBM driver into a separate file in anticipation
to added new drivers.</li>
<li>Allow the name of a database to be prefixed by the driver type.
For now, the only driver type is "gdbm:".<li>
}
chng {2000 Oct 16 (1.0.12)} { chng {2000 Oct 16 (1.0.12)} {
<li>Fixed an off-by-one error that was causing a coredump in <li>Fixed an off-by-one error that was causing a coredump in
the '%q' format directive of the new the '%q' format directive of the new