db185.c
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上传日期:2022-05-23
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- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char copyright[] =
- "Copyright (c) 1996-2002nSleepycat Software Inc. All rights reserved.n";
- static const char revid[] =
- "$Id: db185.c,v 11.28 2002/05/09 01:55:14 bostic Exp $";
- #endif
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <fcntl.h>
- #include <string.h>
- #include <unistd.h>
- #endif
- #include "db_int.h"
- #include "db185_int.h"
- static int db185_close __P((DB185 *));
- static int db185_compare __P((DB *, const DBT *, const DBT *));
- static int db185_del __P((const DB185 *, const DBT185 *, u_int));
- static int db185_fd __P((const DB185 *));
- static int db185_get __P((const DB185 *, const DBT185 *, DBT185 *, u_int));
- static u_int32_t
- db185_hash __P((DB *, const void *, u_int32_t));
- static void db185_openstderr __P((DB_FH *));
- static size_t db185_prefix __P((DB *, const DBT *, const DBT *));
- static int db185_put __P((const DB185 *, DBT185 *, const DBT185 *, u_int));
- static int db185_seq __P((const DB185 *, DBT185 *, DBT185 *, u_int));
- static int db185_sync __P((const DB185 *, u_int));
- /*
- * EXTERN: #ifdef _DB185_INT_H_
- * EXTERN: DB185 *__db185_open
- * EXTERN: __P((const char *, int, int, DBTYPE, const void *));
- * EXTERN: #else
- * EXTERN: DB *__db185_open
- * EXTERN: __P((const char *, int, int, DBTYPE, const void *));
- * EXTERN: #endif
- */
- DB185 *
- __db185_open(file, oflags, mode, type, openinfo)
- const char *file;
- int oflags, mode;
- DBTYPE type;
- const void *openinfo;
- {
- const BTREEINFO *bi;
- const HASHINFO *hi;
- const RECNOINFO *ri;
- DB *dbp;
- DB185 *db185p;
- DB_FH fh;
- size_t nw;
- int ret;
- dbp = NULL;
- db185p = NULL;
- if ((ret = db_create(&dbp, NULL, 0)) != 0)
- goto err;
- if ((ret = __os_calloc(NULL, 1, sizeof(DB185), &db185p)) != 0)
- goto err;
- /*
- * !!!
- * The DBTYPE enum wasn't initialized in DB 185, so it's off-by-one
- * from DB 2.0.
- */
- switch (type) {
- case 0: /* DB_BTREE */
- type = DB_BTREE;
- if ((bi = openinfo) != NULL) {
- if (bi->flags & ~R_DUP)
- goto einval;
- if (bi->flags & R_DUP)
- (void)dbp->set_flags(dbp, DB_DUP);
- if (bi->cachesize != 0)
- (void)dbp->set_cachesize
- (dbp, 0, bi->cachesize, 0);
- if (bi->minkeypage != 0)
- (void)dbp->set_bt_minkey(dbp, bi->minkeypage);
- if (bi->psize != 0)
- (void)dbp->set_pagesize(dbp, bi->psize);
- /*
- * !!!
- * Comparisons and prefix calls work because the DBT
- * structures in 1.85 and 2.0 have the same initial
- * fields.
- */
- if (bi->prefix != NULL) {
- db185p->prefix = bi->prefix;
- dbp->set_bt_prefix(dbp, db185_prefix);
- }
- if (bi->compare != NULL) {
- db185p->compare = bi->compare;
- dbp->set_bt_compare(dbp, db185_compare);
- }
- if (bi->lorder != 0)
- dbp->set_lorder(dbp, bi->lorder);
- }
- break;
- case 1: /* DB_HASH */
- type = DB_HASH;
- if ((hi = openinfo) != NULL) {
- if (hi->bsize != 0)
- (void)dbp->set_pagesize(dbp, hi->bsize);
- if (hi->ffactor != 0)
- (void)dbp->set_h_ffactor(dbp, hi->ffactor);
- if (hi->nelem != 0)
- (void)dbp->set_h_nelem(dbp, hi->nelem);
- if (hi->cachesize != 0)
- (void)dbp->set_cachesize
- (dbp, 0, hi->cachesize, 0);
- if (hi->hash != NULL) {
- db185p->hash = hi->hash;
- (void)dbp->set_h_hash(dbp, db185_hash);
- }
- if (hi->lorder != 0)
- dbp->set_lorder(dbp, hi->lorder);
- }
- break;
- case 2: /* DB_RECNO */
- type = DB_RECNO;
- /* DB 1.85 did renumbering by default. */
- (void)dbp->set_flags(dbp, DB_RENUMBER);
- /*
- * !!!
- * The file name given to DB 1.85 recno is the name of the DB
- * 2.0 backing file. If the file doesn't exist, create it if
- * the user has the O_CREAT flag set, DB 1.85 did it for you,
- * and DB 2.0 doesn't.
- *
- * !!!
- * Setting the file name to NULL specifies that we're creating
- * a temporary backing file, in DB 2.X. If we're opening the
- * DB file read-only, change the flags to read-write, because
- * temporary backing files cannot be opened read-only, and DB
- * 2.X will return an error. We are cheating here -- if the
- * application does a put on the database, it will succeed --
- * although that would be a stupid thing for the application
- * to do.
- *
- * !!!
- * Note, the file name in DB 1.85 was a const -- we don't do
- * that in DB 2.0, so do that cast.
- */
- if (file != NULL) {
- if (oflags & O_CREAT && __os_exists(file, NULL) != 0)
- if (__os_openhandle(NULL, file,
- oflags, mode, &fh) == 0)
- (void)__os_closehandle(NULL, &fh);
- (void)dbp->set_re_source(dbp, file);
- if (O_RDONLY)
- oflags &= ~O_RDONLY;
- oflags |= O_RDWR;
- file = NULL;
- }
- if ((ri = openinfo) != NULL) {
- /*
- * !!!
- * We can't support the bfname field.
- */
- #define BFMSG "DB: DB 1.85's recno bfname field is not supported.n"
- if (ri->bfname != NULL) {
- db185_openstderr(&fh);
- (void)__os_write(NULL, &fh,
- BFMSG, sizeof(BFMSG) - 1, &nw);
- goto einval;
- }
- if (ri->flags & ~(R_FIXEDLEN | R_NOKEY | R_SNAPSHOT))
- goto einval;
- if (ri->flags & R_FIXEDLEN) {
- if (ri->bval != 0)
- (void)dbp->set_re_pad(dbp, ri->bval);
- if (ri->reclen != 0)
- (void)dbp->set_re_len(dbp, ri->reclen);
- } else
- if (ri->bval != 0)
- (void)dbp->set_re_delim(dbp, ri->bval);
- /*
- * !!!
- * We ignore the R_NOKEY flag, but that's okay, it was
- * only an optimization that was never implemented.
- */
- if (ri->flags & R_SNAPSHOT)
- (void)dbp->set_flags(dbp, DB_SNAPSHOT);
- if (ri->cachesize != 0)
- (void)dbp->set_cachesize
- (dbp, 0, ri->cachesize, 0);
- if (ri->psize != 0)
- (void)dbp->set_pagesize(dbp, ri->psize);
- if (ri->lorder != 0)
- dbp->set_lorder(dbp, ri->lorder);
- }
- break;
- default:
- goto einval;
- }
- db185p->close = db185_close;
- db185p->del = db185_del;
- db185p->fd = db185_fd;
- db185p->get = db185_get;
- db185p->put = db185_put;
- db185p->seq = db185_seq;
- db185p->sync = db185_sync;
- /*
- * Store a reference so we can indirect from the DB 1.85 structure
- * to the underlying DB structure, and vice-versa. This has to be
- * done BEFORE the DB::open method call because the hash callback
- * is exercised as part of hash database initialiation.
- */
- db185p->dbp = dbp;
- dbp->api_internal = db185p;
- /* Open the database. */
- if ((ret = dbp->open(dbp, NULL,
- file, NULL, type, __db_oflags(oflags), mode)) != 0)
- goto err;
- /* Create the cursor used for sequential ops. */
- if ((ret = dbp->cursor(dbp, NULL, &((DB185 *)db185p)->dbc, 0)) != 0)
- goto err;
- return (db185p);
- err: if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- einval: ret = EINVAL;
- if (db185p != NULL)
- __os_free(NULL, db185p);
- if (dbp != NULL)
- (void)dbp->close(dbp, 0);
- __os_set_errno(ret);
- return (NULL);
- }
- static int
- db185_close(db185p)
- DB185 *db185p;
- {
- DB *dbp;
- int ret;
- dbp = db185p->dbp;
- ret = dbp->close(dbp, 0);
- __os_free(NULL, db185p);
- if (ret == 0)
- return (0);
- if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- ret = EINVAL;
- __os_set_errno(ret);
- return (-1);
- }
- static int
- db185_del(db185p, key185, flags)
- const DB185 *db185p;
- const DBT185 *key185;
- u_int flags;
- {
- DB *dbp;
- DBT key;
- int ret;
- dbp = db185p->dbp;
- memset(&key, 0, sizeof(key));
- key.data = key185->data;
- key.size = key185->size;
- if (flags & ~R_CURSOR)
- goto einval;
- if (flags & R_CURSOR)
- ret = db185p->dbc->c_del(db185p->dbc, 0);
- else
- ret = dbp->del(dbp, NULL, &key, 0);
- switch (ret) {
- case 0:
- return (0);
- case DB_NOTFOUND:
- return (1);
- }
- if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- einval: ret = EINVAL;
- __os_set_errno(ret);
- return (-1);
- }
- static int
- db185_fd(db185p)
- const DB185 *db185p;
- {
- DB *dbp;
- int fd, ret;
- dbp = db185p->dbp;
- if ((ret = dbp->fd(dbp, &fd)) == 0)
- return (fd);
- if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- ret = EINVAL;
- __os_set_errno(ret);
- return (-1);
- }
- static int
- db185_get(db185p, key185, data185, flags)
- const DB185 *db185p;
- const DBT185 *key185;
- DBT185 *data185;
- u_int flags;
- {
- DB *dbp;
- DBT key, data;
- int ret;
- dbp = db185p->dbp;
- memset(&key, 0, sizeof(key));
- key.data = key185->data;
- key.size = key185->size;
- memset(&data, 0, sizeof(data));
- data.data = data185->data;
- data.size = data185->size;
- if (flags)
- goto einval;
- switch (ret = dbp->get(dbp, NULL, &key, &data, 0)) {
- case 0:
- data185->data = data.data;
- data185->size = data.size;
- return (0);
- case DB_NOTFOUND:
- return (1);
- }
- if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- einval: ret = EINVAL;
- __os_set_errno(ret);
- return (-1);
- }
- static int
- db185_put(db185p, key185, data185, flags)
- const DB185 *db185p;
- DBT185 *key185;
- const DBT185 *data185;
- u_int flags;
- {
- DB *dbp;
- DBC *dbcp_put;
- DBT key, data;
- int ret, t_ret;
- dbp = db185p->dbp;
- memset(&key, 0, sizeof(key));
- key.data = key185->data;
- key.size = key185->size;
- memset(&data, 0, sizeof(data));
- data.data = data185->data;
- data.size = data185->size;
- switch (flags) {
- case 0:
- ret = dbp->put(dbp, NULL, &key, &data, 0);
- break;
- case R_CURSOR:
- ret = db185p->dbc->c_put(db185p->dbc, &key, &data, DB_CURRENT);
- break;
- case R_IAFTER:
- case R_IBEFORE:
- if (dbp->type != DB_RECNO)
- goto einval;
- if ((ret = dbp->cursor(dbp, NULL, &dbcp_put, 0)) != 0)
- break;
- if ((ret =
- dbcp_put->c_get(dbcp_put, &key, &data, DB_SET)) == 0) {
- memset(&data, 0, sizeof(data));
- data.data = data185->data;
- data.size = data185->size;
- ret = dbcp_put->c_put(dbcp_put, &key, &data,
- flags == R_IAFTER ? DB_AFTER : DB_BEFORE);
- }
- if ((t_ret = dbcp_put->c_close(dbcp_put)) != 0 && ret == 0)
- ret = t_ret;
- break;
- case R_NOOVERWRITE:
- ret = dbp->put(dbp, NULL, &key, &data, DB_NOOVERWRITE);
- break;
- case R_SETCURSOR:
- if (dbp->type != DB_BTREE && dbp->type != DB_RECNO)
- goto einval;
- if ((ret = dbp->put(dbp, NULL, &key, &data, 0)) != 0)
- break;
- ret =
- db185p->dbc->c_get(db185p->dbc, &key, &data, DB_SET_RANGE);
- break;
- default:
- goto einval;
- }
- switch (ret) {
- case 0:
- key185->data = key.data;
- key185->size = key.size;
- return (0);
- case DB_KEYEXIST:
- return (1);
- }
- if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- einval: ret = EINVAL;
- __os_set_errno(ret);
- return (-1);
- }
- static int
- db185_seq(db185p, key185, data185, flags)
- const DB185 *db185p;
- DBT185 *key185, *data185;
- u_int flags;
- {
- DB *dbp;
- DBT key, data;
- int ret;
- dbp = db185p->dbp;
- memset(&key, 0, sizeof(key));
- key.data = key185->data;
- key.size = key185->size;
- memset(&data, 0, sizeof(data));
- data.data = data185->data;
- data.size = data185->size;
- switch (flags) {
- case R_CURSOR:
- flags = DB_SET_RANGE;
- break;
- case R_FIRST:
- flags = DB_FIRST;
- break;
- case R_LAST:
- if (dbp->type != DB_BTREE && dbp->type != DB_RECNO)
- goto einval;
- flags = DB_LAST;
- break;
- case R_NEXT:
- flags = DB_NEXT;
- break;
- case R_PREV:
- if (dbp->type != DB_BTREE && dbp->type != DB_RECNO)
- goto einval;
- flags = DB_PREV;
- break;
- default:
- goto einval;
- }
- switch (ret = db185p->dbc->c_get(db185p->dbc, &key, &data, flags)) {
- case 0:
- key185->data = key.data;
- key185->size = key.size;
- data185->data = data.data;
- data185->size = data.size;
- return (0);
- case DB_NOTFOUND:
- return (1);
- }
- if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- einval: ret = EINVAL;
- __os_set_errno(ret);
- return (-1);
- }
- static int
- db185_sync(db185p, flags)
- const DB185 *db185p;
- u_int flags;
- {
- DB *dbp;
- DB_FH fh;
- size_t nw;
- int ret;
- dbp = db185p->dbp;
- switch (flags) {
- case 0:
- break;
- case R_RECNOSYNC:
- /*
- * !!!
- * We can't support the R_RECNOSYNC flag.
- */
- #define RSMSG "DB: DB 1.85's R_RECNOSYNC sync flag is not supported.n"
- db185_openstderr(&fh);
- (void)__os_write(NULL, &fh, RSMSG, sizeof(RSMSG) - 1, &nw);
- goto einval;
- default:
- goto einval;
- }
- if ((ret = dbp->sync(dbp, 0)) == 0)
- return (0);
- if (ret < 0) /* DB 1.85 can't handle DB 2.0's errors. */
- einval: ret = EINVAL;
- __os_set_errno(ret);
- return (-1);
- }
- static void
- db185_openstderr(fhp)
- DB_FH *fhp;
- {
- /* Dummy up the results of an __os_openhandle() on stderr. */
- memset(fhp, 0, sizeof(*fhp));
- F_SET(fhp, DB_FH_VALID);
- #ifndef STDERR_FILENO
- #define STDERR_FILENO 2
- #endif
- fhp->fd = STDERR_FILENO;
- }
- /*
- * db185_compare --
- * Cutout routine to call the user's Btree comparison function.
- */
- static int
- db185_compare(dbp, a, b)
- DB *dbp;
- const DBT *a, *b;
- {
- return (((DB185 *)dbp->api_internal)->compare(a, b));
- }
- /*
- * db185_prefix --
- * Cutout routine to call the user's Btree prefix function.
- */
- static size_t
- db185_prefix(dbp, a, b)
- DB *dbp;
- const DBT *a, *b;
- {
- return (((DB185 *)dbp->api_internal)->prefix(a, b));
- }
- /*
- * db185_hash --
- * Cutout routine to call the user's hash function.
- */
- static u_int32_t
- db185_hash(dbp, key, len)
- DB *dbp;
- const void *key;
- u_int32_t len;
- {
- return (((DB185 *)dbp->api_internal)->hash(key, (size_t)len));
- }