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-rw-r--r--contrib/global/lib/dbio.c328
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diff --git a/contrib/global/lib/dbio.c b/contrib/global/lib/dbio.c
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-/*
- * Copyright (c) 1996, 1997 Shigio Yamaguchi. All rights reserved.
- *
- * Redilogibution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redilogibutions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redilogibutions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the dilogibution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by Shigio Yamaguchi.
- * 4. Neither the name of the author nor the names of any co-contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * dbio.c 14-Dec-97
- *
- */
-#include <sys/stat.h>
-
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "dbio.h"
-#include "die.h"
-#include "test.h"
-
-DBT key; /* key of record */
-DBT dat; /* data of record */
-/*
- * db_open: open db database.
- *
- * i) dbname database name
- * i) mode 0: read only, 1: write only, 2: read & write
- * i) perm file permission
- * i) flags
- * DBIO_DUP: allow duplicate records.
- * DBIO_REMOVE: remove on closed.
- * r) descripter for db_xxx()
- *
- * db_open leaves database permission 0600. please chmod(2) to make public.
- */
-DBIO *
-db_open(dbname, mode, perm, flags)
-char *dbname;
-int mode;
-int perm;
-int flags;
-{
- DB *db;
- int rw;
- BTREEINFO info;
- DBIO *dbio;
-
- /*
- * setup argments.
- */
- if (mode == 0)
- rw = O_RDONLY;
- else if (mode == 1)
- rw = O_RDWR|O_CREAT|O_TRUNC;
- else if (mode == 2)
- rw = O_RDWR;
- else
- die("db_open illegal mode.");
- info.flags = (flags & DBIO_DUP) ? R_DUP : 0;
- info.cachesize = 500000;
- info.maxkeypage = 0;
- info.minkeypage = 0;
- info.psize = 0;
- info.compare = NULL;
- info.prefix = NULL;
- info.lorder = LITTLE_ENDIAN;
-
- /*
- * if unlink do job normally, those who already open tag file can use
- * it until closing.
- */
- if (mode == 1 && test("f", dbname))
- (void)unlink(dbname);
- db = dbopen(dbname, rw, 0600, DB_BTREE, &info);
- if (!db)
- die1("db_open failed (dbname = %s).", dbname);
- if (!(dbio = (DBIO *)malloc(sizeof(DBIO))))
- die("short of memory.");
- strcpy(dbio->dbname, dbname);
- dbio->db = db;
- dbio->openflags = flags;
- dbio->perm = (mode == 1) ? perm : 0;
- dbio->lastkey = (char *)0;
- dbio->lastdat = (char *)0;
-
- return dbio;
-}
-/*
- * db_get: get data by a key.
- *
- * i) dbio descripter
- * i) k key
- * r) pointer to data
- */
-char *
-db_get(dbio, k)
-DBIO *dbio;
-char *k;
-{
- DB *db = dbio->db;
- int status;
-
- key.data = k;
- key.size = strlen(k)+1;
-
- status = (*db->get)(db, &key, &dat, 0);
- dbio->lastkey = (char *)key.data;
- dbio->lastdat = (char *)dat.data;
- switch (status) {
- case RET_SUCCESS:
- break;
- case RET_ERROR:
- die("db_get failed.");
- case RET_SPECIAL:
- return((char *)0);
- }
- return((char *)dat.data);
-}
-/*
- * db_put: put data by a key.
- *
- * i) dbio descripter
- * i) k key
- * i) d data
- */
-void
-db_put(dbio, k, d)
-DBIO *dbio;
-char *k;
-char *d;
-{
- DB *db = dbio->db;
- int status;
-
- if (strlen(k) > MAXKEYLEN)
- die("primary key too long.");
- key.data = k;
- key.size = strlen(k)+1;
- dat.data = d;
- dat.size = strlen(d)+1;
-
- status = (*db->put)(db, &key, &dat, 0);
- switch (status) {
- case RET_SUCCESS:
- break;
- case RET_ERROR:
- case RET_SPECIAL:
- die("db_put failed.");
- }
-}
-/*
- * db_del: delete record by a key.
- *
- * i) dbio descripter
- * i) k key
- */
-void
-db_del(dbio, k)
-DBIO *dbio;
-char *k;
-{
- DB *db = dbio->db;
- int status;
-
- if (k) {
- key.data = k;
- key.size = strlen(k)+1;
- status = (*db->del)(db, &key, 0);
- } else
- status = (*db->del)(db, &key, R_CURSOR);
- if (status == RET_ERROR)
- die("db_del failed.");
-}
-/*
- * db_first: get first record.
- *
- * i) dbio dbio descripter
- * i) k key
- * !=NULL: indexed read by key
- * ==NULL: sequential read
- * i) flags following db_next call take over this.
- * DBIO_KEY read key part
- * DBIO_PREFIX prefix read
- * DBIO_SKIPMETA skip META record
- * only valied when sequential read
- * r) data
- */
-char *
-db_first(dbio, k, flags)
-DBIO *dbio;
-char *k;
-int flags;
-{
- DB *db = dbio->db;
- int status;
-
- if (flags & DBIO_PREFIX && !k)
- flags &= ~DBIO_PREFIX;
- if (flags & DBIO_SKIPMETA && k)
- flags &= ~DBIO_SKIPMETA;
- if (k) {
- if (strlen(k) > MAXKEYLEN)
- die("primary key too long.");
- strcpy(dbio->key, k);
- key.data = k;
- key.size = strlen(k);
- /*
- * includes NULL character unless prefix read.
- */
- if (!(flags & DBIO_PREFIX))
- key.size++;
- dbio->keylen = key.size;
- status = (*db->seq)(db, &key, &dat, R_CURSOR);
- } else {
- dbio->keylen = dbio->key[0] = 0;
- for (status = (*db->seq)(db, &key, &dat, R_FIRST);
- status == RET_SUCCESS &&
- flags & DBIO_SKIPMETA &&
- *((char *)dat.data) == ' ';
- status = (*db->seq)(db, &key, &dat, R_NEXT))
- ;
- }
- dbio->lastkey = (char *)key.data;
- dbio->lastdat = (char *)dat.data;
- switch (status) {
- case RET_SUCCESS:
- break;
- case RET_ERROR:
- die("db_first failed.");
- case RET_SPECIAL:
- return ((char *)0);
- }
- dbio->ioflags = flags;
- if (flags & DBIO_PREFIX) {
- if (strncmp((char *)key.data, dbio->key, dbio->keylen))
- return (char *)0;
- } else if (dbio->keylen) {
- if (strcmp((char *)key.data, dbio->key))
- return (char *)0;
- }
- if (flags & DBIO_KEY) {
- strcpy(dbio->prev, (char *)key.data);
- return (char *)key.data;
- }
- return ((char *)dat.data);
-}
-/*
- * db_next: get next record.
- *
- * i) dbio dbio descripter
- * r) data
- */
-char *
-db_next(dbio)
-DBIO *dbio;
-{
- DB *db = dbio->db;
- int flags = dbio->ioflags;
- int status;
-
- while ((status = (*db->seq)(db, &key, &dat, R_NEXT)) == RET_SUCCESS) {
- if (flags & DBIO_SKIPMETA) {
- if (*((char *)dat.data) == ' ')
- continue;
- }
- if (flags & DBIO_KEY) {
- if (!strcmp(dbio->prev, (char *)key.data))
- continue;
- if (strlen((char *)key.data) > MAXKEYLEN)
- die("primary key too long.");
- strcpy(dbio->prev, (char *)key.data);
- }
- dbio->lastkey = (char *)key.data;
- dbio->lastdat = (char *)dat.data;
- if (flags & DBIO_PREFIX) {
- if (strncmp((char *)key.data, dbio->key, dbio->keylen))
- return (char *)0;
- } else if (dbio->keylen) {
- if (strcmp((char *)key.data, dbio->key))
- return (char *)0;
- }
- return (flags & DBIO_KEY) ? (char *)key.data : (char *)dat.data;
- }
- if (status == RET_ERROR)
- die("db_next failed.");
- return (char *)0;
-}
-/*
- * db_close: close db
- *
- * i) dbio dbio descripter
- */
-void
-db_close(dbio)
-DBIO *dbio;
-{
- DB *db = dbio->db;
- (void)db->close(db);
- if (dbio->openflags & DBIO_REMOVE)
- (void)unlink(dbio->dbname);
- else if (dbio->perm && chmod(dbio->dbname, dbio->perm) < 0)
- die("cannot change file mode.");
- (void)free(dbio);
-}
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