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-rw-r--r--contrib/global/lib/dbop.c332
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diff --git a/contrib/global/lib/dbop.c b/contrib/global/lib/dbop.c
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-/*
- * Copyright (c) 1996, 1997, 1998 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.
- *
- * dbop.c 12-Nov-98
- *
- */
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include <assert.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "dbop.h"
-#include "die.h"
-#include "test.h"
-
-static DBT key; /* key of record */
-static DBT dat; /* data of record */
-/*
- * dbop_open: open db database.
- *
- * i) dbname database name
- * i) mode 0: read only, 1: create, 2: modify
- * i) perm file permission
- * i) flags
- * DBOP_DUP: allow duplicate records.
- * DBOP_REMOVE: remove on closed.
- * r) descripter for dbop_xxx()
- */
-DBOP *
-dbop_open(dbname, mode, perm, flags)
-const char *dbname;
-int mode;
-int perm;
-int flags;
-{
- DB *db;
- int rw = 0;
- DBOP *dbop;
- BTREEINFO info;
-
- /*
- * setup argments.
- */
- switch (mode) {
- case 0:
- rw = O_RDONLY;
- break;
- case 1:
- rw = O_RDWR|O_CREAT|O_TRUNC;
- break;
- case 2:
- rw = O_RDWR;
- break;
- default:
- assert(0);
- }
- memset(&info, 0, sizeof(info));
- if (flags & DBOP_DUP)
- info.flags |= R_DUP;
- info.cachesize = 500000;
-
- /*
- * 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)
- return NULL;
- if (!(dbop = (DBOP *)malloc(sizeof(DBOP))))
- die("short of memory.");
- strcpy(dbop->dbname, dbname);
- dbop->db = db;
- dbop->openflags = flags;
- dbop->perm = (mode == 1) ? perm : 0;
- dbop->lastkey = NULL;
- dbop->lastdat = NULL;
-
- return dbop;
-}
-/*
- * dbop_get: get data by a key.
- *
- * i) dbop descripter
- * i) name name
- * r) pointer to data
- */
-char *
-dbop_get(dbop, name)
-DBOP *dbop;
-const char *name;
-{
- DB *db = dbop->db;
- int status;
-
- key.data = (char *)name;
- key.size = strlen(name)+1;
-
- status = (*db->get)(db, &key, &dat, 0);
- dbop->lastkey = (char *)key.data;
- dbop->lastdat = (char *)dat.data;
- switch (status) {
- case RET_SUCCESS:
- break;
- case RET_ERROR:
- die("cannot read from database.");
- case RET_SPECIAL:
- return (NULL);
- }
- return((char *)dat.data);
-}
-/*
- * dbop_put: put data by a key.
- *
- * i) dbop descripter
- * i) name key
- * i) data data
- */
-void
-dbop_put(dbop, name, data)
-DBOP *dbop;
-const char *name;
-const char *data;
-{
- DB *db = dbop->db;
- int status;
-
- if (strlen(name) > MAXKEYLEN)
- die("primary key too long.");
- key.data = (char *)name;
- key.size = strlen(name)+1;
- dat.data = (char *)data;
- dat.size = strlen(data)+1;
-
- status = (*db->put)(db, &key, &dat, 0);
- switch (status) {
- case RET_SUCCESS:
- break;
- case RET_ERROR:
- case RET_SPECIAL:
- die("cannot write to database.");
- }
-}
-/*
- * dbop_del: delete record by a key.
- *
- * i) dbop descripter
- * i) name key
- */
-void
-dbop_del(dbop, name)
-DBOP *dbop;
-const char *name;
-{
- DB *db = dbop->db;
- int status;
-
- if (name) {
- key.data = (char *)name;
- key.size = strlen(name)+1;
- status = (*db->del)(db, &key, 0);
- } else
- status = (*db->del)(db, &key, R_CURSOR);
- if (status == RET_ERROR)
- die("cannot delete record.");
-}
-/*
- * dbop_first: get first record.
- *
- * i) dbop dbop descripter
- * i) name key
- * !=NULL: indexed read by key
- * ==NULL: sequential read
- * i) flags following dbop_next call take over this.
- * DBOP_KEY read key part
- * DBOP_PREFIX prefix read
- * only valied when sequential read
- * r) data
- */
-char *
-dbop_first(dbop, name, flags)
-DBOP *dbop;
-const char *name;
-int flags;
-{
- DB *db = dbop->db;
- int status;
-
- if (flags & DBOP_PREFIX && !name)
- flags &= ~DBOP_PREFIX;
- if (name) {
- if (strlen(name) > MAXKEYLEN)
- die("primary key too long.");
- strcpy(dbop->key, name);
- key.data = (char *)name;
- key.size = strlen(name);
- /*
- * includes NULL character unless prefix read.
- */
- if (!(flags & DBOP_PREFIX))
- key.size++;
- dbop->keylen = key.size;
- status = (*db->seq)(db, &key, &dat, R_CURSOR);
- } else {
- dbop->keylen = dbop->key[0] = 0;
- /* skip META records */
- for (status = (*db->seq)(db, &key, &dat, R_FIRST);
- status == RET_SUCCESS;
- status = (*db->seq)(db, &key, &dat, R_NEXT)) {
- int c = (flags & DBOP_KEY) ? *((char *)key.data) : *((char *)dat.data);
- if (c != ' ')
- break;
- }
- }
- dbop->lastkey = (char *)key.data;
- dbop->lastdat = (char *)dat.data;
- switch (status) {
- case RET_SUCCESS:
- break;
- case RET_ERROR:
- die("dbop_first failed.");
- case RET_SPECIAL:
- return (NULL);
- }
- dbop->ioflags = flags;
- if (flags & DBOP_PREFIX) {
- if (strncmp((char *)key.data, dbop->key, dbop->keylen))
- return NULL;
- } else if (dbop->keylen) {
- if (strcmp((char *)key.data, dbop->key))
- return NULL;
- }
- if (flags & DBOP_KEY) {
- strcpy(dbop->prev, (char *)key.data);
- return (char *)key.data;
- }
- return ((char *)dat.data);
-}
-/*
- * dbop_next: get next record.
- *
- * i) dbop dbop descripter
- * r) data
- *
- * Db_next always skip meta records.
- */
-char *
-dbop_next(dbop)
-DBOP *dbop;
-{
- DB *db = dbop->db;
- int flags = dbop->ioflags;
- int status;
-
- while ((status = (*db->seq)(db, &key, &dat, R_NEXT)) == RET_SUCCESS) {
- assert(dat.data != NULL);
- if (flags & DBOP_KEY && *((char *)key.data) == ' ')
- continue;
- else if (*((char *)dat.data) == ' ')
- continue;
- if (flags & DBOP_KEY) {
- if (!strcmp(dbop->prev, (char *)key.data))
- continue;
- if (strlen((char *)key.data) > MAXKEYLEN)
- die("primary key too long.");
- strcpy(dbop->prev, (char *)key.data);
- }
- dbop->lastkey = (char *)key.data;
- dbop->lastdat = (char *)dat.data;
- if (flags & DBOP_PREFIX) {
- if (strncmp((char *)key.data, dbop->key, dbop->keylen))
- return NULL;
- } else if (dbop->keylen) {
- if (strcmp((char *)key.data, dbop->key))
- return NULL;
- }
- return (flags & DBOP_KEY) ? (char *)key.data : (char *)dat.data;
- }
- if (status == RET_ERROR)
- die("dbop_next failed.");
- return NULL;
-}
-/*
- * dbop_close: close db
- *
- * i) dbop dbop descripter
- */
-void
-dbop_close(dbop)
-DBOP *dbop;
-{
- DB *db = dbop->db;
-
- (void)db->close(db);
- if (dbop->openflags & DBOP_REMOVE)
- (void)unlink(dbop->dbname);
- else if (dbop->perm && chmod(dbop->dbname, dbop->perm) < 0)
- die("cannot change file mode.");
- (void)free(dbop);
-}
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