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/***************************************************************************
sqlite.c
(c) 2000-2017 Benoît Minisini <benoit.minisini@gambas-basic.org>
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, 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 program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
***************************************************************************/
#define __SQLITE_C
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <libgen.h>
#include "main.h"
/* Internal function to check whether a file is a sqlite database file */
static bool is_sqlite2_database(const char *filename)
{
FILE* fp;
bool res;
char magic_text[48];
fp = fopen(filename, "r");
if (!fp)
return FALSE;
res = fread(magic_text, 1, 47, fp) == 47;
fclose(fp);
if (!res)
return FALSE;
magic_text[47] = '\0';
if (strcmp(magic_text, "** This file contains an SQLite 2.1 database **"))
return FALSE;
return TRUE;
}
static bool is_sqlite3_database(const char *filename)
{
FILE *fp;
bool res;
char magic_text[16];
fp = fopen(filename, "r");
if (!fp)
return FALSE;
res = fread(magic_text, 1, 15, fp) == 15;
fclose(fp);
if (!res)
return FALSE;
magic_text[15] = '\0';
if (strcmp(magic_text, "SQLite format 3"))
return FALSE;
return TRUE;
}
static bool is_database_file(const char *filename)
{
return is_sqlite3_database(filename) || is_sqlite2_database(filename);
}
static char *find_database(const char *name, const char *hostName)
{
char *dbhome = NULL;
char *fullpath = NULL;
char *path;
/* Does Name includes fullpath */
if (*name == '/')
{
if (is_database_file(name))
return (char *)name;
}
/* Hostname contains home area */
fullpath = GB.NewZeroString(hostName);
fullpath = GB.AddChar(fullpath, '/');
fullpath = GB.AddString(fullpath, name, 0);
path = GB.FileName(fullpath, GB.StringLength(fullpath));
GB.FreeString(&fullpath);
if (is_database_file(path))
return path;
/* Check the GAMBAS_SQLITE_DBHOME setting */
dbhome = getenv("GAMBAS_SQLITE_DBHOME");
if (dbhome != NULL)
{
fullpath = GB.NewZeroString(dbhome);
fullpath = GB.AddChar(fullpath, '/');
fullpath = GB.AddString(fullpath, name, 0);
path = GB.FileName(fullpath, GB.StringLength(fullpath));
GB.FreeString(&fullpath);
if (is_database_file(path))
return path;
}
fullpath = GB.NewZeroString(GB.TempDir());
fullpath = GB.AddString(fullpath, "/sqlite/", 0);
fullpath = GB.AddString(fullpath, name, 0);
GB.FreeStringLater(fullpath);
if (is_database_file(fullpath))
return fullpath;
return NULL;
}
//-------------------------------------------------------------------------
static int open_database(DB_DESC *desc, DB_DATABASE * db)
{
char *host;
const char *db_fullpath = NULL;
bool ver2 = FALSE;
if (!desc->name) // memory database
goto __SQLITE;
host = desc->host;
if (!host)
host = "";
db_fullpath = find_database(desc->name, host);
if (!db_fullpath)
{
GB.Error("Unable to locate database `&1` in `&2`", desc->name, host);
return TRUE;
}
ver2 = is_sqlite2_database(db_fullpath);
if (ver2)
goto __SQLITE2;
else
goto __SQLITE3;
__SQLITE:
GB.Component.Load("gb.db.sqlite3");
GB.Error(NULL);
if (GB.Component.Exist("gb.db.sqlite3"))
goto __SQLITE3;
else
goto __SQLITE2;
__SQLITE2:
DB_TryAnother("sqlite2");
return TRUE;
__SQLITE3:
DB_TryAnother("sqlite3");
return TRUE;
}
//-------------------------------------------------------------------------
static int database_is_system(DB_DATABASE * db, const char *name)
{
return FALSE;
}
/*****************************************************************************
The driver interface
*****************************************************************************/
DB_DRIVER DB_sqlite_pseudo_driver =
{
.name = "sqlite",
.Open = open_database,
.Database.IsSystem = database_is_system
};
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