databasehelpers.cc File Reference

Helper functions for database handling. More...

#include <config.h>
#include "databasehelpers.h"
#include "backends.h"
#include "glass/glass_defs.h"
#include "honey/honey_defs.h"
#include "io_utils.h"
#include "omassert.h"
#include "posixy_wrapper.h"
#include <algorithm>
#include <cstring>
#include <string>
#include <sys/types.h>
#include "safesysstat.h"
#include "safeunistd.h"

Include dependency graph for databasehelpers.cc:

Go to the source code of this file.

Functions
static int	test_if_single_file_db_ (int fd, off_t pos)
int	test_if_single_file_db (int fd)
	Probe if a file descriptor is a single-file database. More...
int	test_if_single_file_db (const struct stat &sb, const string &path, int *fd_ptr)
	Probe if a path is a single-file database. More...

Detailed Description

Helper functions for database handling.

Definition in file databasehelpers.cc.

Function Documentation

test_if_single_file_db() [1/2]

int test_if_single_file_db	(	const struct stat &	sb,
		const std::string &	path,
		int *	fd_ptr
	)

Probe if a path is a single-file database.

Parameters

sb	struct statbuf from calling stat() on path
path	path to probe
fd_ptr	used to return fd open of path (unless BACKEND_UNKNOWN is returned)

Returns

A BACKEND_* constant from backends.h:

• BACKEND_UNKNOWN : unknown (could be a stub file)
• BACKEND_GLASS : glass single file
• BACKEND_HONEY : honey single file

Definition at line 89 of file databasehelpers.cc.

References Assert, BACKEND_UNKNOWN, close(), GLASS_MIN_BLOCKSIZE, HONEY_MIN_DB_SIZE, O_BINARY, posixy_open, S_ISREG, and test_if_single_file_db_().

test_if_single_file_db() [2/2]

int test_if_single_file_db

(

int

fd

)

Probe if a file descriptor is a single-file database.

This function looks for a single-file database at the current file offset of fd, restoring the file offset afterwards.

Parameters

fd	The file descriptor to check

Returns

A BACKEND_* constant from backends.h:

• BACKEND_UNKNOWN : unknown (could be a stub file)
• BACKEND_GLASS : glass single file
• BACKEND_HONEY : honey single file

Definition at line 79 of file databasehelpers.cc.

References BACKEND_UNKNOWN, pos, and test_if_single_file_db_().

Referenced by Xapian::Database::check_(), Xapian::Database::Database(), and Xapian::database_factory().

test_if_single_file_db_()

static int test_if_single_file_db_ ( int  fd, off_t  pos  )

static

Definition at line 45 of file databasehelpers.cc.

References BACKEND_GLASS, BACKEND_HONEY, BACKEND_UNKNOWN, io_read(), and pos.

Referenced by test_if_single_file_db().