haiku/headers/private/storage/storage_support.h

/*
 * Copyright 2002-2006, Haiku Inc.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *		Tyler Dauwalder
 */
#ifndef _STORAGE_SUPPORT_H
#define _STORAGE_SUPPORT_H

/*!
	\file storage_support.h
	Interface declarations for miscellaneous internal
	Storage Kit support functions.
*/

#include <StorageDefs.h>
#include <SupportDefs.h>

#include <dirent.h>
#include <string>


namespace BPrivate {
namespace Storage {

// For convenience:
struct LongDirEntry {
	char _[sizeof(struct dirent) + B_FILE_NAME_LENGTH + 1];
	struct dirent* dirent() { return (struct dirent*)_; }
};

//! Returns whether the supplied path is absolute.
bool is_absolute_path(const char *path);

status_t parse_path(const char *fullPath, int &dirEnd, int &leafStart,
	int &leafEnd);
status_t parse_path(const char *fullPath, char *dirPath, char *leaf);

//!	splits a path name into directory path and leaf name
status_t split_path(const char *fullPath, char *&path, char *&leaf);

//!	splits a path name into directory path and leaf name
status_t split_path(const char *fullPath, char **path, char **leaf);

//! Parses the first component of a path name.
status_t parse_first_path_component(const char *path, int32& length,
									int32& nextComponent);

//! Parses the first component of a path name.
status_t parse_first_path_component(const char *path, char *&component,
									int32& nextComponent);

//! Checks whether an entry name is a valid entry name.
status_t check_entry_name(const char *entry);

//! Checks whether a path name is a valid path name.
status_t check_path_name(const char *path);

/*! \brief Returns a copy of \c str in which all alphabetic characters
	are lowercase.

	Returns \c "(null)" if you're a bonehead and pass in a \c NULL pointer.
*/
std::string to_lower(const char *str);

/*! \brief Places a copy of \c str in \c result in which all alphabetic
	characters are lowercase.

	Returns \c "(null)" if you're a bonehead and pass in a \c NULL pointer.
*/
void to_lower(const char *str, std::string &result);

/*! \brief Copies \c str into \c result, converting any uppercase alphabetics
	to lowercase.

	\a str and \a result may point to the same string. \a result is
	assumed to be as long as or longer than \a str.
*/
void to_lower(const char *str, char *result);

//! Converts \c str to lowercase.
void to_lower(char *str);

/*! \brief Escapes any whitespace or other special characters in the path

	\a result must be large enough to accomodate the addition of
	escape sequences to \a str. \a str and \a result may *NOT* point to
	the same string.

	Note that this function was designed for use with the registrar's
	RecentEntries class, and may not create escapes exactly like you're
	hoping.	Please double check the code for the function to see if this
	is the case.
*/
void escape_path(const char *str, char *result);

/*! \brief Escapes any whitespace or other special characters in the path

	\a str must be large enough to accomodate the addition of
	escape sequences.
*/
void escape_path(char *str);

/*!	\brief Returns whether the supplied device ID refers to the root FS.
*/
bool device_is_root_device(dev_t device);

// FDCloser
class FDCloser {
public:
	FDCloser(int fd)
		: fFD(fd)
	{
	}

	~FDCloser()
	{
		Close();
	}

	void SetTo(int fd)
	{
		Close();
		fFD = fd;
	}

// implemented in the source file to not expose syscalls to the unit tests
// which include this file too
	void Close();
//	void Close()
//	{
//		if (fFD >= 0)
//			_kern_close(fFD);
//		fFD = -1;
//	}

	int Detach()
	{
		int fd = fFD;
		fFD = -1;
		return fd;
	}

private:
	int	fFD;
};

};	// namespace Storage
};	// namespace BPrivate

using BPrivate::Storage::FDCloser;

#endif	// _STORAGE_SUPPORT_H