/*

 * Copyright (C) 2011-2012  J. Ali Harlow <ali@juiblex.co.uk>

 *

 * 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 of the License, 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.

 */

#include "config.h"

#include <stdlib.h>

#include <stdio.h>

#include <limits.h>

#include <errno.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <string.h>

#include <assert.h>

#include "razor.h"

#include "razor-internal.h"

/*

 * Atomic transactions

 */

static int allow_all_root_names = 0;

/*

 * Primarily intended for testing named roots under UNIX platforms.

 */

RAZOR_EXPORT void

razor_disable_root_name_checks(int disable)

{

	allow_all_root_names = disable;

}

int

razor_allow_all_root_names(void)

{

	return allow_all_root_names;

}

RAZOR_EXPORT const char *

razor_atomic_get_error_msg(struct razor_atomic *atomic)

{

	if (!atomic->error_msg) {

		if (atomic->error_path)

			atomic->error_msg = razor_concat(atomic->error_path,

							 ": ",

							 atomic->error_str,

							 NULL);

		else

			atomic->error_msg = strdup(atomic->error_str);

	}

	return atomic->error_msg;

}

RAZOR_EXPORT void

razor_atomic_abort(struct razor_atomic *atomic, const char *error_msg)

{

	if (!atomic->error_str)

		razor_atomic_set_error_str(atomic, NULL, error_msg);

}

RAZOR_EXPORT int

razor_atomic_in_error_state(struct razor_atomic *atomic)

{

	return atomic->error_str && !atomic->in_undo;

}

#if !HAVE_WINDOWS_KTM

/*

 * Common code with atomic-none and atomic-emulate

 */

#define RAZOR_ASCII_ISALPHA(c)	\

			((c) >= 'A' && (c) <= 'Z' || (c) >= 'a' && (c) <= 'z')

int

razor_valid_root_name(const char *name)

{

	if (razor_allow_all_root_names()) {

#ifdef MSWIN_API

		return !strpbrk(name, "/\\");

#else

		return !strchr(name, '/');

#endif

	}

#ifdef MSWIN_API

	return RAZOR_ASCII_ISALPHA(name[0]) && name[1] == ':' &&

	       name[2] == '\0';

#else

	return name[0] == '\0';

#endif

}

#ifdef MSWIN_API

void

razor_atomic_set_error_mswin(struct razor_atomic *atomic, const wchar_t *path,

			     DWORD error)

{

	wchar_t *buf;

	assert(!atomic->error_str);

	free(atomic->error_path);

	if (path)

		atomic->error_path = razor_utf16_to_utf8(path, -1);

	else

		atomic->error_path = NULL;

	FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER|

		       FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,

		       NULL, error, MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),

		       (LPWSTR)&buf, 0, NULL);

	atomic->error_str = razor_utf16_to_utf8(buf, -1);

	LocalFree(buf);

}

#endif

void

razor_atomic_set_error_str(struct razor_atomic *atomic, const char *path,

			   const char *str)

{

	assert(!atomic->error_str);

	atomic->error_path = path ? strdup(path) : NULL;

	atomic->error_str = strdup(str);

}

RAZOR_EXPORT int

razor_atomic_write(struct razor_atomic *atomic, int fd, const void *data,

		   size_t size)

{

	int written;

	if (razor_atomic_in_error_state(atomic))

		return -1;

	while(size) {

		written = write(fd, data, size);

		if (written < 0) {

			razor_atomic_set_error_str(atomic, NULL,

						   strerror(errno));

			(void)close(fd);

			return -1;

		}

		data += written;

		size -= written;

	}

	return 0;

}

RAZOR_EXPORT int

razor_atomic_sync(struct razor_atomic *atomic, int handle)

{

	if (razor_atomic_in_error_state(atomic))

		return -1;

	if (fsync(handle) < 0) {

		razor_atomic_set_error_str(atomic, NULL, strerror(errno));

		return -1;

	}

	free(atomic->error_path);

	atomic->error_path = NULL;

	return 0;

}

RAZOR_EXPORT int

razor_atomic_close(struct razor_atomic *atomic, int fd)

{

	if (razor_atomic_in_error_state(atomic))

		return -1;

	if (close(fd) < 0) {

		razor_atomic_set_error_str(atomic, NULL, strerror(errno));

		return -1;

	}

	free(atomic->error_path);

	atomic->error_path = NULL;

	return 0;

}

#endif	/* !HAVE_WINDOWS_KTM */