oriansj--M2libc/uefi/fcntl.c

/* Copyright (C) 2016 Jeremiah Orians
 * This file is part of M2-Planet.
 *
 * M2-Planet 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 3 of the License, or
 * (at your option) any later version.
 *
 * M2-Planet 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 M2-Planet.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __FCNTL_C
#define __FCNTL_C

#define O_RDONLY 0
#define O_WRONLY 1
#define O_RDWR 2
#define O_CREAT 00100
#define O_EXCL 00200
#define O_TRUNC 001000
#define O_APPEND 002000

#define S_IXUSR 00100
#define S_IWUSR 00200
#define S_IRUSR 00400
#define S_IRWXU 00700

#include <uefi/uefi.c>

void free(void* l);

int __open(struct efi_file_protocol* _rootdir, char* name, long mode, long attributes)
{
	struct efi_file_protocol* new_handle;
	char* wide_name = _posix_path_to_uefi(name);
	unsigned rval = __uefi_5(_rootdir, &new_handle, wide_name, mode, attributes, _rootdir->open);
	free(wide_name);
	if(rval != EFI_SUCCESS)
	{
		return -1;
	}
	return new_handle;
}

void _set_file_size(struct efi_file_protocol* f, unsigned new_size)
{
	/* Preallocate some extra space for file_name */
	size_t file_info_size = sizeof(struct efi_file_info);
	struct efi_file_info* file_info = calloc(1, file_info_size);
	unsigned r = __uefi_4(f, &EFI_FILE_INFO_GUID, &file_info_size, file_info, f->get_info);
	if(r != EFI_SUCCESS)
	{
		free(file_info);
		return;
	}
	file_info->file_size = new_size;
	__uefi_4(f, &EFI_FILE_INFO_GUID, file_info_size, file_info, f->set_info);
	free(file_info);
}

int _open(char* name, int flag, int mode)
{
	long mode = 0;
	long attributes = 0;
	if ((flag == (O_WRONLY | O_CREAT | O_TRUNC)) || (flag == (O_RDWR | O_CREAT | O_EXCL)))
	{
		mode = EFI_FILE_MODE_CREATE | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ;
	}
	else
	{       /* Everything else is a read */
		mode = EFI_FILE_MODE_READ;
		attributes = EFI_FILE_READ_ONLY;
	}
	int handle = __open(_rootdir, name, mode, attributes);
	if (flag & O_TRUNC)
	{
		_set_file_size(handle, 0);
	}
	return handle;
}

#define STDIN_FILENO  0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
#endif