sys_file_table1.c

阿基米德操作系统的源代码

/////////////////////////////////////////////////////////////////////
#include "general.h"

#include "hd_info_struct.h"
#include "dir_entry.h"
#include "msdos_dir_entry.h"
#include "d_inode.h"
#include "m_inode.h"
#include "buffer_head.h"
#include "fat_cache.h"
#include "file.h"
#include "hd_request_struct.h"
#include "super_block.h"

#include "common_head.h"

int msdos_sys_open(const char * filename,unsigned long flag,unsigned long mode);
int sys_open(const char * filename,unsigned long flag,unsigned long mode);
int msdos_sys_close(int fd);
int sys_close(int fd);
int msdos_sys_lseek(unsigned int fd, int offset, int origin);
int sys_lseek(unsigned int fd, int offset, int origin);
int msdos_sys_read(unsigned int fd,char * buf,int count);
int sys_read(unsigned int fd,char * buf,int count);
int msdos_sys_write(unsigned int fd,char * buf,int count);
int sys_write(unsigned int fd,char * buf,int count);

int sys_getsize(unsigned int fd);
/////////////////////////////////////////////////////////////////////
	
int sys1_open(const char * filename,unsigned long flag,unsigned long mode)
{
	int temp_ret;

	if (current_driver == 0)
	{
		temp_ret = -1;
		if (floppy_workstate == 1)
			temp_ret = msdos_sys_open(filename, flag, mode);
		if (floppy_workstate != 1)
			invalid_fd(0);
	}
	else if ((current_driver > 1) && (current_driver < nr_super_blocks))
		temp_ret = sys_open(filename, flag, mode);
	else
		temp_ret = -1;

	return temp_ret;
}

int sys1_close(int fd)
{
	long temp_driver;
	int  temp_ret;

	if (fd >= NR_FILE)
		return -1;
	if ((file_table[fd].f_count == 0) || (file_table[fd].f_inode == NULL))
	{
		file_table[fd].f_count = 0;
		file_table[fd].f_inode = NULL;
		return -1;
	}
	temp_driver = file_table[fd].f_inode->i_dev;

	if (temp_driver == 0)
	{
		temp_ret = msdos_sys_close(fd);
		if (floppy_workstate != 1)
			invalid_fd(0);
	}
	else if ((temp_driver > 1) && (temp_driver < nr_super_blocks))
		temp_ret = sys_close(fd);
	else
		temp_ret = -1;

	return temp_ret;
}

int sys1_lseek(unsigned int fd, int offset, int origin)
{
	long temp_driver;
	int  temp_ret;

	if (fd >= NR_FILE)
		return -1;
	if ((file_table[fd].f_count == 0) || (file_table[fd].f_inode == NULL))
	{
		file_table[fd].f_count = 0;
		file_table[fd].f_inode = NULL;
		return -1;
	}
	temp_driver = file_table[fd].f_inode->i_dev;

	if (temp_driver == 0)
	{
		temp_ret = -1;
		if (floppy_workstate == 1)
			temp_ret = msdos_sys_lseek(fd, offset, origin);
		if (floppy_workstate != 1)
			invalid_fd(0);
	}
	else if ((temp_driver > 1) && (temp_driver < nr_super_blocks))
		temp_ret = sys_lseek(fd, offset, origin);
	else
		temp_ret = -1;

	return temp_ret;
}

int sys1_read(unsigned int fd,char * buf,int count)
{
	long temp_driver;
	int  temp_ret;

	if (fd >= NR_FILE)
		return -1;
	if ((file_table[fd].f_count == 0) || (file_table[fd].f_inode == NULL))
	{
		file_table[fd].f_count = 0;
		file_table[fd].f_inode = NULL;
		return -1;
	}
	temp_driver = file_table[fd].f_inode->i_dev;

	if (temp_driver == 0)
	{
		temp_ret = -1;
		if (floppy_workstate == 1)
			temp_ret = msdos_sys_read(fd, buf, count);
		if (floppy_workstate != 1)
			invalid_fd(0);
	}
	else if ((temp_driver > 1) && (temp_driver < nr_super_blocks))
		temp_ret = sys_read(fd, buf, count);
	else
		temp_ret = -1;

	return temp_ret;
}

int sys1_write(unsigned int fd,char * buf,int count)
{
	long temp_driver;
	int  temp_ret;

	if (fd >= NR_FILE)
		return -1;
	if ((file_table[fd].f_count == 0) || (file_table[fd].f_inode == NULL))
	{
		file_table[fd].f_count = 0;
		file_table[fd].f_inode = NULL;
		return -1;
	}
	temp_driver = file_table[fd].f_inode->i_dev;

	if (temp_driver == 0)
	{
		temp_ret = -1;
		if (floppy_workstate == 1)
			temp_ret = msdos_sys_write(fd, buf, count);
		if (floppy_workstate != 1)
			invalid_fd(0);
	}
	else if ((temp_driver > 1) && (temp_driver < nr_super_blocks))
		temp_ret = sys_write(fd, buf, count);
	else
		temp_ret = -1;

	return temp_ret;
}

int sys1_getsize(unsigned int fd)
{
	int temp_ret;
	
	temp_ret = sys_getsize(fd);

	return temp_ret;
}

/////////////////////////////////////////////////////////////////////