Test FileIO

/*
    Purpose: Xenus NTOS emulator entrypoint.
    Author: Reece W.
    License: All Rights Reserved J. Reece Wilson
*/

#include <xenus_lazy.h>
#include <liblinux.hpp>

#include <ITypes\ITaskStruct.hpp>
#include <ITypes\IFile.hpp>
#include <ITypes\IPath.hpp>

bool file_to_root(char * path, char * dest)
{
	size_t i;
	size_t length;

	length = strlen(path);
	memcpy(dest, path, length + 1);

	for (i = length; i > 0; i--)
	{
		if (path[i] == '/')
		{
			*(char **)(&(dest[i + 1])) = (char *)0x00;
			break;
		}
	}

	return i != 0;
}

int unlink_file(const char * req_path)
{
	char file_dir[256];
	file_k path_handle;
	file_k target_handle;
	inode_k delegated_inode;

	if (!file_to_root((char *)req_path, file_dir))
		return  0;  /* failed to strip path to dir */

	if (!(target_handle = filp_open(req_path, O_RDONLY, 0600)))
		return -1;  /* file not found */

	if (!(path_handle = filp_open(file_dir, O_DIRECTORY, 0600)))
		return -2;  /* dir not found. odd linking? device? who knows? */

	//printf("%s is located in %s\n", req_path, file_dir);

	IFile file		= IFile(target_handle);
	IPath file_path	= IPath(file.get_f_path());
	IFile path		= IFile(path_handle);

	vfs_unlink(path.get_f_inode(),
				file_path.get_dentry(),
				&delegated_inode);

	filp_close(target_handle, 0);
	filp_close(path_handle, 0);

	return 1;
}

void test_write(const char * fn)
{
	loff_t pos;
	file_k file;
	const char * string;

	pos		= 0;
	string	= "Hello from Xenus!";

	if (!(file = filp_open(fn, O_CREAT | O_RDWR, 0777)))
	{
		printf("Failed to open file %s \n", fn);
		return;
	}

	kernel_write(file,
				 (const void *)string,
				 strlen(string),
				 &pos);

	filp_close(file, 0);
}


static mod_global_data_t ntos_module = { 0 };

bool  subsystem_ntos_init(mod_dependency_list_p deps)
{
	return true;
}

int  subsystem_ntos_start()
{
	test_write("/Xenus/TestFile");  //create
	unlink_file("/Xenus/TestFile"); //then delete
	return 1;
}

void  subsystem_ntos_shutdown()
{

}

void entrypoint(xenus_entrypoint_ctx_p context)
{
	/* Do note, the IAT is still NULL'd at this moment in time! */
	context->size = sizeof(xenus_entrypoint_ctx_t);
    context->description = "An emulation attempt of the Microsoft Windows� Kernel (ntos.exe).";
    context->copyright = "All rights reserved, Reece Wilson (2018)";
    context->init = subsystem_ntos_init;
    context->start = subsystem_ntos_start;
    context->shutdown = subsystem_ntos_shutdown;
	context->dependencies.count = 0;
	context->static_data = &ntos_module;
}