#include <stdio.h>
#include <string.h>
#include <sys/dirent.h>
#include "fs.h"
#include "core.h"

/* 
 * open dir, return the file structure pointer in _eax_, or NULL if failed 
 */
void opendir(com32sys_t *regs)
{
    char *src = MK_PTR(regs->es, regs->esi.w[0]);
    char *dst = MK_PTR(regs->ds, regs->edi.w[0]);
    strcpy(dst, src);
    pm_searchdir(regs);
    regs->eax.l = (uint32_t)handle_to_file(regs->esi.w[0]);	
}

/*
 * Read one dirent at one time. 
 *
 * @input: _esi_ register stores the address of DIR structure
 * @output: _eax_ register stores the address of newly read dirent structure
 */
void readdir(com32sys_t *regs)
{
    DIR *dir = (DIR *)regs->esi.l;	
    struct dirent *de = NULL;
    
    if (dir->dd_dir)
	de = this_fs->fs_ops->readdir(dir->dd_dir);
    else
	de = NULL;
    
    /* Return the newly read de in _eax_ register */
    regs->eax.l = (uint32_t)de;
}

void closedir(com32sys_t *regs)
{
    DIR *dir = (DIR *)regs->esi.l;
    _close_file(dir->dd_dir);
}