typedef struct File File;

typedef struct File File;
typedef struct Node Node;
typedef struct OS OS;

#pragma incomplete File

enum
{
Maxpath= 512,
};

/* a tree for file path's - this mirrors the directory structure */
struct Node
{
String *remname;
Dir *d;
Node *parent;
Node *sibs;
Node *children;
File *fp;
short depth;
char chdirunknown; /* true if QTDIR bit of files in this dir is unknown */
int opens;
};

/* OS types */
enum
{
Unix= 1,
Tops= 2,
Plan9= 3,
VM= 4,
VMS= 5,
MVS= 6,
NetWare= 7,
OS½= 8,
TSO= 9,
NT= 10,
Unknown= 11,
};

struct OS
{
int os;
char *name;
};
extern OS oslist[];

/* temporary files */
void filefree(Node*);
int fileread(Node*, char*, long, int);
int filewrite(Node*, char*, long, int);
void filedirty(Node*);
void fileclean(Node*);
int fileisdirty(Node*);

/* ftp protocol */
void hello(char*);
void quit(void);
void preamble(char*);
void rlogin(char *, char *);
void clogin(char *, char *);
void nop(void);
int readdir(Node*);
int createdir(Node*);
int readfile(Node*);
int createfile(Node*);
int changedir(Node*);
int removefile(Node*);
int removedir(Node*);

/* misc */
void* safecpy(void*, void*, int);
void fatal(char*, ...);
int seterr(char*, ...);
Node* extendpath(Node*, String*);
Node* newnode(Node*, String*);
void uncache(Node*);
void invalidate(Node*);
void uncachedir(Node*, Node*);
Node* newtopsdir(char*);
void fixsymbolic(Node*);
Dir* reallocdir(Dir *d, int dofree);
Dir* dir_change_name(Dir *d, char *name);
Dir* dir_change_uid(Dir *d, char *name);
Dir* dir_change_gid(Dir *d, char *name);
Dir* dir_change_muid(Dir *d, char *name);

extern Node *remdir; /* current directory on remote side */
extern Node *remroot; /* root on remote side */
extern int os; /* remote os */
extern int debug; /* non-zero triggers debugging output */
extern int usenlst;
extern char *nosuchfile;
extern char *ext; /* add to names of non-dir files */
extern int defos;
extern int quiet;
extern char *user;

#define ISCACHED(x) ((x)->d->type)
#define UNCACHED(x) (x)->d->type = 0
#define CACHED(x) { (x)->d->type = 1; (x)->d->atime = time(0); }
#define ISOLD(x) (x)->d->atime + TIMEOUT < time(0)
#define ISVALID(x) ((x)->d->dev)
#define INVALID(x) (x)->d->dev = 0
#define VALID(x) (x)->d->dev = 1
#define TIMEOUT 5*60
#define DMSYML 0x10000000

#define MAXFDATA 8192

extern char net[]; /* network for connections */