mc/lib/vfs/mc-vfs/vfs.h

/**
 * \file
 * \brief Header: Virtual File System switch code
 */

#ifndef MC__VFS_VFS_H
#define MC__VFS_VFS_H

#include <sys/types.h>
#include <dirent.h>
#include <utime.h>
#include <stdio.h>

#include "lib/global.h"

/*** typedefs(not structures) and defined constants **********************************************/

#if defined (ENABLE_VFS_FTP) || defined (ENABLE_VFS_FISH) || defined (ENABLE_VFS_SMB)
#define ENABLE_VFS_NET 1
#endif

/**
 * This is the type of callback function passed to vfs_fill_names.
 * It gets the name of the virtual file system as its first argument.
 * See also:
 *    vfs_fill_names().
 */

#define VFS_ENCODING_PREFIX "#enc:"

#define O_ALL (O_CREAT | O_EXCL | O_NOCTTY | O_NDELAY | O_SYNC | O_WRONLY | O_RDWR | O_RDONLY)
/* Midnight commander code should _not_ use other flags than those
   listed above and O_APPEND */

#if (O_ALL & O_APPEND)
#warning "Unexpected problem with flags, O_LINEAR disabled, contact pavel@ucw.cz"
#define O_LINEAR 0
#define IS_LINEAR(a) 0
#define NO_LINEAR(a) a
#else
#define O_LINEAR O_APPEND
#define IS_LINEAR(a) ((a) == (O_RDONLY | O_LINEAR))     /* Return only 0 and 1 ! */
#define NO_LINEAR(a) (((a) == (O_RDONLY | O_LINEAR)) ? O_RDONLY : (a))
#endif

/* O_LINEAR is strange beast, be careful. If you open file asserting
 * O_RDONLY | O_LINEAR, you promise:
 *
 *      a) to read file linearly from beginning to the end
 *      b) not to open another file before you close this one
 *              (this will likely go away in future)
 *      as a special gift, you may
 *      c) lseek() immediately after open(), giving ftpfs chance to
 *         reget. Be warned that this lseek() can fail, and you _have_
 *         to handle that gratefully.
 *
 * O_LINEAR allows filesystems not to create temporary file in some
 * cases (ftp transfer).                                -- pavel@ucw.cz
 */

/* And now some defines for our errors. */

#ifdef ENOSYS
#define E_NOTSUPP ENOSYS        /* for use in vfs when module does not provide function */
#else
#define E_NOTSUPP EFAULT        /* Does this happen? */
#endif

#ifdef ENOMSG
#define E_UNKNOWN ENOMSG        /* if we do not know what error happened */
#else
#define E_UNKNOWN EIO           /* if we do not know what error happened */
#endif

#ifdef EREMOTEIO
#define E_REMOTE EREMOTEIO      /* if other side of ftp/fish reports error */
#else
#define E_REMOTE ENETUNREACH    /* :-( there's no EREMOTEIO on some systems */
#endif

#ifdef EPROTO
#define E_PROTO EPROTO          /* if other side fails to follow protocol */
#else
#define E_PROTO EIO
#endif

typedef void (*fill_names_f) (const char *);

/*** enums ***************************************************************************************/

/* Flags of VFS classes */
typedef enum
{
    VFSF_UNKNOWN = 0,
    VFSF_LOCAL = 1 << 0,        /* Class is local (not virtual) filesystem */
    VFSF_NOLINKS = 1 << 1       /* Hard links not supported */
} vfs_class_flags_t;

/* Operations for mc_ctl - on open file */
enum
{
    VFS_CTL_IS_NOTREADY
};

/* Operations for mc_setctl - on path */
enum
{
    VFS_SETCTL_FORGET,
    VFS_SETCTL_RUN,
    VFS_SETCTL_LOGFILE,
    VFS_SETCTL_FLUSH,           /* invalidate directory cache */

    /* Setting this makes vfs layer give out potentially incorrect data,
       but it also makes some operations much faster. Use with caution. */
    VFS_SETCTL_STALE_DATA
};

/*** structures declarations (and typedefs of structures)*****************************************/

struct vfs_class;

/*** global variables defined in .c file *********************************************************/

extern int vfs_timeout;

#ifdef ENABLE_VFS_NET
extern int use_netrc;
#endif

/*** declarations of public functions ************************************************************/

void vfs_init (void);
void vfs_shut (void);


void vfs_timeout_handler (void);
int vfs_timeouts (void);
void vfs_expire (int now);

gboolean vfs_current_is_local (void);
gboolean vfs_file_is_local (const char *filename);
ssize_t mc_read (int handle, void *buffer, size_t count);
ssize_t mc_write (int handle, const void *buffer, size_t count);
int mc_utime (const char *path, struct utimbuf *times);
int mc_readlink (const char *path, char *buf, size_t bufsiz);
int mc_ungetlocalcopy (const char *pathname, const char *local, int has_changed);
int mc_close (int handle);
off_t mc_lseek (int fd, off_t offset, int whence);
DIR *mc_opendir (const char *dirname);
struct dirent *mc_readdir (DIR * dirp);
int mc_closedir (DIR * dir);
int mc_stat (const char *path, struct stat *buf);
int mc_mknod (const char *path, mode_t mode, dev_t dev);
int mc_link (const char *name1, const char *name2);
int mc_mkdir (const char *path, mode_t mode);
int mc_rmdir (const char *path);
int mc_fstat (int fd, struct stat *buf);
int mc_lstat (const char *path, struct stat *buf);
int mc_symlink (const char *name1, const char *name2);
int mc_rename (const char *original, const char *target);
int mc_chmod (const char *path, mode_t mode);
int mc_chown (const char *path, uid_t owner, gid_t group);
int mc_chdir (const char *path);
int mc_unlink (const char *path);
int mc_ctl (int fd, int ctlop, void *arg);
int mc_setctl (const char *path, int ctlop, void *arg);
int mc_open (const char *filename, int flags, ...);
char *mc_get_current_wd (char *buffer, size_t bufsize);
char *vfs_canon (const char *path);
char *mc_getlocalcopy (const char *pathname);
char *vfs_strip_suffix_from_filename (const char *filename);
char *vfs_translate_url (const char *url);

struct vfs_class *vfs_get_class (const char *path);
vfs_class_flags_t vfs_file_class_flags (const char *filename);

/* return encoding after last #enc: or NULL, if part does not contain #enc:
 * return static buffer */
const char *vfs_get_encoding (const char *path);

/* return new string */
char *vfs_translate_path_n (const char *path);

/* canonize and translate path, return new string */
char *vfs_canon_and_translate (const char *path);

void vfs_stamp_path (const char *path);

void vfs_release_path (const char *dir);

void vfs_fill_names (fill_names_f);

char *vfs_get_current_dir (void);
/* translate path back to terminal encoding, remove all #enc:
 * every invalid character is replaced with question mark
 * return static buffer */
char *vfs_translate_path (const char *path);

/*** inline functions ****************************************************************************/
#endif /* MC_VFS_VFS_H */