mirror of
https://github.com/MidnightCommander/mc
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281 lines
9.0 KiB
C
281 lines
9.0 KiB
C
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/**
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* \file
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* \brief Header: Virtual File System switch code
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*/
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#ifndef MC__VFS_VFS_H
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#define MC__VFS_VFS_H
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <utime.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stddef.h>
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#include "lib/global.h"
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#include "lib/fs.h" /* MC_MAXPATHLEN */
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#include "interface.h"
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/*** typedefs(not structures) and defined constants **********************************************/
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#if defined (ENABLE_VFS_FTP) || defined (ENABLE_VFS_FISH) || defined (ENABLE_VFS_SMB)
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#define ENABLE_VFS_NET 1
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#endif
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/**
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* This is the type of callback function passed to vfs_fill_names.
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* It gets the name of the virtual file system as its first argument.
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* See also:
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* vfs_fill_names().
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*/
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#define VFS_ENCODING_PREFIX "#enc:"
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#define O_ALL (O_CREAT | O_EXCL | O_NOCTTY | O_NDELAY | O_SYNC | O_WRONLY | O_RDWR | O_RDONLY)
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/* Midnight commander code should _not_ use other flags than those
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listed above and O_APPEND */
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#if (O_ALL & O_APPEND)
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#warning "Unexpected problem with flags, O_LINEAR disabled, contact pavel@ucw.cz"
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#define O_LINEAR 0
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#define IS_LINEAR(a) 0
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#define NO_LINEAR(a) a
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#else
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#define O_LINEAR O_APPEND
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#define IS_LINEAR(a) ((a) == (O_RDONLY | O_LINEAR)) /* Return only 0 and 1 ! */
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#define NO_LINEAR(a) (((a) == (O_RDONLY | O_LINEAR)) ? O_RDONLY : (a))
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#endif
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/* O_LINEAR is strange beast, be careful. If you open file asserting
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* O_RDONLY | O_LINEAR, you promise:
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*
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* a) to read file linearly from beginning to the end
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* b) not to open another file before you close this one
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* (this will likely go away in future)
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* as a special gift, you may
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* c) lseek() immediately after open(), giving ftpfs chance to
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* reget. Be warned that this lseek() can fail, and you _have_
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* to handle that gratefully.
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*
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* O_LINEAR allows filesystems not to create temporary file in some
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* cases (ftp transfer). -- pavel@ucw.cz
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*/
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/* And now some defines for our errors. */
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#ifdef ENOSYS
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#define E_NOTSUPP ENOSYS /* for use in vfs when module does not provide function */
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#else
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#define E_NOTSUPP EFAULT /* Does this happen? */
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#endif
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#ifdef ENOMSG
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#define E_UNKNOWN ENOMSG /* if we do not know what error happened */
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#else
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#define E_UNKNOWN EIO /* if we do not know what error happened */
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#endif
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#ifdef EREMOTEIO
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#define E_REMOTE EREMOTEIO /* if other side of ftp/fish reports error */
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#else
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#define E_REMOTE ENETUNREACH /* :-( there's no EREMOTEIO on some systems */
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#endif
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#ifdef EPROTO
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#define E_PROTO EPROTO /* if other side fails to follow protocol */
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#else
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#define E_PROTO EIO
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#endif
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typedef void (*fill_names_f) (const char *);
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typedef void *vfsid;
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/*** enums ***************************************************************************************/
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/* Flags of VFS classes */
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typedef enum
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{
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VFSF_UNKNOWN = 0,
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VFSF_LOCAL = 1 << 0, /* Class is local (not virtual) filesystem */
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VFSF_NOLINKS = 1 << 1 /* Hard links not supported */
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} vfs_class_flags_t;
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/* Operations for mc_ctl - on open file */
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enum
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{
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VFS_CTL_IS_NOTREADY
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};
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/* Operations for mc_setctl - on path */
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enum
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{
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VFS_SETCTL_FORGET,
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VFS_SETCTL_RUN,
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VFS_SETCTL_LOGFILE,
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VFS_SETCTL_FLUSH, /* invalidate directory cache */
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/* Setting this makes vfs layer give out potentially incorrect data,
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but it also makes some operations much faster. Use with caution. */
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VFS_SETCTL_STALE_DATA
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};
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/*** structures declarations (and typedefs of structures)*****************************************/
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typedef struct vfs_class
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{
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const char *name; /* "FIles over SHell" */
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vfs_class_flags_t flags;
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const char *prefix; /* "fish:" */
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void *data; /* this is for filesystem's own use */
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int verrno; /* can't use errno because glibc2 might define errno as function */
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int (*init) (struct vfs_class * me);
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void (*done) (struct vfs_class * me);
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/**
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* The fill_names method shall call the callback function for every
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* filesystem name that this vfs module supports.
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*/
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void (*fill_names) (struct vfs_class * me, fill_names_f);
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/**
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* The which() method shall return the index of the vfs subsystem
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* or -1 if this vfs cannot handle the given pathname.
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*/
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int (*which) (struct vfs_class * me, const char *path);
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void *(*open) (struct vfs_class * me, const char *fname, int flags, mode_t mode);
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int (*close) (void *vfs_info);
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ssize_t (*read) (void *vfs_info, char *buffer, size_t count);
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ssize_t (*write) (void *vfs_info, const char *buf, size_t count);
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void *(*opendir) (struct vfs_class * me, const char *dirname);
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void *(*readdir) (void *vfs_info);
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int (*closedir) (void *vfs_info);
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int (*stat) (struct vfs_class * me, const char *path, struct stat * buf);
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int (*lstat) (struct vfs_class * me, const char *path, struct stat * buf);
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int (*fstat) (void *vfs_info, struct stat * buf);
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int (*chmod) (struct vfs_class * me, const char *path, int mode);
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int (*chown) (struct vfs_class * me, const char *path, uid_t owner, gid_t group);
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int (*utime) (struct vfs_class * me, const char *path, struct utimbuf * times);
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int (*readlink) (struct vfs_class * me, const char *path, char *buf, size_t size);
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int (*symlink) (struct vfs_class * me, const char *n1, const char *n2);
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int (*link) (struct vfs_class * me, const char *p1, const char *p2);
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int (*unlink) (struct vfs_class * me, const char *path);
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int (*rename) (struct vfs_class * me, const char *p1, const char *p2);
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int (*chdir) (struct vfs_class * me, const char *path);
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int (*ferrno) (struct vfs_class * me);
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off_t (*lseek) (void *vfs_info, off_t offset, int whence);
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int (*mknod) (struct vfs_class * me, const char *path, mode_t mode, dev_t dev);
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vfsid (*getid) (struct vfs_class * me, const char *path);
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int (*nothingisopen) (vfsid id);
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void (*free) (vfsid id);
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char *(*getlocalcopy) (struct vfs_class * me, const char *filename);
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int (*ungetlocalcopy) (struct vfs_class * me, const char *filename,
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const char *local, int has_changed);
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int (*mkdir) (struct vfs_class * me, const char *path, mode_t mode);
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int (*rmdir) (struct vfs_class * me, const char *path);
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int (*ctl) (void *vfs_info, int ctlop, void *arg);
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int (*setctl) (struct vfs_class * me, const char *path, int ctlop, void *arg);
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} vfs_class;
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/*
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* This union is used to ensure that there is enough space for the
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* filename (d_name) when the dirent structure is created.
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*/
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union vfs_dirent
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{
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struct dirent dent;
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char _extra_buffer[offsetof (struct dirent, d_name) + MC_MAXPATHLEN + 1];
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};
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/*** global variables defined in .c file *********************************************************/
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extern int vfs_timeout;
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#ifdef ENABLE_VFS_NET
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extern int use_netrc;
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#endif
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/*** declarations of public functions ************************************************************/
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/* lib/vfs/direntry.c: */
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void *vfs_s_open (struct vfs_class *me, const char *file, int flags, mode_t mode);
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vfsid vfs_getid (struct vfs_class *vclass, const char *dir);
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void vfs_init (void);
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void vfs_shut (void);
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/* Register a file system class */
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gboolean vfs_register_class (struct vfs_class *vfs);
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void vfs_setup_work_dir (void);
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void vfs_timeout_handler (void);
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int vfs_timeouts (void);
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void vfs_expire (int now);
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char *vfs_get_current_dir (void);
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gboolean vfs_current_is_local (void);
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gboolean vfs_file_is_local (const char *filename);
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char *vfs_canon (const char *path);
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char *vfs_strip_suffix_from_filename (const char *filename);
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char *vfs_translate_url (const char *url);
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struct vfs_class *vfs_split (char *path, char **inpath, char **op);
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char *vfs_path (const char *path);
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struct vfs_class *vfs_get_class (const char *path);
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vfs_class_flags_t vfs_file_class_flags (const char *filename);
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/* return encoding after last #enc: or NULL, if part does not contain #enc:
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* return static buffer */
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const char *vfs_get_encoding (const char *path);
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/* canonize and translate path, return new string */
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char *vfs_canon_and_translate (const char *path);
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/* translate path back to terminal encoding, remove all #enc:
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* every invalid character is replaced with question mark
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* return static buffer */
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char *vfs_translate_path (const char *path);
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/* return new string */
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char *vfs_translate_path_n (const char *path);
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void vfs_stamp_path (const char *path);
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void vfs_release_path (const char *dir);
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void vfs_fill_names (fill_names_f);
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void vfs_print_message (const char *msg, ...) __attribute__ ((format (__printf__, 1, 2)));
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int vfs_ferrno (struct vfs_class *vfs);
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int vfs_new_handle (struct vfs_class *vclass, void *fsinfo);
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struct vfs_class * vfs_class_find_by_handle (int handle);
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void *vfs_class_data_find_by_handle (int handle);
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void vfs_free_handle (int handle);
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const char *_vfs_get_cwd (void);
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/*** inline functions ****************************************************************************/
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#endif /* MC_VFS_VFS_H */
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