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/*
** LuaFileSystem
** Copyright Kepler Project 2004-2007 (http://www.keplerproject.org/luafilesystem)
**
** File system manipulation library.
** This library offers these functions:
** lfs.attributes (filepath [, attributename])
** lfs.chdir (path)
** lfs.currentdir ()
** lfs.dir (path)
** lfs.lock (fh, mode)
** lfs.mkdir (path)
** lfs.rmdir (path)
** lfs.symlinkattributes (filepath [, attributename]) -- thanks to Sam Roberts
** lfs.touch (filepath [, atime [, mtime]])
** lfs.unlock (fh)
**
** $Id: lfs.c,v 1.42 2007/10/26 21:01:07 carregal Exp $
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/stat.h>
#ifdef _WIN32
#include <direct.h>
#include <io.h>
#include <sys/locking.h>
#include <sys/utime.h>
#else
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/types.h>
#include <utime.h>
#endif
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "lua_wapr.h"
/* Define 'strerror' for systems that do not implement it */
#ifdef NO_STRERROR
#define strerror(_) "System unable to describe the error"
#endif
/* Define 'getcwd' for systems that do not implement it */
#ifdef NO_GETCWD
#define getcwd(p,s) NULL
#define getcwd_error "Function 'getcwd' not provided by system"
#else
#define getcwd_error strerror(errno)
#endif
#define DIR_METATABLE "directory metatable"
#define MAX_DIR_LENGTH 1023
typedef struct dir_data {
int closed;
#ifdef _WIN32
long hFile;
char pattern[MAX_DIR_LENGTH+1];
#else
DIR *dir;
#endif
} dir_data;
/*
** This function changes the working (current) directory
*/
static int change_dir (lua_State *L) {
const char *path = luaL_checkstring(L, 1);
if (chdir(path)) {
lua_pushnil (L);
lua_pushfstring (L,"Unable to change working directory to '%s'\n%s\n",
path, chdir_error);
return 2;
} else {
lua_pushboolean (L, 1);
return 1;
}
}
/*
** This function returns the current directory
** If unable to get the current directory, it returns nil
** and a string describing the error
*/
static int get_dir (lua_State *L) {
char path[255+2];
if (getcwd(path, 255) == NULL) {
lua_pushnil(L);
lua_pushstring(L, getcwd_error);
return 2;
}
else {
lua_pushstring(L, path);
return 1;
}
}
/*
** Check if the given element on the stack is a file and returns it.
*/
static FILE *check_file (lua_State *L, int idx, const char *funcname) {
FILE **fh = (FILE **)luaL_checkudata (L, idx, "FILE*");
if (fh == NULL) {
luaL_error (L, "%s: not a file", funcname);
return 0;
} else if (*fh == NULL) {
luaL_error (L, "%s: closed file", funcname);
return 0;
} else
return *fh;
}
/*
**
*/
static int _file_lock (lua_State *L, FILE *fh, const char *mode, const long start, long len, const char *funcname) {
int code;
#ifdef _WIN32
/* lkmode valid values are:
LK_LOCK Locks the specified bytes. If the bytes cannot be locked, the program immediately tries again after 1 second. If, after 10 attempts, the bytes cannot be locked, the constant returns an error.
LK_NBLCK Locks the specified bytes. If the bytes cannot be locked, the constant returns an error.
LK_NBRLCK Same as _LK_NBLCK.
LK_RLCK Same as _LK_LOCK.
LK_UNLCK Unlocks the specified bytes, which must have been previously locked.
Regions should be locked only briefly and should be unlocked before closing a file or exiting the program.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt__locking.asp
*/
int lkmode;
switch (*mode) {
case 'r': lkmode = LK_NBLCK; break;
case 'w': lkmode = LK_NBLCK; break;
case 'u': lkmode = LK_UNLCK; break;
default : return luaL_error (L, "%s: invalid mode", funcname);
}
if (!len) {
fseek (fh, 0L, SEEK_END);
len = ftell (fh);
}
fseek (fh, start, SEEK_SET);
code = _locking (fileno(fh), lkmode, len);
#else
struct flock f;
switch (*mode) {
case 'w': f.l_type = F_WRLCK; break;
case 'r': f.l_type = F_RDLCK; break;
case 'u': f.l_type = F_UNLCK; break;
default : return luaL_error (L, "%s: invalid mode", funcname);
}
f.l_whence = SEEK_SET;
f.l_start = (off_t)start;
f.l_len = (off_t)len;
code = fcntl (fileno(fh), F_SETLK, &f);
#endif
return (code != -1);
}
/*
** Locks a file.
** @param #1 File handle.
** @param #2 String with lock mode ('w'rite, 'r'ead).
** @param #3 Number with start position (optional).
** @param #4 Number with length (optional).
*/
static int file_lock (lua_State *L) {
FILE *fh = check_file (L, 1, "lock");
const char *mode = luaL_checkstring (L, 2);
const long start = luaL_optlong (L, 3, 0);
long len = luaL_optlong (L, 4, 0);
if (_file_lock (L, fh, mode, start, len, "lock")) {
lua_pushboolean (L, 1);
return 1;
} else {
lua_pushnil (L);
lua_pushfstring (L, "%s", strerror(errno));
return 2;
}
}
/*
** Unlocks a file.
** @param #1 File handle.
** @param #2 Number with start position (optional).
** @param #3 Number with length (optional).
*/
static int file_unlock (lua_State *L) {
FILE *fh = check_file (L, 1, "unlock");
const long start = luaL_optlong (L, 2, 0);
long len = luaL_optlong (L, 3, 0);
if (_file_lock (L, fh, "u", start, len, "unlock")) {
lua_pushboolean (L, 1);
return 1;
} else {
lua_pushnil (L);
lua_pushfstring (L, "%s", strerror(errno));
return 2;
}
}
static int make_dir (lua_State *L) {
const char *path = luaL_checkstring (L, 1);
int fail;
#ifdef _WIN32
int oldmask = umask (0);
fail = _mkdir (path);
#else
mode_t oldmask = umask( (mode_t)0 );
fail = mkdir (path, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP |
S_IWGRP | S_IXGRP | S_IROTH | S_IXOTH );
#endif
if (fail) {
lua_pushnil (L);
lua_pushfstring (L, "%s", strerror(errno));
return 2;
}
umask (oldmask);
lua_pushboolean (L, 1);
return 1;
}
/*
** Removes a directory.
** @param #1 Directory path.
*/
static int remove_dir (lua_State *L) {
const char *path = luaL_checkstring (L, 1);
int fail;
fail = rmdir (path);
if (fail) {
lua_pushnil (L);
lua_pushfstring (L, "%s", strerror(errno));
return 2;
}
lua_pushboolean (L, 1);
return 1;
}
/*
** Directory iterator
*/
static int dir_iter (lua_State *L) {
#ifdef _WIN32
struct _finddata_t c_file;
#else
struct dirent *entry;
#endif
dir_data *d = (dir_data *)lua_touserdata (L, lua_upvalueindex (1));
luaL_argcheck (L, !d->closed, 1, "closed directory");
#ifdef _WIN32
if (d->hFile == 0L) { /* first entry */
if ((d->hFile = _findfirst (d->pattern, &c_file)) == -1L) {
lua_pushnil (L);
lua_pushstring (L, strerror (errno));
return 2;
} else {
lua_pushstring (L, c_file.name);
return 1;
}
} else { /* next entry */
if (_findnext (d->hFile, &c_file) == -1L) {
/* no more entries => close directory */
_findclose (d->hFile);
d->closed = 1;
return 0;
} else {
lua_pushstring (L, c_file.name);
return 1;
}
}
#else
if ((entry = readdir (d->dir)) != NULL) {
lua_pushstring (L, entry->d_name);
return 1;
} else {
/* no more entries => close directory */
closedir (d->dir);
d->closed = 1;
return 0;
}
#endif
}
/*
** Closes directory iterators
*/
static int dir_close (lua_State *L) {
dir_data *d = (dir_data *)lua_touserdata (L, 1);
#ifdef _WIN32
if (!d->closed && d->hFile) {
_findclose (d->hFile);
d->closed = 1;
}
#else
if (!d->closed && d->dir) {
closedir (d->dir);
d->closed = 1;
}
#endif
return 0;
}
/*
** Factory of directory iterators
*/
static int dir_iter_factory (lua_State *L) {
const char *path = luaL_checkstring (L, 1);
dir_data *d = (dir_data *) lua_newuserdata (L, sizeof(dir_data));
d->closed = 0;
#ifdef _WIN32
d->hFile = 0L;
luaL_getmetatable (L, DIR_METATABLE);
lua_setmetatable (L, -2);
if (strlen(path) > MAX_DIR_LENGTH)
luaL_error (L, "path too long: %s", path);
else
sprintf (d->pattern, "%s/*", path);
#else
luaL_getmetatable (L, DIR_METATABLE);
lua_setmetatable (L, -2);
d->dir = opendir (path);
if (d->dir == NULL)
luaL_error (L, "cannot open %s: %s", path, strerror (errno));
#endif
lua_pushcclosure (L, dir_iter, 1);
return 1;
}
/*
** Creates directory metatable.
*/
static int dir_create_meta (lua_State *L) {
luaL_newmetatable (L, DIR_METATABLE);
/* set its __gc field */
lua_pushstring (L, "__gc");
lua_pushcfunction (L, dir_close);
lua_settable (L, -3);
return 1;
}
#ifdef _WIN32
#ifndef S_ISDIR
#define S_ISDIR(mode) (mode&_S_IFDIR)
#endif
#ifndef S_ISREG
#define S_ISREG(mode) (mode&_S_IFREG)
#endif
#ifndef S_ISLNK
#define S_ISLNK(mode) (0)
#endif
#ifndef S_ISSOCK
#define S_ISSOCK(mode) (0)
#endif
#ifndef S_ISFIFO
#define S_ISFIFO(mode) (0)
#endif
#ifndef S_ISCHR
#define S_ISCHR(mode) (mode&_S_IFCHR)
#endif
#ifndef S_ISBLK
#define S_ISBLK(mode) (0)
#endif
#endif
/*
** Convert the inode protection mode to a string.
*/
#ifdef _WIN32
static const char *mode2string (unsigned short mode) {
#else
static const char *mode2string (mode_t mode) {
#endif
if ( S_ISREG(mode) )
return "file";
else if ( S_ISDIR(mode) )
return "directory";
else if ( S_ISLNK(mode) )
return "link";
else if ( S_ISSOCK(mode) )
return "socket";
else if ( S_ISFIFO(mode) )
return "named pipe";
else if ( S_ISCHR(mode) )
return "char device";
else if ( S_ISBLK(mode) )
return "block device";
else
return "other";
}
/*
** Set access time and modification values for file
*/
static int file_utime (lua_State *L) {
const char *file = luaL_checkstring (L, 1);
struct utimbuf utb, *buf;
if (lua_gettop (L) == 1) /* set to current date/time */
buf = NULL;
else {
utb.actime = (time_t)luaL_optnumber (L, 2, 0);
utb.modtime = (time_t)luaL_optnumber (L, 3, utb.actime);
buf = &utb;
}
if (utime (file, buf)) {
lua_pushnil (L);
lua_pushfstring (L, "%s", strerror (errno));
return 2;
}
lua_pushboolean (L, 1);
return 1;
}
/* inode protection mode */
static void push_st_mode (lua_State *L, struct stat *info) {
lua_pushstring (L, mode2string (info->st_mode));
}
/* device inode resides on */
static void push_st_dev (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_dev);
}
/* inode's number */
static void push_st_ino (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_ino);
}
/* number of hard links to the file */
static void push_st_nlink (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_nlink);
}
/* user-id of owner */
static void push_st_uid (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_uid);
}
/* group-id of owner */
static void push_st_gid (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_gid);
}
/* device type, for special file inode */
static void push_st_rdev (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_rdev);
}
/* time of last access */
static void push_st_atime (lua_State *L, struct stat *info) {
lua_pushnumber (L, info->st_atime);
}
/* time of last data modification */
static void push_st_mtime (lua_State *L, struct stat *info) {
lua_pushnumber (L, info->st_mtime);
}
/* time of last file status change */
static void push_st_ctime (lua_State *L, struct stat *info) {
lua_pushnumber (L, info->st_ctime);
}
/* file size, in bytes */
static void push_st_size (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_size);
}
#ifndef _WIN32
/* blocks allocated for file */
static void push_st_blocks (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_blocks);
}
/* optimal file system I/O blocksize */
static void push_st_blksize (lua_State *L, struct stat *info) {
lua_pushnumber (L, (lua_Number)info->st_blksize);
}
#endif
typedef void (*_push_function) (lua_State *L, struct stat *info);
struct _stat_members {
const char *name;
_push_function push;
};
struct _stat_members members[] = {
{ "mode", push_st_mode },
{ "dev", push_st_dev },
{ "ino", push_st_ino },
{ "nlink", push_st_nlink },
{ "uid", push_st_uid },
{ "gid", push_st_gid },
{ "rdev", push_st_rdev },
{ "access", push_st_atime },
{ "modification", push_st_mtime },
{ "change", push_st_ctime },
{ "size", push_st_size },
#ifndef _WIN32
{ "blocks", push_st_blocks },
{ "blksize", push_st_blksize },
#endif
{ NULL, NULL }
};
/*
** Get file or symbolic link information
*/
static int _file_info_ (lua_State *L, int (*st)(const char*, struct stat*)) {
int i;
struct stat info;
const char *file = luaL_checkstring (L, 1);
if (st(file, &info)) {
lua_pushnil (L);
lua_pushfstring (L, "cannot obtain information from file `%s'", file);
return 2;
}
if (lua_isstring (L, 2)) {
int v;
const char *member = lua_tostring (L, 2);
if (strcmp (member, "mode") == 0) v = 0;
#ifndef _WIN32
else if (strcmp (member, "blocks") == 0) v = 11;
else if (strcmp (member, "blksize") == 0) v = 12;
#endif
else /* look for member */
for (v = 1; members[v].name; v++)
if (*members[v].name == *member)
break;
/* push member value and return */
members[v].push (L, &info);
return 1;
} else if (!lua_istable (L, 2))
/* creates a table if none is given */
lua_newtable (L);
/* stores all members in table on top of the stack */
for (i = 0; members[i].name; i++) {
lua_pushstring (L, members[i].name);
members[i].push (L, &info);
lua_rawset (L, -3);
}
return 1;
}
/*
** Get file information using stat.
*/
static int file_info (lua_State *L) {
return _file_info_ (L, stat);
}
/*
** Get symbolic link information using lstat.
*/
#ifndef _WIN32
static int link_info (lua_State *L) {
return _file_info_ (L, lstat);
}
#endif
/*
** Assumes the table is on top of the stack.
*/
static void set_info (lua_State *L) {
lua_pushliteral (L, "_COPYRIGHT");
lua_pushliteral (L, "Copyright (C) 2003-2007 Kepler Project");
lua_settable (L, -3);
lua_pushliteral (L, "_DESCRIPTION");
lua_pushliteral (L, "LuaFileSystem is a Lua library developed to complement the set of functions related to file systems offered by the standard Lua distribution");
lua_settable (L, -3);
lua_pushliteral (L, "_VERSION");
lua_pushliteral (L, "LuaFileSystem 1.3.0");
lua_settable (L, -3);
}
static const struct luaL_reg fslib[] = {
{"attributes", file_info},
{"chdir", change_dir},
{"currentdir", get_dir},
{"dir", dir_iter_factory},
{"lock", file_lock},
{"mkdir", make_dir},
{"rmdir", remove_dir},
#ifndef _WIN32
{"symlinkattributes", link_info},
#endif
{"touch", file_utime},
{"unlock", file_unlock},
{NULL, NULL},
};
void luaopen_wapr (lua_State *L) {
dir_create_meta (L);
luaL_register (L, "apr", fslib);
set_info (L);
}