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/*
* This file is covered by the Ruby license. See COPYING for more details.
*
* Copyright (C) 2012, The MacRuby Team. All rights reserved.
* Copyright (C) 2007-2011, Apple Inc. All rights reserved.
* Copyright (C) 1993-2007 Yukihiro Matsumoto
* Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
* Copyright (C) 2000 Information-technology Promotion Agency, Japan
*/

#include "macruby_internal.h"
#include "ruby/io.h"
#include "ruby/signal.h"
#include "ruby/util.h"
#include "ruby/node.h"
#include "dln.h"
#include "objc.h"
#include "vm.h"
#include "encoding.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_SYS_FILE_H
# include <sys/file.h>
#else
int flock(int, int);
#endif

#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifndef MAXPATHLEN
# define MAXPATHLEN 1024
#endif

#include <ctype.h>

#include <time.h>

#ifdef HAVE_UTIME_H
#include <utime.h>
#elif defined HAVE_SYS_UTIME_H
#include <sys/utime.h>
#endif

#ifdef HAVE_PWD_H
#include <pwd.h>
#endif

#include <sys/types.h>
#include <sys/stat.h>

#ifdef HAVE_SYS_MKDEV_H
#include <sys/mkdev.h>
#endif

#if defined(HAVE_FCNTL_H)
#include <fcntl.h>
#endif

#if !defined HAVE_LSTAT && !defined lstat
#define lstat stat
#endif

#ifdef __BEOS__ /* should not change ID if -1 */
static int
be_chown(const char *path, uid_t owner, gid_t group)
{
    if (owner == (uid_t)-1 || group == (gid_t)-1) {
struct stat st;
if (stat(path, &st) < 0) return -1;
if (owner == (uid_t)-1) owner = st.st_uid;
if (group == (gid_t)-1) group = st.st_gid;
    }
    return chown(path, owner, group);
}
#define chown be_chown
static int
be_fchown(int fd, uid_t owner, gid_t group)
{
    if (owner == (uid_t)-1 || group == (gid_t)-1) {
struct stat st;
if (fstat(fd, &st) < 0) return -1;
if (owner == (uid_t)-1) owner = st.st_uid;
if (group == (gid_t)-1) group = st.st_gid;
    }
    return fchown(fd, owner, group);
}
#define fchown be_fchown
#endif /* __BEOS__ */

VALUE rb_cFile;
VALUE rb_mFileTest;
VALUE rb_cStat;

static SEL selToPath = 0;

#define insecure_obj_p(obj, level) (level >= 4 || (level > 0 && OBJ_TAINTED(obj)))

static VALUE
rb_get_path_check(VALUE obj, int level)
{
    VALUE tmp;

    if (insecure_obj_p(obj, level)) {
rb_insecure_operation();
    }

    tmp = rb_vm_check_call(obj, selToPath, 0, NULL);
    if (tmp == Qundef) {
tmp = obj;
    }
    StringValue(tmp);

    StringValueCStr(tmp);
    if (obj != tmp && insecure_obj_p(tmp, level)) {
rb_insecure_operation();
    }
    return rb_str_new4(tmp);
}

VALUE
rb_get_path_no_checksafe(VALUE obj)
{
    return rb_get_path_check(obj, 0);
}

VALUE
rb_get_path(VALUE obj)
{
    return rb_get_path_check(obj, rb_safe_level());
}

VALUE
rb_str_encode_ospath(VALUE path)
{
#ifdef _WIN32
    rb_encoding *enc = rb_enc_get(path);
    if (enc != rb_ascii8bit_encoding()) {
rb_encoding *utf8 = rb_utf8_encoding();
if (enc != utf8)
path = rb_str_encode(path, rb_enc_from_encoding(utf8), 0, Qnil);
    }
    else if (RSTRING_LEN(path) > 0) {
path = rb_str_dup(path);
rb_enc_associate(path, rb_filesystem_encoding());
path = rb_str_encode(path, rb_enc_from_encoding(rb_utf8_encoding()), 0, Qnil);
    }
#endif
    return path;
}

static long
apply2files(void (*func)(const char *, void *), long argc, VALUE *argv,
void *arg)
{
    rb_secure(4);
    for (long i = 0; i < argc; i++) {
VALUE path = rb_get_path(argv[i]);
path = rb_str_encode_ospath(path);
(*func)(StringValueCStr(path), arg);
    }
    return argc;
}

/*
* call-seq:
* file.path -> filename
*
* Returns the pathname used to create <i>file</i> as a string. Does
* not normalize the name.
*
* File.new("testfile").path #=> "testfile"
* File.new("/tmp/../tmp/xxx", "w").path #=> "/tmp/../tmp/xxx"
*
*/

static VALUE
rb_file_path(VALUE obj, SEL sel)
{
    rb_io_t *io = ExtractIOStruct(rb_io_taint_check(obj));
    rb_io_check_initialized(io);
    if (io->path == 0) {
return Qnil;
    }
    return rb_obj_taint(rb_str_dup(io->path));
}

static VALUE
stat_new_0(VALUE klass, struct stat *st)
{
    struct stat *nst = 0;

    if (st != NULL) {
nst = ALLOC(struct stat);
*nst = *st;
    }
    return Data_Wrap_Struct(klass, NULL, NULL, nst);
}

static VALUE
stat_new(struct stat *st)
{
    return stat_new_0(rb_cStat, st);
}

static struct stat*
get_stat(VALUE self)
{
    struct stat* st;
    Data_Get_Struct(self, struct stat, st);
    if (!st) rb_raise(rb_eTypeError, "uninitialized File::Stat");
    return st;
}

static struct timespec stat_mtimespec(struct stat *st);

/*
* call-seq:
* stat <=> other_stat -> -1, 0, 1, nil
*
* Compares <code>File::Stat</code> objects by comparing their
* respective modification times.
*
* f1 = File.new("f1", "w")
* sleep 1
* f2 = File.new("f2", "w")
* f1.stat <=> f2.stat #=> -1
*/

static VALUE
rb_stat_cmp(VALUE self, SEL sel, VALUE other)
{
    if (rb_obj_is_kind_of(other, rb_obj_class(self))) {
        struct timespec ts1 = stat_mtimespec(get_stat(self));
        struct timespec ts2 = stat_mtimespec(get_stat(other));
        if (ts1.tv_sec == ts2.tv_sec) {
            if (ts1.tv_nsec == ts2.tv_nsec) return INT2FIX(0);
            if (ts1.tv_nsec < ts2.tv_nsec) return INT2FIX(-1);
            return INT2FIX(1);
        }
        if (ts1.tv_sec < ts2.tv_sec) return INT2FIX(-1);
        return INT2FIX(1);
    }
    return Qnil;
}

#define ST2UINT(val) ((val) & ~(~1UL << (sizeof(val) * CHAR_BIT - 1)))

/*
* call-seq:
* stat.dev -> fixnum
*
* Returns an integer representing the device on which <i>stat</i>
* resides.
*
* File.stat("testfile").dev #=> 774
*/

static VALUE
rb_stat_dev(VALUE self, SEL sel)
{
    return INT2NUM(get_stat(self)->st_dev);
}

/*
* call-seq:
* stat.dev_major -> fixnum
*
* Returns the major part of <code>File_Stat#dev</code> or
* <code>nil</code>.
*
* File.stat("/dev/fd1").dev_major #=> 2
* File.stat("/dev/tty").dev_major #=> 5
*/

static VALUE
rb_stat_dev_major(VALUE self, SEL sel)
{
#if defined(major)
    long dev = get_stat(self)->st_dev;
    return ULONG2NUM(major(dev));
#else
    return Qnil;
#endif
}

/*
* call-seq:
* stat.dev_minor -> fixnum
*
* Returns the minor part of <code>File_Stat#dev</code> or
* <code>nil</code>.
*
* File.stat("/dev/fd1").dev_minor #=> 1
* File.stat("/dev/tty").dev_minor #=> 0
*/

static VALUE
rb_stat_dev_minor(VALUE self, SEL sel)
{
#if defined(minor)
    long dev = get_stat(self)->st_dev;
    return ULONG2NUM(minor(dev));
#else
    return Qnil;
#endif
}


/*
* call-seq:
* stat.ino -> fixnum
*
* Returns the inode number for <i>stat</i>.
*
* File.stat("testfile").ino #=> 1083669
*
*/

static VALUE
rb_stat_ino(VALUE self, SEL sel)
{
#ifdef HUGE_ST_INO
    return ULL2NUM(get_stat(self)->st_ino);
#else
    return ULONG2NUM(get_stat(self)->st_ino);
#endif
}

/*
* call-seq:
* stat.mode -> fixnum
*
* Returns an integer representing the permission bits of
* <i>stat</i>. The meaning of the bits is platform dependent; on
* Unix systems, see <code>stat(2)</code>.
*
* File.chmod(0644, "testfile") #=> 1
* s = File.stat("testfile")
* sprintf("%o", s.mode) #=> "100644"
*/

static VALUE
rb_stat_mode(VALUE self, SEL sel)
{
    return UINT2NUM(ST2UINT(get_stat(self)->st_mode));
}

/*
* call-seq:
* stat.nlink -> fixnum
*
* Returns the number of hard links to <i>stat</i>.
*
* File.stat("testfile").nlink #=> 1
* File.link("testfile", "testfile.bak") #=> 0
* File.stat("testfile").nlink #=> 2
*
*/

static VALUE
rb_stat_nlink(VALUE self, SEL sel)
{
    return UINT2NUM(get_stat(self)->st_nlink);
}

/*
* call-seq:
* stat.uid -> fixnum
*
* Returns the numeric user id of the owner of <i>stat</i>.
*
* File.stat("testfile").uid #=> 501
*
*/

static VALUE
rb_stat_uid(VALUE self, SEL sel)
{
    return UIDT2NUM(get_stat(self)->st_uid);
}

/*
* call-seq:
* stat.gid -> fixnum
*
* Returns the numeric group id of the owner of <i>stat</i>.
*
* File.stat("testfile").gid #=> 500
*
*/

static VALUE
rb_stat_gid(VALUE self, SEL sel)
{
    return GIDT2NUM(get_stat(self)->st_gid);
}

/*
* call-seq:
* stat.rdev -> fixnum or nil
*
* Returns an integer representing the device type on which
* <i>stat</i> resides. Returns <code>nil</code> if the operating
* system doesn't support this feature.
*
* File.stat("/dev/fd1").rdev #=> 513
* File.stat("/dev/tty").rdev #=> 1280
*/

static VALUE
rb_stat_rdev(VALUE self, SEL sel)
{
#ifdef HAVE_ST_RDEV
    return ULONG2NUM(get_stat(self)->st_rdev);
#else
    return Qnil;
#endif
}

/*
* call-seq:
* stat.rdev_major -> fixnum
*
* Returns the major part of <code>File_Stat#rdev</code> or
* <code>nil</code>.
*
* File.stat("/dev/fd1").rdev_major #=> 2
* File.stat("/dev/tty").rdev_major #=> 5
*/

static VALUE
rb_stat_rdev_major(VALUE self, SEL sel)
{
#if defined(HAVE_ST_RDEV) && defined(major)
    long rdev = get_stat(self)->st_rdev;
    return ULONG2NUM(major(rdev));
#else
    return Qnil;
#endif
}

/*
* call-seq:
* stat.rdev_minor -> fixnum
*
* Returns the minor part of <code>File_Stat#rdev</code> or
* <code>nil</code>.
*
* File.stat("/dev/fd1").rdev_minor #=> 1
* File.stat("/dev/tty").rdev_minor #=> 0
*/

static VALUE
rb_stat_rdev_minor(VALUE self, SEL sel)
{
#if defined(HAVE_ST_RDEV) && defined(minor)
    long rdev = get_stat(self)->st_rdev;
    return ULONG2NUM(minor(rdev));
#else
    return Qnil;
#endif
}

/*
* call-seq:
* stat.size -> fixnum
*
* Returns the size of <i>stat</i> in bytes.
*
* File.stat("testfile").size #=> 66
*/

static VALUE
rb_stat_size(VALUE self, SEL sel)
{
    return OFFT2NUM(get_stat(self)->st_size);
}

/*
* call-seq:
* stat.blksize -> integer or nil
*
* Returns the native file system's block size. Will return <code>nil</code>
* on platforms that don't support this information.
*
* File.stat("testfile").blksize #=> 4096
*
*/

static VALUE
rb_stat_blksize(VALUE self, SEL sel)
{
#ifdef HAVE_ST_BLKSIZE
    return ULONG2NUM(get_stat(self)->st_blksize);
#else
    return Qnil;
#endif
}

/*
* call-seq:
* stat.blocks -> integer or nil
*
* Returns the number of native file system blocks allocated for this
* file, or <code>nil</code> if the operating system doesn't
* support this feature.
*
* File.stat("testfile").blocks #=> 2
*/

static VALUE
rb_stat_blocks(VALUE self, SEL sel)
{
#ifdef HAVE_ST_BLOCKS
    return ULONG2NUM(get_stat(self)->st_blocks);
#else
    return Qnil;
#endif
}

static struct timespec
stat_atimespec(struct stat *st)
{
    struct timespec ts;
    ts.tv_sec = st->st_atime;
#if defined(HAVE_STRUCT_STAT_ST_ATIM)
    ts.tv_nsec = st->st_atim.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_ATIMESPEC)
    ts.tv_nsec = st->st_atimespec.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC)
    ts.tv_nsec = st->st_atimensec;
#else
    ts.tv_nsec = 0;
#endif
    return ts;
}

static VALUE
stat_atime(struct stat *st)
{
    struct timespec ts = stat_atimespec(st);
    return rb_time_nano_new(ts.tv_sec, ts.tv_nsec);
}

static struct timespec
stat_mtimespec(struct stat *st)
{
    struct timespec ts;
    ts.tv_sec = st->st_mtime;
#if defined(HAVE_STRUCT_STAT_ST_MTIM)
    ts.tv_nsec = st->st_mtim.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC)
    ts.tv_nsec = st->st_mtimespec.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
    ts.tv_nsec = st->st_mtimensec;
#else
    ts.tv_nsec = 0;
#endif
    return ts;
}

static VALUE
stat_mtime(struct stat *st)
{
    struct timespec ts = stat_mtimespec(st);
    return rb_time_nano_new(ts.tv_sec, ts.tv_nsec);
}

static struct timespec
stat_ctimespec(struct stat *st)
{
    struct timespec ts;
    ts.tv_sec = st->st_ctime;
#if defined(HAVE_STRUCT_STAT_ST_CTIM)
    ts.tv_nsec = st->st_ctim.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_CTIMESPEC)
    ts.tv_nsec = st->st_ctimespec.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_CTIMENSEC)
    ts.tv_nsec = st->st_ctimensec;
#else
    ts.tv_nsec = 0;
#endif
    return ts;
}

static VALUE
stat_ctime(struct stat *st)
{
    struct timespec ts = stat_ctimespec(st);
    return rb_time_nano_new(ts.tv_sec, ts.tv_nsec);
}

/*
* call-seq:
* stat.atime -> time
*
* Returns the last access time for this file as an object of class
* <code>Time</code>.
*
* File.stat("testfile").atime #=> Wed Dec 31 18:00:00 CST 1969
*
*/

static VALUE
rb_stat_atime(VALUE self, SEL sel)
{
    return stat_atime(get_stat(self));
}

/*
* call-seq:
* stat.mtime -> aTime
*
* Returns the modification time of <i>stat</i>.
*
* File.stat("testfile").mtime #=> Wed Apr 09 08:53:14 CDT 2003
*
*/

static VALUE
rb_stat_mtime(VALUE self, SEL sel)
{
    return stat_mtime(get_stat(self));
}

/*
* call-seq:
* stat.ctime -> aTime
*
* Returns the change time for <i>stat</i> (that is, the time
* directory information about the file was changed, not the file
* itself).
*
* File.stat("testfile").ctime #=> Wed Apr 09 08:53:14 CDT 2003
*
*/

static VALUE
rb_stat_ctime(VALUE self, SEL sel)
{
    return stat_ctime(get_stat(self));
}

/*
* call-seq:
* stat.inspect -> string
*
* Produce a nicely formatted description of <i>stat</i>.
*
* File.stat("/etc/passwd").inspect
* #=> "#<File::Stat dev=0xe000005, ino=1078078, mode=0100644,
* # nlink=1, uid=0, gid=0, rdev=0x0, size=1374, blksize=4096,
* # blocks=8, atime=Wed Dec 10 10:16:12 CST 2003,
* # mtime=Fri Sep 12 15:41:41 CDT 2003,
* # ctime=Mon Oct 27 11:20:27 CST 2003>"
*/

static VALUE
rb_stat_inspect(VALUE self, SEL sel)
{
    VALUE str;
    int i;
    static const struct {
const char *name;
VALUE (*func)(VALUE, SEL);
    } member[] = {
{"dev", rb_stat_dev},
{"ino", rb_stat_ino},
{"mode", rb_stat_mode},
{"nlink", rb_stat_nlink},
{"uid", rb_stat_uid},
{"gid", rb_stat_gid},
{"rdev", rb_stat_rdev},
{"size", rb_stat_size},
{"blksize", rb_stat_blksize},
{"blocks", rb_stat_blocks},
{"atime", rb_stat_atime},
{"mtime", rb_stat_mtime},
{"ctime", rb_stat_ctime},
    };

    struct stat* st;
    Data_Get_Struct(self, struct stat, st);
    if (!st) {
        return rb_sprintf("#<%s: uninitialized>", rb_obj_classname(self));
    }

    str = rb_str_buf_new2("#<");
    rb_str_buf_cat2(str, rb_obj_classname(self));
    rb_str_buf_cat2(str, " ");

    for (i = 0; i < sizeof(member)/sizeof(member[0]); i++) {
VALUE v;

if (i > 0) {
rb_str_buf_cat2(str, ", ");
}
rb_str_buf_cat2(str, member[i].name);
rb_str_buf_cat2(str, "=");
v = (*member[i].func)(self, 0);
if (i == 2) { /* mode */
char buf[32];

snprintf(buf, sizeof(buf), "0%lo", NUM2ULONG(v));
rb_str_buf_cat2(str, buf);
}
else if (i == 0 || i == 6) { /* dev/rdev */
char buf[32];

snprintf(buf, sizeof(buf), "0x%lx", NUM2ULONG(v));
rb_str_buf_cat2(str, buf);
}
else {
rb_str_append(str, rb_inspect(v));
}
    }
    rb_str_buf_cat2(str, ">");
    OBJ_INFECT(str, self);

    return str;
}

static int
rb_stat(VALUE file, struct stat *st)
{
    rb_secure(2);
    VALUE tmp = rb_check_convert_type(file, T_FILE, "IO", "to_io");
    if (!NIL_P(tmp)) {
rb_io_t *io;

GetOpenFile(tmp, io);
return fstat(io->fd, st);
    }
    FilePathValue(file);
    file = rb_str_encode_ospath(file);
    return stat(StringValueCStr(file), st);
}

/*
* call-seq:
* File.stat(file_name) -> stat
*
* Returns a <code>File::Stat</code> object for the named file (see
* <code>File::Stat</code>).
*
* File.stat("testfile").mtime #=> Tue Apr 08 12:58:04 CDT 2003
*
*/

static VALUE
rb_file_s_stat(VALUE klass, SEL sel, VALUE fname)
{
    struct stat st;

    rb_secure(4);
    FilePathValue(fname);
    if (rb_stat(fname, &st) < 0) {
rb_sys_fail(RSTRING_PTR(fname));
    }
    return stat_new(&st);
}

/*
* call-seq:
* ios.stat -> stat
*
* Returns status information for <em>ios</em> as an object of type
* <code>File::Stat</code>.
*
* f = File.new("testfile")
* s = f.stat
* "%o" % s.mode #=> "100644"
* s.blksize #=> 4096
* s.atime #=> Wed Apr 09 08:53:54 CDT 2003
*
*/

static VALUE
rb_io_stat(VALUE obj, SEL sel)
{
    rb_io_t *io;
    struct stat st;

#define rb_sys_fail_path(path) rb_sys_fail(path == 0 ? NULL : RSTRING_PTR(path))
    GetOpenFile(obj, io);
    if (fstat(io->fd, &st) == -1) {
rb_sys_fail_path(io->path);
    }
    return stat_new(&st);
}

/*
* call-seq:
* File.lstat(file_name) -> stat
*
* Same as <code>File::stat</code>, but does not follow the last symbolic
* link. Instead, reports on the link itself.
*
* File.symlink("testfile", "link2test") #=> 0
* File.stat("testfile").size #=> 66
* File.lstat("link2test").size #=> 8
* File.stat("link2test").size #=> 66
*
*/

static VALUE
rb_file_s_lstat(VALUE klass, SEL sel, VALUE fname)
{
#ifdef HAVE_LSTAT
    struct stat st;

    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (lstat(StringValueCStr(fname), &st) == -1) {
rb_sys_fail(RSTRING_PTR(fname));
    }
    return stat_new(&st);
#else
    return rb_file_s_stat(klass, 0, fname);
#endif
}

/*
* call-seq:
* file.lstat -> stat
*
* Same as <code>IO#stat</code>, but does not follow the last symbolic
* link. Instead, reports on the link itself.
*
* File.symlink("testfile", "link2test") #=> 0
* File.stat("testfile").size #=> 66
* f = File.new("link2test")
* f.lstat.size #=> 8
* f.stat.size #=> 66
*/

static VALUE
rb_file_lstat(VALUE obj, SEL sel)
{
#ifdef HAVE_LSTAT
    rb_io_t *io;
    struct stat st;
    VALUE path;

    rb_secure(2);
    GetOpenFile(obj, io);
    if (io->path == 0) {
return Qnil;
    }
    path = rb_str_encode_ospath(io->path);
    if (lstat(RSTRING_PTR(path), &st) == -1) {
rb_sys_fail_path(io->path);
    }
    return stat_new(&st);
#else
    return rb_io_stat(obj);
#endif
}

#ifndef HAVE_GROUP_MEMBER
static int
group_member(GETGROUPS_T gid)
{
#ifndef _WIN32
    if (getgid() == gid || getegid() == gid)
return TRUE;

# ifdef HAVE_GETGROUPS
# ifndef NGROUPS
# ifdef NGROUPS_MAX
# define NGROUPS NGROUPS_MAX
# else
# define NGROUPS 32
# endif
# endif
    {
GETGROUPS_T gary[NGROUPS];
int anum;

anum = getgroups(NGROUPS, gary);
while (--anum >= 0)
if (gary[anum] == gid)
return TRUE;
    }
# endif
#endif
    return FALSE;
}
#endif

#ifndef S_IXUGO
# define S_IXUGO (S_IXUSR | S_IXGRP | S_IXOTH)
#endif

#if defined(S_IXGRP) && !defined(_WIN32) && !defined(__CYGWIN__)
#define USE_GETEUID 1
#endif

#ifndef HAVE_EACCESS
int
eaccess(const char *path, int mode)
{
#ifdef USE_GETEUID
    struct stat st;
    rb_uid_t euid;

    if (stat(path, &st) < 0) {
return -1;
    }

    euid = geteuid();

    if (euid == 0) {
/* Root can read or write any file. */
if (!(mode & X_OK)) {
return 0;
}

/* Root can execute any file that has any one of the execute
bits set. */
if (st.st_mode & S_IXUGO) {
return 0;
}

return -1;
    }

    if (st.st_uid == euid) { /* owner */
mode <<= 6;
    }
    else if (group_member(st.st_gid)) {
mode <<= 3;
    }

    if ((int)(st.st_mode & mode) == mode) {
return 0;
    }

    return -1;
#else
    return access(path, mode);
#endif
}
#endif

static inline int
access_internal(const char *path, int mode)
{
    return access(path, mode);
}


/*
* Document-class: FileTest
*
* <code>FileTest</code> implements file test operations similar to
* those used in <code>File::Stat</code>. It exists as a standalone
* module, and its methods are also insinuated into the <code>File</code>
* class. (Note that this is not done by inclusion: the interpreter cheats).
*
*/

/*
* Document-method: exist?
*
* call-seq:
* Dir.exist?(file_name) -> true or false
* Dir.exists?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is a directory,
* <code>false</code> otherwise.
*
*/

/*
* Document-method: directory?
*
* call-seq:
* File.directory?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is a directory,
* or a symlink that points at a directory, and <code>false</code>
* otherwise.
*
* File.directory?(".")
*/

VALUE
rb_file_directory_p(VALUE obj, SEL sel, VALUE fname)
{
#ifndef S_ISDIR
# define S_ISDIR(m) ((m & S_IFMT) == S_IFDIR)
#endif

    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (S_ISDIR(st.st_mode)) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* File.pipe?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is a pipe.
*/

static VALUE
rb_file_pipe_p(VALUE obj, SEL sel, VALUE fname)
{
#ifdef S_IFIFO
# ifndef S_ISFIFO
# define S_ISFIFO(m) ((m & S_IFMT) == S_IFIFO)
# endif

    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (S_ISFIFO(st.st_mode)) return Qtrue;

#endif
    return Qfalse;
}

/*
* call-seq:
* File.symlink?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is a symbolic link.
*/

static VALUE
rb_file_symlink_p(VALUE obj, SEL sel, VALUE fname)
{
#ifndef S_ISLNK
# ifdef _S_ISLNK
# define S_ISLNK(m) _S_ISLNK(m)
# else
# ifdef _S_IFLNK
# define S_ISLNK(m) ((m & S_IFMT) == _S_IFLNK)
# else
# ifdef S_IFLNK
# define S_ISLNK(m) ((m & S_IFMT) == S_IFLNK)
# endif
# endif
# endif
#endif

#ifdef S_ISLNK
    struct stat st;

    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (lstat(StringValueCStr(fname), &st) < 0) return Qfalse;
    if (S_ISLNK(st.st_mode)) return Qtrue;
#endif

    return Qfalse;
}

/*
* call-seq:
* File.socket?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is a socket.
*/

static VALUE
rb_file_socket_p(VALUE obj, SEL sel, VALUE fname)
{
#ifndef S_ISSOCK
# ifdef _S_ISSOCK
# define S_ISSOCK(m) _S_ISSOCK(m)
# else
# ifdef _S_IFSOCK
# define S_ISSOCK(m) ((m & S_IFMT) == _S_IFSOCK)
# else
# ifdef S_IFSOCK
# define S_ISSOCK(m) ((m & S_IFMT) == S_IFSOCK)
# endif
# endif
# endif
#endif

#ifdef S_ISSOCK
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (S_ISSOCK(st.st_mode)) return Qtrue;

#endif
    return Qfalse;
}

/*
* call-seq:
* File.blockdev?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is a block device.
*/

static VALUE
rb_file_blockdev_p(VALUE obj, SEL sel, VALUE fname)
{
#ifndef S_ISBLK
# ifdef S_IFBLK
# define S_ISBLK(m) ((m & S_IFMT) == S_IFBLK)
# else
# define S_ISBLK(m) (0) /* anytime false */
# endif
#endif

#ifdef S_ISBLK
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (S_ISBLK(st.st_mode)) return Qtrue;

#endif
    return Qfalse;
}

/*
* call-seq:
* File.chardev?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is a character device.
*/
static VALUE
rb_file_chardev_p(VALUE obj, SEL sel, VALUE fname)
{
#ifndef S_ISCHR
# define S_ISCHR(m) ((m & S_IFMT) == S_IFCHR)
#endif

    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (S_ISCHR(st.st_mode)) return Qtrue;

    return Qfalse;
}

/*
* call-seq:
* File.exist?(file_name) -> true or false
* File.exists?(file_name) -> true or false
*
* Return <code>true</code> if the named file exists.
*/

static VALUE
rb_file_exist_p(VALUE obj, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    return Qtrue;
}

/*
* call-seq:
* File.readable?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is readable by the effective
* user id of this process.
*/

static VALUE
rb_file_readable_p(VALUE obj, SEL sel, VALUE fname)
{
    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (eaccess(StringValueCStr(fname), R_OK) < 0) return Qfalse;
    return Qtrue;
}

/*
* call-seq:
* File.readable_real?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is readable by the real
* user id of this process.
*/

static VALUE
rb_file_readable_real_p(VALUE obj, SEL sel, VALUE fname)
{
    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (access_internal(StringValueCStr(fname), R_OK) < 0) return Qfalse;
    return Qtrue;
}

#ifndef S_IRUGO
# define S_IRUGO (S_IRUSR | S_IRGRP | S_IROTH)
#endif

#ifndef S_IWUGO
# define S_IWUGO (S_IWUSR | S_IWGRP | S_IWOTH)
#endif

/*
* call-seq:
* File.world_readable?(file_name) -> fixnum or nil
*
* If <i>file_name</i> is readable by others, returns an integer
* representing the file permission bits of <i>file_name</i>. Returns
* <code>nil</code> otherwise. The meaning of the bits is platform
* dependent; on Unix systems, see <code>stat(2)</code>.
*
* File.world_readable?("/etc/passwd") #=> 420
* m = File.world_readable?("/etc/passwd")
* sprintf("%o", m) #=> "644"
*/

static VALUE
rb_file_world_readable_p(VALUE obj, SEL sel, VALUE fname)
{
#ifdef S_IROTH
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qnil;
    if ((st.st_mode & (S_IROTH)) == S_IROTH) {
return UINT2NUM(st.st_mode & (S_IRUGO|S_IWUGO|S_IXUGO));
    }
#endif
    return Qnil;
}

/*
* call-seq:
* File.writable?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is writable by the effective
* user id of this process.
*/

static VALUE
rb_file_writable_p(VALUE obj, SEL sel, VALUE fname)
{
    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (eaccess(StringValueCStr(fname), W_OK) < 0) return Qfalse;
    return Qtrue;
}

/*
* call-seq:
* File.writable_real?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is writable by the real
* user id of this process.
*/

static VALUE
rb_file_writable_real_p(VALUE obj, SEL sel, VALUE fname)
{
    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (access_internal(StringValueCStr(fname), W_OK) < 0) return Qfalse;
    return Qtrue;
}

/*
* call-seq:
* File.world_writable?(file_name) -> fixnum or nil
*
* If <i>file_name</i> is writable by others, returns an integer
* representing the file permission bits of <i>file_name</i>. Returns
* <code>nil</code> otherwise. The meaning of the bits is platform
* dependent; on Unix systems, see <code>stat(2)</code>.
*
* File.world_writable?("/tmp") #=> 511
* m = File.world_writable?("/tmp")
* sprintf("%o", m) #=> "777"
*/

static VALUE
rb_file_world_writable_p(VALUE obj, SEL sel, VALUE fname)
{
#ifdef S_IWOTH
    struct stat st;

    if (rb_stat(fname, &st) < 0) {
return Qnil;
    }
    if ((st.st_mode & (S_IWOTH)) == S_IWOTH) {
return UINT2NUM(st.st_mode & (S_IRUGO | S_IWUGO | S_IXUGO));
    }
#endif
    return Qnil;
}

/*
* call-seq:
* File.executable?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is executable by the effective
* user id of this process.
*/

static VALUE
rb_file_executable_p(VALUE obj, SEL sel, VALUE fname)
{
    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (eaccess(StringValueCStr(fname), X_OK) < 0) return Qfalse;
    return Qtrue;
}

/*
* call-seq:
* File.executable_real?(file_name) -> true or false
*
* Returns <code>true</code> if the named file is executable by the real
* user id of this process.
*/

static VALUE
rb_file_executable_real_p(VALUE obj, SEL sel, VALUE fname)
{
    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (access_internal(StringValueCStr(fname), X_OK) < 0) return Qfalse;
    return Qtrue;
}

#ifndef S_ISREG
# define S_ISREG(m) ((m & S_IFMT) == S_IFREG)
#endif

/*
* call-seq:
* File.file?(file_name) -> true or false
*
* Returns <code>true</code> if the named file exists and is a
* regular file.
*/

static VALUE
rb_file_file_p(VALUE obj, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (S_ISREG(st.st_mode)) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* File.zero?(file_name) -> true or false
*
* Returns <code>true</code> if the named file exists and has
* a zero size.
*/

static VALUE
rb_file_zero_p(VALUE obj, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (st.st_size == 0) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* File.size?(file_name) -> Integer or nil
*
* Returns +nil+ if +file_name+ doesn't exist or has zero size, the size of the
* file otherwise.
*/

static VALUE
rb_file_size_p(VALUE obj, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qnil;
    if (st.st_size == 0) return Qnil;
    return OFFT2NUM(st.st_size);
}

/*
* call-seq:
* File.owned?(file_name) -> true or false
*
* Returns <code>true</code> if the named file exists and the
* effective used id of the calling process is the owner of
* the file.
*/

static VALUE
rb_file_owned_p(VALUE obj, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (st.st_uid == geteuid()) return Qtrue;
    return Qfalse;
}

static VALUE
rb_file_rowned_p(VALUE obj, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (st.st_uid == getuid()) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* File.grpowned?(file_name) -> true or false
*
* Returns <code>true</code> if the named file exists and the
* effective group id of the calling process is the owner of
* the file. Returns <code>false</code> on Windows.
*/

static VALUE
rb_file_grpowned_p(VALUE obj, SEL sel, VALUE fname)
{
#ifndef _WIN32
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qfalse;
    if (group_member(st.st_gid)) return Qtrue;
#endif
    return Qfalse;
}

#if defined(S_ISUID) || defined(S_ISGID) || defined(S_ISVTX)
static VALUE
check3rdbyte(VALUE fname, int mode)
{
    struct stat st;

    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (stat(StringValueCStr(fname), &st) < 0) return Qfalse;
    if (st.st_mode & mode) return Qtrue;
    return Qfalse;
}
#endif

/*
* call-seq:
* File.setuid?(file_name) -> true or false
*
* Returns <code>true</code> if the named file has the setuid bit set.
*/

static VALUE
rb_file_suid_p(VALUE obj, SEL sel, VALUE fname)
{
#ifdef S_ISUID
    return check3rdbyte(fname, S_ISUID);
#else
    return Qfalse;
#endif
}

/*
* call-seq:
* File.setgid?(file_name) -> true or false
*
* Returns <code>true</code> if the named file has the setgid bit set.
*/

static VALUE
rb_file_sgid_p(VALUE obj, SEL sel, VALUE fname)
{
#ifdef S_ISGID
    return check3rdbyte(fname, S_ISGID);
#else
    return Qfalse;
#endif
}

/*
* call-seq:
* File.sticky?(file_name) -> true or false
*
* Returns <code>true</code> if the named file has the sticky bit set.
*/

static VALUE
rb_file_sticky_p(VALUE obj, SEL sel, VALUE fname)
{
#ifdef S_ISVTX
    return check3rdbyte(fname, S_ISVTX);
#else
    return Qnil;
#endif
}

/*
* call-seq:
* File.identical?(file_1, file_2) -> true or false
*
* Returns <code>true</code> if the named files are identical.
*
* open("a", "w") {}
* p File.identical?("a", "a") #=> true
* p File.identical?("a", "./a") #=> true
* File.link("a", "b")
* p File.identical?("a", "b") #=> true
* File.symlink("a", "c")
* p File.identical?("a", "c") #=> true
* open("d", "w") {}
* p File.identical?("a", "d") #=> false
*/

static VALUE
rb_file_identical_p(VALUE obj, SEL sel, VALUE fname1, VALUE fname2)
{
    struct stat st1, st2;

    if (rb_stat(fname1, &st1) < 0) return Qfalse;
    if (rb_stat(fname2, &st2) < 0) return Qfalse;
    if (st1.st_dev != st2.st_dev) return Qfalse;
    if (st1.st_ino != st2.st_ino) return Qfalse;
    return Qtrue;
}

/*
* call-seq:
* File.size(file_name) -> integer
*
* Returns the size of <code>file_name</code>.
*/

static VALUE
rb_file_s_size(VALUE klass, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) {
FilePathValue(fname);
rb_sys_fail(RSTRING_PTR(fname));
    }
    return OFFT2NUM(st.st_size);
}

static VALUE
rb_file_ftype(const struct stat *st)
{
    const char *t;

    if (S_ISREG(st->st_mode)) {
t = "file";
    }
    else if (S_ISDIR(st->st_mode)) {
t = "directory";
    }
    else if (S_ISCHR(st->st_mode)) {
t = "characterSpecial";
    }
#ifdef S_ISBLK
    else if (S_ISBLK(st->st_mode)) {
t = "blockSpecial";
    }
#endif
#ifdef S_ISFIFO
    else if (S_ISFIFO(st->st_mode)) {
t = "fifo";
    }
#endif
#ifdef S_ISLNK
    else if (S_ISLNK(st->st_mode)) {
t = "link";
    }
#endif
#ifdef S_ISSOCK
    else if (S_ISSOCK(st->st_mode)) {
t = "socket";
    }
#endif
    else {
t = "unknown";
    }

    return rb_usascii_str_new2(t);
}

/*
* call-seq:
* File.ftype(file_name) -> string
*
* Identifies the type of the named file; the return string is one of
* ``<code>file</code>'', ``<code>directory</code>'',
* ``<code>characterSpecial</code>'', ``<code>blockSpecial</code>'',
* ``<code>fifo</code>'', ``<code>link</code>'',
* ``<code>socket</code>'', or ``<code>unknown</code>''.
*
* File.ftype("testfile") #=> "file"
* File.ftype("/dev/tty") #=> "characterSpecial"
* File.ftype("/tmp/.X11-unix/X0") #=> "socket"
*/

static VALUE
rb_file_s_ftype(VALUE klass, SEL sel, VALUE fname)
{
    struct stat st;

    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (lstat(StringValueCStr(fname), &st) == -1) {
rb_sys_fail(RSTRING_PTR(fname));
    }

    return rb_file_ftype(&st);
}

/*
* call-seq:
* File.atime(file_name) -> time
*
* Returns the last access time for the named file as a Time object).
*
* File.atime("testfile") #=> Wed Apr 09 08:51:48 CDT 2003
*
*/

static VALUE
rb_file_s_atime(VALUE klass, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) {
FilePathValue(fname);
rb_sys_fail(RSTRING_PTR(fname));
    }
    return stat_atime(&st);
}

/*
* call-seq:
* file.atime -> time
*
* Returns the last access time (a <code>Time</code> object)
* for <i>file</i>, or epoch if <i>file</i> has not been accessed.
*
* File.new("testfile").atime #=> Wed Dec 31 18:00:00 CST 1969
*
*/

static VALUE
rb_file_atime(VALUE obj, SEL sel)
{
    rb_io_t *io;
    struct stat st;

    GetOpenFile(obj, io);
    if (fstat(io->fd, &st) == -1) {
rb_sys_fail_path(io->path);
    }
    return stat_atime(&st);
}

/*
* call-seq:
* File.mtime(file_name) -> time
*
* Returns the modification time for the named file as a Time object.
*
* File.mtime("testfile") #=> Tue Apr 08 12:58:04 CDT 2003
*
*/

static VALUE
rb_file_s_mtime(VALUE klass, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) {
FilePathValue(fname);
rb_sys_fail(RSTRING_PTR(fname));
    }
    return stat_mtime(&st);
}

/*
* call-seq:
* file.mtime -> time
*
* Returns the modification time for <i>file</i>.
*
* File.new("testfile").mtime #=> Wed Apr 09 08:53:14 CDT 2003
*
*/

static VALUE
rb_file_mtime(VALUE obj, SEL sel)
{
    rb_io_t *io;
    struct stat st;

    GetOpenFile(obj, io);
    if (fstat(io->fd, &st) == -1) {
rb_sys_fail_path(io->path);
    }
    return stat_mtime(&st);
}

/*
* call-seq:
* File.ctime(file_name) -> time
*
* Returns the change time for the named file (the time at which
* directory information about the file was changed, not the file
* itself).
*
* File.ctime("testfile") #=> Wed Apr 09 08:53:13 CDT 2003
*
*/

static VALUE
rb_file_s_ctime(VALUE klass, SEL sel, VALUE fname)
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) {
FilePathValue(fname);
rb_sys_fail(RSTRING_PTR(fname));
    }
    return stat_ctime(&st);
}

/*
* call-seq:
* file.ctime -> time
*
* Returns the change time for <i>file</i> (that is, the time directory
* information about the file was changed, not the file itself).
*
* File.new("testfile").ctime #=> Wed Apr 09 08:53:14 CDT 2003
*
*/

static VALUE
rb_file_ctime(VALUE obj, SEL sel)
{
    rb_io_t *io;
    struct stat st;

    GetOpenFile(obj, io);
    if (fstat(io->fd, &st) == -1) {
rb_sys_fail_path(io->path);
    }
    return stat_ctime(&st);
}

/*
* call-seq:
* file.size -> integer
*
* Returns the size of <i>file</i> in bytes.
*
* File.new("testfile").size #=> 66
*
*/

static VALUE
rb_file_size(VALUE obj, SEL sel)
{
    rb_io_t *io;
    struct stat st;

    GetOpenFile(obj, io);
    if (fstat(io->fd, &st) == -1) {
rb_sys_fail_path(io->path);
    }
    return OFFT2NUM(st.st_size);
}

static void
chmod_internal(const char *path, void *mode)
{
    if (chmod(path, *(int *)mode) < 0)
rb_sys_fail(path);
}

/*
* call-seq:
* File.chmod(mode_int, file_name, ... ) -> integer
*
* Changes permission bits on the named file(s) to the bit pattern
* represented by <i>mode_int</i>. Actual effects are operating system
* dependent (see the beginning of this section). On Unix systems, see
* <code>chmod(2)</code> for details. Returns the number of files
* processed.
*
* File.chmod(0644, "testfile", "out") #=> 2
*/

static VALUE
rb_file_s_chmod(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    rb_secure(2);
    if (argc < 1) {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
    }
    int mode = NUM2INT(argv[0]);

    long n = apply2files(chmod_internal, argc - 1, &argv[1], &mode);
    return LONG2FIX(n);
}

/*
* call-seq:
* file.chmod(mode_int) -> 0
*
* Changes permission bits on <i>file</i> to the bit pattern
* represented by <i>mode_int</i>. Actual effects are platform
* dependent; on Unix systems, see <code>chmod(2)</code> for details.
* Follows symbolic links. Also see <code>File#lchmod</code>.
*
* f = File.new("out", "w");
* f.chmod(0644) #=> 0
*/

static VALUE
rb_file_chmod(VALUE obj, SEL sel, VALUE vmode)
{
    rb_io_t *io;

    rb_secure(2);
    int mode = NUM2INT(vmode);

    GetOpenFile(obj, io);
    if (fchmod(io->fd, mode) == -1) {
rb_sys_fail(RSTRING_PTR(io->path));
    }
    return INT2FIX(0);
}

#if defined(HAVE_LCHMOD)
static void
lchmod_internal(const char *path, void *mode)
{
    if (lchmod(path, (int)(VALUE)mode) < 0)
rb_sys_fail(path);
}

/*
* call-seq:
* File.lchmod(mode_int, file_name, ...) -> integer
*
* Equivalent to <code>File::chmod</code>, but does not follow symbolic
* links (so it will change the permissions associated with the link,
* not the file referenced by the link). Often not available.
*
*/

static VALUE
rb_file_s_lchmod(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    rb_secure(2);
    if (argc < 1) {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
    }
    VALUE vmode = argv[0];
    int mode = NUM2INT(vmode);

    long n = apply2files(lchmod_internal, argc - 1, &argv[1],
(void *)(long)mode);
    return LONG2FIX(n);
}
#else
# define rb_file_s_lchmod rb_f_notimplement
#endif

struct chown_args {
    rb_uid_t owner;
    rb_gid_t group;
};

static void
chown_internal(const char *path, void *arg)
{
    struct chown_args *args = arg;
    if (chown(path, args->owner, args->group) < 0)
rb_sys_fail(path);
}

/*
* call-seq:
* File.chown(owner_int, group_int, file_name,... ) -> integer
*
* Changes the owner and group of the named file(s) to the given
* numeric owner and group id's. Only a process with superuser
* privileges may change the owner of a file. The current owner of a
* file may change the file's group to any group to which the owner
* belongs. A <code>nil</code> or -1 owner or group id is ignored.
* Returns the number of files processed.
*
* File.chown(nil, 100, "testfile")
*
*/

static VALUE
rb_file_s_chown(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    rb_secure(2);
    if (argc < 2) {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2)", argc);
    }
    VALUE o = argv[0];
    VALUE g = argv[1];
    struct chown_args arg;
    if (NIL_P(o)) {
arg.owner = -1;
    }
    else {
arg.owner = NUM2UIDT(o);
    }
    if (NIL_P(g)) {
arg.group = -1;
    }
    else {
arg.group = NUM2GIDT(g);
    }

    long n = apply2files(chown_internal, argc - 2, &argv[2], &arg);
    return LONG2FIX(n);
}

/*
* call-seq:
* file.chown(owner_int, group_int ) -> 0
*
* Changes the owner and group of <i>file</i> to the given numeric
* owner and group id's. Only a process with superuser privileges may
* change the owner of a file. The current owner of a file may change
* the file's group to any group to which the owner belongs. A
* <code>nil</code> or -1 owner or group id is ignored. Follows
* symbolic links. See also <code>File#lchown</code>.
*
* File.new("testfile").chown(502, 1000)
*
*/

static VALUE
rb_file_chown(VALUE obj, SEL sel, VALUE owner, VALUE group)
{
    rb_io_t *io;

    rb_secure(2);

    const int o = NIL_P(owner) ? -1 : NUM2INT(owner);
    const int g = NIL_P(group) ? -1 : NUM2INT(group);
    GetOpenFile(obj, io);

    if (fchown(io->fd, o, g) == -1) {
rb_sys_fail_path(io->path);
    }

    return INT2FIX(0);
}

#if defined(HAVE_LCHOWN) && !defined(__CHECKER__)
static void
lchown_internal(const char *path, void *arg)
{
    struct chown_args *args = arg;
    if (lchown(path, args->owner, args->group) < 0)
rb_sys_fail(path);
}

/*
* call-seq:
* file.lchown(owner_int, group_int, file_name,..) -> integer
*
* Equivalent to <code>File::chown</code>, but does not follow symbolic
* links (so it will change the owner associated with the link, not the
* file referenced by the link). Often not available. Returns number
* of files in the argument list.
*
*/

static VALUE
rb_file_s_lchown(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    rb_secure(2);
    if (argc < 2) {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2)", argc);
    }
    VALUE o = argv[0];
    VALUE g = argv[1];
    struct chown_args arg;
    if (NIL_P(o)) {
arg.owner = -1;
    }
    else {
arg.owner = NUM2UIDT(o);
    }
    if (NIL_P(g)) {
arg.group = -1;
    }
    else {
arg.group = NUM2GIDT(g);
    }

    long n = apply2files(lchown_internal, argc - 2, &argv[2], &arg);
    return LONG2FIX(n);
}
#else
# define rb_file_s_lchown rb_f_notimplement
#endif

struct timespec rb_time_timespec(VALUE time);

#if defined(HAVE_UTIMES)

static void
utime_internal(const char *path, void *arg)
{
    struct timespec *tsp = arg;
    struct timeval tvbuf[2], *tvp = arg;

#ifdef HAVE_UTIMENSAT
    static int try_utimensat = 1;

    if (try_utimensat) {
        struct timespec *tsp = arg;
        if (utimensat(AT_FDCWD, path, tsp, 0) < 0) {
            if (errno == ENOSYS) {
                try_utimensat = 0;
                goto no_utimensat;
            }
            rb_sys_fail(path);
        }
        return;
    }
no_utimensat:
#endif

    if (tsp) {
        tvbuf[0].tv_sec = tsp[0].tv_sec;
        tvbuf[0].tv_usec = (int)(tsp[0].tv_nsec / 1000);
        tvbuf[1].tv_sec = tsp[1].tv_sec;
        tvbuf[1].tv_usec = (int)(tsp[1].tv_nsec / 1000);
        tvp = tvbuf;
    }
    if (utimes(path, tvp) < 0)
rb_sys_fail(path);
}

#else

#if !defined HAVE_UTIME_H && !defined HAVE_SYS_UTIME_H
struct utimbuf {
    long actime;
    long modtime;
};
#endif

static void
utime_internal(const char *path, void *arg)
{
    struct timespec *tsp = arg;
    struct utimbuf utbuf, *utp = NULL;
    if (tsp) {
        utbuf.actime = tsp[0].tv_sec;
        utbuf.modtime = tsp[1].tv_sec;
        utp = &utbuf;
    }
    if (utime(path, utp) < 0)
rb_sys_fail(path);
}

#endif

/*
* call-seq:
* File.utime(atime, mtime, file_name,...) -> integer
*
* Sets the access and modification times of each
* named file to the first two arguments. Returns
* the number of file names in the argument list.
*/

static VALUE
rb_file_s_utime(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    rb_secure(2);
    if (argc < 2) {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2)", argc);
    }
    VALUE atime = argv[0];
    VALUE mtime = argv[1];

    struct timespec tss[2], *tsp = NULL;
    if (!NIL_P(atime) || !NIL_P(mtime)) {
tsp = tss;
tsp[0] = rb_time_timespec(atime);
tsp[1] = rb_time_timespec(mtime);
    }

    long n = apply2files(utime_internal, argc - 2, &argv[2], tsp);
    return LONG2FIX(n);
}

NORETURN(static void sys_fail2(VALUE,VALUE));
static void
sys_fail2(VALUE s1, VALUE s2)
{
    char *buf;
#ifdef MAX_PATH
    const int max_pathlen = MAX_PATH;
#else
    const int max_pathlen = MAXPATHLEN;
#endif
    const char *e1, *e2;
    int len = 5;
    long l1 = RSTRING_LEN(s1), l2 = RSTRING_LEN(s2);

    e1 = e2 = "";
    if (l1 > max_pathlen) {
l1 = max_pathlen - 3;
e1 = "...";
len += 3;
    }
    if (l2 > max_pathlen) {
l2 = max_pathlen - 3;
e2 = "...";
len += 3;
    }
    len += (int)l1 + (int)l2;
    buf = ALLOCA_N(char, len);
    snprintf(buf, len, "(%.*s%s, %.*s%s)",
(int)l1, RSTRING_PTR(s1), e1,
(int)l2, RSTRING_PTR(s2), e2);
    rb_sys_fail(buf);
}

/*
* call-seq:
* File.link(old_name, new_name) -> 0
*
* Creates a new name for an existing file using a hard link. Will not
* overwrite <i>new_name</i> if it already exists (raising a subclass
* of <code>SystemCallError</code>). Not available on all platforms.
*
* File.link("testfile", ".testfile") #=> 0
* IO.readlines(".testfile")[0] #=> "This is line one\n"
*/

#ifdef HAVE_LINK
static VALUE
rb_file_s_link(VALUE klass, SEL sel, VALUE from, VALUE to)
{
    rb_secure(2);
    FilePathValue(from);
    FilePathValue(to);
    from = rb_str_encode_ospath(from);
    to = rb_str_encode_ospath(to);

    if (link(StringValueCStr(from), StringValueCStr(to)) < 0) {
sys_fail2(from, to);
    }
    return INT2FIX(0);
}
#else
# define rb_file_s_link rb_f_notimplement
#endif

/*
* call-seq:
* File.symlink(old_name, new_name) -> 0
*
* Creates a symbolic link called <i>new_name</i> for the existing file
* <i>old_name</i>. Raises a <code>NotImplemented</code> exception on
* platforms that do not support symbolic links.
*
* File.symlink("testfile", "link2test") #=> 0
*
*/

#ifdef HAVE_SYMLINK
static VALUE
rb_file_s_symlink(VALUE klass, SEL sel, VALUE from, VALUE to)
{
    rb_secure(2);
    FilePathValue(from);
    FilePathValue(to);
    from = rb_str_encode_ospath(from);
    to = rb_str_encode_ospath(to);

    if (symlink(StringValueCStr(from), StringValueCStr(to)) < 0) {
sys_fail2(from, to);
    }
    return INT2FIX(0);
}
#else
# define rb_file_s_symlink rb_f_notimplement
#endif

/*
* call-seq:
* File.readlink(link_name) -> file_name
*
* Returns the name of the file referenced by the given link.
* Not available on all platforms.
*
* File.symlink("testfile", "link2test") #=> 0
* File.readlink("link2test") #=> "testfile"
*/

#ifdef HAVE_READLINK
static VALUE
rb_file_s_readlink(VALUE klass, SEL sel, VALUE path)
{
    char *buf;
    int size = 100;
    int rv;
    VALUE v;

    rb_secure(2);
    FilePathValue(path);
    path = rb_str_encode_ospath(path);
    buf = xmalloc(size);
    while ((rv = readlink(RSTRING_PTR(path), buf, size)) == size
#ifdef _AIX
|| (rv < 0 && errno == ERANGE) /* quirky behavior of GPFS */
#endif
) {
size *= 2;
buf = xrealloc(buf, size);
    }
    if (rv < 0) {
xfree(buf);
rb_sys_fail_path(path);
    }
    v = rb_tainted_str_new(buf, rv);
    xfree(buf);

    return v;
}
#else
# define rb_file_s_readlink rb_f_notimplement
#endif

static void
unlink_internal(const char *path, void *arg)
{
    if (unlink(path) < 0)
rb_sys_fail(path);
}

/*
* call-seq:
* File.delete(file_name, ...) -> integer
* File.unlink(file_name, ...) -> integer
*
* Deletes the named files, returning the number of names
* passed as arguments. Raises an exception on any error.
* See also <code>Dir::rmdir</code>.
*/

static VALUE
rb_file_s_unlink(VALUE klass, SEL sel, int argc, VALUE *argv)
{
    long n;

    rb_secure(2);
    n = apply2files(unlink_internal, argc, argv, 0);
    return LONG2FIX(n);
}

/*
* call-seq:
* File.rename(old_name, new_name) -> 0
*
* Renames the given file to the new name. Raises a
* <code>SystemCallError</code> if the file cannot be renamed.
*
* File.rename("afile", "afile.bak") #=> 0
*/

static VALUE
rb_file_s_rename(VALUE klass, SEL sel, VALUE from, VALUE to)
{
    const char *src, *dst;
    VALUE f, t;

    rb_secure(2);
    FilePathValue(from);
    FilePathValue(to);
    f = rb_str_encode_ospath(from);
    t = rb_str_encode_ospath(to);
    src = StringValueCStr(f);
    dst = StringValueCStr(t);
    if (rename(src, dst) < 0) {
sys_fail2(from, to);
    }

    return INT2FIX(0);
}

/*
* call-seq:
* File.umask() -> integer
* File.umask(integer) -> integer
*
* Returns the current umask value for this process. If the optional
* argument is given, set the umask to that value and return the
* previous value. Umask values are <em>subtracted</em> from the
* default permissions, so a umask of <code>0222</code> would make a
* file read-only for everyone.
*
* File.umask(0006) #=> 18
* File.umask #=> 6
*/

static VALUE
rb_file_s_umask(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    int omask = 0;

    rb_secure(2);
    if (argc == 0) {
omask = umask(0);
umask(omask);
    }
    else if (argc == 1) {
omask = umask(NUM2INT(argv[0]));
    }
    else {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0..1)", argc);
    }
    return INT2FIX(omask);
}

#ifdef __CYGWIN__
#undef DOSISH
#endif
#if defined __CYGWIN__ || defined DOSISH
#define DOSISH_UNC
#define DOSISH_DRIVE_LETTER
#define isdirsep(x) ((x) == '/' || (x) == '\\')
#else
#define isdirsep(x) ((x) == '/')
#endif

#ifndef CharNext /* defined as CharNext[AW] on Windows. */
# if defined(DJGPP)
# define CharNext(p) ((p) + mblen(p, RUBY_MBCHAR_MAXSIZE))
# else
# define CharNext(p) ((p) + 1)
# endif
#endif

#define istrailinggabage(x) 0

#ifndef CharNext
# define CharNext(p) ((p) + 1)
#endif

static inline char *
skiproot(const char *path)
{
    while (isdirsep(*path)) path++;
    return (char *)path;
}

#define nextdirsep rb_path_next
char *
rb_path_next(const char *s)
{
    while (*s && !isdirsep(*s)) {
s = CharNext(s);
    }
    return (char *)s;
}

#define skipprefix(path) (path)

#define strrdirsep rb_path_last_separator
static char *
rb_path_last_separator(const char *path)
{
    char *last = NULL;
    while (*path) {
if (isdirsep(*path)) {
const char *tmp = path++;
while (isdirsep(*path)) path++;
if (!*path) break;
last = (char *)tmp;
}
else {
path = CharNext(path);
}
    }
    return last;
}

static char *
chompdirsep(const char *path)
{
    while (*path) {
if (isdirsep(*path)) {
const char *last = path++;
while (isdirsep(*path)) path++;
if (!*path) return (char *)last;
}
else {
path = CharNext(path);
}
    }
    return (char *)path;
}

char *
rb_path_end(const char *path)
{
    if (isdirsep(*path)) path++;
    return chompdirsep(path);
}

/*
* call-seq:
* File.expand_path(file_name [, dir_string] ) -> abs_file_name
*
* Converts a pathname to an absolute pathname. Relative paths are
* referenced from the current working directory of the process unless
* <i>dir_string</i> is given, in which case it will be used as the
* starting point. The given pathname may start with a
* ``<code>~</code>'', which expands to the process owner's home
* directory (the environment variable <code>HOME</code> must be set
* correctly). ``<code>~</code><i>user</i>'' expands to the named
* user's home directory.
*
* File.expand_path("~oracle/bin") #=> "/home/oracle/bin"
* File.expand_path("../../bin", "/tmp/x") #=> "/bin"
*/

static VALUE
rb_file_s_expand_path(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    VALUE fname, dname;

    if (argc == 1) {
return rb_file_expand_path(argv[0], Qnil);
    }
    rb_scan_args(argc, argv, "11", &fname, &dname);

    return rb_file_expand_path(fname, dname);
}

/*
* call-seq:
* File.absolute_path(file_name [, dir_string] ) -> abs_file_name
*
* Converts a pathname to an absolute pathname. Relative paths are
* referenced from the current working directory of the process unless
* <i>dir_string</i> is given, in which case it will be used as the
* starting point. If the given pathname starts with a ``<code>~</code>''
* it is NOT expanded, it is treated as a normal directory name.
*
* File.absolute_path("~oracle/bin") #=> "<relative_path>/~oracle/bin"
*/

VALUE
rb_file_s_absolute_path(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    VALUE fname, dname;

    if (argc == 1) {
return rb_file_absolute_path(argv[0], Qnil);
    }
    rb_scan_args(argc, argv, "11", &fname, &dname);

    return rb_file_absolute_path(fname, dname);
}

static void
realpath_rec(long *prefixlenp, VALUE *resolvedp, char *unresolved, VALUE loopcheck, int strict, int last)
{
    ID resolving = rb_intern("resolving");
    while (*unresolved) {
        char *testname = unresolved;
        char *unresolved_firstsep = rb_path_next(unresolved);
        long testnamelen = unresolved_firstsep - unresolved;
        char *unresolved_nextname = unresolved_firstsep;
        while (isdirsep(*unresolved_nextname)) unresolved_nextname++;
        unresolved = unresolved_nextname;
        if (testnamelen == 1 && testname[0] == '.') {
        }
        else if (testnamelen == 2 && testname[0] == '.' && testname[1] == '.') {
            if (*prefixlenp < RSTRING_LEN(*resolvedp)) {
                char *resolved_names = RSTRING_PTR(*resolvedp) + *prefixlenp;
                char *lastsep = rb_path_last_separator(resolved_names);
                long len = lastsep ? lastsep - resolved_names : 0;
                rb_str_set_len(*resolvedp, *prefixlenp + len);
            }
        }
        else {
            VALUE checkval;
            VALUE testpath = rb_str_dup(*resolvedp);
            if (*prefixlenp < RSTRING_LEN(testpath))
                rb_str_cat2(testpath, "/");
            rb_str_cat(testpath, testname, testnamelen);
            checkval = rb_hash_aref(loopcheck, testpath);
            if (!NIL_P(checkval)) {
                if (checkval == ID2SYM(resolving)) {
                    errno = ELOOP;
                    rb_sys_fail(RSTRING_PTR(testpath));
                }
                else {
                    *resolvedp = rb_str_dup(checkval);
                }
            }
            else {
                struct stat sbuf;
                int ret;
                VALUE testpath2 = rb_str_encode_ospath(testpath);
                ret = lstat(RSTRING_PTR(testpath2), &sbuf);
                if (ret == -1) {
                    if (errno == ENOENT) {
                        if (strict || !last || *unresolved_firstsep)
                            rb_sys_fail(RSTRING_PTR(testpath));
                        *resolvedp = testpath;
                        break;
                    }
                    else {
                        rb_sys_fail(RSTRING_PTR(testpath));
                    }
                }
#ifdef HAVE_READLINK
                if (S_ISLNK(sbuf.st_mode)) {
                    volatile VALUE link;
                    char *link_prefix, *link_names;
                    long link_prefixlen;
                    rb_hash_aset(loopcheck, testpath, ID2SYM(resolving));
                    link = rb_file_s_readlink(rb_cFile, 0, testpath);
                    link_prefix = RSTRING_PTR(link);
                    link_names = skiproot(link_prefix);
                    link_prefixlen = link_names - link_prefix;
                    if (link_prefixlen == 0) {
                        realpath_rec(prefixlenp, resolvedp, link_names, loopcheck, strict, *unresolved_firstsep == '\0');
                    }
                    else {
                        *resolvedp = rb_str_new(link_prefix, link_prefixlen);
                        *prefixlenp = link_prefixlen;
                        realpath_rec(prefixlenp, resolvedp, link_names, loopcheck, strict, *unresolved_firstsep == '\0');
                    }
                    rb_hash_aset(loopcheck, testpath, rb_str_dup_frozen(*resolvedp));
                }
                else
#endif
                {
                    VALUE s = rb_str_dup_frozen(testpath);
                    rb_hash_aset(loopcheck, s, s);
                    *resolvedp = testpath;
                }
            }
        }
    }
}

VALUE
rb_realpath_internal(VALUE basedir, VALUE path, int strict)
{
    long prefixlen;
    VALUE resolved;
    volatile VALUE unresolved_path;
    VALUE loopcheck;
    volatile VALUE curdir = Qnil;

    char *path_names = NULL, *basedir_names = NULL, *curdir_names = NULL;
    char *ptr, *prefixptr = NULL;

    rb_secure(2);

    FilePathValue(path);
    unresolved_path = rb_str_dup_frozen(path);

    if (!NIL_P(basedir)) {
        FilePathValue(basedir);
        basedir = rb_str_dup_frozen(basedir);
    }

    ptr = RSTRING_PTR(unresolved_path);
    path_names = skiproot(ptr);
    if (ptr != path_names) {
        resolved = rb_str_new(ptr, path_names - ptr);
        goto root_found;
    }

    if (!NIL_P(basedir)) {
        ptr = RSTRING_PTR(basedir);
        basedir_names = skiproot(ptr);
        if (ptr != basedir_names) {
            resolved = rb_str_new(ptr, basedir_names - ptr);
            goto root_found;
        }
    }

    curdir = ruby_getcwd();
    ptr = RSTRING_PTR(curdir);
    curdir_names = skiproot(ptr);
    resolved = rb_str_new(ptr, curdir_names - ptr);

  root_found:
    prefixptr = RSTRING_PTR(resolved);
    prefixlen = RSTRING_LEN(resolved);
    ptr = chompdirsep(prefixptr);
    if (*ptr) {
        prefixlen = ++ptr - prefixptr;
        rb_str_set_len(resolved, prefixlen);
    }
#ifdef FILE_ALT_SEPARATOR
    while (prefixptr < ptr) {
if (*prefixptr == FILE_ALT_SEPARATOR) {
*prefixptr = '/';
}
prefixptr = CharNext(prefixptr);
    }
#endif

    loopcheck = rb_hash_new();
    if (curdir_names)
        realpath_rec(&prefixlen, &resolved, curdir_names, loopcheck, 1, 0);
    if (basedir_names)
        realpath_rec(&prefixlen, &resolved, basedir_names, loopcheck, 1, 0);
    realpath_rec(&prefixlen, &resolved, path_names, loopcheck, strict, 1);

    OBJ_TAINT(resolved);
    return resolved;
}

/*
* call-seq:
* File.realpath(pathname [, dir_string]) -> real_pathname
*
* Returns the real (absolute) pathname of _pathname_ in the actual
* filesystem not containing symlinks or useless dots.
*
* If _dir_string_ is given, it is used as a base directory
* for interpreting relative pathname instead of the current directory.
*
* All components of the pathname must exist when this method is
* called.
*/
static VALUE
rb_file_s_realpath(VALUE klass, SEL sel, int argc, VALUE *argv)
{
    VALUE path, basedir;
    rb_scan_args(argc, argv, "11", &path, &basedir);
    return rb_realpath_internal(basedir, path, 1);
}

/*
* call-seq:
* File.realdirpath(pathname [, dir_string]) -> real_pathname
*
* Returns the real (absolute) pathname of _pathname_ in the actual filesystem.
* The real pathname doesn't contain symlinks or useless dots.
*
* If _dir_string_ is given, it is used as a base directory
* for interpreting relative pathname instead of the current directory.
*
* The last component of the real pathname can be nonexistent.
*/
static VALUE
rb_file_s_realdirpath(VALUE klass, SEL sel, int argc, VALUE *argv)
{
    VALUE path, basedir;
    rb_scan_args(argc, argv, "11", &path, &basedir);
    return rb_realpath_internal(basedir, path, 0);
}

static size_t
rmext(const char *p, long l1, const char *e)
{
    long l0, l2;

    if (!e) return 0;

    for (l0 = 0; l0 < l1; ++l0) {
if (p[l0] != '.') break;
    }
    l2 = strlen(e);
    if (l2 == 2 && e[1] == '*') {
unsigned char c = *e;
e = p + l1;
do {
if (e <= p + l0) return 0;
} while (*--e != c);
return e - p;
    }
    if (l1 < l2) return l1;

#if CASEFOLD_FILESYSTEM
#define fncomp strncasecmp
#else
#define fncomp strncmp
#endif
    if (fncomp(p+l1-l2, e, l2) == 0) {
return l1-l2;
    }
    return 0;
}

/*
* call-seq:
* File.basename(file_name [, suffix] ) -> base_name
*
* Returns the last component of the filename given in <i>file_name</i>,
* which must be formed using forward slashes (``<code>/</code>'')
* regardless of the separator used on the local file system. If
* <i>suffix</i> is given and present at the end of <i>file_name</i>,
* it is removed.
*
* File.basename("/home/gumby/work/ruby.rb") #=> "ruby.rb"
* File.basename("/home/gumby/work/ruby.rb", ".rb") #=> "ruby"
*/

static VALUE
rb_file_s_basename(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    VALUE fname, fext, basename;
    const char *name, *p;
    long f, n;

    if (rb_scan_args(argc, argv, "11", &fname, &fext) == 2) {
StringValue(fext);
    }
    FilePathStringValue(fname);
    if (RSTRING_LEN(fname) == 0 || !*(name = RSTRING_PTR(fname))) {
return rb_str_new3(fname);
    }
    name = skipprefix(name);
    while (isdirsep(*name))
name++;
    if (!*name) {
p = name - 1;
f = 1;
    }
    else {
if (!(p = strrdirsep(name))) {
p = name;
}
else {
while (isdirsep(*p)) p++; /* skip last / */
}
n = chompdirsep(p) - p;
if (NIL_P(fext) || !(f = rmext(p, n, StringValueCStr(fext)))) {
f = n;
}
if (f == RSTRING_LEN(fname)) return rb_str_new3(fname);
    }

    basename = rb_str_new(p, f);
    rb_enc_copy(basename, fname);
    OBJ_INFECT(basename, fname);
    return basename;
}

/*
* call-seq:
* File.dirname(file_name ) -> dir_name
*
* Returns all components of the filename given in <i>file_name</i>
* except the last one. The filename must be formed using forward
* slashes (``<code>/</code>'') regardless of the separator used on the
* local file system.
*
* File.dirname("/home/gumby/work/ruby.rb") #=> "/home/gumby/work"
*/

static VALUE
rb_file_s_dirname(VALUE klass, SEL sel, VALUE fname)
{
    return rb_file_dirname(fname);
}

VALUE
rb_file_dirname(VALUE fname)
{
    const char *name, *root, *p;
    VALUE dirname;

    FilePathStringValue(fname);
    name = StringValueCStr(fname);
    root = skiproot(name);
    if (root > name + 1) {
name = root - 1;
    }
    p = strrdirsep(root);
    if (!p) {
p = root;
    }
    if (p == name)
return rb_usascii_str_new2(".");
    dirname = rb_str_new(name, p - name);
    rb_enc_copy(dirname, fname);
    OBJ_INFECT(dirname, fname);
    return dirname;
}

/*
* accept a String, and return the pointer of the extension.
* if len is passed, set the length of extension to it.
* returned pointer is in ``name'' or NULL.
* returns *len
* no dot NULL 0
* dotfile top 0
* end with dot dot 1
* .ext dot len of .ext
* .ext:stream dot len of .ext without :stream (NT only)
*
*/
const char *
ruby_find_extname(const char *name, long *len)
{
    const char *p, *e;

    p = strrdirsep(name); /* get the last path component */
    if (!p) {
p = name;
    }
    else {
do {
name = ++p;
} while (isdirsep(*p));
    }

    e = 0;
    while (*p && *p == '.') { p++; }
    while (*p) {
if (*p == '.') {
e = p; /* get the last dot of the last component */
}
else if (isdirsep(*p)) {
break;
}
p = CharNext(p);
    }

    if (len) {
/* no dot, or the only dot is first or end? */
if (!e || e == name) {
*len = 0;
}
else if (e+1 == p) {
*len = 1;
}
else {
*len = p - e;
}
    }
    return e;
}

/*
* call-seq:
* File.extname(path) -> string
*
* Returns the extension (the portion of file name in <i>path</i>
* after the period).
*
* File.extname("test.rb") #=> ".rb"
* File.extname("a/b/d/test.rb") #=> ".rb"
* File.extname("test") #=> ""
* File.extname(".profile") #=> ""
*
*/

static VALUE
rb_file_s_extname(VALUE klass, SEL sel, VALUE fname)
{
    const char *name, *e;
    long len;
    VALUE extname;

    FilePathStringValue(fname);
    name = StringValueCStr(fname);
    e = ruby_find_extname(name, &len);
    if (len <= 1) {
return rb_str_new(0, 0);
    }
    extname = rb_str_new(e, len); /* keep the dot, too! */
    rb_enc_copy(extname, fname);
    OBJ_INFECT(extname, fname);
    return extname;
}

/*
* call-seq:
* File.path(path) -> string
*
* Returns the string representation of the path
*
* File.path("/dev/null") #=> "/dev/null"
* File.path(Pathname.new("/tmp")) #=> "/tmp"
*
*/

static VALUE
rb_file_s_path(VALUE klass, SEL sel, VALUE fname)
{
    return rb_get_path(fname);
}

/*
* call-seq:
* File.split(file_name) -> array
*
* Splits the given string into a directory and a file component and
* returns them in a two-element array. See also
* <code>File::dirname</code> and <code>File::basename</code>.
*
* File.split("/home/gumby/.profile") #=> ["/home/gumby", ".profile"]
*/

static VALUE
rb_file_s_split(VALUE klass, SEL sel, VALUE path)
{
    FilePathStringValue(path); /* get rid of converting twice */
    return rb_assoc_new(rb_file_s_dirname(Qnil, 0, path),
rb_file_s_basename(0,0,1,&path));
}

static VALUE separator;

static VALUE
rb_file_join(VALUE ary, VALUE sep)
{
    assert(rb_str_chars_len(sep) == 1);
    UChar sep_char = rb_str_get_uchar(sep, 0);
    VALUE res = rb_str_new(NULL, 0);
    OBJ_INFECT(res, ary);
    for (long i = 0, count = RARRAY_LEN(ary); i < count; i++) {
VALUE tmp = RARRAY_AT(ary, i);
switch (TYPE(tmp)) {
case T_STRING:
break;

case T_ARRAY:
if (ary == tmp) {
rb_raise(rb_eArgError, "recursive array");
}
tmp = rb_file_join(tmp, sep);
break;

default:
FilePathStringValue(tmp);
}

#define uchar_at_is_sep(str, pos) (rb_str_get_uchar(str, pos) == sep_char)
if (i > 0 && !NIL_P(sep)) {
const long res_len = rb_str_chars_len(res);
const long tmp_len = rb_str_chars_len(tmp);

if (res_len > 0 && uchar_at_is_sep(res, res_len - 1)) {
if (tmp_len > 0 && uchar_at_is_sep(tmp, 0)) {
long nb_sep_char = 1;
while (nb_sep_char < res_len
&& uchar_at_is_sep(res, res_len - nb_sep_char - 1)) {
nb_sep_char++;
}
rb_str_delete(res, res_len - nb_sep_char, nb_sep_char);
}
}
else if (tmp_len == 0
|| rb_str_get_uchar(tmp, 0) != sep_char) {
rb_str_concat(res, sep);
}
}
rb_str_concat(res, tmp);
#undef uchar_at_is_sep
    }
    return res;
}

/*
* call-seq:
* File.join(string, ...) -> path
*
* Returns a new string formed by joining the strings using
* <code>File::SEPARATOR</code>.
*
* File.join("usr", "mail", "gumby") #=> "usr/mail/gumby"
*
*/

static VALUE
rb_file_s_join(VALUE klass, SEL sel, VALUE args)
{
    return rb_file_join(args, separator);
}

/*
* call-seq:
* File.truncate(file_name, integer) -> 0
*
* Truncates the file <i>file_name</i> to be at most <i>integer</i>
* bytes long. Not available on all platforms.
*
* f = File.new("out", "w")
* f.write("1234567890") #=> 10
* f.close #=> nil
* File.truncate("out", 5) #=> 0
* File.size("out") #=> 5
*
*/

static VALUE
rb_file_s_truncate(VALUE klass, SEL sel, VALUE path, VALUE len)
{
    rb_secure(2);
    const off_t pos = NUM2OFFT(len);
    FilePathValue(path);
    path = rb_str_encode_ospath(path);
    if (truncate(StringValueCStr(path), pos) < 0) {
rb_sys_fail(RSTRING_PTR(path));
    }
    return INT2FIX(0);
}

/*
* call-seq:
* file.truncate(integer) -> 0
*
* Truncates <i>file</i> to at most <i>integer</i> bytes. The file
* must be opened for writing. Not available on all platforms.
*
* f = File.new("out", "w")
* f.syswrite("1234567890") #=> 10
* f.truncate(5) #=> 0
* f.close() #=> nil
* File.size("out") #=> 5
*/

static VALUE
rb_file_truncate(VALUE obj, SEL sel, VALUE len)
{
    rb_io_t *io;

    rb_secure(2);
    const off_t pos = NUM2OFFT(len);
    GetOpenFile(obj, io);
    rb_io_assert_writable(io);
    if (ftruncate(io->fd, pos) < 0) {
rb_sys_fail_path(io->path);
    }
    return INT2FIX(0);
}

# ifndef LOCK_SH
# define LOCK_SH 1
# endif
# ifndef LOCK_EX
# define LOCK_EX 2
# endif
# ifndef LOCK_NB
# define LOCK_NB 4
# endif
# ifndef LOCK_UN
# define LOCK_UN 8
# endif

#ifdef __CYGWIN__
#include <winerror.h>
extern unsigned long __attribute__((stdcall)) GetLastError(void);
#endif

/*
* call-seq:
* file.flock (locking_constant )-> 0 or false
*
* Locks or unlocks a file according to <i>locking_constant</i> (a
* logical <em>or</em> of the values in the table below).
* Returns <code>false</code> if <code>File::LOCK_NB</code> is
* specified and the operation would otherwise have blocked. Not
* available on all platforms.
*
* Locking constants (in class File):
*
* LOCK_EX | Exclusive lock. Only one process may hold an
* | exclusive lock for a given file at a time.
* ----------+------------------------------------------------
* LOCK_NB | Don't block when locking. May be combined
* | with other lock options using logical or.
* ----------+------------------------------------------------
* LOCK_SH | Shared lock. Multiple processes may each hold a
* | shared lock for a given file at the same time.
* ----------+------------------------------------------------
* LOCK_UN | Unlock.
*
* Example:
*
* # update a counter using write lock
* # don't use "w" because it truncates the file before lock.
* File.open("counter", File::RDWR|File::CREAT, 0644) {|f|
* f.flock(File::LOCK_EX)
* value = f.read.to_i + 1
* f.rewind
* f.write("#{value}\n")
* f.flush
* f.truncate(f.pos)
* }
*
* # read the counter using read lock
* File.open("counter", "r") {|f|
* f.flock(File::LOCK_SH)
* p f.read
* }
*
*/

static VALUE
rb_file_flock(VALUE obj, SEL sel, VALUE operation)
{
#ifndef __CHECKER__
    rb_io_t *io;
    int op[2], op1;

    rb_secure(2);
    op[1] = op1 = NUM2INT(operation);
    GetOpenFile(obj, io);
    op[0] = io->fd;

// if (io->mode & FMODE_WRITABLE) {
// rb_io_flush(obj);
// }

    while (flock(op[0], op[1]) < 0) {
switch (errno) {
case EAGAIN:
case EACCES:
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
if (op1 & LOCK_NB) return Qfalse;
rb_thread_polling();
rb_io_check_closed(io);
continue;

case EINTR:
#if defined(ERESTART)
case ERESTART:
#endif
break;

default:
rb_sys_fail_path(io->path);
}
    }
#endif
    return INT2FIX(0);
}
#undef flock

static void
test_check(int n, int argc, VALUE *argv)
{
    int i;

    rb_secure(2);
    n+=1;
    if (n != argc) rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)", argc, n);
    for (i=1; i<n; i++) {
switch (TYPE(argv[i])) {
case T_STRING:
default:
FilePathValue(argv[i]);
break;
case T_FILE:
break;
}
    }
}

#define CHECK(n) test_check((n), argc, argv)

/*
* call-seq:
* test(int_cmd, file1 [, file2] ) -> obj
*
* Uses the integer <i>aCmd</i> to perform various tests on
* <i>file1</i> (first table below) or on <i>file1</i> and
* <i>file2</i> (second table).
*
* File tests on a single file:
*
* Test Returns Meaning
* "A" | Time | Last access time for file1
* "b" | boolean | True if file1 is a block device
* "c" | boolean | True if file1 is a character device
* "C" | Time | Last change time for file1
* "d" | boolean | True if file1 exists and is a directory
* "e" | boolean | True if file1 exists
* "f" | boolean | True if file1 exists and is a regular file
* "g" | boolean | True if file1 has the \CF{setgid} bit
* | | set (false under NT)
* "G" | boolean | True if file1 exists and has a group
* | | ownership equal to the caller's group
* "k" | boolean | True if file1 exists and has the sticky bit set
* "l" | boolean | True if file1 exists and is a symbolic link
* "M" | Time | Last modification time for file1
* "o" | boolean | True if file1 exists and is owned by
* | | the caller's effective uid
* "O" | boolean | True if file1 exists and is owned by
* | | the caller's real uid
* "p" | boolean | True if file1 exists and is a fifo
* "r" | boolean | True if file1 is readable by the effective
* | | uid/gid of the caller
* "R" | boolean | True if file is readable by the real
* | | uid/gid of the caller
* "s" | int/nil | If file1 has nonzero size, return the size,
* | | otherwise return nil
* "S" | boolean | True if file1 exists and is a socket
* "u" | boolean | True if file1 has the setuid bit set
* "w" | boolean | True if file1 exists and is writable by
* | | the effective uid/gid
* "W" | boolean | True if file1 exists and is writable by
* | | the real uid/gid
* "x" | boolean | True if file1 exists and is executable by
* | | the effective uid/gid
* "X" | boolean | True if file1 exists and is executable by
* | | the real uid/gid
* "z" | boolean | True if file1 exists and has a zero length
*
* Tests that take two files:
*
* "-" | boolean | True if file1 and file2 are identical
* "=" | boolean | True if the modification times of file1
* | | and file2 are equal
* "<" | boolean | True if the modification time of file1
* | | is prior to that of file2
* ">" | boolean | True if the modification time of file1
* | | is after that of file2
*/

static VALUE
rb_f_test(VALUE rcv, SEL sel, int argc, VALUE *argv)
{
    int cmd;

    if (argc == 0) rb_raise(rb_eArgError, "wrong number of arguments (0 for 2..3)");
    cmd = NUM2CHR(argv[0]);
    if (cmd == 0) goto unknown;
    if (strchr("bcdefgGkloOprRsSuwWxXz", cmd)) {
CHECK(1);
switch (cmd) {
case 'b':
return rb_file_blockdev_p(0, 0, argv[1]);

case 'c':
return rb_file_chardev_p(0, 0, argv[1]);

case 'd':
return rb_file_directory_p(0, 0, argv[1]);

case 'a':
case 'e':
return rb_file_exist_p(0, 0, argv[1]);

case 'f':
return rb_file_file_p(0, 0, argv[1]);

case 'g':
return rb_file_sgid_p(0, 0, argv[1]);

case 'G':
return rb_file_grpowned_p(0, 0, argv[1]);

case 'k':
return rb_file_sticky_p(0, 0, argv[1]);

case 'l':
return rb_file_symlink_p(0, 0, argv[1]);

case 'o':
return rb_file_owned_p(0, 0, argv[1]);

case 'O':
return rb_file_rowned_p(0, argv[1]);

case 'p':
return rb_file_pipe_p(0, 0, argv[1]);

case 'r':
return rb_file_readable_p(0, 0, argv[1]);

case 'R':
return rb_file_readable_real_p(0, 0, argv[1]);

case 's':
return rb_file_size_p(0, 0, argv[1]);

case 'S':
return rb_file_socket_p(0, 0, argv[1]);

case 'u':
return rb_file_suid_p(0, 0, argv[1]);

case 'w':
return rb_file_writable_p(0, 0, argv[1]);

case 'W':
return rb_file_writable_real_p(0, 0, argv[1]);

case 'x':
return rb_file_executable_p(0, 0, argv[1]);

case 'X':
return rb_file_executable_real_p(0, 0, argv[1]);

case 'z':
return rb_file_zero_p(0, 0, argv[1]);
}
    }

    if (strchr("MAC", cmd)) {
struct stat st;
VALUE fname = argv[1];

CHECK(1);
if (rb_stat(fname, &st) == -1) {
FilePathValue(fname);
rb_sys_fail(RSTRING_PTR(fname));
}

switch (cmd) {
case 'A':
return stat_atime(&st);
case 'M':
return stat_mtime(&st);
case 'C':
return stat_ctime(&st);
}
    }

    if (cmd == '-') {
CHECK(2);
return rb_file_identical_p(0, 0, argv[1], argv[2]);
    }

    if (strchr("=<>", cmd)) {
struct stat st1, st2;

CHECK(2);
if (rb_stat(argv[1], &st1) < 0) return Qfalse;
if (rb_stat(argv[2], &st2) < 0) return Qfalse;

switch (cmd) {
case '=':
if (st1.st_mtime == st2.st_mtime) return Qtrue;
return Qfalse;

case '>':
if (st1.st_mtime > st2.st_mtime) return Qtrue;
return Qfalse;

case '<':
if (st1.st_mtime < st2.st_mtime) return Qtrue;
return Qfalse;
}
    }
  unknown:
    /* unknown command */
    if (ISPRINT(cmd)) {
rb_raise(rb_eArgError, "unknown command '%s%c'", cmd == '\'' || cmd == '\\' ? "\\" : "", cmd);
    }
    else {
rb_raise(rb_eArgError, "unknown command \"\\x%02X\"", cmd);
    }
    return Qnil; /* not reached */
}


/*
* Document-class: File::Stat
*
* Objects of class <code>File::Stat</code> encapsulate common status
* information for <code>File</code> objects. The information is
* recorded at the moment the <code>File::Stat</code> object is
* created; changes made to the file after that point will not be
* reflected. <code>File::Stat</code> objects are returned by
* <code>IO#stat</code>, <code>File::stat</code>,
* <code>File#lstat</code>, and <code>File::lstat</code>. Many of these
* methods return platform-specific values, and not all values are
* meaningful on all systems. See also <code>Kernel#test</code>.
*/

static VALUE
rb_stat_s_alloc(VALUE klass)
{
    return stat_new_0(klass, 0);
}

/*
* call-seq:
*
* File::Stat.new(file_name) -> stat
*
* Create a File::Stat object for the given file name (raising an
* exception if the file doesn't exist).
*/

static VALUE
rb_stat_init(VALUE obj, SEL sel, VALUE fname)
{
    struct stat st, *nst;

    rb_secure(2);
    FilePathValue(fname);
    fname = rb_str_encode_ospath(fname);
    if (stat(StringValueCStr(fname), &st) == -1) {
rb_sys_fail(RSTRING_PTR(fname));
    }
    if (DATA_PTR(obj)) {
xfree(DATA_PTR(obj));
DATA_PTR(obj) = NULL;
    }
    nst = ALLOC(struct stat);
    *nst = st;
    GC_WB(&DATA_PTR(obj), nst);

    return Qnil;
}

/* :nodoc: */
static VALUE
rb_stat_init_copy(VALUE copy, SEL sel, VALUE orig)
{
    struct stat *nst;

    if (copy == orig) return orig;
    rb_check_frozen(copy);
    /* need better argument type check */
    if (!rb_obj_is_instance_of(orig, rb_obj_class(copy))) {
rb_raise(rb_eTypeError, "wrong argument class");
    }
    if (DATA_PTR(copy)) {
xfree(DATA_PTR(copy));
DATA_PTR(copy) = NULL;
    }
    if (DATA_PTR(orig)) {
nst = ALLOC(struct stat);
*nst = *(struct stat*)DATA_PTR(orig);
GC_WB(&DATA_PTR(copy), nst);
    }

    return copy;
}

/*
* call-seq:
* stat.ftype -> string
*
* Identifies the type of <i>stat</i>. The return string is one of:
* ``<code>file</code>'', ``<code>directory</code>'',
* ``<code>characterSpecial</code>'', ``<code>blockSpecial</code>'',
* ``<code>fifo</code>'', ``<code>link</code>'',
* ``<code>socket</code>'', or ``<code>unknown</code>''.
*
* File.stat("/dev/tty").ftype #=> "characterSpecial"
*
*/

static VALUE
rb_stat_ftype(VALUE obj, SEL sel)
{
    return rb_file_ftype(get_stat(obj));
}

/*
* call-seq:
* stat.directory? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is a directory,
* <code>false</code> otherwise.
*
* File.stat("testfile").directory? #=> false
* File.stat(".").directory? #=> true
*/

static VALUE
rb_stat_d(VALUE obj, SEL sel)
{
    if (S_ISDIR(get_stat(obj)->st_mode)) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* stat.pipe? -> true or false
*
* Returns <code>true</code> if the operating system supports pipes and
* <i>stat</i> is a pipe; <code>false</code> otherwise.
*/

static VALUE
rb_stat_p(VALUE obj, SEL sel)
{
#ifdef S_IFIFO
    if (S_ISFIFO(get_stat(obj)->st_mode)) return Qtrue;

#endif
    return Qfalse;
}

/*
* call-seq:
* stat.symlink? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is a symbolic link,
* <code>false</code> if it isn't or if the operating system doesn't
* support this feature. As <code>File::stat</code> automatically
* follows symbolic links, <code>symlink?</code> will always be
* <code>false</code> for an object returned by
* <code>File::stat</code>.
*
* File.symlink("testfile", "alink") #=> 0
* File.stat("alink").symlink? #=> false
* File.lstat("alink").symlink? #=> true
*
*/

static VALUE
rb_stat_l(VALUE obj, SEL sel)
{
#ifdef S_ISLNK
    if (S_ISLNK(get_stat(obj)->st_mode)) return Qtrue;
#endif
    return Qfalse;
}

/*
* call-seq:
* stat.socket? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is a socket,
* <code>false</code> if it isn't or if the operating system doesn't
* support this feature.
*
* File.stat("testfile").socket? #=> false
*
*/

static VALUE
rb_stat_S(VALUE obj, SEL sel)
{
#ifdef S_ISSOCK
    if (S_ISSOCK(get_stat(obj)->st_mode)) return Qtrue;

#endif
    return Qfalse;
}

/*
* call-seq:
* stat.blockdev? -> true or false
*
* Returns <code>true</code> if the file is a block device,
* <code>false</code> if it isn't or if the operating system doesn't
* support this feature.
*
* File.stat("testfile").blockdev? #=> false
* File.stat("/dev/hda1").blockdev? #=> true
*
*/

static VALUE
rb_stat_b(VALUE obj, SEL sel)
{
#ifdef S_ISBLK
    if (S_ISBLK(get_stat(obj)->st_mode)) return Qtrue;

#endif
    return Qfalse;
}

/*
* call-seq:
* stat.chardev? -> true or false
*
* Returns <code>true</code> if the file is a character device,
* <code>false</code> if it isn't or if the operating system doesn't
* support this feature.
*
* File.stat("/dev/tty").chardev? #=> true
*
*/

static VALUE
rb_stat_c(VALUE obj, SEL sel)
{
    if (S_ISCHR(get_stat(obj)->st_mode)) return Qtrue;

    return Qfalse;
}

/*
* call-seq:
* stat.owned? -> true or false
*
* Returns <code>true</code> if the effective user id of the process is
* the same as the owner of <i>stat</i>.
*
* File.stat("testfile").owned? #=> true
* File.stat("/etc/passwd").owned? #=> false
*
*/

static VALUE
rb_stat_owned(VALUE obj, SEL sel)
{
    if (get_stat(obj)->st_uid == geteuid()) return Qtrue;
    return Qfalse;
}

static VALUE
rb_stat_rowned(VALUE obj)
{
    if (get_stat(obj)->st_uid == getuid()) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* stat.grpowned? -> true or false
*
* Returns true if the effective group id of the process is the same as
* the group id of <i>stat</i>. On Windows NT, returns <code>false</code>.
*
* File.stat("testfile").grpowned? #=> true
* File.stat("/etc/passwd").grpowned? #=> false
*
*/

static VALUE
rb_stat_grpowned(VALUE obj, SEL sel)
{
#ifndef _WIN32
    if (group_member(get_stat(obj)->st_gid)) return Qtrue;
#endif
    return Qfalse;
}

/*
* call-seq:
* stat.readable? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is readable by the
* effective user id of this process.
*
* File.stat("testfile").readable? #=> true
*
*/

static VALUE
rb_stat_r(VALUE obj, SEL sel)
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (geteuid() == 0) return Qtrue;
#endif
#ifdef S_IRUSR
    if (rb_stat_owned(obj, 0))
return st->st_mode & S_IRUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IRGRP
    if (rb_stat_grpowned(obj, 0))
return st->st_mode & S_IRGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IROTH
    if (!(st->st_mode & S_IROTH)) return Qfalse;
#endif
    return Qtrue;
}

/*
* call-seq:
* stat.readable_real? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is readable by the real
* user id of this process.
*
* File.stat("testfile").readable_real? #=> true
*
*/

static VALUE
rb_stat_R(VALUE obj, SEL sel)
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (getuid() == 0) return Qtrue;
#endif
#ifdef S_IRUSR
    if (rb_stat_rowned(obj))
return st->st_mode & S_IRUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IRGRP
    if (group_member(get_stat(obj)->st_gid))
return st->st_mode & S_IRGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IROTH
    if (!(st->st_mode & S_IROTH)) return Qfalse;
#endif
    return Qtrue;
}

/*
* call-seq:
* stat.world_readable? -> fixnum or nil
*
* If <i>stat</i> is readable by others, returns an integer
* representing the file permission bits of <i>stat</i>. Returns
* <code>nil</code> otherwise. The meaning of the bits is platform
* dependent; on Unix systems, see <code>stat(2)</code>.
*
* m = File.stat("/etc/passwd").world_readable? #=> 420
* sprintf("%o", m) #=> "644"
*/

static VALUE
rb_stat_wr(VALUE obj, SEL sel)
{
#ifdef S_IROTH
    if ((get_stat(obj)->st_mode & (S_IROTH)) == S_IROTH) {
return UINT2NUM(get_stat(obj)->st_mode & (S_IRUGO|S_IWUGO|S_IXUGO));
    }
    else {
return Qnil;
    }
#endif
}

/*
* call-seq:
* stat.writable? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is writable by the
* effective user id of this process.
*
* File.stat("testfile").writable? #=> true
*
*/

static VALUE
rb_stat_w(VALUE obj, SEL sel)
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (geteuid() == 0) return Qtrue;
#endif
#ifdef S_IWUSR
    if (rb_stat_owned(obj, 0))
return st->st_mode & S_IWUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IWGRP
    if (rb_stat_grpowned(obj, 0))
return st->st_mode & S_IWGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IWOTH
    if (!(st->st_mode & S_IWOTH)) return Qfalse;
#endif
    return Qtrue;
}

/*
* call-seq:
* stat.writable_real? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is writable by the real
* user id of this process.
*
* File.stat("testfile").writable_real? #=> true
*
*/

static VALUE
rb_stat_W(VALUE obj, SEL sel)
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (getuid() == 0) return Qtrue;
#endif
#ifdef S_IWUSR
    if (rb_stat_rowned(obj))
return st->st_mode & S_IWUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IWGRP
    if (group_member(get_stat(obj)->st_gid))
return st->st_mode & S_IWGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IWOTH
    if (!(st->st_mode & S_IWOTH)) return Qfalse;
#endif
    return Qtrue;
}

/*
* call-seq:
* stat.world_writable? -> fixnum or nil
*
* If <i>stat</i> is writable by others, returns an integer
* representing the file permission bits of <i>stat</i>. Returns
* <code>nil</code> otherwise. The meaning of the bits is platform
* dependent; on Unix systems, see <code>stat(2)</code>.
*
* m = File.stat("/tmp").world_writable? #=> 511
* sprintf("%o", m) #=> "777"
*/

static VALUE
rb_stat_ww(VALUE obj, SEL sel)
{
#ifdef S_IROTH
    if ((get_stat(obj)->st_mode & (S_IWOTH)) == S_IWOTH) {
return UINT2NUM(get_stat(obj)->st_mode & (S_IRUGO|S_IWUGO|S_IXUGO));
    }
    else {
return Qnil;
    }
#endif
}

/*
* call-seq:
* stat.executable? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is executable or if the
* operating system doesn't distinguish executable files from
* nonexecutable files. The tests are made using the effective owner of
* the process.
*
* File.stat("testfile").executable? #=> false
*
*/

static VALUE
rb_stat_x(VALUE obj, SEL sel)
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (geteuid() == 0) {
return st->st_mode & S_IXUGO ? Qtrue : Qfalse;
    }
#endif
#ifdef S_IXUSR
    if (rb_stat_owned(obj, 0))
return st->st_mode & S_IXUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IXGRP
    if (rb_stat_grpowned(obj, 0))
return st->st_mode & S_IXGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IXOTH
    if (!(st->st_mode & S_IXOTH)) return Qfalse;
#endif
    return Qtrue;
}

/*
* call-seq:
* stat.executable_real? -> true or false
*
* Same as <code>executable?</code>, but tests using the real owner of
* the process.
*/

static VALUE
rb_stat_X(VALUE obj, SEL sel)
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (getuid() == 0) {
return st->st_mode & S_IXUGO ? Qtrue : Qfalse;
    }
#endif
#ifdef S_IXUSR
    if (rb_stat_rowned(obj))
return st->st_mode & S_IXUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IXGRP
    if (group_member(get_stat(obj)->st_gid))
return st->st_mode & S_IXGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IXOTH
    if (!(st->st_mode & S_IXOTH)) return Qfalse;
#endif
    return Qtrue;
}

/*
* call-seq:
* stat.file? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is a regular file (not
* a device file, pipe, socket, etc.).
*
* File.stat("testfile").file? #=> true
*
*/

static VALUE
rb_stat_f(VALUE obj, SEL sel)
{
    if (S_ISREG(get_stat(obj)->st_mode)) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* stat.zero? -> true or false
*
* Returns <code>true</code> if <i>stat</i> is a zero-length file;
* <code>false</code> otherwise.
*
* File.stat("testfile").zero? #=> false
*
*/

static VALUE
rb_stat_z(VALUE obj, SEL sel)
{
    if (get_stat(obj)->st_size == 0) return Qtrue;
    return Qfalse;
}

/*
* call-seq:
* state.size -> integer
*
* Returns the size of <i>stat</i> in bytes.
*
* File.stat("testfile").size #=> 66
*
*/

static VALUE
rb_stat_s(VALUE obj, SEL sel)
{
    off_t size = get_stat(obj)->st_size;

    if (size == 0) return Qnil;
    return OFFT2NUM(size);
}

/*
* call-seq:
* stat.setuid? -> true or false
*
* Returns <code>true</code> if <i>stat</i> has the set-user-id
* permission bit set, <code>false</code> if it doesn't or if the
* operating system doesn't support this feature.
*
* File.stat("/bin/su").setuid? #=> true
*/

static VALUE
rb_stat_suid(VALUE obj, SEL sel)
{
#ifdef S_ISUID
    if (get_stat(obj)->st_mode & S_ISUID) return Qtrue;
#endif
    return Qfalse;
}

/*
* call-seq:
* stat.setgid? -> true or false
*
* Returns <code>true</code> if <i>stat</i> has the set-group-id
* permission bit set, <code>false</code> if it doesn't or if the
* operating system doesn't support this feature.
*
* File.stat("/usr/sbin/lpc").setgid? #=> true
*
*/

static VALUE
rb_stat_sgid(VALUE obj, SEL sel)
{
#ifdef S_ISGID
    if (get_stat(obj)->st_mode & S_ISGID) return Qtrue;
#endif
    return Qfalse;
}

/*
* call-seq:
* stat.sticky? -> true or false
*
* Returns <code>true</code> if <i>stat</i> has its sticky bit set,
* <code>false</code> if it doesn't or if the operating system doesn't
* support this feature.
*
* File.stat("testfile").sticky? #=> false
*
*/

static VALUE
rb_stat_sticky(VALUE obj, SEL sel)
{
#ifdef S_ISVTX
    if (get_stat(obj)->st_mode & S_ISVTX) return Qtrue;
#endif
    return Qfalse;
}

VALUE rb_mFConst;

void
rb_file_const(const char *name, VALUE value)
{
    rb_define_const(rb_mFConst, name, value);
}

int
rb_is_absolute_path(const char *path)
{
    if (path[0] == '/') {
return 1;
    }
    return 0;
}

#ifndef ENABLE_PATH_CHECK
# define ENABLE_PATH_CHECK 1
#endif

#if ENABLE_PATH_CHECK
static int
path_check_0(VALUE path, int execpath)
{
    struct stat st;
    const char *p0 = StringValueCStr(path);
    char *p = 0, *s;

    if (!rb_is_absolute_path(p0)) {
VALUE newpath = ruby_getcwd();
rb_str_cat2(newpath, "/");
rb_str_cat2(newpath, p0);
path = newpath;
p0 = RSTRING_PTR(path);
    }
    for (;;) {
#ifndef S_IWOTH
# define S_IWOTH 002
#endif
if (stat(p0, &st) == 0 && S_ISDIR(st.st_mode) && (st.st_mode & S_IWOTH)
#ifdef S_ISVTX
&& !(p && execpath && (st.st_mode & S_ISVTX))
#endif
&& !access(p0, W_OK)) {
rb_warn("Insecure world writable dir %s in %sPATH, mode 0%o",
p0, (execpath ? "" : "LOAD_"), st.st_mode);
if (p) *p = '/';
return 0;
}
s = strrdirsep(p0);
if (p) *p = '/';
if (!s || s == p0) return 1;
p = s;
*p = '\0';
    }
}
#endif

#if ENABLE_PATH_CHECK
#define fpath_check(path) path_check_0(path, FALSE)
#else
#define fpath_check(path) 1
#endif

int
rb_path_check(const char *path)
{
#if ENABLE_PATH_CHECK
    const char *p0, *p, *pend;
    const char sep = PATH_SEP_CHAR;

    if (!path) return 1;

    pend = path + strlen(path);
    p0 = path;
    p = strchr(path, sep);
    if (!p) p = pend;

    for (;;) {
if (!path_check_0(rb_str_new(p0, p - p0), TRUE)) {
return 0; /* not safe */
}
p0 = p + 1;
if (p0 > pend) break;
p = strchr(p0, sep);
if (!p) p = pend;
    }
#endif
    return 1;
}

static int
file_load_ok(const char *path)
{
    int ret = 1;
    int fd = open(path, O_RDONLY);
    if (fd == -1) return 0;
#if !defined DOSISH
    {
struct stat st;
if (fstat(fd, &st) || !S_ISREG(st.st_mode)) {
ret = 0;
}
    }
#endif
    (void)close(fd);
    return ret;
}

int
rb_file_load_ok(const char *path)
{
    return file_load_ok(path);
}

static int
is_explicit_relative(const char *path)
{
    if (*path++ != '.') return 0;
    if (*path == '.') path++;
    return isdirsep(*path);
}

VALUE rb_get_load_path(void);

static VALUE
copy_path_class(VALUE path, VALUE orig)
{
    RBASIC(path)->klass = rb_obj_class(orig);
    OBJ_FREEZE(path);
    return path;
}

int
rb_find_file_ext(VALUE *filep, const char *const *ext)
{
    return rb_find_file_ext_safe(filep, ext, rb_safe_level());
}

int
rb_find_file_ext_safe(VALUE *filep, const char *const *ext, int safe_level)
{
    const char *f = StringValueCStr(*filep);
    VALUE fname = *filep, load_path, tmp;
    long i, j, fnlen;
    int expanded = 0;

    if (!ext[0]) return 0;

    if (f[0] == '~') {
fname = rb_file_expand_path(*filep, Qnil);
if (safe_level >= 1 && OBJ_TAINTED(fname)) {
rb_raise(rb_eSecurityError, "loading from unsafe file %s", f);
}
f = RSTRING_PTR(fname);
*filep = fname;
expanded = 1;
    }

    if (expanded || rb_is_absolute_path(f) || is_explicit_relative(f)) {
if (safe_level >= 1 && !fpath_check(fname)) {
rb_raise(rb_eSecurityError, "loading from unsafe path %s", f);
}
if (!expanded) fname = rb_file_expand_path(fname, Qnil);
fnlen = RSTRING_LEN(fname);
for (i=0; ext[i]; i++) {
rb_str_cat2(fname, ext[i]);
if (file_load_ok(RSTRING_PTR(fname))) {
*filep = copy_path_class(fname, *filep);
return (int)(i+1);
}
rb_str_set_len(fname, fnlen);
}
return 0;
    }

    if (safe_level >= 4) {
rb_raise(rb_eSecurityError, "loading from non-absolute path %s", f);
    }

    load_path = rb_get_load_path();
    if (!load_path) return 0;

    fname = rb_str_dup(*filep);
    RBASIC(fname)->klass = 0;
    fnlen = RSTRING_LEN(fname);
    for (j=0; ext[j]; j++) {
rb_str_cat2(fname, ext[j]);
for (i = 0; i < RARRAY_LEN(load_path); i++) {
VALUE str = RARRAY_AT(load_path, i);

str = rb_get_path_check(str, safe_level);
if (RSTRING_LEN(str) == 0) continue;
tmp = rb_file_expand_path(fname, str);
if (file_load_ok(RSTRING_PTR(tmp))) {
*filep = copy_path_class(tmp, *filep);
return (int)(j+1);
}
FL_UNSET(tmp, FL_TAINT | FL_UNTRUSTED);
}
rb_str_set_len(fname, fnlen);
    }
    RB_GC_GUARD(load_path);
    return 0;
}

VALUE
rb_find_file(VALUE path)
{
    return rb_find_file_safe(path, rb_safe_level());
}

VALUE
rb_find_file_safe(VALUE path, int safe_level)
{
    VALUE tmp, load_path;
    const char *f = StringValueCStr(path);
    int expanded = 0;

    if (f[0] == '~') {
tmp = rb_file_expand_path(path, Qnil);
if (safe_level >= 1 && OBJ_TAINTED(tmp)) {
rb_raise(rb_eSecurityError, "loading from unsafe file %s", f);
}
path = copy_path_class(tmp, path);
f = RSTRING_PTR(path);
expanded = 1;
    }

    if (expanded || rb_is_absolute_path(f) || is_explicit_relative(f)) {
if (safe_level >= 1 && !fpath_check(path)) {
rb_raise(rb_eSecurityError, "loading from unsafe path %s", f);
}
if (!file_load_ok(f)) return 0;
if (!expanded)
path = copy_path_class(rb_file_expand_path(path, Qnil), path);
return path;
    }

    if (safe_level >= 4) {
rb_raise(rb_eSecurityError, "loading from non-absolute path %s", f);
    }

    load_path = rb_get_load_path();
    if (load_path) {
long i, count;

for (i=0, count=RARRAY_LEN(load_path);i < count;i++) {
VALUE str = RARRAY_AT(load_path, i);
str = rb_get_path_check(str, safe_level);
if (RSTRING_LEN(str) > 0) {
tmp = rb_file_expand_path(path, str);
f = RSTRING_PTR(tmp);
if (file_load_ok(f)) goto found;
}
}
return 0;
    }
    else {
return 0; /* no path, no load */
    }

  found:
    if (safe_level >= 1 && !fpath_check(tmp)) {
rb_raise(rb_eSecurityError, "loading from unsafe file %s", f);
    }

    return copy_path_class(tmp, path);
}

static void
define_filetest_function(const char *name, VALUE (*func)(ANYARGS), int argc)
{
    rb_objc_define_method(*(VALUE *)rb_mFileTest, name, func, argc);
    rb_objc_define_method(*(VALUE *)rb_cFile, name, func, argc);
}


/*
* A <code>File</code> is an abstraction of any file object accessible
* by the program and is closely associated with class <code>IO</code>
* <code>File</code> includes the methods of module
* <code>FileTest</code> as class methods, allowing you to write (for
* example) <code>File.exist?("foo")</code>.
*
* In the description of File methods,
* <em>permission bits</em> are a platform-specific
* set of bits that indicate permissions of a file. On Unix-based
* systems, permissions are viewed as a set of three octets, for the
* owner, the group, and the rest of the world. For each of these
* entities, permissions may be set to read, write, or execute the
* file:
*
* The permission bits <code>0644</code> (in octal) would thus be
* interpreted as read/write for owner, and read-only for group and
* other. Higher-order bits may also be used to indicate the type of
* file (plain, directory, pipe, socket, and so on) and various other
* special features. If the permissions are for a directory, the
* meaning of the execute bit changes; when set the directory can be
* searched.
*
* On non-Posix operating systems, there may be only the ability to
* make a file read-only or read-write. In this case, the remaining
* permission bits will be synthesized to resemble typical values. For
* instance, on Windows NT the default permission bits are
* <code>0644</code>, which means read/write for owner, read-only for
* all others. The only change that can be made is to make the file
* read-only, which is reported as <code>0444</code>.
*/

void
Init_File(void)
{
    rb_mFileTest = rb_define_module("FileTest");
    rb_cFile = rb_define_class("File", rb_cIO);

    selToPath = sel_registerName("to_path");

    define_filetest_function("directory?", rb_file_directory_p, 1);
    define_filetest_function("exist?", rb_file_exist_p, 1);
    define_filetest_function("exists?", rb_file_exist_p, 1);
    define_filetest_function("readable?", rb_file_readable_p, 1);
    define_filetest_function("readable_real?", rb_file_readable_real_p, 1);
    define_filetest_function("world_readable?", rb_file_world_readable_p, 1);
    define_filetest_function("writable?", rb_file_writable_p, 1);
    define_filetest_function("writable_real?", rb_file_writable_real_p, 1);
    define_filetest_function("world_writable?", rb_file_world_writable_p, 1);
    define_filetest_function("executable?", rb_file_executable_p, 1);
    define_filetest_function("executable_real?", rb_file_executable_real_p, 1);
    define_filetest_function("file?", rb_file_file_p, 1);
    define_filetest_function("zero?", rb_file_zero_p, 1);
    define_filetest_function("size?", rb_file_size_p, 1);
    define_filetest_function("size", rb_file_s_size, 1);
    define_filetest_function("owned?", rb_file_owned_p, 1);
    define_filetest_function("grpowned?", rb_file_grpowned_p, 1);

    define_filetest_function("pipe?", rb_file_pipe_p, 1);
    define_filetest_function("symlink?", rb_file_symlink_p, 1);
    define_filetest_function("socket?", rb_file_socket_p, 1);

    define_filetest_function("blockdev?", rb_file_blockdev_p, 1);
    define_filetest_function("chardev?", rb_file_chardev_p, 1);

    define_filetest_function("setuid?", rb_file_suid_p, 1);
    define_filetest_function("setgid?", rb_file_sgid_p, 1);
    define_filetest_function("sticky?", rb_file_sticky_p, 1);

    define_filetest_function("identical?", rb_file_identical_p, 2);

    VALUE rb_ccFile = *(VALUE *)rb_cFile;
    rb_objc_define_method(rb_ccFile, "stat", rb_file_s_stat, 1);
    rb_objc_define_method(rb_ccFile, "lstat", rb_file_s_lstat, 1);
    rb_objc_define_method(rb_ccFile, "ftype", rb_file_s_ftype, 1);

    rb_objc_define_method(rb_ccFile, "atime", rb_file_s_atime, 1);
    rb_objc_define_method(rb_ccFile, "mtime", rb_file_s_mtime, 1);
    rb_objc_define_method(rb_ccFile, "ctime", rb_file_s_ctime, 1);

    rb_objc_define_method(rb_ccFile, "utime", rb_file_s_utime, -1);
    rb_objc_define_method(rb_ccFile, "chmod", rb_file_s_chmod, -1);
    rb_objc_define_method(rb_ccFile, "chown", rb_file_s_chown, -1);
    rb_objc_define_method(rb_ccFile, "lchmod", rb_file_s_lchmod, -1);
    rb_objc_define_method(rb_ccFile, "lchown", rb_file_s_lchown, -1);

    rb_objc_define_method(rb_ccFile, "link", rb_file_s_link, 2);
    rb_objc_define_method(rb_ccFile, "symlink", rb_file_s_symlink, 2);
    rb_objc_define_method(rb_ccFile, "readlink", rb_file_s_readlink, 1);

    rb_objc_define_method(rb_ccFile, "unlink", rb_file_s_unlink, -1);
    rb_objc_define_method(rb_ccFile, "delete", rb_file_s_unlink, -1);
    rb_objc_define_method(rb_ccFile, "rename", rb_file_s_rename, 2);
    rb_objc_define_method(rb_ccFile, "umask", rb_file_s_umask, -1);
    rb_objc_define_method(rb_ccFile, "truncate", rb_file_s_truncate, 2);
    rb_objc_define_method(rb_ccFile, "expand_path", rb_file_s_expand_path, -1);
    rb_objc_define_method(rb_ccFile, "absolute_path", rb_file_s_absolute_path, -1);
    rb_objc_define_method(rb_ccFile, "realpath", rb_file_s_realpath, -1);
    rb_objc_define_method(rb_ccFile, "realdirpath", rb_file_s_realdirpath, -1);
    rb_objc_define_method(rb_ccFile, "basename", rb_file_s_basename, -1);
    rb_objc_define_method(rb_ccFile, "dirname", rb_file_s_dirname, 1);
    rb_objc_define_method(rb_ccFile, "extname", rb_file_s_extname, 1);
    rb_objc_define_method(rb_ccFile, "path", rb_file_s_path, 1);

    separator = rb_obj_freeze(rb_usascii_str_new2("/"));
    rb_define_const(rb_cFile, "Separator", separator);
    rb_define_const(rb_cFile, "SEPARATOR", separator);
    rb_objc_define_method(rb_ccFile, "split", rb_file_s_split, 1);
    rb_objc_define_method(rb_ccFile, "join", rb_file_s_join, -2);

    rb_define_const(rb_cFile, "ALT_SEPARATOR", Qnil);
    rb_define_const(rb_cFile, "PATH_SEPARATOR", rb_obj_freeze(rb_str_new2(PATH_SEP)));

    rb_objc_define_method(rb_cIO, "stat", rb_io_stat, 0); /* this is IO's method */
    rb_objc_define_method(rb_cFile, "lstat", rb_file_lstat, 0);

    rb_objc_define_method(rb_cFile, "atime", rb_file_atime, 0);
    rb_objc_define_method(rb_cFile, "mtime", rb_file_mtime, 0);
    rb_objc_define_method(rb_cFile, "ctime", rb_file_ctime, 0);
    rb_objc_define_method(rb_cFile, "size", rb_file_size, 0);

    rb_objc_define_method(rb_cFile, "chmod", rb_file_chmod, 1);
    rb_objc_define_method(rb_cFile, "chown", rb_file_chown, 2);
    rb_objc_define_method(rb_cFile, "truncate", rb_file_truncate, 1);

    rb_objc_define_method(rb_cFile, "flock", rb_file_flock, 1);

    rb_mFConst = rb_define_module_under(rb_cFile, "Constants");
    rb_include_module(rb_cIO, rb_mFConst);
    rb_file_const("LOCK_SH", INT2FIX(LOCK_SH));
    rb_file_const("LOCK_EX", INT2FIX(LOCK_EX));
    rb_file_const("LOCK_UN", INT2FIX(LOCK_UN));
    rb_file_const("LOCK_NB", INT2FIX(LOCK_NB));

    rb_objc_define_method(rb_cFile, "path", rb_file_path, 0);
    rb_objc_define_method(rb_cFile, "to_path", rb_file_path, 0);
    rb_objc_define_module_function(rb_mKernel, "test", rb_f_test, -1);

    rb_cStat = rb_define_class_under(rb_cFile, "Stat", rb_cObject);
    rb_objc_define_method(*(VALUE *)rb_cStat, "alloc", rb_stat_s_alloc, 0);
    rb_objc_define_method(rb_cStat, "initialize", rb_stat_init, 1);
    rb_objc_define_method(rb_cStat, "initialize_copy", rb_stat_init_copy, 1);

    rb_include_module(rb_cStat, rb_mComparable);

    rb_objc_define_method(rb_cStat, "<=>", rb_stat_cmp, 1);

    rb_objc_define_method(rb_cStat, "dev", rb_stat_dev, 0);
    rb_objc_define_method(rb_cStat, "dev_major", rb_stat_dev_major, 0);
    rb_objc_define_method(rb_cStat, "dev_minor", rb_stat_dev_minor, 0);
    rb_objc_define_method(rb_cStat, "ino", rb_stat_ino, 0);
    rb_objc_define_method(rb_cStat, "mode", rb_stat_mode, 0);
    rb_objc_define_method(rb_cStat, "nlink", rb_stat_nlink, 0);
    rb_objc_define_method(rb_cStat, "uid", rb_stat_uid, 0);
    rb_objc_define_method(rb_cStat, "gid", rb_stat_gid, 0);
    rb_objc_define_method(rb_cStat, "rdev", rb_stat_rdev, 0);
    rb_objc_define_method(rb_cStat, "rdev_major", rb_stat_rdev_major, 0);
    rb_objc_define_method(rb_cStat, "rdev_minor", rb_stat_rdev_minor, 0);
    rb_objc_define_method(rb_cStat, "size", rb_stat_size, 0);
    rb_objc_define_method(rb_cStat, "blksize", rb_stat_blksize, 0);
    rb_objc_define_method(rb_cStat, "blocks", rb_stat_blocks, 0);
    rb_objc_define_method(rb_cStat, "atime", rb_stat_atime, 0);
    rb_objc_define_method(rb_cStat, "mtime", rb_stat_mtime, 0);
    rb_objc_define_method(rb_cStat, "ctime", rb_stat_ctime, 0);

    rb_objc_define_method(rb_cStat, "inspect", rb_stat_inspect, 0);

    rb_objc_define_method(rb_cStat, "ftype", rb_stat_ftype, 0);

    rb_objc_define_method(rb_cStat, "directory?", rb_stat_d, 0);
    rb_objc_define_method(rb_cStat, "readable?", rb_stat_r, 0);
    rb_objc_define_method(rb_cStat, "readable_real?", rb_stat_R, 0);
    rb_objc_define_method(rb_cStat, "world_readable?", rb_stat_wr, 0);
    rb_objc_define_method(rb_cStat, "writable?", rb_stat_w, 0);
    rb_objc_define_method(rb_cStat, "writable_real?", rb_stat_W, 0);
    rb_objc_define_method(rb_cStat, "world_writable?", rb_stat_ww, 0);
    rb_objc_define_method(rb_cStat, "executable?", rb_stat_x, 0);
    rb_objc_define_method(rb_cStat, "executable_real?", rb_stat_X, 0);
    rb_objc_define_method(rb_cStat, "file?", rb_stat_f, 0);
    rb_objc_define_method(rb_cStat, "zero?", rb_stat_z, 0);
    rb_objc_define_method(rb_cStat, "size?", rb_stat_s, 0);
    rb_objc_define_method(rb_cStat, "owned?", rb_stat_owned, 0);
    rb_objc_define_method(rb_cStat, "grpowned?", rb_stat_grpowned, 0);

    rb_objc_define_method(rb_cStat, "pipe?", rb_stat_p, 0);
    rb_objc_define_method(rb_cStat, "symlink?", rb_stat_l, 0);
    rb_objc_define_method(rb_cStat, "socket?", rb_stat_S, 0);

    rb_objc_define_method(rb_cStat, "blockdev?", rb_stat_b, 0);
    rb_objc_define_method(rb_cStat, "chardev?", rb_stat_c, 0);

    rb_objc_define_method(rb_cStat, "setuid?", rb_stat_suid, 0);
    rb_objc_define_method(rb_cStat, "setgid?", rb_stat_sgid, 0);
    rb_objc_define_method(rb_cStat, "sticky?", rb_stat_sticky, 0);
}
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