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/**********************************************************************

dir.c -

$Author$
created at: Wed Jan 5 09:51:01 JST 1994

Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan

**********************************************************************/

#include "ruby/ruby.h"
#include "ruby/encoding.h"
#include "internal.h"

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

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

#if defined HAVE_DIRENT_H && !defined _WIN32
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#elif defined HAVE_DIRECT_H && !defined _WIN32
# include <direct.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# if HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# if HAVE_NDIR_H
# include <ndir.h>
# endif
# ifdef _WIN32
# include "win32/dir.h"
# endif
#endif
#if defined(__native_client__) && defined(NACL_NEWLIB)
# include "nacl/dirent.h"
# include "nacl/stat.h"
#endif

#include <errno.h>

#ifndef HAVE_STDLIB_H
char *getenv();
#endif

#ifndef HAVE_STRING_H
char *strchr(char*,char);
#endif

#include <ctype.h>

#include "ruby/util.h"

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

/* define system APIs */
#ifdef _WIN32
#undef chdir
#define chdir(p) rb_w32_uchdir(p)
#undef mkdir
#define mkdir(p, m) rb_w32_umkdir((p), (m))
#undef rmdir
#define rmdir(p) rb_w32_urmdir(p)
#undef opendir
#define opendir(p) rb_w32_uopendir(p)
#endif

#define rb_sys_fail_path(path) rb_sys_fail_str(path)

#define FNM_NOESCAPE 0x01
#define FNM_PATHNAME 0x02
#define FNM_DOTMATCH 0x04
#define FNM_CASEFOLD 0x08
#if CASEFOLD_FILESYSTEM
#define FNM_SYSCASE FNM_CASEFOLD
#else
#define FNM_SYSCASE 0
#endif

#define FNM_NOMATCH 1
#define FNM_ERROR 2

# define Next(p, e, enc) ((p)+ rb_enc_mbclen((p), (e), (enc)))
# define Inc(p, e, enc) ((p) = Next((p), (e), (enc)))

static char *
bracket(
    const char *p, /* pattern (next to '[') */
    const char *pend,
    const char *s, /* string */
    const char *send,
    int flags,
    rb_encoding *enc)
{
    const int nocase = flags & FNM_CASEFOLD;
    const int escape = !(flags & FNM_NOESCAPE);
    unsigned int c1, c2;
    int r;
    int ok = 0, not = 0;

    if (p >= pend) return NULL;
    if (*p == '!' || *p == '^') {
not = 1;
p++;
    }

    while (*p != ']') {
const char *t1 = p;
if (escape && *t1 == '\\')
t1++;
if (!*t1)
return NULL;
p = t1 + (r = rb_enc_mbclen(t1, pend, enc));
if (p >= pend) return NULL;
if (p[0] == '-' && p[1] != ']') {
const char *t2 = p + 1;
int r2;
if (escape && *t2 == '\\')
t2++;
if (!*t2)
return NULL;
p = t2 + (r2 = rb_enc_mbclen(t2, pend, enc));
if (ok) continue;
if ((r <= (send-s) && memcmp(t1, s, r) == 0) ||
(r2 <= (send-s) && memcmp(t2, s, r) == 0)) {
ok = 1;
continue;
}
c1 = rb_enc_codepoint(s, send, enc);
if (nocase) c1 = rb_enc_toupper(c1, enc);
c2 = rb_enc_codepoint(t1, pend, enc);
if (nocase) c2 = rb_enc_toupper(c2, enc);
if (c1 < c2) continue;
c2 = rb_enc_codepoint(t2, pend, enc);
if (nocase) c2 = rb_enc_toupper(c2, enc);
if (c1 > c2) continue;
}
else {
if (ok) continue;
if (r <= (send-s) && memcmp(t1, s, r) == 0) {
ok = 1;
continue;
}
if (!nocase) continue;
c1 = rb_enc_toupper(rb_enc_codepoint(s, send, enc), enc);
c2 = rb_enc_toupper(rb_enc_codepoint(p, pend, enc), enc);
if (c1 != c2) continue;
}
ok = 1;
    }

    return ok == not ? NULL : (char *)p + 1;
}

/* If FNM_PATHNAME is set, only path element will be matched. (upto '/' or '\0')
Otherwise, entire string will be matched.
End marker itself won't be compared.
And if function succeeds, *pcur reaches end marker.
*/
#define UNESCAPE(p) (escape && *(p) == '\\' ? (p) + 1 : (p))
#define ISEND(p) (!*(p) || (pathname && *(p) == '/'))
#define RETURN(val) return *pcur = p, *scur = s, (val);

static int
fnmatch_helper(
    const char **pcur, /* pattern */
    const char **scur, /* string */
    int flags,
    rb_encoding *enc)
{
    const int period = !(flags & FNM_DOTMATCH);
    const int pathname = flags & FNM_PATHNAME;
    const int escape = !(flags & FNM_NOESCAPE);
    const int nocase = flags & FNM_CASEFOLD;

    const char *ptmp = 0;
    const char *stmp = 0;

    const char *p = *pcur;
    const char *pend = p + strlen(p);
    const char *s = *scur;
    const char *send = s + strlen(s);

    int r;

    if (period && *s == '.' && *UNESCAPE(p) != '.') /* leading period */
RETURN(FNM_NOMATCH);

    while (1) {
switch (*p) {
case '*':
do { p++; } while (*p == '*');
if (ISEND(UNESCAPE(p))) {
p = UNESCAPE(p);
RETURN(0);
}
if (ISEND(s))
RETURN(FNM_NOMATCH);
ptmp = p;
stmp = s;
continue;

case '?':
if (ISEND(s))
RETURN(FNM_NOMATCH);
p++;
Inc(s, send, enc);
continue;

case '[': {
const char *t;
if (ISEND(s))
RETURN(FNM_NOMATCH);
if ((t = bracket(p + 1, pend, s, send, flags, enc)) != 0) {
p = t;
Inc(s, send, enc);
continue;
}
goto failed;
}
}

/* ordinary */
p = UNESCAPE(p);
if (ISEND(s))
RETURN(ISEND(p) ? 0 : FNM_NOMATCH);
if (ISEND(p))
goto failed;
r = rb_enc_precise_mbclen(p, pend, enc);
if (!MBCLEN_CHARFOUND_P(r))
goto failed;
if (r <= (send-s) && memcmp(p, s, r) == 0) {
p += r;
s += r;
continue;
}
if (!nocase) goto failed;
if (rb_enc_toupper(rb_enc_codepoint(p, pend, enc), enc) !=
rb_enc_toupper(rb_enc_codepoint(s, send, enc), enc))
goto failed;
p += r;
Inc(s, send, enc);
continue;

      failed: /* try next '*' position */
if (ptmp && stmp) {
p = ptmp;
Inc(stmp, send, enc); /* !ISEND(*stmp) */
s = stmp;
continue;
}
RETURN(FNM_NOMATCH);
    }
}

static int
fnmatch(
    const char *pattern,
    rb_encoding *enc,
    const char *string,
    int flags)
{
    const char *p = pattern;
    const char *s = string;
    const char *send = s + strlen(string);
    const int period = !(flags & FNM_DOTMATCH);
    const int pathname = flags & FNM_PATHNAME;

    const char *ptmp = 0;
    const char *stmp = 0;

    if (pathname) {
while (1) {
if (p[0] == '*' && p[1] == '*' && p[2] == '/') {
do { p += 3; } while (p[0] == '*' && p[1] == '*' && p[2] == '/');
ptmp = p;
stmp = s;
}
if (fnmatch_helper(&p, &s, flags, enc) == 0) {
while (*s && *s != '/') Inc(s, send, enc);
if (*p && *s) {
p++;
s++;
continue;
}
if (!*p && !*s)
return 0;
}
/* failed : try next recursion */
if (ptmp && stmp && !(period && *stmp == '.')) {
while (*stmp && *stmp != '/') Inc(stmp, send, enc);
if (*stmp) {
p = ptmp;
stmp++;
s = stmp;
continue;
}
}
return FNM_NOMATCH;
}
    }
    else
return fnmatch_helper(&p, &s, flags, enc);
}

VALUE rb_cDir;

struct dir_data {
    DIR *dir;
    VALUE path;
    rb_encoding *enc;
};

static void
dir_mark(void *ptr)
{
    struct dir_data *dir = ptr;
    rb_gc_mark(dir->path);
}

static void
dir_free(void *ptr)
{
    struct dir_data *dir = ptr;
    if (dir) {
if (dir->dir) closedir(dir->dir);
    }
    xfree(dir);
}

static size_t
dir_memsize(const void *ptr)
{
    return ptr ? sizeof(struct dir_data) : 0;
}

static const rb_data_type_t dir_data_type = {
    "dir",
    {dir_mark, dir_free, dir_memsize,},
};

static VALUE dir_close(VALUE);

#define GlobPathValue(str, safe) \
/* can contain null bytes as separators */ \
(!RB_TYPE_P((str), T_STRING) ? \
(void)FilePathValue(str) : \
(void)(check_safe_glob((str), (safe)), \
check_glob_encoding(str), (str)))
#define check_safe_glob(str, safe) ((safe) ? rb_check_safe_obj(str) : (void)0)
#define check_glob_encoding(str) rb_enc_check((str), rb_enc_from_encoding(rb_usascii_encoding()))

static VALUE
dir_s_alloc(VALUE klass)
{
    struct dir_data *dirp;
    VALUE obj = TypedData_Make_Struct(klass, struct dir_data, &dir_data_type, dirp);

    dirp->dir = NULL;
    dirp->path = Qnil;
    dirp->enc = NULL;

    return obj;
}

/*
* call-seq:
* Dir.new( string ) -> aDir
*
* Returns a new directory object for the named directory.
*/
static VALUE
dir_initialize(int argc, VALUE *argv, VALUE dir)
{
    struct dir_data *dp;
    rb_encoding *fsenc;
    VALUE dirname, opt, orig;
    static VALUE sym_enc;

    if (!sym_enc) {
sym_enc = ID2SYM(rb_intern("encoding"));
    }
    fsenc = rb_filesystem_encoding();

    rb_scan_args(argc, argv, "1:", &dirname, &opt);

    if (!NIL_P(opt)) {
VALUE enc = rb_hash_aref(opt, sym_enc);
if (!NIL_P(enc)) {
fsenc = rb_to_encoding(enc);
}
    }

    GlobPathValue(dirname, FALSE);
    orig = rb_str_dup_frozen(dirname);
    dirname = rb_str_encode_ospath(dirname);
    dirname = rb_str_dup_frozen(dirname);

    TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dp);
    if (dp->dir) closedir(dp->dir);
    dp->dir = NULL;
    dp->path = Qnil;
    dp->enc = fsenc;
    dp->dir = opendir(RSTRING_PTR(dirname));
    if (dp->dir == NULL) {
if (errno == EMFILE || errno == ENFILE) {
rb_gc();
dp->dir = opendir(RSTRING_PTR(dirname));
}
if (dp->dir == NULL) {
rb_sys_fail_path(orig);
}
    }
    dp->path = orig;

    return dir;
}

/*
* call-seq:
* Dir.open( string ) -> aDir
* Dir.open( string ) {| aDir | block } -> anObject
*
* With no block, <code>open</code> is a synonym for
* <code>Dir::new</code>. If a block is present, it is passed
* <i>aDir</i> as a parameter. The directory is closed at the end of
* the block, and <code>Dir::open</code> returns the value of the
* block.
*/
static VALUE
dir_s_open(int argc, VALUE *argv, VALUE klass)
{
    struct dir_data *dp;
    VALUE dir = TypedData_Make_Struct(klass, struct dir_data, &dir_data_type, dp);

    dir_initialize(argc, argv, dir);
    if (rb_block_given_p()) {
return rb_ensure(rb_yield, dir, dir_close, dir);
    }

    return dir;
}

static void
dir_closed(void)
{
    rb_raise(rb_eIOError, "closed directory");
}

static struct dir_data *
dir_check(VALUE dir)
{
    struct dir_data *dirp;
    if (!OBJ_UNTRUSTED(dir) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: operation on trusted Dir");
    rb_check_frozen(dir);
    dirp = rb_check_typeddata(dir, &dir_data_type);
    if (!dirp->dir) dir_closed();
    return dirp;
}

#define GetDIR(obj, dirp) ((dirp) = dir_check(obj))


/*
* call-seq:
* dir.inspect -> string
*
* Return a string describing this Dir object.
*/
static VALUE
dir_inspect(VALUE dir)
{
    struct dir_data *dirp;

    TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dirp);
    if (!NIL_P(dirp->path)) {
VALUE str = rb_str_new_cstr("#<");
rb_str_append(str, rb_class_name(CLASS_OF(dir)));
rb_str_cat2(str, ":");
rb_str_append(str, dirp->path);
rb_str_cat2(str, ">");
return str;
    }
    return rb_funcall(dir, rb_intern("to_s"), 0, 0);
}

/*
* call-seq:
* dir.path -> string or nil
*
* Returns the path parameter passed to <em>dir</em>'s constructor.
*
* d = Dir.new("..")
* d.path #=> ".."
*/
static VALUE
dir_path(VALUE dir)
{
    struct dir_data *dirp;

    TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dirp);
    if (NIL_P(dirp->path)) return Qnil;
    return rb_str_dup(dirp->path);
}

#if defined HAVE_READDIR_R
# define READDIR(dir, enc, entry, dp) (readdir_r((dir), (entry), &(dp)) == 0 && (dp) != 0)
#elif defined _WIN32
# define READDIR(dir, enc, entry, dp) (((dp) = rb_w32_readdir_with_enc((dir), (enc))) != 0)
#else
# define READDIR(dir, enc, entry, dp) (((dp) = readdir(dir)) != 0)
#endif
#if defined HAVE_READDIR_R
# define IF_HAVE_READDIR_R(something) something
#else
# define IF_HAVE_READDIR_R(something) /* nothing */
#endif

#if defined SIZEOF_STRUCT_DIRENT_TOO_SMALL
# include <limits.h>
# define NAME_MAX_FOR_STRUCT_DIRENT 255
# if defined NAME_MAX
# if NAME_MAX_FOR_STRUCT_DIRENT < NAME_MAX
# undef NAME_MAX_FOR_STRUCT_DIRENT
# define NAME_MAX_FOR_STRUCT_DIRENT NAME_MAX
# endif
# endif
# if defined _POSIX_NAME_MAX
# if NAME_MAX_FOR_STRUCT_DIRENT < _POSIX_NAME_MAX
# undef NAME_MAX_FOR_STRUCT_DIRENT
# define NAME_MAX_FOR_STRUCT_DIRENT _POSIX_NAME_MAX
# endif
# endif
# if defined _XOPEN_NAME_MAX
# if NAME_MAX_FOR_STRUCT_DIRENT < _XOPEN_NAME_MAX
# undef NAME_MAX_FOR_STRUCT_DIRENT
# define NAME_MAX_FOR_STRUCT_DIRENT _XOPEN_NAME_MAX
# endif
# endif
# define DEFINE_STRUCT_DIRENT \
union { \
struct dirent dirent; \
char dummy[offsetof(struct dirent, d_name) + \
NAME_MAX_FOR_STRUCT_DIRENT + 1]; \
}
# define STRUCT_DIRENT(entry) ((entry).dirent)
#else
# define DEFINE_STRUCT_DIRENT struct dirent
# define STRUCT_DIRENT(entry) (entry)
#endif

/*
* call-seq:
* dir.read -> string or nil
*
* Reads the next entry from <em>dir</em> and returns it as a string.
* Returns <code>nil</code> at the end of the stream.
*
* d = Dir.new("testdir")
* d.read #=> "."
* d.read #=> ".."
* d.read #=> "config.h"
*/
static VALUE
dir_read(VALUE dir)
{
    struct dir_data *dirp;
    struct dirent *dp;
    IF_HAVE_READDIR_R(DEFINE_STRUCT_DIRENT entry);

    GetDIR(dir, dirp);
    errno = 0;
    if (READDIR(dirp->dir, dirp->enc, &STRUCT_DIRENT(entry), dp)) {
return rb_external_str_new_with_enc(dp->d_name, NAMLEN(dp), dirp->enc);
    }
    else {
if (errno != 0) rb_sys_fail(0);
return Qnil; /* end of stream */
    }
}

/*
* call-seq:
* dir.each { |filename| block } -> dir
* dir.each -> an_enumerator
*
* Calls the block once for each entry in this directory, passing the
* filename of each entry as a parameter to the block.
*
* If no block is given, an enumerator is returned instead.
*
* d = Dir.new("testdir")
* d.each {|x| puts "Got #{x}" }
*
* <em>produces:</em>
*
* Got .
* Got ..
* Got config.h
* Got main.rb
*/
static VALUE
dir_each(VALUE dir)
{
    struct dir_data *dirp;
    struct dirent *dp;
    IF_HAVE_READDIR_R(DEFINE_STRUCT_DIRENT entry);

    RETURN_ENUMERATOR(dir, 0, 0);
    GetDIR(dir, dirp);
    rewinddir(dirp->dir);
    while (READDIR(dirp->dir, dirp->enc, &STRUCT_DIRENT(entry), dp)) {
rb_yield(rb_external_str_new_with_enc(dp->d_name, NAMLEN(dp), dirp->enc));
if (dirp->dir == NULL) dir_closed();
    }
    return dir;
}

#ifdef HAVE_TELLDIR
/*
* call-seq:
* dir.pos -> integer
* dir.tell -> integer
*
* Returns the current position in <em>dir</em>. See also
* <code>Dir#seek</code>.
*
* d = Dir.new("testdir")
* d.tell #=> 0
* d.read #=> "."
* d.tell #=> 12
*/
static VALUE
dir_tell(VALUE dir)
{
    struct dir_data *dirp;
    long pos;

    GetDIR(dir, dirp);
    pos = telldir(dirp->dir);
    return rb_int2inum(pos);
}
#else
#define dir_tell rb_f_notimplement
#endif

#ifdef HAVE_SEEKDIR
/*
* call-seq:
* dir.seek( integer ) -> dir
*
* Seeks to a particular location in <em>dir</em>. <i>integer</i>
* must be a value returned by <code>Dir#tell</code>.
*
* d = Dir.new("testdir") #=> #<Dir:0x401b3c40>
* d.read #=> "."
* i = d.tell #=> 12
* d.read #=> ".."
* d.seek(i) #=> #<Dir:0x401b3c40>
* d.read #=> ".."
*/
static VALUE
dir_seek(VALUE dir, VALUE pos)
{
    struct dir_data *dirp;
    long p = NUM2LONG(pos);

    GetDIR(dir, dirp);
    seekdir(dirp->dir, p);
    return dir;
}
#else
#define dir_seek rb_f_notimplement
#endif

/*
* call-seq:
* dir.pos( integer ) -> integer
*
* Synonym for <code>Dir#seek</code>, but returns the position
* parameter.
*
* d = Dir.new("testdir") #=> #<Dir:0x401b3c40>
* d.read #=> "."
* i = d.pos #=> 12
* d.read #=> ".."
* d.pos = i #=> 12
* d.read #=> ".."
*/
static VALUE
dir_set_pos(VALUE dir, VALUE pos)
{
    dir_seek(dir, pos);
    return pos;
}

/*
* call-seq:
* dir.rewind -> dir
*
* Repositions <em>dir</em> to the first entry.
*
* d = Dir.new("testdir")
* d.read #=> "."
* d.rewind #=> #<Dir:0x401b3fb0>
* d.read #=> "."
*/
static VALUE
dir_rewind(VALUE dir)
{
    struct dir_data *dirp;

    if (rb_safe_level() >= 4 && !OBJ_UNTRUSTED(dir)) {
rb_raise(rb_eSecurityError, "Insecure: can't close");
    }
    GetDIR(dir, dirp);
    rewinddir(dirp->dir);
    return dir;
}

/*
* call-seq:
* dir.close -> nil
*
* Closes the directory stream. Any further attempts to access
* <em>dir</em> will raise an <code>IOError</code>.
*
* d = Dir.new("testdir")
* d.close #=> nil
*/
static VALUE
dir_close(VALUE dir)
{
    struct dir_data *dirp;

    GetDIR(dir, dirp);
    closedir(dirp->dir);
    dirp->dir = NULL;

    return Qnil;
}

static void
dir_chdir(VALUE path)
{
    if (chdir(RSTRING_PTR(path)) < 0)
rb_sys_fail_path(path);
}

static int chdir_blocking = 0;
static VALUE chdir_thread = Qnil;

struct chdir_data {
    VALUE old_path, new_path;
    int done;
};

static VALUE
chdir_yield(struct chdir_data *args)
{
    dir_chdir(args->new_path);
    args->done = TRUE;
    chdir_blocking++;
    if (chdir_thread == Qnil)
chdir_thread = rb_thread_current();
    return rb_yield(args->new_path);
}

static VALUE
chdir_restore(struct chdir_data *args)
{
    if (args->done) {
chdir_blocking--;
if (chdir_blocking == 0)
chdir_thread = Qnil;
dir_chdir(args->old_path);
    }
    return Qnil;
}

/*
* call-seq:
* Dir.chdir( [ string] ) -> 0
* Dir.chdir( [ string] ) {| path | block } -> anObject
*
* Changes the current working directory of the process to the given
* string. When called without an argument, changes the directory to
* the value of the environment variable <code>HOME</code>, or
* <code>LOGDIR</code>. <code>SystemCallError</code> (probably
* <code>Errno::ENOENT</code>) if the target directory does not exist.
*
* If a block is given, it is passed the name of the new current
* directory, and the block is executed with that as the current
* directory. The original working directory is restored when the block
* exits. The return value of <code>chdir</code> is the value of the
* block. <code>chdir</code> blocks can be nested, but in a
* multi-threaded program an error will be raised if a thread attempts
* to open a <code>chdir</code> block while another thread has one
* open.
*
* Dir.chdir("/var/spool/mail")
* puts Dir.pwd
* Dir.chdir("/tmp") do
* puts Dir.pwd
* Dir.chdir("/usr") do
* puts Dir.pwd
* end
* puts Dir.pwd
* end
* puts Dir.pwd
*
* <em>produces:</em>
*
* /var/spool/mail
* /tmp
* /usr
* /tmp
* /var/spool/mail
*/
static VALUE
dir_s_chdir(int argc, VALUE *argv, VALUE obj)
{
    VALUE path = Qnil;

    rb_secure(2);
    if (rb_scan_args(argc, argv, "01", &path) == 1) {
FilePathValue(path);
path = rb_str_encode_ospath(path);
    }
    else {
const char *dist = getenv("HOME");
if (!dist) {
dist = getenv("LOGDIR");
if (!dist) rb_raise(rb_eArgError, "HOME/LOGDIR not set");
}
path = rb_str_new2(dist);
    }

    if (chdir_blocking > 0) {
if (!rb_block_given_p() || rb_thread_current() != chdir_thread)
rb_warn("conflicting chdir during another chdir block");
    }

    if (rb_block_given_p()) {
struct chdir_data args;

args.old_path = rb_str_encode_ospath(rb_dir_getwd());
args.new_path = path;
args.done = FALSE;
return rb_ensure(chdir_yield, (VALUE)&args, chdir_restore, (VALUE)&args);
    }
    dir_chdir(path);

    return INT2FIX(0);
}

VALUE
rb_dir_getwd(void)
{
    char *path;
    VALUE cwd;

    rb_secure(4);
    path = my_getcwd();
    cwd = rb_tainted_str_new2(path);
    rb_enc_associate(cwd, rb_filesystem_encoding());

    xfree(path);
    return cwd;
}

/*
* call-seq:
* Dir.getwd -> string
* Dir.pwd -> string
*
* Returns the path to the current working directory of this process as
* a string.
*
* Dir.chdir("/tmp") #=> 0
* Dir.getwd #=> "/tmp"
*/
static VALUE
dir_s_getwd(VALUE dir)
{
    return rb_dir_getwd();
}

static void
check_dirname(volatile VALUE *dir)
{
    VALUE d = *dir;
    char *path, *pend;
    long len;
    rb_encoding *enc;

    rb_secure(2);
    FilePathValue(d);
    enc = rb_enc_get(d);
    RSTRING_GETMEM(d, path, len);
    pend = path + len;
    pend = rb_enc_path_end(rb_enc_path_skip_prefix(path, pend, enc), pend, enc);
    if (pend - path < len) {
d = rb_str_subseq(d, 0, pend - path);
    }
    *dir = rb_str_encode_ospath(d);
}

#if defined(HAVE_CHROOT)
/*
* call-seq:
* Dir.chroot( string ) -> 0
*
* Changes this process's idea of the file system root. Only a
* privileged process may make this call. Not available on all
* platforms. On Unix systems, see <code>chroot(2)</code> for more
* information.
*/
static VALUE
dir_s_chroot(VALUE dir, VALUE path)
{
    check_dirname(&path);
    if (chroot(RSTRING_PTR(path)) == -1)
rb_sys_fail_path(path);

    return INT2FIX(0);
}
#else
#define dir_s_chroot rb_f_notimplement
#endif

/*
* call-seq:
* Dir.mkdir( string [, integer] ) -> 0
*
* Makes a new directory named by <i>string</i>, with permissions
* specified by the optional parameter <i>anInteger</i>. The
* permissions may be modified by the value of
* <code>File::umask</code>, and are ignored on NT. Raises a
* <code>SystemCallError</code> if the directory cannot be created. See
* also the discussion of permissions in the class documentation for
* <code>File</code>.
*
* Dir.mkdir(File.join(Dir.home, ".foo"), 0700) #=> 0
*
*/
static VALUE
dir_s_mkdir(int argc, VALUE *argv, VALUE obj)
{
    VALUE path, vmode;
    int mode;

    if (rb_scan_args(argc, argv, "11", &path, &vmode) == 2) {
mode = NUM2INT(vmode);
    }
    else {
mode = 0777;
    }

    check_dirname(&path);
    if (mkdir(RSTRING_PTR(path), mode) == -1)
rb_sys_fail_path(path);

    return INT2FIX(0);
}

/*
* call-seq:
* Dir.delete( string ) -> 0
* Dir.rmdir( string ) -> 0
* Dir.unlink( string ) -> 0
*
* Deletes the named directory. Raises a subclass of
* <code>SystemCallError</code> if the directory isn't empty.
*/
static VALUE
dir_s_rmdir(VALUE obj, VALUE dir)
{
    check_dirname(&dir);
    if (rmdir(RSTRING_PTR(dir)) < 0)
rb_sys_fail_path(dir);

    return INT2FIX(0);
}

static VALUE
sys_warning_1(VALUE mesg)
{
    rb_sys_warning("%s:%s", strerror(errno), (const char *)mesg);
    return Qnil;
}

#define GLOB_VERBOSE (1U << (sizeof(int) * CHAR_BIT - 1))
#define sys_warning(val) \
(void)((flags & GLOB_VERBOSE) && rb_protect(sys_warning_1, (VALUE)(val), 0))

#define GLOB_ALLOC(type) ((type *)malloc(sizeof(type)))
#define GLOB_ALLOC_N(type, n) ((type *)malloc(sizeof(type) * (n)))
#define GLOB_FREE(ptr) free(ptr)
#define GLOB_JUMP_TAG(status) (((status) == -1) ? rb_memerror() : rb_jump_tag(status))

/*
* ENOTDIR can be returned by stat(2) if a non-leaf element of the path
* is not a directory.
*/
#define to_be_ignored(e) ((e) == ENOENT || (e) == ENOTDIR)

/* System call with warning */
static int
do_stat(const char *path, struct stat *pst, int flags)

{
    int ret = stat(path, pst);
    if (ret < 0 && !to_be_ignored(errno))
sys_warning(path);

    return ret;
}

static int
do_lstat(const char *path, struct stat *pst, int flags)
{
    int ret = lstat(path, pst);
    if (ret < 0 && !to_be_ignored(errno))
sys_warning(path);

    return ret;
}

static DIR *
do_opendir(const char *path, int flags, rb_encoding *enc)
{
    DIR *dirp;
#ifdef _WIN32
    volatile VALUE tmp;
    if (enc != rb_usascii_encoding() &&
enc != rb_ascii8bit_encoding() &&
enc != rb_utf8_encoding()) {
tmp = rb_enc_str_new(path, strlen(path), enc);
tmp = rb_str_encode_ospath(tmp);
path = RSTRING_PTR(tmp);
    }
#endif
    dirp = opendir(path);
    if (dirp == NULL && !to_be_ignored(errno))
sys_warning(path);

    return dirp;
}

/* Return nonzero if S has any special globbing chars in it. */
static int
has_magic(const char *p, const char *pend, int flags, rb_encoding *enc)
{
    const int escape = !(flags & FNM_NOESCAPE);
    const int nocase = flags & FNM_CASEFOLD;

    register char c;

    while (p < pend && (c = *p++) != 0) {
switch (c) {
case '*':
case '?':
case '[':
return 1;

case '\\':
if (escape && !(c = *p++))
return 0;
continue;

default:
if (!FNM_SYSCASE && ISALPHA(c) && nocase)
return 1;
}

p = Next(p-1, pend, enc);
    }

    return 0;
}

/* Find separator in globbing pattern. */
static char *
find_dirsep(const char *p, const char *pend, int flags, rb_encoding *enc)
{
    const int escape = !(flags & FNM_NOESCAPE);

    register char c;
    int open = 0;

    while ((c = *p++) != 0) {
switch (c) {
case '[':
open = 1;
continue;
case ']':
open = 0;
continue;

case '/':
if (!open)
return (char *)p-1;
continue;

case '\\':
if (escape && !(c = *p++))
return (char *)p-1;
continue;
}

p = Next(p-1, pend, enc);
    }

    return (char *)p-1;
}

/* Remove escaping backslashes */
static void
remove_backslashes(char *p, rb_encoding *enc)
{
    register const char *pend = p + strlen(p);
    char *t = p;
    char *s = p;

    while (*p) {
if (*p == '\\') {
if (t != s)
memmove(t, s, p - s);
t += p - s;
s = ++p;
if (!*p) break;
}
Inc(p, pend, enc);
    }

    while (*p++);

    if (t != s)
memmove(t, s, p - s); /* move '\0' too */
}

/* Globing pattern */
enum glob_pattern_type { PLAIN, MAGICAL, RECURSIVE, MATCH_ALL, MATCH_DIR };

struct glob_pattern {
    char *str;
    enum glob_pattern_type type;
    struct glob_pattern *next;
};

static void glob_free_pattern(struct glob_pattern *list);

static struct glob_pattern *
glob_make_pattern(const char *p, const char *e, int flags, rb_encoding *enc)
{
    struct glob_pattern *list, *tmp, **tail = &list;
    int dirsep = 0; /* pattern is terminated with '/' */

    while (p < e && *p) {
tmp = GLOB_ALLOC(struct glob_pattern);
if (!tmp) goto error;
if (p[0] == '*' && p[1] == '*' && p[2] == '/') {
/* fold continuous RECURSIVEs (needed in glob_helper) */
do { p += 3; while (*p == '/') p++; } while (p[0] == '*' && p[1] == '*' && p[2] == '/');
tmp->type = RECURSIVE;
tmp->str = 0;
dirsep = 1;
}
else {
const char *m = find_dirsep(p, e, flags, enc);
int magic = has_magic(p, m, flags, enc);
char *buf;

if (!magic && *m) {
const char *m2;
while (!has_magic(m+1, m2 = find_dirsep(m+1, e, flags, enc), flags, enc) &&
*m2) {
m = m2;
}
}
buf = GLOB_ALLOC_N(char, m-p+1);
if (!buf) {
GLOB_FREE(tmp);
goto error;
}
memcpy(buf, p, m-p);
buf[m-p] = '\0';
tmp->type = magic ? MAGICAL : PLAIN;
tmp->str = buf;
if (*m) {
dirsep = 1;
p = m + 1;
}
else {
dirsep = 0;
p = m;
}
}
*tail = tmp;
tail = &tmp->next;
    }

    tmp = GLOB_ALLOC(struct glob_pattern);
    if (!tmp) {
      error:
*tail = 0;
glob_free_pattern(list);
return 0;
    }
    tmp->type = dirsep ? MATCH_DIR : MATCH_ALL;
    tmp->str = 0;
    *tail = tmp;
    tmp->next = 0;

    return list;
}

static void
glob_free_pattern(struct glob_pattern *list)
{
    while (list) {
struct glob_pattern *tmp = list;
list = list->next;
if (tmp->str)
GLOB_FREE(tmp->str);
GLOB_FREE(tmp);
    }
}

static char *
join_path(const char *path, int dirsep, const char *name)
{
    long len = strlen(path);
    long len2 = strlen(name)+(dirsep?1:0)+1;
    char *buf = GLOB_ALLOC_N(char, len+len2);

    if (!buf) return 0;
    memcpy(buf, path, len);
    if (dirsep) {
buf[len++] = '/';
    }
    buf[len] = '\0';
    strlcat(buf+len, name, len2);
    return buf;
}

enum answer { YES, NO, UNKNOWN };

#ifndef S_ISDIR
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

#ifndef S_ISLNK
# ifndef S_IFLNK
# define S_ISLNK(m) (0)
# else
# define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
# endif
#endif

struct glob_args {
    void (*func)(const char *, VALUE, void *);
    const char *path;
    VALUE value;
    rb_encoding *enc;
};

static VALUE
glob_func_caller(VALUE val)
{
    struct glob_args *args = (struct glob_args *)val;

    (*args->func)(args->path, args->value, args->enc);
    return Qnil;
}

#define glob_call_func(func, path, arg, enc) (*(func))((path), (arg), (enc))

static int
glob_helper(
    const char *path,
    int dirsep, /* '/' should be placed before appending child entry's name to 'path'. */
    enum answer exist, /* Does 'path' indicate an existing entry? */
    enum answer isdir, /* Does 'path' indicate a directory or a symlink to a directory? */
    struct glob_pattern **beg,
    struct glob_pattern **end,
    int flags,
    ruby_glob_func *func,
    VALUE arg,
    rb_encoding *enc)
{
    struct stat st;
    int status = 0;
    struct glob_pattern **cur, **new_beg, **new_end;
    int plain = 0, magical = 0, recursive = 0, match_all = 0, match_dir = 0;
    int escape = !(flags & FNM_NOESCAPE);

    for (cur = beg; cur < end; ++cur) {
struct glob_pattern *p = *cur;
if (p->type == RECURSIVE) {
recursive = 1;
p = p->next;
}
switch (p->type) {
case PLAIN:
plain = 1;
break;
case MAGICAL:
magical = 1;
break;
case MATCH_ALL:
match_all = 1;
break;
case MATCH_DIR:
match_dir = 1;
break;
case RECURSIVE:
rb_bug("continuous RECURSIVEs");
}
    }

    if (*path) {
if (match_all && exist == UNKNOWN) {
if (do_lstat(path, &st, flags) == 0) {
exist = YES;
isdir = S_ISDIR(st.st_mode) ? YES : S_ISLNK(st.st_mode) ? UNKNOWN : NO;
}
else {
exist = NO;
isdir = NO;
}
}
if (match_dir && isdir == UNKNOWN) {
if (do_stat(path, &st, flags) == 0) {
exist = YES;
isdir = S_ISDIR(st.st_mode) ? YES : NO;
}
else {
exist = NO;
isdir = NO;
}
}
if (match_all && exist == YES) {
status = glob_call_func(func, path, arg, enc);
if (status) return status;
}
if (match_dir && isdir == YES) {
char *tmp = join_path(path, dirsep, "");
if (!tmp) return -1;
status = glob_call_func(func, tmp, arg, enc);
GLOB_FREE(tmp);
if (status) return status;
}
    }

    if (exist == NO || isdir == NO) return 0;

    if (magical || recursive) {
struct dirent *dp;
DIR *dirp;
IF_HAVE_READDIR_R(DEFINE_STRUCT_DIRENT entry);
dirp = do_opendir(*path ? path : ".", flags, enc);
if (dirp == NULL) return 0;

while (READDIR(dirp, enc, &STRUCT_DIRENT(entry), dp)) {
char *buf = join_path(path, dirsep, dp->d_name);
enum answer new_isdir = UNKNOWN;

if (!buf) {
status = -1;
break;
}
if (recursive && strcmp(dp->d_name, ".") != 0 && strcmp(dp->d_name, "..") != 0
&& fnmatch("*", rb_usascii_encoding(), dp->d_name, flags) == 0) {
#ifndef _WIN32
if (do_lstat(buf, &st, flags) == 0)
new_isdir = S_ISDIR(st.st_mode) ? YES : S_ISLNK(st.st_mode) ? UNKNOWN : NO;
else
new_isdir = NO;
#else
new_isdir = dp->d_isdir ? (!dp->d_isrep ? YES : UNKNOWN) : NO;
#endif
}

new_beg = new_end = GLOB_ALLOC_N(struct glob_pattern *, (end - beg) * 2);
if (!new_beg) {
GLOB_FREE(buf);
status = -1;
break;
}

for (cur = beg; cur < end; ++cur) {
struct glob_pattern *p = *cur;
if (p->type == RECURSIVE) {
if (new_isdir == YES) /* not symlink but real directory */
*new_end++ = p; /* append recursive pattern */
p = p->next; /* 0 times recursion */
}
if (p->type == PLAIN || p->type == MAGICAL) {
if (fnmatch(p->str, enc, dp->d_name, flags) == 0)
*new_end++ = p->next;
}
}

status = glob_helper(buf, 1, YES, new_isdir, new_beg, new_end,
flags, func, arg, enc);
GLOB_FREE(buf);
GLOB_FREE(new_beg);
if (status) break;
}

closedir(dirp);
    }
    else if (plain) {
struct glob_pattern **copy_beg, **copy_end, **cur2;

copy_beg = copy_end = GLOB_ALLOC_N(struct glob_pattern *, end - beg);
if (!copy_beg) return -1;
for (cur = beg; cur < end; ++cur)
*copy_end++ = (*cur)->type == PLAIN ? *cur : 0;

for (cur = copy_beg; cur < copy_end; ++cur) {
if (*cur) {
char *buf;
char *name;
size_t len = strlen((*cur)->str) + 1;
name = GLOB_ALLOC_N(char, len);
if (!name) {
status = -1;
break;
}
memcpy(name, (*cur)->str, len);
if (escape) remove_backslashes(name, enc);

new_beg = new_end = GLOB_ALLOC_N(struct glob_pattern *, end - beg);
if (!new_beg) {
GLOB_FREE(name);
status = -1;
break;
}
*new_end++ = (*cur)->next;
for (cur2 = cur + 1; cur2 < copy_end; ++cur2) {
if (*cur2 && fnmatch((*cur2)->str, enc, name, flags) == 0) {
*new_end++ = (*cur2)->next;
*cur2 = 0;
}
}

buf = join_path(path, dirsep, name);
GLOB_FREE(name);
if (!buf) {
GLOB_FREE(new_beg);
status = -1;
break;
}
status = glob_helper(buf, 1, UNKNOWN, UNKNOWN, new_beg,
new_end, flags, func, arg, enc);
GLOB_FREE(buf);
GLOB_FREE(new_beg);
if (status) break;
}
}

GLOB_FREE(copy_beg);
    }

    return status;
}

static int
ruby_glob0(const char *path, int flags, ruby_glob_func *func, VALUE arg, rb_encoding *enc)
{
    struct glob_pattern *list;
    const char *root, *start;
    char *buf;
    size_t n;
    int status;

    start = root = path;
    flags |= FNM_SYSCASE;
#if defined DOSISH
    root = rb_enc_path_skip_prefix(root, root + strlen(root), enc);
#endif

    if (root && *root == '/') root++;

    n = root - start;
    buf = GLOB_ALLOC_N(char, n + 1);
    if (!buf) return -1;
    MEMCPY(buf, start, char, n);
    buf[n] = '\0';

    list = glob_make_pattern(root, root + strlen(root), flags, enc);
    if (!list) {
GLOB_FREE(buf);
return -1;
    }
    status = glob_helper(buf, 0, UNKNOWN, UNKNOWN, &list, &list + 1, flags, func, arg, enc);
    glob_free_pattern(list);
    GLOB_FREE(buf);

    return status;
}

int
ruby_glob(const char *path, int flags, ruby_glob_func *func, VALUE arg)
{
    return ruby_glob0(path, flags & ~GLOB_VERBOSE, func, arg,
rb_ascii8bit_encoding());
}

static int
rb_glob_caller(const char *path, VALUE a, void *enc)
{
    int status;
    struct glob_args *args = (struct glob_args *)a;

    args->path = path;
    rb_protect(glob_func_caller, a, &status);
    return status;
}

static int
rb_glob2(const char *path, int flags,
void (*func)(const char *, VALUE, void *), VALUE arg,
rb_encoding* enc)
{
    struct glob_args args;

    args.func = func;
    args.value = arg;
    args.enc = enc;

    if (flags & FNM_SYSCASE) {
rb_warning("Dir.glob() ignores File::FNM_CASEFOLD");
    }

    return ruby_glob0(path, flags | GLOB_VERBOSE, rb_glob_caller, (VALUE)&args,
enc);
}

void
rb_glob(const char *path, void (*func)(const char *, VALUE, void *), VALUE arg)
{
    int status = rb_glob2(path, 0, func, arg, rb_ascii8bit_encoding());
    if (status) GLOB_JUMP_TAG(status);
}

static void
push_pattern(const char *path, VALUE ary, void *enc)
{
    rb_ary_push(ary, rb_external_str_new_with_enc(path, strlen(path), enc));
}

static int
ruby_brace_expand(const char *str, int flags, ruby_glob_func *func, VALUE arg,
rb_encoding *enc)
{
    const int escape = !(flags & FNM_NOESCAPE);
    const char *p = str;
    const char *pend = p + strlen(p);
    const char *s = p;
    const char *lbrace = 0, *rbrace = 0;
    int nest = 0, status = 0;

    while (*p) {
if (*p == '{' && nest++ == 0) {
lbrace = p;
}
if (*p == '}' && --nest <= 0) {
rbrace = p;
break;
}
if (*p == '\\' && escape) {
if (!*++p) break;
}
Inc(p, pend, enc);
    }

    if (lbrace && rbrace) {
size_t len = strlen(s) + 1;
char *buf = GLOB_ALLOC_N(char, len);
long shift;

if (!buf) return -1;
memcpy(buf, s, lbrace-s);
shift = (lbrace-s);
p = lbrace;
while (p < rbrace) {
const char *t = ++p;
nest = 0;
while (p < rbrace && !(*p == ',' && nest == 0)) {
if (*p == '{') nest++;
if (*p == '}') nest--;
if (*p == '\\' && escape) {
if (++p == rbrace) break;
}
Inc(p, pend, enc);
}
memcpy(buf+shift, t, p-t);
strlcpy(buf+shift+(p-t), rbrace+1, len-(shift+(p-t)));
status = ruby_brace_expand(buf, flags, func, arg, enc);
if (status) break;
}
GLOB_FREE(buf);
    }
    else if (!lbrace && !rbrace) {
status = (*func)(s, arg, enc);
    }

    return status;
}

struct brace_args {
    ruby_glob_func *func;
    VALUE value;
    int flags;
};

static int
glob_brace(const char *path, VALUE val, void *enc)
{
    struct brace_args *arg = (struct brace_args *)val;

    return ruby_glob0(path, arg->flags, arg->func, arg->value, enc);
}

static int
ruby_brace_glob0(const char *str, int flags, ruby_glob_func *func, VALUE arg,
rb_encoding* enc)
{
    struct brace_args args;

    args.func = func;
    args.value = arg;
    args.flags = flags;
    return ruby_brace_expand(str, flags, glob_brace, (VALUE)&args, enc);
}

int
ruby_brace_glob(const char *str, int flags, ruby_glob_func *func, VALUE arg)
{
    return ruby_brace_glob0(str, flags & ~GLOB_VERBOSE, func, arg,
rb_ascii8bit_encoding());
}

int
ruby_brace_glob_with_enc(const char *str, int flags, ruby_glob_func *func, VALUE arg, rb_encoding *enc)
{
    return ruby_brace_glob0(str, flags & ~GLOB_VERBOSE, func, arg, enc);
}

static int
push_glob(VALUE ary, VALUE str, int flags)
{
    struct glob_args args;
    rb_encoding *enc = rb_enc_get(str);

    if (enc == rb_usascii_encoding()) enc = rb_filesystem_encoding();
    args.func = push_pattern;
    args.value = ary;
    args.enc = enc;

    RB_GC_GUARD(str);
    return ruby_brace_glob0(RSTRING_PTR(str), flags | GLOB_VERBOSE,
rb_glob_caller, (VALUE)&args, enc);
}

static VALUE
rb_push_glob(VALUE str, int flags) /* '\0' is delimiter */
{
    long offset = 0;
    VALUE ary;

    GlobPathValue(str, TRUE);
    ary = rb_ary_new();

    while (offset < RSTRING_LEN(str)) {
char *p, *pend;
int status;
p = RSTRING_PTR(str) + offset;
status = push_glob(ary, rb_enc_str_new(p, strlen(p), rb_enc_get(str)),
flags);
if (status) GLOB_JUMP_TAG(status);
if (offset >= RSTRING_LEN(str)) break;
p += strlen(p) + 1;
pend = RSTRING_PTR(str) + RSTRING_LEN(str);
while (p < pend && !*p)
p++;
offset = p - RSTRING_PTR(str);
    }

    return ary;
}

static VALUE
dir_globs(long argc, VALUE *argv, int flags)
{
    VALUE ary = rb_ary_new();
    long i;

    for (i = 0; i < argc; ++i) {
int status;
VALUE str = argv[i];
GlobPathValue(str, TRUE);
status = push_glob(ary, str, flags);
if (status) GLOB_JUMP_TAG(status);
    }

    return ary;
}

/*
* call-seq:
* Dir[ array ] -> array
* Dir[ string [, string ...] ] -> array
*
* Equivalent to calling
* <code>Dir.glob(</code><i>array,</i><code>0)</code> and
* <code>Dir.glob([</code><i>string,...</i><code>],0)</code>.
*
*/
static VALUE
dir_s_aref(int argc, VALUE *argv, VALUE obj)
{
    if (argc == 1) {
return rb_push_glob(argv[0], 0);
    }
    return dir_globs(argc, argv, 0);
}

/*
* call-seq:
* Dir.glob( pattern, [flags] ) -> array
* Dir.glob( pattern, [flags] ) {| filename | block } -> nil
*
* Returns the filenames found by expanding <i>pattern</i> which is
* an +Array+ of the patterns or the pattern +String+, either as an
* <i>array</i> or as parameters to the block. Note that this pattern
* is not a regexp (it's closer to a shell glob). See
* <code>File::fnmatch</code> for the meaning of the <i>flags</i>
* parameter. Note that case sensitivity depends on your system (so
* <code>File::FNM_CASEFOLD</code> is ignored), as does the order
* in which the results are returned.
*
* <code>*</code>:: Matches any file. Can be restricted by
* other values in the glob. <code>*</code>
* will match all files; <code>c*</code> will
* match all files beginning with
* <code>c</code>; <code>*c</code> will match
* all files ending with <code>c</code>; and
* <code>\*c\*</code> will match all files that
* have <code>c</code> in them (including at
* the beginning or end). Equivalent to
* <code>/ .* /x</code> in regexp. Note, this
* will not match Unix-like hidden files (dotfiles).
* In order to include those in the match results,
* you must use something like "{*,.*}".
* <code>**</code>:: Matches directories recursively.
* <code>?</code>:: Matches any one character. Equivalent to
* <code>/.{1}/</code> in regexp.
* <code>[set]</code>:: Matches any one character in +set+.
* Behaves exactly like character sets in
* Regexp, including set negation
* (<code>[^a-z]</code>).
* <code>{p,q}</code>:: Matches either literal <code>p</code> or
* literal <code>q</code>. Matching literals
* may be more than one character in length.
* More than two literals may be specified.
* Equivalent to pattern alternation in
* regexp.
* <code> \ </code>:: Escapes the next metacharacter.
* Note that this means you cannot use backslash in windows
* as part of a glob, i.e. Dir["c:\\foo*"] will not work
* use Dir["c:/foo*"] instead
*
* Dir["config.?"] #=> ["config.h"]
* Dir.glob("config.?") #=> ["config.h"]
* Dir.glob("*.[a-z][a-z]") #=> ["main.rb"]
* Dir.glob("*.[^r]*") #=> ["config.h"]
* Dir.glob("*.{rb,h}") #=> ["main.rb", "config.h"]
* Dir.glob("*") #=> ["config.h", "main.rb"]
* Dir.glob("*", File::FNM_DOTMATCH) #=> [".", "..", "config.h", "main.rb"]
*
* rbfiles = File.join("**", "*.rb")
* Dir.glob(rbfiles) #=> ["main.rb",
* # "lib/song.rb",
* # "lib/song/karaoke.rb"]
* libdirs = File.join("**", "lib")
* Dir.glob(libdirs) #=> ["lib"]
*
* librbfiles = File.join("**", "lib", "**", "*.rb")
* Dir.glob(librbfiles) #=> ["lib/song.rb",
* # "lib/song/karaoke.rb"]
*
* librbfiles = File.join("**", "lib", "*.rb")
* Dir.glob(librbfiles) #=> ["lib/song.rb"]
*/
static VALUE
dir_s_glob(int argc, VALUE *argv, VALUE obj)
{
    VALUE str, rflags, ary;
    int flags;

    if (rb_scan_args(argc, argv, "11", &str, &rflags) == 2)
flags = NUM2INT(rflags);
    else
flags = 0;

    ary = rb_check_array_type(str);
    if (NIL_P(ary)) {
ary = rb_push_glob(str, flags);
    }
    else {
volatile VALUE v = ary;
ary = dir_globs(RARRAY_LEN(v), RARRAY_PTR(v), flags);
    }

    if (rb_block_given_p()) {
rb_ary_each(ary);
return Qnil;
    }
    return ary;
}

static VALUE
dir_open_dir(int argc, VALUE *argv)
{
    VALUE dir = rb_funcall2(rb_cDir, rb_intern("open"), argc, argv);

    rb_check_typeddata(dir, &dir_data_type);
    return dir;
}


/*
* call-seq:
* Dir.foreach( dirname ) {| filename | block } -> nil
* Dir.foreach( dirname ) -> an_enumerator
*
* Calls the block once for each entry in the named directory, passing
* the filename of each entry as a parameter to the block.
*
* If no block is given, an enumerator is returned instead.
*
* Dir.foreach("testdir") {|x| puts "Got #{x}" }
*
* <em>produces:</em>
*
* Got .
* Got ..
* Got config.h
* Got main.rb
*
*/
static VALUE
dir_foreach(int argc, VALUE *argv, VALUE io)
{
    VALUE dir;

    RETURN_ENUMERATOR(io, argc, argv);
    dir = dir_open_dir(argc, argv);
    rb_ensure(dir_each, dir, dir_close, dir);
    return Qnil;
}

/*
* call-seq:
* Dir.entries( dirname ) -> array
*
* Returns an array containing all of the filenames in the given
* directory. Will raise a <code>SystemCallError</code> if the named
* directory doesn't exist.
*
* Dir.entries("testdir") #=> [".", "..", "config.h", "main.rb"]
*
*/
static VALUE
dir_entries(int argc, VALUE *argv, VALUE io)
{
    VALUE dir;

    dir = dir_open_dir(argc, argv);
    return rb_ensure(rb_Array, dir, dir_close, dir);
}

/*
* call-seq:
* File.fnmatch( pattern, path, [flags] ) -> (true or false)
* File.fnmatch?( pattern, path, [flags] ) -> (true or false)
*
* Returns true if <i>path</i> matches against <i>pattern</i> The
* pattern is not a regular expression; instead it follows rules
* similar to shell filename globbing. It may contain the following
* metacharacters:
*
* <code>*</code>:: Matches any file. Can be restricted by
* other values in the glob. <code>*</code>
* will match all files; <code>c*</code> will
* match all files beginning with
* <code>c</code>; <code>*c</code> will match
* all files ending with <code>c</code>; and
* <code>\*c*</code> will match all files that
* have <code>c</code> in them (including at
* the beginning or end). Equivalent to
* <code>/ .* /x</code> in regexp.
* <code>**</code>:: Matches directories recursively or files
* expansively.
* <code>?</code>:: Matches any one character. Equivalent to
* <code>/.{1}/</code> in regexp.
* <code>[set]</code>:: Matches any one character in +set+.
* Behaves exactly like character sets in
* Regexp, including set negation
* (<code>[^a-z]</code>).
* <code> \ </code>:: Escapes the next metacharacter.
*
* <i>flags</i> is a bitwise OR of the <code>FNM_xxx</code>
* parameters. The same glob pattern and flags are used by
* <code>Dir::glob</code>.
*
* File.fnmatch('cat', 'cat') #=> true # match entire string
* File.fnmatch('cat', 'category') #=> false # only match partial string
* File.fnmatch('c{at,ub}s', 'cats') #=> false # { } isn't supported
*
* File.fnmatch('c?t', 'cat') #=> true # '?' match only 1 character
* File.fnmatch('c??t', 'cat') #=> false # ditto
* File.fnmatch('c*', 'cats') #=> true # '*' match 0 or more characters
* File.fnmatch('c*t', 'c/a/b/t') #=> true # ditto
* File.fnmatch('ca[a-z]', 'cat') #=> true # inclusive bracket expression
* File.fnmatch('ca[^t]', 'cat') #=> false # exclusive bracket expression ('^' or '!')
*
* File.fnmatch('cat', 'CAT') #=> false # case sensitive
* File.fnmatch('cat', 'CAT', File::FNM_CASEFOLD) #=> true # case insensitive
*
* File.fnmatch('?', '/', File::FNM_PATHNAME) #=> false # wildcard doesn't match '/' on FNM_PATHNAME
* File.fnmatch('*', '/', File::FNM_PATHNAME) #=> false # ditto
* File.fnmatch('[/]', '/', File::FNM_PATHNAME) #=> false # ditto
*
* File.fnmatch('\?', '?') #=> true # escaped wildcard becomes ordinary
* File.fnmatch('\a', 'a') #=> true # escaped ordinary remains ordinary
* File.fnmatch('\a', '\a', File::FNM_NOESCAPE) #=> true # FNM_NOESACPE makes '\' ordinary
* File.fnmatch('[\?]', '?') #=> true # can escape inside bracket expression
*
* File.fnmatch('*', '.profile') #=> false # wildcard doesn't match leading
* File.fnmatch('*', '.profile', File::FNM_DOTMATCH) #=> true # period by default.
* File.fnmatch('.*', '.profile') #=> true
*
* rbfiles = '**' '/' '*.rb' # you don't have to do like this. just write in single string.
* File.fnmatch(rbfiles, 'main.rb') #=> false
* File.fnmatch(rbfiles, './main.rb') #=> false
* File.fnmatch(rbfiles, 'lib/song.rb') #=> true
* File.fnmatch('**.rb', 'main.rb') #=> true
* File.fnmatch('**.rb', './main.rb') #=> false
* File.fnmatch('**.rb', 'lib/song.rb') #=> true
* File.fnmatch('*', 'dave/.profile') #=> true
*
* pattern = '*' '/' '*'
* File.fnmatch(pattern, 'dave/.profile', File::FNM_PATHNAME) #=> false
* File.fnmatch(pattern, 'dave/.profile', File::FNM_PATHNAME | File::FNM_DOTMATCH) #=> true
*
* pattern = '**' '/' 'foo'
* File.fnmatch(pattern, 'a/b/c/foo', File::FNM_PATHNAME) #=> true
* File.fnmatch(pattern, '/a/b/c/foo', File::FNM_PATHNAME) #=> true
* File.fnmatch(pattern, 'c:/a/b/c/foo', File::FNM_PATHNAME) #=> true
* File.fnmatch(pattern, 'a/.b/c/foo', File::FNM_PATHNAME) #=> false
* File.fnmatch(pattern, 'a/.b/c/foo', File::FNM_PATHNAME | File::FNM_DOTMATCH) #=> true
*/
static VALUE
file_s_fnmatch(int argc, VALUE *argv, VALUE obj)
{
    VALUE pattern, path;
    VALUE rflags;
    int flags;

    if (rb_scan_args(argc, argv, "21", &pattern, &path, &rflags) == 3)
flags = NUM2INT(rflags);
    else
flags = 0;

    StringValue(pattern);
    FilePathStringValue(path);

    if (fnmatch(RSTRING_PTR(pattern), rb_enc_get(pattern), RSTRING_PTR(path),
flags) == 0)
return Qtrue;

    return Qfalse;
}

/*
* call-seq:
* Dir.home() -> "/home/me"
* Dir.home("root") -> "/root"
*
* Returns the home directory of the current user or the named user
* if given.
*/
static VALUE
dir_s_home(int argc, VALUE *argv, VALUE obj)
{
    VALUE user;
    const char *u = 0;

    rb_scan_args(argc, argv, "01", &user);
    if (!NIL_P(user)) {
SafeStringValue(user);
u = StringValueCStr(user);
    }
    return rb_home_dir(u, rb_str_new(0, 0));
}

#if 0
/*
* 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.
*
*/
VALUE
rb_file_directory_p()
{
}
#endif

/*
* Objects of class <code>Dir</code> are directory streams representing
* directories in the underlying file system. They provide a variety of
* ways to list directories and their contents. See also
* <code>File</code>.
*
* The directory used in these examples contains the two regular files
* (<code>config.h</code> and <code>main.rb</code>), the parent
* directory (<code>..</code>), and the directory itself
* (<code>.</code>).
*/
void
Init_Dir(void)
{
    rb_cDir = rb_define_class("Dir", rb_cObject);

    rb_include_module(rb_cDir, rb_mEnumerable);

    rb_define_alloc_func(rb_cDir, dir_s_alloc);
    rb_define_singleton_method(rb_cDir, "open", dir_s_open, -1);
    rb_define_singleton_method(rb_cDir, "foreach", dir_foreach, -1);
    rb_define_singleton_method(rb_cDir, "entries", dir_entries, -1);

    rb_define_method(rb_cDir,"initialize", dir_initialize, -1);
    rb_define_method(rb_cDir,"path", dir_path, 0);
    rb_define_method(rb_cDir,"to_path", dir_path, 0);
    rb_define_method(rb_cDir,"inspect", dir_inspect, 0);
    rb_define_method(rb_cDir,"read", dir_read, 0);
    rb_define_method(rb_cDir,"each", dir_each, 0);
    rb_define_method(rb_cDir,"rewind", dir_rewind, 0);
    rb_define_method(rb_cDir,"tell", dir_tell, 0);
    rb_define_method(rb_cDir,"seek", dir_seek, 1);
    rb_define_method(rb_cDir,"pos", dir_tell, 0);
    rb_define_method(rb_cDir,"pos=", dir_set_pos, 1);
    rb_define_method(rb_cDir,"close", dir_close, 0);

    rb_define_singleton_method(rb_cDir,"chdir", dir_s_chdir, -1);
    rb_define_singleton_method(rb_cDir,"getwd", dir_s_getwd, 0);
    rb_define_singleton_method(rb_cDir,"pwd", dir_s_getwd, 0);
    rb_define_singleton_method(rb_cDir,"chroot", dir_s_chroot, 1);
    rb_define_singleton_method(rb_cDir,"mkdir", dir_s_mkdir, -1);
    rb_define_singleton_method(rb_cDir,"rmdir", dir_s_rmdir, 1);
    rb_define_singleton_method(rb_cDir,"delete", dir_s_rmdir, 1);
    rb_define_singleton_method(rb_cDir,"unlink", dir_s_rmdir, 1);
    rb_define_singleton_method(rb_cDir,"home", dir_s_home, -1);

    rb_define_singleton_method(rb_cDir,"glob", dir_s_glob, -1);
    rb_define_singleton_method(rb_cDir,"[]", dir_s_aref, -1);
    rb_define_singleton_method(rb_cDir,"exist?", rb_file_directory_p, 1);
    rb_define_singleton_method(rb_cDir,"exists?", rb_file_directory_p, 1);

    rb_define_singleton_method(rb_cFile,"fnmatch", file_s_fnmatch, -1);
    rb_define_singleton_method(rb_cFile,"fnmatch?", file_s_fnmatch, -1);

    rb_file_const("FNM_NOESCAPE", INT2FIX(FNM_NOESCAPE));
    rb_file_const("FNM_PATHNAME", INT2FIX(FNM_PATHNAME));
    rb_file_const("FNM_DOTMATCH", INT2FIX(FNM_DOTMATCH));
    rb_file_const("FNM_CASEFOLD", INT2FIX(FNM_CASEFOLD));
    rb_file_const("FNM_SYSCASE", INT2FIX(FNM_SYSCASE));
}
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