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dir.c
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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/internal/config.h"
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef O_CLOEXEC
# define O_CLOEXEC 0
#endif
#ifndef USE_OPENDIR_AT
# if defined(HAVE_FDOPENDIR) && defined(HAVE_DIRFD) && \
defined(HAVE_OPENAT) && defined(HAVE_FSTATAT)
# define USE_OPENDIR_AT 1
# else
# define USE_OPENDIR_AT 0
# endif
#endif
#if USE_OPENDIR_AT
# include <fcntl.h>
#endif
#undef HAVE_DIRENT_NAMLEN
#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
# define HAVE_DIRENT_NAMLEN 1
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
# include <ndir.h>
# endif
# ifdef _WIN32
# include "win32/dir.h"
# endif
#endif
#ifndef HAVE_STDLIB_H
char *getenv();
#endif
#ifndef HAVE_STRING_H
char *strchr(char*,char);
#endif
#ifdef HAVE_SYS_ATTR_H
#include <sys/attr.h>
#endif
#define USE_NAME_ON_FS_REAL_BASENAME 1 /* platform dependent APIs to
* get real basenames */
#define USE_NAME_ON_FS_BY_FNMATCH 2 /* select the matching
* basename by fnmatch */
#ifdef HAVE_GETATTRLIST
# define USE_NAME_ON_FS USE_NAME_ON_FS_REAL_BASENAME
# define RUP32(size) ((size)+3/4)
# define SIZEUP32(type) RUP32(sizeof(type))
#elif defined _WIN32
# define USE_NAME_ON_FS USE_NAME_ON_FS_REAL_BASENAME
#elif defined DOSISH
# define USE_NAME_ON_FS USE_NAME_ON_FS_BY_FNMATCH
#else
# define USE_NAME_ON_FS 0
#endif
#ifdef __APPLE__
# define NORMALIZE_UTF8PATH 1
# include <sys/param.h>
# include <sys/mount.h>
# include <sys/vnode.h>
#else
# define NORMALIZE_UTF8PATH 0
#endif
#include "encindex.h"
#include "id.h"
#include "internal.h"
#include "internal/array.h"
#include "internal/dir.h"
#include "internal/encoding.h"
#include "internal/error.h"
#include "internal/file.h"
#include "internal/gc.h"
#include "internal/io.h"
#include "internal/object.h"
#include "internal/vm.h"
#include "ruby/encoding.h"
#include "ruby/ruby.h"
#include "ruby/thread.h"
#include "ruby/util.h"
#include "builtin.h"
#ifndef AT_FDCWD
# define AT_FDCWD -1
#endif
#define vm_initialized rb_cThread
/* 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)
# define ruby_getcwd() rb_w32_ugetcwd(NULL, 0)
# define IS_WIN32 1
#else
# define IS_WIN32 0
#endif
#if NORMALIZE_UTF8PATH
# if defined HAVE_FGETATTRLIST || !defined HAVE_GETATTRLIST
# define need_normalization(dirp, path) need_normalization(dirp)
# else
# define need_normalization(dirp, path) need_normalization(path)
# endif
static inline int
need_normalization(DIR *dirp, const char *path)
{
# if defined HAVE_FGETATTRLIST || defined HAVE_GETATTRLIST
u_int32_t attrbuf[SIZEUP32(fsobj_tag_t)];
struct attrlist al = {ATTR_BIT_MAP_COUNT, 0, ATTR_CMN_OBJTAG,};
# if defined HAVE_FGETATTRLIST
int ret = fgetattrlist(dirfd(dirp), &al, attrbuf, sizeof(attrbuf), 0);
# else
int ret = getattrlist(path, &al, attrbuf, sizeof(attrbuf), 0);
# endif
if (!ret) {
const fsobj_tag_t *tag = (void *)(attrbuf+1);
switch (*tag) {
case VT_HFS:
case VT_CIFS:
return TRUE;
}
}
# endif
return FALSE;
}
static inline int
has_nonascii(const char *ptr, size_t len)
{
while (len > 0) {
if (!ISASCII(*ptr)) return 1;
ptr++;
--len;
}
return 0;
}
# define IF_NORMALIZE_UTF8PATH(something) something
#else
# define IF_NORMALIZE_UTF8PATH(something) /* nothing */
#endif
#if defined(IFTODT) && defined(DT_UNKNOWN)
# define EMULATE_IFTODT 0
#else
# define EMULATE_IFTODT 1
#endif
#if EMULATE_IFTODT
# define IFTODT(m) (((m) & S_IFMT) / ((~S_IFMT & (S_IFMT-1)) + 1))
#endif
typedef enum {
#if !EMULATE_IFTODT
path_exist = DT_UNKNOWN,
path_directory = DT_DIR,
path_regular = DT_REG,
path_symlink = DT_LNK,
#else
path_exist,
path_directory = IFTODT(S_IFDIR),
path_regular = IFTODT(S_IFREG),
path_symlink = IFTODT(S_IFLNK),
#endif
path_noent = -1,
path_unknown = -2
} rb_pathtype_t;
#define FNM_NOESCAPE 0x01
#define FNM_PATHNAME 0x02
#define FNM_DOTMATCH 0x04
#define FNM_CASEFOLD 0x08
#define FNM_EXTGLOB 0x10
#if CASEFOLD_FILESYSTEM
#define FNM_SYSCASE FNM_CASEFOLD
#else
#define FNM_SYSCASE 0
#endif
#ifdef _WIN32
#define FNM_SHORTNAME 0x20
#else
#define FNM_SHORTNAME 0
#endif
#define FNM_GLOB_NOSORT 0x40
#define FNM_GLOB_SKIPDOT 0x80
#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, r2) == 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. (up to '/' 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;
const VALUE path;
rb_encoding *enc;
};
static void
dir_free(void *ptr)
{
struct dir_data *dir = ptr;
if (dir->dir) closedir(dir->dir);
}
RUBY_REFERENCES_START(dir_refs)
REF_EDGE(dir_data, path),
RUBY_REFERENCES_END
static const rb_data_type_t dir_data_type = {
"dir",
{
REFS_LIST_PTR(dir_refs),
dir_free,
NULL, // Nothing allocated externally, so don't need a memsize function
},
0, NULL, RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_DECL_MARKING | RUBY_TYPED_EMBEDDABLE
};
static VALUE dir_close(VALUE);
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;
RB_OBJ_WRITE(obj, &dirp->path, Qnil);
dirp->enc = NULL;
return obj;
}
static void *
nogvl_opendir(void *ptr)
{
const char *path = ptr;
return (void *)opendir(path);
}
static DIR *
opendir_without_gvl(const char *path)
{
if (vm_initialized) {
union { const void *in; void *out; } u;
u.in = path;
return rb_thread_call_without_gvl(nogvl_opendir, u.out, RUBY_UBF_IO, 0);
}
else
return opendir(path);
}
static VALUE
dir_initialize(rb_execution_context_t *ec, VALUE dir, VALUE dirname, VALUE enc)
{
struct dir_data *dp;
VALUE orig;
const char *path;
rb_encoding *fsenc = NIL_P(enc) ? rb_filesystem_encoding() : rb_to_encoding(enc);
FilePathValue(dirname);
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;
RB_OBJ_WRITE(dir, &dp->path, Qnil);
dp->enc = fsenc;
path = RSTRING_PTR(dirname);
dp->dir = opendir_without_gvl(path);
if (dp->dir == NULL) {
int e = errno;
if (rb_gc_for_fd(e)) {
dp->dir = opendir_without_gvl(path);
}
#ifdef HAVE_GETATTRLIST
else if (e == EIO) {
u_int32_t attrbuf[1];
struct attrlist al = {ATTR_BIT_MAP_COUNT, 0};
if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), FSOPT_NOFOLLOW) == 0) {
dp->dir = opendir_without_gvl(path);
}
}
#endif
if (dp->dir == NULL) {
RB_GC_GUARD(dirname);
rb_syserr_fail_path(e, orig);
}
}
RB_OBJ_WRITE(dir, &dp->path, orig);
return dir;
}
static VALUE
dir_s_open(rb_execution_context_t *ec, VALUE klass, VALUE dirname, VALUE enc)
{
struct dir_data *dp;
VALUE dir = TypedData_Make_Struct(klass, struct dir_data, &dir_data_type, dp);
dir_initialize(ec, dir, dirname, enc);
return dir;
}
static VALUE
dir_s_close(rb_execution_context_t *ec, VALUE klass, VALUE dir)
{
return dir_close(dir);
}
# if defined(HAVE_FDOPENDIR) && defined(HAVE_DIRFD)
/*
* call-seq:
* Dir.for_fd(fd) -> dir
*
* Returns a new \Dir object representing the directory specified by the given
* integer directory file descriptor +fd+:
*
* d0 = Dir.new('..')
* d1 = Dir.for_fd(d0.fileno)
*
* Note that the returned +d1+ does not have an associated path:
*
* d0.path # => '..'
* d1.path # => nil
*
* This method uses the
* {fdopendir()}[https://www.man7.org/linux/man-pages/man3/fdopendir.3p.html]
* function defined by POSIX 2008;
* the method is not implemented on non-POSIX platforms (raises NotImplementedError).
*/
static VALUE
dir_s_for_fd(VALUE klass, VALUE fd)
{
struct dir_data *dp;
VALUE dir = TypedData_Make_Struct(klass, struct dir_data, &dir_data_type, dp);
if (!(dp->dir = fdopendir(NUM2INT(fd)))) {
rb_sys_fail("fdopendir");
UNREACHABLE_RETURN(Qnil);
}
RB_OBJ_WRITE(dir, &dp->path, Qnil);
return dir;
}
#else
#define dir_s_for_fd rb_f_notimplement
#endif
NORETURN(static void dir_closed(void));
static void
dir_closed(void)
{
rb_raise(rb_eIOError, "closed directory");
}
static struct dir_data *
dir_get(VALUE dir)
{
rb_check_frozen(dir);
return rb_check_typeddata(dir, &dir_data_type);
}
static struct dir_data *
dir_check(VALUE dir)
{
struct dir_data *dirp = dir_get(dir);
if (!dirp->dir) dir_closed();
return dirp;
}
#define GetDIR(obj, dirp) ((dirp) = dir_check(obj))
/*
* call-seq:
* inspect -> string
*
* Returns a string description of +self+:
*
* Dir.new('example').inspect # => "#<Dir:example>"
*
*/
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_funcallv(dir, idTo_s, 0, 0);
}
/* Workaround for Solaris 10 that does not have dirfd.
Note: Solaris 11 (POSIX.1-2008 compliant) has dirfd(3C).
*/
#if defined(__sun) && !defined(HAVE_DIRFD)
# if defined(HAVE_DIR_D_FD)
# define dirfd(x) ((x)->d_fd)
# define HAVE_DIRFD 1
# elif defined(HAVE_DIR_DD_FD)
# define dirfd(x) ((x)->dd_fd)
# define HAVE_DIRFD 1
# endif
#endif
#ifdef HAVE_DIRFD
/*
* call-seq:
* fileno -> integer
*
* Returns the file descriptor used in <em>dir</em>.
*
* d = Dir.new('..')
* d.fileno # => 8
*
* This method uses the
* {dirfd()}[https://www.man7.org/linux/man-pages/man3/dirfd.3.html]
* function defined by POSIX 2008;
* the method is not implemented on non-POSIX platforms (raises NotImplementedError).
*/
static VALUE
dir_fileno(VALUE dir)
{
struct dir_data *dirp;
int fd;
GetDIR(dir, dirp);
fd = dirfd(dirp->dir);
if (fd == -1)
rb_sys_fail("dirfd");
return INT2NUM(fd);
}
#else
#define dir_fileno rb_f_notimplement
#endif
/*
* call-seq:
* path -> string or nil
*
* Returns the +dirpath+ string that was used to create +self+
* (or +nil+ if created by method Dir.for_fd):
*
* Dir.new('example').path # => "example"
*
*/
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 _WIN32
static int
fundamental_encoding_p(rb_encoding *enc)
{
switch (rb_enc_to_index(enc)) {
case ENCINDEX_ASCII_8BIT:
case ENCINDEX_US_ASCII:
case ENCINDEX_UTF_8:
return TRUE;
default:
return FALSE;
}
}
# define READDIR(dir, enc) rb_w32_readdir((dir), (enc))
#else
# define READDIR(dir, enc) readdir((dir))
#endif
/* safe to use without GVL */
static int
to_be_skipped(const struct dirent *dp)
{
const char *name = dp->d_name;
if (name[0] != '.') return FALSE;
#ifdef HAVE_DIRENT_NAMLEN
switch (NAMLEN(dp)) {
case 2:
if (name[1] != '.') return FALSE;
case 1:
return TRUE;
default:
break;
}
#else
if (!name[1]) return TRUE;
if (name[1] != '.') return FALSE;
if (!name[2]) return TRUE;
#endif
return FALSE;
}
/*
* call-seq:
* read -> string or nil
*
* Reads and returns the next entry name from +self+;
* returns +nil+ if at end-of-stream;
* see {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like]:
*
* dir = Dir.new('example')
* dir.read # => "."
* dir.read # => ".."
* dir.read # => "config.h"
*
*/
static VALUE
dir_read(VALUE dir)
{
struct dir_data *dirp;
struct dirent *dp;
GetDIR(dir, dirp);
rb_errno_set(0);
if ((dp = READDIR(dirp->dir, dirp->enc)) != NULL) {
return rb_external_str_new_with_enc(dp->d_name, NAMLEN(dp), dirp->enc);
}
else {
int e = errno;
if (e != 0) rb_syserr_fail(e, 0);
return Qnil; /* end of stream */
}
}
static VALUE dir_each_entry(VALUE, VALUE (*)(VALUE, VALUE), VALUE, int);
static VALUE
dir_yield(VALUE arg, VALUE path)
{
return rb_yield(path);
}
/*
* call-seq:
* each {|entry_name| ... } -> self
*
* Calls the block with each entry name in +self+:
*
* Dir.new('example').each {|entry_name| p entry_name }
*
* Output:
* "."
* ".."
* "config.h"
* "lib"
* "main.rb"
*
* With no block given, returns an Enumerator.
*
*/
static VALUE
dir_each(VALUE dir)
{
RETURN_ENUMERATOR(dir, 0, 0);
return dir_each_entry(dir, dir_yield, Qnil, FALSE);
}
static VALUE
dir_each_entry(VALUE dir, VALUE (*each)(VALUE, VALUE), VALUE arg, int children_only)
{
struct dir_data *dirp;
struct dirent *dp;
IF_NORMALIZE_UTF8PATH(int norm_p);
GetDIR(dir, dirp);
rewinddir(dirp->dir);
IF_NORMALIZE_UTF8PATH(norm_p = need_normalization(dirp->dir, RSTRING_PTR(dirp->path)));
while ((dp = READDIR(dirp->dir, dirp->enc)) != NULL) {
const char *name = dp->d_name;
size_t namlen = NAMLEN(dp);
VALUE path;
if (children_only && name[0] == '.') {
if (namlen == 1) continue; /* current directory */
if (namlen == 2 && name[1] == '.') continue; /* parent directory */
}
#if NORMALIZE_UTF8PATH
if (norm_p && has_nonascii(name, namlen) &&
!NIL_P(path = rb_str_normalize_ospath(name, namlen))) {
path = rb_external_str_with_enc(path, dirp->enc);
}
else
#endif
path = rb_external_str_new_with_enc(name, namlen, dirp->enc);
(*each)(arg, path);
}
return dir;
}
#ifdef HAVE_TELLDIR
/*
* call-seq:
* tell -> integer
*
* Returns the current position of +self+;
* see {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like]:
*
* dir = Dir.new('example')
* dir.tell # => 0
* dir.read # => "."
* dir.tell # => 1
*
*/
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:
* seek(position) -> self
*
* Sets the position in +self+ and returns +self+.
* The value of +position+ should have been returned from an earlier call to #tell;
* if not, the return values from subsequent calls to #read are unspecified.
*
* See {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like].
*
* Examples:
*
* dir = Dir.new('example')
* dir.pos # => 0
* dir.seek(3) # => #<Dir:example>
* dir.pos # => 3
* dir.seek(30) # => #<Dir:example>
* dir.pos # => 5
*
*/
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
#ifdef HAVE_SEEKDIR
/*
* call-seq:
* pos = position -> integer
*
* Sets the position in +self+ and returns +position+.
* The value of +position+ should have been returned from an earlier call to #tell;
* if not, the return values from subsequent calls to #read are unspecified.
*
* See {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like].
*
* Examples:
*
* dir = Dir.new('example')
* dir.pos # => 0
* dir.pos = 3 # => 3
* dir.pos # => 3
* dir.pos = 30 # => 30
* dir.pos # => 5
*
*/
static VALUE
dir_set_pos(VALUE dir, VALUE pos)
{
dir_seek(dir, pos);
return pos;
}
#else
#define dir_set_pos rb_f_notimplement
#endif
/*
* call-seq:
* rewind -> self
*
* Sets the position in +self+ to zero;
* see {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like]:
*
* dir = Dir.new('example')
* dir.read # => "."
* dir.read # => ".."
* dir.pos # => 2
* dir.rewind # => #<Dir:example>
* dir.pos # => 0
*
*/
static VALUE
dir_rewind(VALUE dir)
{
struct dir_data *dirp;
GetDIR(dir, dirp);
rewinddir(dirp->dir);
return dir;
}