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newlib-cygwin/winsup/cygwin/dir.cc

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/* dir.cc: Posix directory-related routines
Copyright 1996, 1997, 1998, 1999, 2000, 2001 Cygnus Solutions.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>
#define _COMPILING_NEWLIB
#include <dirent.h>
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "cygerrno.h"
#include "fhandler.h"
#include "perprocess.h"
#include "path.h"
#include "security.h"
#include "dtable.h"
#include "cygheap.h"
/* Cygwin internal */
/* Return whether the directory of a file is writable. Return 1 if it
is. Otherwise, return 0, and set errno appropriately. */
int __stdcall
writable_directory (const char *file)
{
#if 0
char dir[strlen (file) + 1];
strcpy (dir, file);
const char *usedir;
char *slash = strrchr (dir, '\\');
if (slash == NULL)
usedir = ".";
else if (slash == dir)
{
usedir = "\\";
}
else
{
*slash = '\0';
usedir = dir;
}
int acc = access (usedir, W_OK);
return acc == 0;
#else
return 1;
#endif
}
/* opendir: POSIX 5.1.2.1 */
extern "C" DIR *
opendir (const char *dirname)
{
int len;
DIR *dir;
DIR *res = 0;
struct stat statbuf;
path_conv real_dirname (dirname, PC_SYM_FOLLOW | PC_FULL);
if (real_dirname.error)
{
set_errno (real_dirname.error);
goto failed;
}
if (stat (real_dirname, &statbuf) == -1)
goto failed;
if (!(statbuf.st_mode & S_IFDIR))
{
set_errno (ENOTDIR);
goto failed;
}
len = strlen (real_dirname);
if (len > MAX_PATH - 3)
{
set_errno (ENAMETOOLONG);
goto failed;
}
if ((dir = (DIR *) malloc (sizeof (DIR))) == NULL)
{
set_errno (ENOMEM);
goto failed;
}
if ((dir->__d_dirname = (char *) malloc (len + 3)) == NULL)
{
free (dir);
set_errno (ENOMEM);
goto failed;
}
if ((dir->__d_dirent =
(struct dirent *) malloc (sizeof (struct dirent))) == NULL)
{
free (dir->__d_dirname);
free (dir);
set_errno (ENOMEM);
goto failed;
}
strcpy (dir->__d_dirname, real_dirname.get_win32 ());
/* FindFirstFile doesn't seem to like duplicate /'s. */
len = strlen (dir->__d_dirname);
if (len == 0 || SLASH_P (dir->__d_dirname[len - 1]))
strcat (dir->__d_dirname, "*");
else
strcat (dir->__d_dirname, "\\*"); /**/
dir->__d_cookie = __DIRENT_COOKIE;
dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE;
dir->__d_position = 0;
dir->__d_dirhash = statbuf.st_ino;
res = dir;
failed:
syscall_printf ("%p = opendir (%s)", res, dirname);
return res;
}
/* readdir: POSIX 5.1.2.1 */
extern "C" struct dirent *
readdir (DIR * dir)
{
WIN32_FIND_DATA buf;
HANDLE handle;
struct dirent *res = NULL;
if (dir->__d_cookie != __DIRENT_COOKIE)
{
set_errno (EBADF);
syscall_printf ("%p = readdir (%p)", res, dir);
return res;
}
if (dir->__d_u.__d_data.__handle == INVALID_HANDLE_VALUE
&& dir->__d_position == 0)
{
handle = FindFirstFileA (dir->__d_dirname, &buf);
DWORD lasterr = GetLastError ();
dir->__d_u.__d_data.__handle = handle;
if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES))
{
seterrno_from_win_error (__FILE__, __LINE__, lasterr);
return res;
}
}
else if (!FindNextFileA (dir->__d_u.__d_data.__handle, &buf))
{
DWORD lasterr = GetLastError ();
(void) FindClose (dir->__d_u.__d_data.__handle);
dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE;
/* POSIX says you shouldn't set errno when readdir can't
find any more files; so, if another error we leave it set. */
if (lasterr != ERROR_NO_MORE_FILES)
seterrno_from_win_error (__FILE__, __LINE__, lasterr);
syscall_printf ("%p = readdir (%p)", res, dir);
return res;
}
/* We get here if `buf' contains valid data. */
strcpy (dir->__d_dirent->d_name, buf.cFileName);
/* Check for Windows shortcut. If it's a Cygwin or U/WIN
symlink, drop the .lnk suffix. */
if (buf.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
{
char *c = dir->__d_dirent->d_name;
int len = strlen (c);
if (strcasematch (c + len - 4, ".lnk"))
{
char fbuf[MAX_PATH + 1];
strcpy (fbuf, dir->__d_dirname);
strcpy (fbuf + strlen (fbuf) - 1, dir->__d_dirent->d_name);
path_conv fpath (fbuf, PC_SYM_NOFOLLOW);
if (fpath.issymlink ())
c[len - 4] = '\0';
}
}
/* Compute d_ino by combining filename hash with the directory hash
(which was stored in dir->__d_dirhash when opendir was called). */
if (buf.cFileName[0] == '.')
{
if (buf.cFileName[1] == '\0')
dir->__d_dirent->d_ino = dir->__d_dirhash;
else if (buf.cFileName[1] != '.' || buf.cFileName[2] != '\0')
goto hashit;
else
{
char *p, up[strlen (dir->__d_dirname) + 1];
strcpy (up, dir->__d_dirname);
if (!(p = strrchr (up, '\\')))
goto hashit;
*p = '\0';
if (!(p = strrchr (up, '\\')))
dir->__d_dirent->d_ino = hash_path_name (0, ".");
else
{
*p = '\0';
dir->__d_dirent->d_ino = hash_path_name (0, up);
}
}
}
else
{
hashit:
ino_t dino = hash_path_name (dir->__d_dirhash, "\\");
dir->__d_dirent->d_ino = hash_path_name (dino, buf.cFileName);
}
++dir->__d_position;
res = dir->__d_dirent;
syscall_printf ("%p = readdir (%p) (%s)",
&dir->__d_dirent, dir, buf.cFileName);
return res;
}
/* telldir */
extern "C" off_t
telldir (DIR * dir)
{
if (dir->__d_cookie != __DIRENT_COOKIE)
return 0;
return dir->__d_position;
}
/* seekdir */
extern "C" void
seekdir (DIR * dir, off_t loc)
{
if (dir->__d_cookie != __DIRENT_COOKIE)
return;
rewinddir (dir);
while (loc > dir->__d_position)
if (! readdir (dir))
break;
}
/* rewinddir: POSIX 5.1.2.1 */
extern "C" void
rewinddir (DIR * dir)
{
syscall_printf ("rewinddir (%p)", dir);
if (dir->__d_cookie != __DIRENT_COOKIE)
return;
if (dir->__d_u.__d_data.__handle != INVALID_HANDLE_VALUE)
{
(void) FindClose (dir->__d_u.__d_data.__handle);
dir->__d_u.__d_data.__handle = INVALID_HANDLE_VALUE;
}
dir->__d_position = 0;
}
/* closedir: POSIX 5.1.2.1 */
extern "C" int
closedir (DIR * dir)
{
if (dir->__d_cookie != __DIRENT_COOKIE)
{
set_errno (EBADF);
syscall_printf ("-1 = closedir (%p)", dir);
return -1;
}
if (dir->__d_u.__d_data.__handle != INVALID_HANDLE_VALUE &&
FindClose (dir->__d_u.__d_data.__handle) == 0)
{
__seterrno ();
syscall_printf ("-1 = closedir (%p)", dir);
return -1;
}
/* Reset the marker in case the caller tries to use `dir' again. */
dir->__d_cookie = 0;
free (dir->__d_dirname);
free (dir->__d_dirent);
free (dir);
syscall_printf ("0 = closedir (%p)", dir);
return 0;
}
/* mkdir: POSIX 5.4.1.1 */
extern "C" int
mkdir (const char *dir, mode_t mode)
{
int res = -1;
path_conv real_dir (dir, PC_SYM_NOFOLLOW);
if (real_dir.error)
{
set_errno (real_dir.case_clash ? ECASECLASH : real_dir.error);
goto done;
}
nofinalslash(real_dir.get_win32 (), real_dir.get_win32 ());
if (! writable_directory (real_dir.get_win32 ()))
goto done;
if (CreateDirectoryA (real_dir.get_win32 (), 0))
{
set_file_attribute (real_dir.has_acls (), real_dir.get_win32 (),
S_IFDIR | ((mode & 0777) & ~cygheap->umask));
res = 0;
}
else
__seterrno ();
done:
syscall_printf ("%d = mkdir (%s, %d)", res, dir, mode);
return res;
}
/* rmdir: POSIX 5.5.2.1 */
extern "C" int
rmdir (const char *dir)
{
int res = -1;
path_conv real_dir (dir, PC_SYM_NOFOLLOW);
if (real_dir.error)
{
set_errno (real_dir.error);
goto done;
}
/* Is `dir' a directory? */
if (real_dir.file_attributes () == (DWORD) -1 ||
!(real_dir.file_attributes () & FILE_ATTRIBUTE_DIRECTORY))
{
set_errno (ENOTDIR);
goto done;
}
/* Even own directories can't be removed if R/O attribute is set. */
if (real_dir.file_attributes () & FILE_ATTRIBUTE_READONLY)
SetFileAttributes (real_dir.get_win32 (), real_dir.file_attributes () &
~FILE_ATTRIBUTE_READONLY);
if (RemoveDirectoryA (real_dir.get_win32 ()))
{
/* RemoveDirectory on a samba drive doesn't return an error if the
directory can't be removed because it's not empty. Checking for
existence afterwards keeps us informed about success. */
if (GetFileAttributesA (real_dir.get_win32 ()) != (DWORD) -1)
set_errno (ENOTEMPTY);
else
res = 0;
}
else
{
if (GetLastError() == ERROR_ACCESS_DENIED)
{
/* On 9X ERROR_ACCESS_DENIED is returned if you try to remove
a non-empty directory. */
if (os_being_run != winNT)
set_errno (ENOTEMPTY);
else
__seterrno ();
}
else
__seterrno ();
/* If directory still exists, restore R/O attribute. */
if (real_dir.file_attributes () & FILE_ATTRIBUTE_READONLY)
SetFileAttributes (real_dir.get_win32 (), real_dir.file_attributes ());
}
done:
syscall_printf ("%d = rmdir (%s)", res, dir);
return res;
}
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