src/win32/filesystem.c

   1 /*****************************************************************************
   2  * filesystem.c: Windows file system helpers
   3  *****************************************************************************
   4  * Copyright (C) 2005-2006 VLC authors and VideoLAN
   5  * Copyright © 2005-2008 Rémi Denis-Courmont
   6  *
   7  * Authors: Rémi Denis-Courmont <rem # videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <assert.h>
  32
  33 #include <stdio.h>
  34 #include <errno.h>
  35 #include <sys/types.h>
  36 #include <dirent.h>
  37 #include <sys/stat.h>
  38 #include <fcntl.h>
  39 #include <winsock2.h>
  40 #include <direct.h>
  41
  42 #include <vlc_common.h>
  43 #include <vlc_charset.h>
  44 #include <vlc_fs.h>
  45 #include "libvlc.h" /* vlc_mkdir */
  46
  47 #ifdef _MSC_VER
  48 # define __STDC__ 1
  49 # include <io.h> /* _pipe */
  50 #endif
  51
  52 static wchar_t *widen_path (const char *path)
  53 {
  54     wchar_t *wpath;
  55
  56     errno = 0;
  57     wpath = ToWide (path);
  58     if (wpath == NULL)
  59     {
  60         if (errno == 0)
  61             errno = ENOENT;
  62         return NULL;
  63     }
  64     return wpath;
  65 }
  66
  67 #define CONVERT_PATH(path, wpath, err) \
  68     wchar_t *wpath = wide_path(path); \
  69     if (wpath == NULL) return (err)
  70
  71
  72 int vlc_open (const char *filename, int flags, ...)
  73 {
  74     int mode = 0;
  75     va_list ap;
  76
  77     flags |= O_NOINHERIT; /* O_CLOEXEC */
  78     /* Defaults to binary mode */
  79     if ((flags & O_TEXT) == 0)
  80         flags |= O_BINARY;
  81
  82     va_start (ap, flags);
  83     if (flags & O_CREAT)
  84         mode = va_arg (ap, int);
  85     va_end (ap);
  86
  87     /*
  88      * open() cannot open files with non-“ANSI” characters on Windows.
  89      * We use _wopen() instead. Same thing for mkdir() and stat().
  90      */
  91     wchar_t *wpath = widen_path (filename);
  92     if (wpath == NULL)
  93         return -1;
  94
  95     int fd = _wopen (wpath, flags, mode);
  96     free (wpath);
  97     return fd;
  98 }
  99
 100 int vlc_openat (int dir, const char *filename, int flags, ...)
 101 {
 102     (void) dir; (void) filename; (void) flags;
 103     errno = ENOSYS;
 104     return -1;
 105 }
 106
 107 int vlc_mkdir( const char *dirname, mode_t mode )
 108 {
 109     wchar_t *wpath = widen_path (dirname);
 110     if (wpath == NULL)
 111         return -1;
 112
 113     int ret = _wmkdir (wpath);
 114     free (wpath);
 115     (void) mode;
 116     return ret;
 117 }
 118
 119 char *vlc_getcwd (void)
 120 {
 121     wchar_t *wdir = _wgetcwd (NULL, 0);
 122     if (wdir == NULL)
 123         return NULL;
 124
 125     char *dir = FromWide (wdir);
 126     free (wdir);
 127     return dir;
 128 }
 129
 130 /* Under Windows, these wrappers return the list of drive letters
 131  * when called with an empty argument or just '\'. */
 132 DIR *vlc_opendir (const char *dirname)
 133 {
 134     wchar_t *wpath = widen_path (dirname);
 135     if (wpath == NULL)
 136         return NULL;
 137
 138     vlc_DIR *p_dir = malloc (sizeof (*p_dir));
 139     if (unlikely(p_dir == NULL))
 140     {
 141         free(wpath);
 142         return NULL;
 143     }
 144
 145 #if !VLC_WINSTORE_APP
 146     /* Special mode to list drive letters */
 147     if (wpath[0] == L'\0' || (wcscmp (wpath, L"\\") == 0))
 148     {
 149         free (wpath);
 150         p_dir->wdir = NULL;
 151         p_dir->u.drives = GetLogicalDrives ();
 152         return (void *)p_dir;
 153     }
 154 #endif
 155
 156     assert (wpath[0]); // wpath[1] is defined
 157     p_dir->u.insert_dot_dot = !wcscmp (wpath + 1, L":\\");
 158
 159     _WDIR *wdir = _wopendir (wpath);
 160     free (wpath);
 161     if (wdir == NULL)
 162     {
 163         free (p_dir);
 164         return NULL;
 165     }
 166     p_dir->wdir = wdir;
 167     p_dir->entry = NULL;
 168     return (void *)p_dir;
 169 }
 170
 171 char *vlc_readdir (DIR *dir)
 172 {
 173     vlc_DIR *p_dir = (vlc_DIR *)dir;
 174
 175     free(p_dir->entry);
 176
 177 #if !VLC_WINSTORE_APP
 178     /* Drive letters mode */
 179     if (p_dir->wdir == NULL)
 180     {
 181         DWORD drives = p_dir->u.drives;
 182         if (drives == 0)
 183             return NULL; /* end */
 184
 185         unsigned int i;
 186         for (i = 0; !(drives & 1); i++)
 187             drives >>= 1;
 188         p_dir->u.drives &= ~(1UL << i);
 189         assert (i < 26);
 190
 191         if (asprintf (&p_dir->entry, "%c:\\", 'A' + i) == -1)
 192             p_dir->entry = NULL;
 193     }
 194     else
 195 #endif
 196     if (p_dir->u.insert_dot_dot)
 197     {
 198         /* Adds "..", gruik! */
 199         p_dir->u.insert_dot_dot = false;
 200         p_dir->entry = strdup ("..");
 201     }
 202     else
 203     {
 204         struct _wdirent *ent = _wreaddir (p_dir->wdir);
 205         p_dir->entry = (ent != NULL) ? FromWide (ent->d_name) : NULL;
 206     }
 207     return p_dir->entry;
 208 }
 209
 210 int vlc_stat (const char *filename, struct stat *buf)
 211 {
 212     wchar_t *wpath = widen_path (filename);
 213     if (wpath == NULL)
 214         return -1;
 215
 216     static_assert (sizeof (*buf) == sizeof (struct _stati64),
 217                    "Mismatched struct stat definition.");
 218
 219     int ret = _wstati64 (wpath, buf);
 220     free (wpath);
 221     return ret;
 222 }
 223
 224 int vlc_lstat (const char *filename, struct stat *buf)
 225 {
 226     return vlc_stat (filename, buf);
 227 }
 228
 229 int vlc_unlink (const char *filename)
 230 {
 231     wchar_t *wpath = widen_path (filename);
 232     if (wpath == NULL)
 233         return -1;
 234
 235     int ret = _wunlink (wpath);
 236     free (wpath);
 237     return ret;
 238 }
 239
 240 int vlc_rename (const char *oldpath, const char *newpath)
 241 {
 242     int ret = -1;
 243
 244     wchar_t *wold = widen_path (oldpath), *wnew = widen_path (newpath);
 245     if (wold == NULL || wnew == NULL)
 246         goto out;
 247
 248     if (_wrename (wold, wnew) && (errno == EACCES || errno == EEXIST))
 249     {   /* Windows does not allow atomic file replacement */
 250         if (_wremove (wnew))
 251         {
 252             errno = EACCES; /* restore errno */
 253             goto out;
 254         }
 255         if (_wrename (wold, wnew))
 256             goto out;
 257     }
 258     ret = 0;
 259 out:
 260     free (wnew);
 261     free (wold);
 262     return ret;
 263 }
 264
 265 int vlc_dup (int oldfd)
 266 {
 267     int fd = dup (oldfd);
 268     if (fd != -1)
 269         setmode (fd, O_BINARY);
 270     return fd;
 271 }
 272
 273 int vlc_pipe (int fds[2])
 274 {
 275 #if VLC_WINSTORE_APP
 276     _set_errno(EPERM);
 277     return -1;
 278 #else
 279     return _pipe (fds, 32768, O_NOINHERIT | O_BINARY);
 280 #endif
 281 }
 282
 283 #include <vlc_network.h>
 284
 285 int vlc_socket (int pf, int type, int proto, bool nonblock)
 286 {
 287     int fd = socket (pf, type, proto);
 288     if (fd == -1)
 289         return -1;
 290
 291     if (nonblock)
 292         ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
 293     return fd;
 294 }
 295
 296 int vlc_accept (int lfd, struct sockaddr *addr, socklen_t *alen, bool nonblock)
 297 {
 298     int fd = accept (lfd, addr, alen);
 299     if (fd != -1 && nonblock)
 300         ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
 301     return fd;
 302 }