1 /* Work around platform bugs in stat.
2 Copyright (C) 2009-2021 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 /* Written by Eric Blake and Bruno Haible. */
19 /* If the user's config.h happens to include <sys/stat.h>, let it include only
20 the system's <sys/stat.h> here, so that orig_stat doesn't recurse to
22 #define __need_system_sys_stat_h
25 /* Get the original definition of stat. It might be defined as a macro. */
26 #include <sys/types.h>
28 #undef __need_system_sys_stat_h
30 #if defined _WIN32 && ! defined __CYGWIN__
31 # define WINDOWS_NATIVE
34 #if !defined WINDOWS_NATIVE
37 orig_stat (const char *filename, struct stat *buf)
39 return stat (filename, buf);
46 /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
47 eliminates this include because of the preliminary #include <sys/stat.h>
49 # include "sys/stat.h"
51 # include <sys/stat.h>
54 #include "stat-time.h"
65 # define WIN32_LEAN_AND_MEAN
67 # include "stat-w32.h"
68 /* Don't assume that UNICODE is not defined. */
69 # undef WIN32_FIND_DATA
70 # define WIN32_FIND_DATA WIN32_FIND_DATAA
72 # define CreateFile CreateFileA
74 # define FindFirstFile FindFirstFileA
78 /* Return TRUE if the given file name denotes an UNC root. */
80 is_unc_root (const char *rname)
82 /* Test whether it has the syntax '\\server\share'. */
83 if (ISSLASH (rname[0]) && ISSLASH (rname[1]))
85 /* It starts with two slashes. Find the next slash. */
86 const char *p = rname + 2;
88 while (*q != '\0' && !ISSLASH (*q))
90 if (q > p && *q != '\0')
92 /* Found the next slash at q. */
95 while (*r != '\0' && !ISSLASH (*r))
97 if (r > q && *r == '\0')
105 /* Store information about NAME into ST. Work around bugs with
106 trailing slashes. Mingw has other bugs (such as st_ino always
107 being 0 on success) which this wrapper does not work around. But
108 at least this implementation provides the ability to emulate fchdir
112 rpl_stat (char const *name, struct stat *buf)
114 #ifdef WINDOWS_NATIVE
115 /* Fill the fields ourselves, because the original stat function returns
116 values for st_atime, st_mtime, st_ctime that depend on the current time
118 <https://lists.gnu.org/r/bug-gnulib/2017-04/msg00134.html> */
119 /* XXX Should we convert to wchar_t* and prepend '\\?\', in order to work
120 around length limitations
121 <https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file> ? */
123 /* POSIX <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13>
124 specifies: "More than two leading <slash> characters shall be treated as
125 a single <slash> character." */
126 if (ISSLASH (name[0]) && ISSLASH (name[1]) && ISSLASH (name[2]))
129 while (ISSLASH (name[1]))
133 size_t len = strlen (name);
134 size_t drive_prefix_len = (HAS_DEVICE (name) ? 2 : 0);
136 /* Remove trailing slashes (except the very first one, at position
137 drive_prefix_len), but remember their presence. */
139 bool check_dir = false;
142 while (rlen > drive_prefix_len && ISSLASH (name[rlen-1]))
145 if (rlen == drive_prefix_len + 1)
150 /* Handle '' and 'C:'. */
151 if (!check_dir && rlen == drive_prefix_len)
158 if (rlen == 1 && ISSLASH (name[0]) && len >= 2)
169 malloca_rname = NULL;
173 malloca_rname = malloca (rlen + 1);
174 if (malloca_rname == NULL)
179 memcpy (malloca_rname, name, rlen);
180 malloca_rname[rlen] = '\0';
181 rname = malloca_rname;
184 /* There are two ways to get at the requested information:
185 - by scanning the parent directory and examining the relevant
187 - by opening the file directly.
188 The first approach fails for root directories (e.g. 'C:\') and
189 UNC root directories (e.g. '\\server\share').
190 The second approach fails for some system files (e.g. 'C:\pagefile.sys'
191 and 'C:\hiberfil.sys'): ERROR_SHARING_VIOLATION.
192 The second approach gives more information (in particular, correct
193 st_dev, st_ino, st_nlink fields).
194 So we use the second approach and, as a fallback except for root and
195 UNC root directories, also the first approach. */
200 /* Approach based on the file. */
202 /* Open a handle to the file.
204 <https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-createfilea>
205 <https://docs.microsoft.com/en-us/windows/desktop/FileIO/creating-and-opening-files> */
208 FILE_READ_ATTRIBUTES,
209 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
212 /* FILE_FLAG_POSIX_SEMANTICS (treat file names that differ only
213 in case as different) makes sense only when applied to *all*
214 filesystem operations. */
215 FILE_FLAG_BACKUP_SEMANTICS /* | FILE_FLAG_POSIX_SEMANTICS */,
217 if (h != INVALID_HANDLE_VALUE)
219 ret = _gl_fstat_by_handle (h, rname, buf);
225 /* Test for root and UNC root directories. */
226 if ((rlen == drive_prefix_len + 1 && ISSLASH (rname[drive_prefix_len]))
227 || is_unc_root (rname))
232 /* Approach based on the directory entry. */
234 if (strchr (rname, '?') != NULL || strchr (rname, '*') != NULL)
236 /* Other Windows API functions would fail with error
237 ERROR_INVALID_NAME. */
238 if (malloca_rname != NULL)
239 freea (malloca_rname);
244 /* Get the details about the directory entry. This can be done through
246 <https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-findfirstfilea>
247 <https://docs.microsoft.com/en-us/windows/desktop/api/minwinbase/ns-minwinbase-_win32_find_dataa>
249 FindFirstFileEx with argument FindExInfoBasic
250 <https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-findfirstfileexa>
251 <https://docs.microsoft.com/en-us/windows/desktop/api/minwinbase/ne-minwinbase-findex_info_levels>
252 <https://docs.microsoft.com/en-us/windows/desktop/api/minwinbase/ns-minwinbase-_win32_find_dataa> */
253 WIN32_FIND_DATA info;
254 HANDLE h = FindFirstFile (rname, &info);
255 if (h == INVALID_HANDLE_VALUE)
258 /* Test for error conditions before starting to fill *buf. */
259 if (sizeof (buf->st_size) <= 4 && info.nFileSizeHigh > 0)
262 if (malloca_rname != NULL)
263 freea (malloca_rname);
268 # if _GL_WINDOWS_STAT_INODES
270 # if _GL_WINDOWS_STAT_INODES == 2
271 buf->st_ino._gl_ino[0] = buf->st_ino._gl_ino[1] = 0;
272 # else /* _GL_WINDOWS_STAT_INODES == 1 */
276 /* st_ino is not wide enough for identifying a file on a device.
277 Without st_ino, st_dev is pointless. */
284 /* XXX How to handle FILE_ATTRIBUTE_REPARSE_POINT ? */
285 ((info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ? _S_IFDIR | S_IEXEC_UGO : _S_IFREG)
287 | ((info.dwFileAttributes & FILE_ATTRIBUTE_READONLY) ? 0 : S_IWRITE_UGO);
288 if (!(info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
290 /* Determine whether the file is executable by looking at the file
292 if (info.nFileSizeHigh > 0 || info.nFileSizeLow > 0)
294 const char *last_dot = NULL;
296 for (p = info.cFileName; *p != '\0'; p++)
299 if (last_dot != NULL)
301 const char *suffix = last_dot + 1;
302 if (_stricmp (suffix, "exe") == 0
303 || _stricmp (suffix, "bat") == 0
304 || _stricmp (suffix, "cmd") == 0
305 || _stricmp (suffix, "com") == 0)
312 /* st_nlink. Ignore hard links here. */
315 /* There's no easy way to map the Windows SID concept to an integer. */
319 /* st_rdev is irrelevant for normal files and directories. */
323 if (sizeof (buf->st_size) <= 4)
324 /* Range check already done above. */
325 buf->st_size = info.nFileSizeLow;
327 buf->st_size = ((long long) info.nFileSizeHigh << 32) | (long long) info.nFileSizeLow;
329 /* st_atime, st_mtime, st_ctime. */
330 # if _GL_WINDOWS_STAT_TIMESPEC
331 buf->st_atim = _gl_convert_FILETIME_to_timespec (&info.ftLastAccessTime);
332 buf->st_mtim = _gl_convert_FILETIME_to_timespec (&info.ftLastWriteTime);
333 buf->st_ctim = _gl_convert_FILETIME_to_timespec (&info.ftCreationTime);
335 buf->st_atime = _gl_convert_FILETIME_to_POSIX (&info.ftLastAccessTime);
336 buf->st_mtime = _gl_convert_FILETIME_to_POSIX (&info.ftLastWriteTime);
337 buf->st_ctime = _gl_convert_FILETIME_to_POSIX (&info.ftCreationTime);
346 if (ret >= 0 && check_dir && !S_ISDIR (buf->st_mode))
351 if (malloca_rname != NULL)
353 int saved_errno = errno;
354 freea (malloca_rname);
362 DWORD error = GetLastError ();
364 fprintf (stderr, "rpl_stat error 0x%x\n", (unsigned int) error);
367 if (malloca_rname != NULL)
368 freea (malloca_rname);
372 /* Some of these errors probably cannot happen with the specific flags
373 that we pass to CreateFile. But who knows... */
374 case ERROR_FILE_NOT_FOUND: /* The last component of rname does not exist. */
375 case ERROR_PATH_NOT_FOUND: /* Some directory component in rname does not exist. */
376 case ERROR_BAD_PATHNAME: /* rname is such as '\\server'. */
377 case ERROR_BAD_NET_NAME: /* rname is such as '\\server\nonexistentshare'. */
378 case ERROR_INVALID_NAME: /* rname contains wildcards, misplaced colon, etc. */
379 case ERROR_DIRECTORY:
383 case ERROR_ACCESS_DENIED: /* rname is such as 'C:\System Volume Information\foo'. */
384 case ERROR_SHARING_VIOLATION: /* rname is such as 'C:\pagefile.sys' (second approach only). */
385 /* XXX map to EACCES or EPERM? */
389 case ERROR_OUTOFMEMORY:
393 case ERROR_WRITE_PROTECT:
397 case ERROR_WRITE_FAULT:
398 case ERROR_READ_FAULT:
399 case ERROR_GEN_FAILURE:
403 case ERROR_BUFFER_OVERFLOW:
404 case ERROR_FILENAME_EXCED_RANGE:
405 errno = ENAMETOOLONG;
408 case ERROR_DELETE_PENDING: /* XXX map to EACCES or EPERM? */
420 int result = orig_stat (name, buf);
423 # if REPLACE_FUNC_STAT_FILE
424 /* Solaris 9 mistakenly succeeds when given a non-directory with a
426 if (!S_ISDIR (buf->st_mode))
428 size_t len = strlen (name);
429 if (ISSLASH (name[len - 1]))
435 # endif /* REPLACE_FUNC_STAT_FILE */
436 result = stat_time_normalize (result, buf);