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-rw-r--r--lib/utime.c288
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diff --git a/lib/utime.c b/lib/utime.c
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+/* Work around platform bugs in utime.
+ Copyright (C) 2017-2022 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation, either version 3 of the
+ License, or (at your option) any later version.
+
+ This file is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible. */
+
+#include <config.h>
+
+/* Specification. */
+#include <utime.h>
+
+#if defined _WIN32 && ! defined __CYGWIN__
+
+# include <errno.h>
+# include <stdbool.h>
+# include <windows.h>
+# include "filename.h"
+# include "malloca.h"
+
+/* Don't assume that UNICODE is not defined. */
+# undef CreateFile
+# define CreateFile CreateFileA
+# undef GetFileAttributes
+# define GetFileAttributes GetFileAttributesA
+
+int
+_gl_utimens_windows (const char *name, struct timespec ts[2])
+{
+ /* POSIX <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13>
+ specifies: "More than two leading <slash> characters shall be treated as
+ a single <slash> character." */
+ if (ISSLASH (name[0]) && ISSLASH (name[1]) && ISSLASH (name[2]))
+ {
+ name += 2;
+ while (ISSLASH (name[1]))
+ name++;
+ }
+
+ size_t len = strlen (name);
+ size_t drive_prefix_len = (HAS_DEVICE (name) ? 2 : 0);
+
+ /* Remove trailing slashes (except the very first one, at position
+ drive_prefix_len), but remember their presence. */
+ size_t rlen;
+ bool check_dir = false;
+
+ rlen = len;
+ while (rlen > drive_prefix_len && ISSLASH (name[rlen-1]))
+ {
+ check_dir = true;
+ if (rlen == drive_prefix_len + 1)
+ break;
+ rlen--;
+ }
+
+ const char *rname;
+ char *malloca_rname;
+ if (rlen == len)
+ {
+ rname = name;
+ malloca_rname = NULL;
+ }
+ else
+ {
+ malloca_rname = malloca (rlen + 1);
+ if (malloca_rname == NULL)
+ {
+ errno = ENOMEM;
+ return -1;
+ }
+ memcpy (malloca_rname, name, rlen);
+ malloca_rname[rlen] = '\0';
+ rname = malloca_rname;
+ }
+
+ DWORD error;
+
+ /* Open a handle to the file.
+ CreateFile
+ <https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-createfilea>
+ <https://docs.microsoft.com/en-us/windows/desktop/FileIO/creating-and-opening-files> */
+ HANDLE handle =
+ CreateFile (rname,
+ FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES,
+ FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+ NULL,
+ OPEN_EXISTING,
+ /* FILE_FLAG_POSIX_SEMANTICS (treat file names that differ only
+ in case as different) makes sense only when applied to *all*
+ filesystem operations. */
+ FILE_FLAG_BACKUP_SEMANTICS /* | FILE_FLAG_POSIX_SEMANTICS */,
+ NULL);
+ if (handle == INVALID_HANDLE_VALUE)
+ {
+ error = GetLastError ();
+ goto failed;
+ }
+
+ if (check_dir)
+ {
+ /* GetFileAttributes
+ <https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-getfileattributesa> */
+ DWORD attributes = GetFileAttributes (rname);
+ if (attributes == INVALID_FILE_ATTRIBUTES)
+ {
+ error = GetLastError ();
+ CloseHandle (handle);
+ goto failed;
+ }
+ if ((attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
+ {
+ CloseHandle (handle);
+ if (malloca_rname != NULL)
+ freea (malloca_rname);
+ errno = ENOTDIR;
+ return -1;
+ }
+ }
+
+ {
+ /* Use SetFileTime(). See
+ <https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-setfiletime>
+ <https://docs.microsoft.com/en-us/windows/desktop/api/minwinbase/ns-minwinbase-filetime> */
+ FILETIME last_access_time;
+ FILETIME last_write_time;
+ if (ts == NULL)
+ {
+ /* GetSystemTimeAsFileTime is the same as
+ GetSystemTime followed by SystemTimeToFileTime.
+ <https://docs.microsoft.com/en-us/windows/desktop/api/sysinfoapi/nf-sysinfoapi-getsystemtimeasfiletime>.
+ It would be overkill to use
+ GetSystemTimePreciseAsFileTime
+ <https://docs.microsoft.com/en-us/windows/desktop/api/sysinfoapi/nf-sysinfoapi-getsystemtimepreciseasfiletime>. */
+ FILETIME current_time;
+ GetSystemTimeAsFileTime (&current_time);
+ last_access_time = current_time;
+ last_write_time = current_time;
+ }
+ else
+ {
+ {
+ ULONGLONG time_since_16010101 =
+ (ULONGLONG) ts[0].tv_sec * 10000000 + ts[0].tv_nsec / 100 + 116444736000000000LL;
+ last_access_time.dwLowDateTime = (DWORD) time_since_16010101;
+ last_access_time.dwHighDateTime = time_since_16010101 >> 32;
+ }
+ {
+ ULONGLONG time_since_16010101 =
+ (ULONGLONG) ts[1].tv_sec * 10000000 + ts[1].tv_nsec / 100 + 116444736000000000LL;
+ last_write_time.dwLowDateTime = (DWORD) time_since_16010101;
+ last_write_time.dwHighDateTime = time_since_16010101 >> 32;
+ }
+ }
+ if (SetFileTime (handle, NULL, &last_access_time, &last_write_time))
+ {
+ CloseHandle (handle);
+ if (malloca_rname != NULL)
+ freea (malloca_rname);
+ return 0;
+ }
+ else
+ {
+ #if 0
+ DWORD sft_error = GetLastError ();
+ fprintf (stderr, "utimens SetFileTime error 0x%x\n", (unsigned int) sft_error);
+ #endif
+ CloseHandle (handle);
+ if (malloca_rname != NULL)
+ freea (malloca_rname);
+ errno = EINVAL;
+ return -1;
+ }
+ }
+
+ failed:
+ {
+ #if 0
+ fprintf (stderr, "utimens CreateFile/GetFileAttributes error 0x%x\n", (unsigned int) error);
+ #endif
+ if (malloca_rname != NULL)
+ freea (malloca_rname);
+
+ switch (error)
+ {
+ /* Some of these errors probably cannot happen with the specific flags
+ that we pass to CreateFile. But who knows... */
+ case ERROR_FILE_NOT_FOUND: /* The last component of rname does not exist. */
+ case ERROR_PATH_NOT_FOUND: /* Some directory component in rname does not exist. */
+ case ERROR_BAD_PATHNAME: /* rname is such as '\\server'. */
+ case ERROR_BAD_NETPATH: /* rname is such as '\\nonexistentserver\share'. */
+ case ERROR_BAD_NET_NAME: /* rname is such as '\\server\nonexistentshare'. */
+ case ERROR_INVALID_NAME: /* rname contains wildcards, misplaced colon, etc. */
+ case ERROR_DIRECTORY:
+ errno = ENOENT;
+ break;
+
+ case ERROR_ACCESS_DENIED: /* rname is such as 'C:\System Volume Information\foo'. */
+ case ERROR_SHARING_VIOLATION: /* rname is such as 'C:\pagefile.sys'. */
+ errno = (ts != NULL ? EPERM : EACCES);
+ break;
+
+ case ERROR_OUTOFMEMORY:
+ errno = ENOMEM;
+ break;
+
+ case ERROR_WRITE_PROTECT:
+ errno = EROFS;
+ break;
+
+ case ERROR_WRITE_FAULT:
+ case ERROR_READ_FAULT:
+ case ERROR_GEN_FAILURE:
+ errno = EIO;
+ break;
+
+ case ERROR_BUFFER_OVERFLOW:
+ case ERROR_FILENAME_EXCED_RANGE:
+ errno = ENAMETOOLONG;
+ break;
+
+ case ERROR_DELETE_PENDING: /* XXX map to EACCES or EPERM? */
+ errno = EPERM;
+ break;
+
+ default:
+ errno = EINVAL;
+ break;
+ }
+
+ return -1;
+ }
+}
+
+int
+utime (const char *name, const struct utimbuf *ts)
+{
+ if (ts == NULL)
+ return _gl_utimens_windows (name, NULL);
+ else
+ {
+ struct timespec ts_with_nanoseconds[2];
+ ts_with_nanoseconds[0].tv_sec = ts->actime;
+ ts_with_nanoseconds[0].tv_nsec = 0;
+ ts_with_nanoseconds[1].tv_sec = ts->modtime;
+ ts_with_nanoseconds[1].tv_nsec = 0;
+ return _gl_utimens_windows (name, ts_with_nanoseconds);
+ }
+}
+
+#else
+
+# include <errno.h>
+# include <sys/stat.h>
+# include "filename.h"
+
+int
+utime (const char *name, const struct utimbuf *ts)
+#undef utime
+{
+# if REPLACE_FUNC_UTIME_FILE
+ /* macOS 10.13 mistakenly succeeds when given a symbolic link to a
+ non-directory with a trailing slash. */
+ size_t len = strlen (name);
+ if (len > 0 && ISSLASH (name[len - 1]))
+ {
+ struct stat buf;
+
+ if (stat (name, &buf) == -1 && errno != EOVERFLOW)
+ return -1;
+ }
+# endif /* REPLACE_FUNC_UTIME_FILE */
+
+ return utime (name, ts);
+}
+
+#endif
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