updated for version 7.3.172

Problem:    MS-Windows: rename() might delete the file if the name differs but
	    it's actually the same file.
Solution:   Use the file handle to check if it's the same file. (Yukihiro
	    Nakadaira)

Author: brammool

src/fileio.c

@@ -6555,6 +6555,21 @@ vim_rename(from, to)
 	    use_tmp_file = TRUE;
     }
 #endif
+#ifdef WIN3264
+    {
+	BY_HANDLE_FILE_INFORMATION info1, info2;
+
+	/* It's possible for the source and destination to be the same file.
+	 * In that case go through a temp file name.  This makes rename("foo",
+	 * "./foo") a no-op (in a complicated way). */
+	if (win32_fileinfo(from, &info1) == FILEINFO_OK
+		&& win32_fileinfo(to, &info2) == FILEINFO_OK
+		&& info1.dwVolumeSerialNumber == info2.dwVolumeSerialNumber
+		&& info1.nFileIndexHigh == info2.nFileIndexHigh
+		&& info1.nFileIndexLow == info2.nFileIndexLow)
+	    use_tmp_file = TRUE;
+    }
+#endif
 
 #if defined(UNIX) || defined(CASE_INSENSITIVE_FILENAME)
     if (use_tmp_file)

src/if_cscope.c

@@ -1412,17 +1412,15 @@ cs_insert_filelist(fname, ppath, flags, sb)
 {
     short	i, j;
 #ifndef UNIX
-    HANDLE	hFile;
     BY_HANDLE_FILE_INFORMATION bhfi;
 
-    vim_memset(&bhfi, 0, sizeof(bhfi));
     /* On windows 9x GetFileInformationByHandle doesn't work, so skip it */
     if (!mch_windows95())
     {
-	hFile = CreateFile(fname, FILE_READ_ATTRIBUTES, 0, NULL, OPEN_EXISTING,
-						 FILE_ATTRIBUTE_NORMAL, NULL);
-	if (hFile == INVALID_HANDLE_VALUE)
+	switch (win32_fileinfo(fname, &bhfi))
 	{
+	case FILEINFO_ENC_FAIL:		/* enc_to_utf16() failed */
+	case FILEINFO_READ_FAIL:	/* CreateFile() failed */
 	    if (p_csverbose)
 	    {
 		char *cant_msg = _("E625: cannot open cscope database: %s");
@@ -1438,15 +1436,12 @@ cs_insert_filelist(fname, ppath, flags, sb)
 		    (void)EMSG2(cant_msg, fname);
 	    }
 	    return -1;
-	}
-	if (!GetFileInformationByHandle(hFile, &bhfi))
-	{
-	    CloseHandle(hFile);
+
+	case FILEINFO_INFO_FAIL:    /* GetFileInformationByHandle() failed */
 	    if (p_csverbose)
 		(void)EMSG(_("E626: cannot get cscope database information"));
 	    return -1;
 	}
-	CloseHandle(hFile);
     }
 #endif
 

src/os_win32.c

@@ -2644,26 +2644,45 @@ mch_isdir(char_u *name)
  */
     int
 mch_is_linked(char_u *fname)
+{
+    BY_HANDLE_FILE_INFORMATION info;
+
+    return win32_fileinfo(fname, &info) == FILEINFO_OK
+						   && info.nNumberOfLinks > 1;
+}
+
+/*
+ * Get the by-handle-file-information for "fname".
+ * Returns FILEINFO_OK when OK.
+ * returns FILEINFO_ENC_FAIL when enc_to_utf16() failed.
+ * Returns FILEINFO_READ_FAIL when CreateFile() failed.
+ * Returns FILEINFO_INFO_FAIL when GetFileInformationByHandle() failed.
+ */
+    int
+win32_fileinfo(char_u *fname, BY_HANDLE_FILE_INFORMATION *info)
 {
     HANDLE	hFile;
-    int		res = 0;
-    BY_HANDLE_FILE_INFORMATION inf;
+    int		res = FILEINFO_READ_FAIL;
 #ifdef FEAT_MBYTE
     WCHAR	*wn = NULL;
 
     if (enc_codepage >= 0 && (int)GetACP() != enc_codepage)
+    {
 	wn = enc_to_utf16(fname, NULL);
+	if (wn == NULL)
+	    res = FILEINFO_ENC_FAIL;
+    }
     if (wn != NULL)
     {
 	hFile = CreateFileW(wn,		/* file name */
 		    GENERIC_READ,	/* access mode */
-		    0,			/* share mode */
+		    FILE_SHARE_READ | FILE_SHARE_WRITE,	/* share mode */
 		    NULL,		/* security descriptor */
 		    OPEN_EXISTING,	/* creation disposition */
-		    0,			/* file attributes */
+		    FILE_FLAG_BACKUP_SEMANTICS,	/* file attributes */
 		    NULL);		/* handle to template file */
 	if (hFile == INVALID_HANDLE_VALUE
-		&& GetLastError() == ERROR_CALL_NOT_IMPLEMENTED)
+			      && GetLastError() == ERROR_CALL_NOT_IMPLEMENTED)
 	{
 	    /* Retry with non-wide function (for Windows 98). */
 	    vim_free(wn);
@@ -2674,17 +2693,18 @@ mch_is_linked(char_u *fname)
 #endif
 	hFile = CreateFile(fname,	/* file name */
 		    GENERIC_READ,	/* access mode */
-		    0,			/* share mode */
+		    FILE_SHARE_READ | FILE_SHARE_WRITE,	/* share mode */
 		    NULL,		/* security descriptor */
 		    OPEN_EXISTING,	/* creation disposition */
-		    0,			/* file attributes */
+		    FILE_FLAG_BACKUP_SEMANTICS,	/* file attributes */
 		    NULL);		/* handle to template file */
 
     if (hFile != INVALID_HANDLE_VALUE)
     {
-	if (GetFileInformationByHandle(hFile, &inf) != 0
-		&& inf.nNumberOfLinks > 1)
-	    res = 1;
+	if (GetFileInformationByHandle(hFile, info) != 0)
+	    res = FILEINFO_OK;
+	else
+	    res = FILEINFO_INFO_FAIL;
 	CloseHandle(hFile);
     }
 

src/proto/os_win32.pro

@@ -21,6 +21,7 @@ int mch_setperm __ARGS((char_u *name, long perm));
 void mch_hide __ARGS((char_u *name));
 int mch_isdir __ARGS((char_u *name));
 int mch_is_linked __ARGS((char_u *fname));
+int win32_fileinfo __ARGS((char_u *name, BY_HANDLE_FILE_INFORMATION *lpFileInfo));
 int mch_writable __ARGS((char_u *name));
 int mch_can_exe __ARGS((char_u *name));
 int mch_nodetype __ARGS((char_u *name));

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    172,
 /**/
     171,
 /**/

src/vim.h

@@ -2217,4 +2217,10 @@ typedef int VimClipboard;	/* This is required for the prototypes. */
 #define KEYLEN_PART_MAP -2	/* keylen value for incomplete mapping */
 #define KEYLEN_REMOVED  9999	/* keylen value for removed sequence */
 
+/* Return values from win32_fileinfo(). */
+#define FILEINFO_OK	     0
+#define FILEINFO_ENC_FAIL    1	/* enc_to_utf16() failed */
+#define FILEINFO_READ_FAIL   2	/* CreateFile() failed */
+#define FILEINFO_INFO_FAIL   3	/* GetFileInformationByHandle() failed */
+
 #endif /* VIM__H */