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updated for version 7.3.172

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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)
This commit is contained in:
Bram Moolenaar
2011-05-05 16:41:24 +02:00
parent 85de20665f
commit 1c32dff7d6
6 changed files with 59 additions and 20 deletions
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40
src/os_win32.c
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@@ -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);
}