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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1997-2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: Provides file and directory operations for Windows.
*/
#include <windows.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include <ctype.h>
#include <wchar.h>
#include "erl_efile.h"
/*
* Microsoft-specific function to map a WIN32 error code to a Posix errno.
*/
#define ISSLASH(a) ((a) == L'\\' || (a) == L'/')
#define ISDIR(st) (((st).st_mode&S_IFMT) == S_IFDIR)
#define ISREG(st) (((st).st_mode&S_IFMT) == S_IFREG)
#define IS_DOT_OR_DOTDOT(s) \
((s)[0] == L'.' && ((s)[1] == L'\0' || ((s)[1] == L'.' && (s)[2] == L'\0')))
#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES ((DWORD) 0xFFFFFFFF)
#endif
#define TICKS_PER_SECOND (10000000ULL)
#define EPOCH_DIFFERENCE (11644473600LL)
#define FILETIME_TO_EPOCH(epoch, ft) \
do { \
ULARGE_INTEGER ull; \
ull.LowPart = (ft).dwLowDateTime; \
ull.HighPart = (ft).dwHighDateTime; \
(epoch) = ((ull.QuadPart / TICKS_PER_SECOND) - EPOCH_DIFFERENCE); \
} while(0)
#define EPOCH_TO_FILETIME(ft, epoch) \
do { \
ULARGE_INTEGER ull; \
ull.QuadPart = (((epoch) + EPOCH_DIFFERENCE) * TICKS_PER_SECOND); \
(ft).dwLowDateTime = ull.LowPart; \
(ft).dwHighDateTime = ull.HighPart; \
} while(0)
static int check_error(int result, Efile_error* errInfo);
static int set_error(Efile_error* errInfo);
static int is_root_unc_name(const WCHAR *path);
static int extract_root(WCHAR *name);
static unsigned short dos_to_posix_mode(int attr, const WCHAR *name);
static int errno_map(DWORD last_error) {
switch (last_error) {
case ERROR_SUCCESS:
return 0;
case ERROR_INVALID_FUNCTION:
case ERROR_INVALID_DATA:
case ERROR_INVALID_PARAMETER:
case ERROR_INVALID_TARGET_HANDLE:
case ERROR_INVALID_CATEGORY:
case ERROR_NEGATIVE_SEEK:
return EINVAL;
case ERROR_DIR_NOT_EMPTY:
return EEXIST;
case ERROR_BAD_FORMAT:
return ENOEXEC;
case ERROR_PATH_NOT_FOUND:
case ERROR_FILE_NOT_FOUND:
case ERROR_NO_MORE_FILES:
return ENOENT;
case ERROR_TOO_MANY_OPEN_FILES:
return EMFILE;
case ERROR_ACCESS_DENIED:
case ERROR_INVALID_ACCESS:
case ERROR_CURRENT_DIRECTORY:
case ERROR_SHARING_VIOLATION:
case ERROR_LOCK_VIOLATION:
case ERROR_INVALID_PASSWORD:
case ERROR_DRIVE_LOCKED:
return EACCES;
case ERROR_INVALID_HANDLE:
return EBADF;
case ERROR_NOT_ENOUGH_MEMORY:
case ERROR_OUTOFMEMORY:
case ERROR_OUT_OF_STRUCTURES:
return ENOMEM;
case ERROR_INVALID_DRIVE:
case ERROR_BAD_UNIT:
case ERROR_NOT_READY:
case ERROR_REM_NOT_LIST:
case ERROR_DUP_NAME:
case ERROR_BAD_NETPATH:
case ERROR_NETWORK_BUSY:
case ERROR_DEV_NOT_EXIST:
case ERROR_BAD_NET_NAME:
return ENXIO;
case ERROR_NOT_SAME_DEVICE:
return EXDEV;
case ERROR_WRITE_PROTECT:
return EROFS;
case ERROR_BAD_LENGTH:
case ERROR_BUFFER_OVERFLOW:
return E2BIG;
case ERROR_SEEK:
case ERROR_SECTOR_NOT_FOUND:
return ESPIPE;
case ERROR_NOT_DOS_DISK:
return ENODEV;
case ERROR_GEN_FAILURE:
return ENODEV;
case ERROR_SHARING_BUFFER_EXCEEDED:
case ERROR_NO_MORE_SEARCH_HANDLES:
return EMFILE;
case ERROR_HANDLE_EOF:
case ERROR_BROKEN_PIPE:
return EPIPE;
case ERROR_HANDLE_DISK_FULL:
case ERROR_DISK_FULL:
return ENOSPC;
case ERROR_NOT_SUPPORTED:
return ENOTSUP;
case ERROR_FILE_EXISTS:
case ERROR_ALREADY_EXISTS:
case ERROR_CANNOT_MAKE:
return EEXIST;
case ERROR_ALREADY_ASSIGNED:
return EBUSY;
case ERROR_NO_PROC_SLOTS:
return EAGAIN;
case ERROR_CANT_RESOLVE_FILENAME:
return EMLINK;
case ERROR_ARENA_TRASHED:
case ERROR_INVALID_BLOCK:
case ERROR_BAD_ENVIRONMENT:
case ERROR_BAD_COMMAND:
case ERROR_CRC:
case ERROR_OUT_OF_PAPER:
case ERROR_READ_FAULT:
case ERROR_WRITE_FAULT:
case ERROR_WRONG_DISK:
case ERROR_NET_WRITE_FAULT:
return EIO;
default: /* not to do with files I expect. */
return EIO;
}
}
static int
check_error(int result, Efile_error* errInfo)
{
if (result < 0) {
errInfo->posix_errno = errno;
errInfo->os_errno = GetLastError();
return 0;
}
return 1;
}
/*
* Fills the provided error information structure with information
* with the error code given by GetLastError() and its corresponding
* Posix error number.
*
* Returns 0.
*/
static int
set_error(Efile_error* errInfo)
{
errInfo->posix_errno = errno_map(errInfo->os_errno = GetLastError());
return 0;
}
/*
* A writev with Unix semantics, but with Windows arguments
*/
static int
win_writev(Efile_error* errInfo,
HANDLE fd, /* handle to file */
FILE_SEGMENT_ELEMENT iov[], /* array of buffer pointers */
DWORD *size) /* number of bytes to write */
{
OVERLAPPED ov;
ov.Offset = 0L;
ov.OffsetHigh = 0L;
ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (ov.hEvent == NULL)
return set_error(errInfo);
if (! write_file_gather(fd, iov, *size, NULL, &ov))
return set_error(errInfo);
if (WaitForSingleObject(ov.hEvent, INFINITE) != WAIT_OBJECT_0)
return set_error(errInfo);
if (! GetOverlappedResult(fd, &ov, size, FALSE))
return set_error(errInfo);
return 1;
}
int
efile_mkdir(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of directory to create. */
{
return check_error(_wmkdir((WCHAR *) name), errInfo);
}
int
efile_rmdir(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of directory to delete. */
{
OSVERSIONINFO os;
DWORD attr;
WCHAR *wname = (WCHAR *) name;
if (RemoveDirectoryW(wname) != FALSE) {
return 1;
}
errno = errno_map(GetLastError());
if (errno == EACCES) {
attr = GetFileAttributesW(wname);
if (attr != (DWORD) -1) {
if ((attr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
/*
* Windows 95 reports calling RemoveDirectory on a file as an
* EACCES, not an ENOTDIR.
*/
errno = ENOTDIR;
goto end;
}
/*
* Windows 95 reports removing a non-empty directory as
* an EACCES, not an EEXIST. If the directory is not empty,
* change errno so caller knows what's going on.
*/
os.dwOSVersionInfoSize = sizeof(os);
GetVersionEx(&os);
if (os.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
HANDLE handle;
WIN32_FIND_DATAW data;
WCHAR buffer[2*MAX_PATH];
int len;
len = wcslen(wname);
wcscpy(buffer, wname);
if (buffer[0] && buffer[len-1] != L'\\' && buffer[len-1] != L'/') {
wcscat(buffer, L"\\");
}
wcscat(buffer, L"*.*");
handle = FindFirstFileW(buffer, &data);
if (handle != INVALID_HANDLE_VALUE) {
while (1) {
if ((wcscmp(data.cFileName, L".") != 0)
&& (wcscmp(data.cFileName, L"..") != 0)) {
/*
* Found something in this directory.
*/
errno = EEXIST;
break;
}
if (FindNextFileW(handle, &data) == FALSE) {
break;
}
}
FindClose(handle);
}
}
}
}
if (errno == ENOTEMPTY) {
/*
* Posix allows both EEXIST or ENOTEMPTY, but we'll always
* return EEXIST to allow easy matching in Erlang code.
*/
errno = EEXIST;
}
end:
return check_error(-1, errInfo);
}
int
efile_delete_file(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of file to delete. */
{
DWORD attr;
WCHAR *wname = (WCHAR *) name;
if (DeleteFileW(wname) != FALSE) {
return 1;
}
errno = errno_map(GetLastError());
if (errno == EACCES) {
attr = GetFileAttributesW(wname);
if (attr != (DWORD) -1) {
if (attr & FILE_ATTRIBUTE_DIRECTORY) {
/*
* Windows NT reports removing a directory as EACCES instead
* of EPERM.
*/
errno = EPERM;
}
}
} else if (errno == ENOENT) {
attr = GetFileAttributesW(wname);
if (attr != (DWORD) -1) {
if (attr & FILE_ATTRIBUTE_DIRECTORY) {
/*
* Windows 95 reports removing a directory as ENOENT instead
* of EPERM.
*/
errno = EPERM;
}
}
} else if (errno == EINVAL) {
/*
* Windows NT reports removing a char device as EINVAL instead of
* EACCES.
*/
errno = EACCES;
}
return check_error(-1, errInfo);
}
/*
*---------------------------------------------------------------------------
*
* Changes the name of an existing file or directory, from src to dst.
* If src and dst refer to the same file or directory, does nothing
* and returns success. Otherwise if dst already exists, it will be
* deleted and replaced by src subject to the following conditions:
* If src is a directory, dst may be an empty directory.
* If src is a file, dst may be a file.
* In any other situation where dst already exists, the rename will
* fail.
*
* Some possible error codes:
*
* EACCES: src or dst parent directory can't be read and/or written.
* EEXIST: dst is a non-empty directory.
* EINVAL: src is a root directory or dst is a subdirectory of src.
* EISDIR: dst is a directory, but src is not.
* ENOENT: src doesn't exist, or src or dst is "".
* ENOTDIR: src is a directory, but dst is not.
* EXDEV: src and dst are on different filesystems.
*
* Side effects:
* The implementation of rename may allow cross-filesystem renames,
* but the caller should be prepared to emulate it with copy and
* delete if errno is EXDEV.
*
*---------------------------------------------------------------------------
*/
int
efile_rename(Efile_error* errInfo, /* Where to return error codes. */
char* src, /* Original name. */
char* dst) /* New name. */
{
DWORD srcAttr, dstAttr;
WCHAR *wsrc = (WCHAR *) src;
WCHAR *wdst = (WCHAR *) dst;
if (MoveFileW(wsrc, wdst) != FALSE) {
return 1;
}
errno = errno_map(GetLastError());
srcAttr = GetFileAttributesW(wsrc);
dstAttr = GetFileAttributesW(wdst);
if (srcAttr == (DWORD) -1) {
srcAttr = 0;
}
if (dstAttr == (DWORD) -1) {
dstAttr = 0;
}
if (errno == EBADF) {
errno = EACCES;
return check_error(-1, errInfo);
}
if (errno == EACCES) {
decode:
if (srcAttr & FILE_ATTRIBUTE_DIRECTORY) {
WCHAR srcPath[MAX_PATH], dstPath[MAX_PATH];
WCHAR *srcRest, *dstRest;
int size;
size = GetFullPathNameW(wsrc, MAX_PATH, srcPath, &srcRest);
if ((size == 0) || (size > MAX_PATH)) {
return check_error(-1, errInfo);
}
size = GetFullPathNameW(wdst, MAX_PATH, dstPath, &dstRest);
if ((size == 0) || (size > MAX_PATH)) {
return check_error(-1, errInfo);
}
if (srcRest == NULL) {
srcRest = srcPath + wcslen(srcPath);
}
if (_wcsnicmp(srcPath, dstPath, srcRest - srcPath) == 0) {
/*
* Trying to move a directory into itself.
*/
errno = EINVAL;
}
if (extract_root(srcPath)) {
/*
* Attempt to move a root directory. Never allowed.
*/
errno = EINVAL;
}
(void) extract_root(dstPath);
if (dstPath[0] == L'\0') {
/*
* The filename was invalid. (Don't know why,
* but play it safe.)
*/
errno = EINVAL;
}
if (_wcsicmp(srcPath, dstPath) != 0) {
/*
* If src is a directory and dst filesystem != src
* filesystem, errno should be EXDEV. It is very
* important to get this behavior, so that the caller
* can respond to a cross filesystem rename by
* simulating it with copy and delete. The MoveFile
* system call already handles the case of moving a
* *file* between filesystems.
*/
errno = EXDEV;
}
}
/*
* Other types of access failure is that dst is a read-only
* filesystem, that an open file referred to src or dest, or that
* src or dest specified the current working directory on the
* current filesystem. EACCES is returned for those cases.
*/
} else if (errno == EEXIST) {
/*
* Reports EEXIST any time the target already exists. If it makes
* sense, remove the old file and try renaming again.
*/
if (srcAttr & FILE_ATTRIBUTE_DIRECTORY) {
if (dstAttr & FILE_ATTRIBUTE_DIRECTORY) {
/*
* Overwrite empty dst directory with src directory. The
* following call will remove an empty directory. If it
* fails, it's because it wasn't empty.
*/
if (RemoveDirectoryW(wdst)) {
/*
* Now that that empty directory is gone, we can try
* renaming again. If that fails, we'll put this empty
* directory back, for completeness.
*/
if (MoveFileW(wsrc, wdst) != FALSE) {
return 1;
}
/*
* Some new error has occurred. Don't know what it
* could be, but report this one.
*/
errno = errno_map(GetLastError());
CreateDirectoryW(wdst, NULL);
SetFileAttributesW(wdst, dstAttr);
if (errno == EACCES) {
/*
* Decode the EACCES to a more meaningful error.
*/
goto decode;
}
}
} else { /* (dstAttr & FILE_ATTRIBUTE_DIRECTORY) == 0 */
errno = ENOTDIR;
}
} else { /* (srcAttr & FILE_ATTRIBUTE_DIRECTORY) == 0 */
if (dstAttr & FILE_ATTRIBUTE_DIRECTORY) {
errno = EISDIR;
} else {
/*
* Overwrite existing file by:
*
* 1. Rename existing file to temp name.
* 2. Rename old file to new name.
* 3. If success, delete temp file. If failure,
* put temp file back to old name.
*/
WCHAR tempName[MAX_PATH];
int result, size;
WCHAR *rest;
size = GetFullPathNameW(wdst, MAX_PATH, tempName, &rest);
if ((size == 0) || (size > MAX_PATH) || (rest == NULL)) {
return check_error(-1, errInfo);
}
*rest = L'\0';
result = -1;
if (GetTempFileNameW(tempName, L"erlr", 0, tempName) != 0) {
/*
* Strictly speaking, need the following DeleteFile and
* MoveFile to be joined as an atomic operation so no
* other app comes along in the meantime and creates the
* same temp file.
*/
DeleteFileW(tempName);
if (MoveFileW(wdst, tempName) != FALSE) {
if (MoveFileW(wsrc, wdst) != FALSE) {
SetFileAttributesW(tempName, FILE_ATTRIBUTE_NORMAL);
DeleteFileW(tempName);
return 1;
} else {
DeleteFileW(wdst);
MoveFileW(tempName, wdst);
}
}
/*
* Can't backup dst file or move src file. Return that
* error. Could happen if an open file refers to dst.
*/
errno = errno_map(GetLastError());
if (errno == EACCES) {
/*
* Decode the EACCES to a more meaningful error.
*/
goto decode;
}
}
return result;
}
}
}
return check_error(-1, errInfo);
}
int
efile_chdir(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of directory to make current. */
{
int success = check_error(_wchdir((WCHAR *) name), errInfo);
if (!success && errInfo->posix_errno == EINVAL)
/* POSIXification of errno */
errInfo->posix_errno = ENOENT;
return success;
}
int
efile_getdcwd(Efile_error* errInfo, /* Where to return error codes. */
int drive, /* 0 - current, 1 - A, 2 - B etc. */
char* buffer, /* Where to return the current directory. */
size_t size) /* Size of buffer. */
{
WCHAR *wbuffer = (WCHAR *) buffer;
size_t wbuffer_size = size / 2;
if (_wgetdcwd(drive, wbuffer, wbuffer_size) == NULL)
return check_error(-1, errInfo);
for ( ; *wbuffer; wbuffer++)
if (*wbuffer == L'\\')
*wbuffer = L'/';
return 1;
}
int
efile_readdir(Efile_error* errInfo, /* Where to return error codes. */
char* name, /* Name of directory to list */
EFILE_DIR_HANDLE* dir_handle, /* Handle of opened directory or NULL */
char* buffer, /* Buffer to put one filename in */
size_t *size) /* in-out size of buffer/size of filename excluding zero
termination in bytes*/
{
HANDLE dir; /* Handle to directory. */
WCHAR wildcard[MAX_PATH]; /* Wildcard to search for. */
WIN32_FIND_DATAW findData; /* Data found by FindFirstFile() or FindNext(). */
/* Alignment is not honored, this works on x86 because of alignment fixup by processor.
Not perfect, but faster than alinging by hand (really) */
WCHAR *wname = (WCHAR *) name;
WCHAR *wbuffer = (WCHAR *) buffer;
/*
* First time we must setup everything.
*/
if (*dir_handle == NULL) {
int length = wcslen(wname);
WCHAR* s;
if (length+3 >= MAX_PATH) {
errno = ENAMETOOLONG;
return check_error(-1, errInfo);
}
wcscpy(wildcard, wname);
s = wildcard+length-1;
if (*s != L'/' && *s != L'\\')
*++s = L'\\';
*++s = L'*';
*++s = L'\0';
DEBUGF(("Reading %ws\n", wildcard));
dir = FindFirstFileW(wildcard, &findData);
if (dir == INVALID_HANDLE_VALUE)
return set_error(errInfo);
*dir_handle = (EFILE_DIR_HANDLE) dir;
if (!IS_DOT_OR_DOTDOT(findData.cFileName)) {
wcscpy(wbuffer, findData.cFileName);
*size = wcslen(wbuffer)*2;
return 1;
}
}
/*
* Retrieve the name of the next file using the directory handle.
*/
dir = (HANDLE) *dir_handle;
for (;;) {
if (FindNextFileW(dir, &findData)) {
if (IS_DOT_OR_DOTDOT(findData.cFileName))
continue;
wcscpy(wbuffer, findData.cFileName);
*size = wcslen(wbuffer)*2;
return 1;
}
if (GetLastError() == ERROR_NO_MORE_FILES) {
FindClose(dir);
errInfo->posix_errno = errInfo->os_errno = 0;
return 0;
}
set_error(errInfo);
FindClose(dir);
return 0;
}
}
int
efile_openfile(Efile_error* errInfo, /* Where to return error codes. */
char* name, /* Name of directory to open. */
int flags, /* Flags to use for opening. */
int* pfd, /* Where to store the file descriptor. */
Sint64* pSize) /* Where to store the size of the file. */
{
BY_HANDLE_FILE_INFORMATION fileInfo; /* File information from a handle. */
HANDLE fd; /* Handle to open file. */
DWORD access; /* Access mode: GENERIC_READ, GENERIC_WRITE. */
DWORD crFlags;
WCHAR *wname = (WCHAR *) name;
switch (flags & (EFILE_MODE_READ|EFILE_MODE_WRITE)) {
case EFILE_MODE_READ:
access = GENERIC_READ;
crFlags = OPEN_EXISTING;
break;
case EFILE_MODE_WRITE:
access = GENERIC_WRITE;
crFlags = CREATE_ALWAYS;
break;
case EFILE_MODE_READ_WRITE:
access = GENERIC_READ|GENERIC_WRITE;
crFlags = OPEN_ALWAYS;
break;
default:
errno = EINVAL;
check_error(-1, errInfo);
return 0;
}
if (flags & EFILE_MODE_APPEND) {
crFlags = OPEN_ALWAYS;
}
if (flags & EFILE_MODE_EXCL) {
crFlags = CREATE_NEW;
}
fd = CreateFileW(wname, access,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL, crFlags, FILE_ATTRIBUTE_NORMAL, NULL);
/*
* Check for errors.
*/
if (fd == INVALID_HANDLE_VALUE) {
DWORD attr;
set_error(errInfo);
/*
* If the error is EACESS, the reason could be that we tried to
* open a directory. In that case, we'll change the error code
* to EISDIR.
*/
if (errInfo->posix_errno &&
(attr = GetFileAttributesW(wname)) != INVALID_FILE_ATTRIBUTES &&
(attr & FILE_ATTRIBUTE_DIRECTORY)) {
errInfo->posix_errno = EISDIR;
}
return 0;
}
/*
* Get and return the length of the open file.
*/
if (!GetFileInformationByHandle(fd, &fileInfo))
return set_error(errInfo);
*pfd = (int) fd;
if (pSize) {
*pSize = (Sint64)
(((Uint64)fileInfo.nFileSizeHigh << 32) |
(Uint64)fileInfo.nFileSizeLow);
}
return 1;
}
int
efile_may_openfile(Efile_error* errInfo, char *name) {
WCHAR *wname = (WCHAR *) name;
DWORD attr;
if ((attr = GetFileAttributesW(wname)) == INVALID_FILE_ATTRIBUTES) {
return check_error(-1, errInfo);
}
if (attr & FILE_ATTRIBUTE_DIRECTORY) {
errno = EISDIR;
return check_error(-1, errInfo);
}
return 1;
}
void
efile_closefile(fd)
int fd; /* File descriptor for file to close. */
{
CloseHandle((HANDLE) fd);
}
int
efile_fdatasync(errInfo, fd)
Efile_error* errInfo; /* Where to return error codes. */
int fd; /* File descriptor for file to sync. */
{
/* Not available in Windows, just call regular fsync */
return efile_fsync(errInfo, fd);
}
int
efile_fsync(errInfo, fd)
Efile_error* errInfo; /* Where to return error codes. */
int fd; /* File descriptor for file to sync. */
{
if (!FlushFileBuffers((HANDLE) fd)) {
return check_error(-1, errInfo);
}
return 1;
}
int
efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo,
char* orig_name, int info_for_link)
{
HANDLE findhandle; /* Handle returned by FindFirstFile(). */
WIN32_FIND_DATAW findbuf; /* Data return by FindFirstFile(). */
WCHAR name[_MAX_PATH];
int name_len;
WCHAR *path;
WCHAR pathbuf[_MAX_PATH];
int drive; /* Drive for filename (1 = A:, 2 = B: etc). */
WCHAR *worig_name = (WCHAR *) orig_name;
/* Don't allow wildcards to be interpreted by system */
if (wcspbrk(worig_name, L"?*")) {
enoent:
errInfo->posix_errno = ENOENT;
errInfo->os_errno = ERROR_FILE_NOT_FOUND;
return 0;
}
/*
* Move the name to a buffer and make sure to remove a trailing
* slash, because it causes FindFirstFile() to fail on Win95.
*/
if ((name_len = wcslen(worig_name)) >= _MAX_PATH) {
goto enoent;
} else {
wcscpy(name, worig_name);
if (name_len > 2 && ISSLASH(name[name_len-1]) &&
name[name_len-2] != L':') {
name[name_len-1] = L'\0';
}
}
/* Try to get disk from name. If none, get current disk. */
if (name[1] != L':') {
drive = 0;
if (GetCurrentDirectoryW(_MAX_PATH, pathbuf) &&
pathbuf[1] == L':') {
drive = towlower(pathbuf[0]) - L'a' + 1;
}
} else if (*name && name[2] == L'\0') {
/*
* X: and nothing more is an error.
*/
errInfo->posix_errno = ENOENT;
errInfo->os_errno = ERROR_FILE_NOT_FOUND;
return 0;
} else
drive = towlower(*name) - L'a' + 1;
findhandle = FindFirstFileW(name, &findbuf);
if (findhandle == INVALID_HANDLE_VALUE) {
if (!(wcspbrk(name, L"./\\") &&
(path = _wfullpath(pathbuf, name, _MAX_PATH)) &&
/* root dir. ('C:\') or UNC root dir. ('\\server\share\') */
((wcslen(path) == 3) || is_root_unc_name(path)) &&
(GetDriveTypeW(path) > 1) ) ) {
errInfo->posix_errno = ENOENT;
errInfo->os_errno = ERROR_FILE_NOT_FOUND;
return 0;
}
/*
* Root directories (such as C:\ or \\server\share\ are fabricated.
*/
findbuf.dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY;
findbuf.nFileSizeHigh = 0;
findbuf.nFileSizeLow = 0;
findbuf.cFileName[0] = L'\0';
pInfo->links = 1;
pInfo->cTime = pInfo->accessTime = pInfo->modifyTime = 0;
} else {
SYSTEMTIME SystemTime;
FILETIME LocalFTime;
/*first check if we are a symlink */
if (!info_for_link && (findbuf.dwFileAttributes &
FILE_ATTRIBUTE_REPARSE_POINT)){
/*
* given that we know this is a symlink,
we should be able to find its target */
WCHAR target_name[_MAX_PATH];
if (efile_readlink(errInfo, (char *) name,
(char *) target_name,
_MAX_PATH * sizeof(WCHAR)) == 1) {
FindClose(findhandle);
return efile_fileinfo(errInfo, pInfo,
(char *) target_name, info_for_link);
}
}
/* number of links: */
{
HANDLE handle; /* Handle returned by CreateFile() */
BY_HANDLE_FILE_INFORMATION fileInfo; /* from CreateFile() */
if (handle = CreateFileW(name, GENERIC_READ, 0,NULL,
OPEN_EXISTING, 0, NULL)) {
GetFileInformationByHandle(handle, &fileInfo);
pInfo->links = fileInfo.nNumberOfLinks;
CloseHandle(handle);
} else {
pInfo->links = 1;
}
}
FILETIME_TO_EPOCH(pInfo->modifyTime, findbuf.ftLastWriteTime);
if (findbuf.ftLastAccessTime.dwLowDateTime == 0 &&
findbuf.ftLastAccessTime.dwHighDateTime == 0) {
pInfo->accessTime = pInfo->modifyTime;
} else {
FILETIME_TO_EPOCH(pInfo->accessTime, findbuf.ftLastAccessTime);
}
if (findbuf.ftCreationTime.dwLowDateTime == 0 &&
findbuf.ftCreationTime.dwHighDateTime == 0) {
pInfo->cTime = pInfo->modifyTime;
} else {
FILETIME_TO_EPOCH(pInfo->cTime ,findbuf.ftCreationTime);
}
FindClose(findhandle);
}
pInfo->size_low = findbuf.nFileSizeLow;
pInfo->size_high = findbuf.nFileSizeHigh;
if (info_for_link && (findbuf.dwFileAttributes &
FILE_ATTRIBUTE_REPARSE_POINT))
pInfo->type = FT_SYMLINK;
else if (findbuf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
pInfo->type = FT_DIRECTORY;
else
pInfo->type = FT_REGULAR;
if (findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
pInfo->access = FA_READ;
else
pInfo->access = FA_READ|FA_WRITE;
pInfo->mode = dos_to_posix_mode(findbuf.dwFileAttributes, name);
pInfo->major_device = drive;
pInfo->minor_device = 0;
pInfo->inode = 0;
pInfo->uid = 0;
pInfo->gid = 0;
return 1;
}
int
efile_write_info(Efile_error* errInfo,
Efile_info* pInfo,
char* name)
{
SYSTEMTIME timebuf;
FILETIME ModifyFileTime;
FILETIME AccessFileTime;
FILETIME CreationFileTime;
HANDLE fd;
DWORD attr;
DWORD tempAttr;
WCHAR *wname = (WCHAR *) name;
/*
* Get the attributes for the file.
*/
tempAttr = attr = GetFileAttributesW(wname);
if (attr == 0xffffffff) {
return set_error(errInfo);
}
if (pInfo->mode != -1) {
if (pInfo->mode & _S_IWRITE) {
/* clear read only bit */
attr &= ~FILE_ATTRIBUTE_READONLY;
} else {
/* set read only bit */
attr |= FILE_ATTRIBUTE_READONLY;
}
}
/*
* Construct all file times.
*/
EPOCH_TO_FILETIME(ModifyFileTime, pInfo->modifyTime);
EPOCH_TO_FILETIME(AccessFileTime, pInfo->accessTime);
EPOCH_TO_FILETIME(CreationFileTime, pInfo->cTime);
/*
* If necessary, set the file times.
*/
/*
* If the has read only access, we must temporarily turn on
* write access (this is necessary for native filesystems,
* but not for NFS filesystems).
*/
if (tempAttr & FILE_ATTRIBUTE_READONLY) {
tempAttr &= ~FILE_ATTRIBUTE_READONLY;
if (!SetFileAttributesW(wname, tempAttr)) {
return set_error(errInfo);
}
}
fd = CreateFileW(wname, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (fd != INVALID_HANDLE_VALUE) {
BOOL result = SetFileTime(fd, &CreationFileTime, &AccessFileTime, &ModifyFileTime);
if (!result) {
return set_error(errInfo);
}
CloseHandle(fd);
}
/*
* If the file doesn't have the correct attributes, set them now.
* (It could have been done before setting the file times, above).
*/
if (tempAttr != attr) {
if (!SetFileAttributesW(wname, attr)) {
return set_error(errInfo);
}
}
return 1;
}
int
efile_pwrite(errInfo, fd, buf, count, offset)
Efile_error* errInfo; /* Where to return error codes. */
int fd; /* File descriptor to write to. */
char* buf; /* Buffer to write. */
size_t count; /* Number of bytes to write. */
Sint64 offset; /* where to write it */
{
int res = efile_seek(errInfo, fd, offset, EFILE_SEEK_SET, NULL);
if (res) {
return efile_write(errInfo, EFILE_MODE_WRITE, fd, buf, count);
} else {
return res;
}
}
/* position and read/write as a single atomic op */
int
efile_pread(errInfo, fd, offset, buf, count, pBytesRead)
Efile_error* errInfo; /* Where to return error codes. */
int fd; /* File descriptor to read from. */
Sint64 offset; /* Offset in bytes from BOF. */
char* buf; /* Buffer to read into. */
size_t count; /* Number of bytes to read. */
size_t* pBytesRead; /* Where to return number of bytes read. */
{
int res = efile_seek(errInfo, fd, offset, EFILE_SEEK_SET, NULL);
if (res) {
return efile_read(errInfo, EFILE_MODE_READ, fd, buf, count, pBytesRead);
} else {
return res;
}
}
int
efile_write(errInfo, flags, fd, buf, count)
Efile_error* errInfo; /* Where to return error codes. */
int flags; /* Flags given when file was opened. */
int fd; /* File descriptor to write to. */
char* buf; /* Buffer to write. */
size_t count; /* Number of bytes to write. */
{
DWORD written; /* Bytes written in last operation. */
OVERLAPPED overlapped;
OVERLAPPED* pOverlapped = NULL;
if (flags & EFILE_MODE_APPEND) {
memset(&overlapped, 0, sizeof(overlapped));
overlapped.Offset = 0xffffffff;
overlapped.OffsetHigh = 0xffffffff;
pOverlapped = &overlapped;
}
while (count > 0) {
if (!WriteFile((HANDLE) fd, buf, count, &written, pOverlapped))
return set_error(errInfo);
buf += written;
count -= written;
}
return 1;
}
int
efile_writev(Efile_error* errInfo, /* Where to return error codes */
int flags, /* Flags given when file was
* opened */
int fd, /* File descriptor to write to */
SysIOVec* iov, /* Vector of buffer structs.
* The structs are unchanged
* after the call */
int iovcnt) /* Number of structs in vector */
{
int cnt; /* Buffers so far written */
OVERLAPPED overlapped;
OVERLAPPED* pOverlapped = NULL;
ASSERT(iovcnt >= 0);
if (flags & EFILE_MODE_APPEND) {
memset(&overlapped, 0, sizeof(overlapped));
overlapped.Offset = 0xffffffff;
overlapped.OffsetHigh = 0xffffffff;
pOverlapped = &overlapped;
}
for (cnt = 0; cnt < iovcnt; cnt++) {
if (iov[cnt].iov_base && iov[cnt].iov_len > 0) {
/* Non-empty buffer */
int p; /* Position in buffer */
int w = iov[cnt].iov_len;/* Bytes written in this call */
for (p = 0; p < iov[cnt].iov_len; p += w) {
if (!WriteFile((HANDLE) fd,
iov[cnt].iov_base + p,
iov[cnt].iov_len - p,
&w,
pOverlapped))
return set_error(errInfo);
}
}
}
return 1;
}
int
efile_read(errInfo, flags, fd, buf, count, pBytesRead)
Efile_error* errInfo; /* Where to return error codes. */
int flags; /* Flags given when file was opened. */
int fd; /* File descriptor to read from. */
char* buf; /* Buffer to read into. */
size_t count; /* Number of bytes to read. */
size_t* pBytesRead; /* Where to return number of bytes read. */
{
if (!ReadFile((HANDLE) fd, buf, count, (DWORD *) pBytesRead, NULL))
return set_error(errInfo);
return 1;
}
int
efile_seek(errInfo, fd, offset, origin, new_location)
Efile_error* errInfo; /* Where to return error codes. */
int fd; /* File descriptor to do the seek on. */
Sint64 offset; /* Offset in bytes from the given origin. */
int origin; /* Origin of seek (SEEK_SET, SEEK_CUR,
* SEEK_END).
*/
Sint64* new_location; /* Resulting new location in file. */
{
LARGE_INTEGER off, new_loc;
switch (origin) {
case EFILE_SEEK_SET: origin = FILE_BEGIN; break;
case EFILE_SEEK_CUR: origin = FILE_CURRENT; break;
case EFILE_SEEK_END: origin = FILE_END; break;
default:
errno = EINVAL;
check_error(-1, errInfo);
break;
}
off.QuadPart = offset;
if (! SetFilePointerEx((HANDLE) fd, off,
new_location ? &new_loc : NULL, origin)) {
return set_error(errInfo);
}
if (new_location) {
*new_location = new_loc.QuadPart;
DEBUGF(("efile_seek(offset=%ld, origin=%d) -> %ld\n",
(long) offset, origin, (long) *new_location));
} else {
DEBUGF(("efile_seek(offset=%ld, origin=%d)\n", (long) offset, origin));
}
return 1;
}
int
efile_truncate_file(errInfo, fd, flags)
Efile_error* errInfo; /* Where to return error codes. */
int *fd; /* File descriptor for file to truncate. */
int flags;
{
if (!SetEndOfFile((HANDLE) (*fd)))
return set_error(errInfo);
return 1;
}
/*
* is_root_unc_name - returns TRUE if the argument is a UNC name specifying
* a root share. That is, if it is of the form \\server\share\.
* This routine will also return true if the argument is of the
* form \\server\share (no trailing slash) but Win32 currently
* does not like that form.
*
* Forward slashes ('/') may be used instead of backslashes ('\').
*/
static int
is_root_unc_name(const WCHAR *path)
{
/*
* If a root UNC name, path will start with 2 (but not 3) slashes
*/
if ((wcslen(path) >= 5) /* minimum string is "//x/y" */
&& ISSLASH(path[0]) && ISSLASH(path[1]))
{
const WCHAR *p = path + 2;
/*
* find the slash between the server name and share name
*/
while ( * ++ p )
if ( ISSLASH(*p) )
break ;
if ( *p && p[1] )
{
/*
* is there a further slash?
*/
while ( * ++ p )
if ( ISSLASH(*p) )
break ;
/*
* just final slash (or no final slash)
*/
if ( !*p || !p[1])
return 1;
}
}
return 0 ;
}
/*
* Extracts the root part of an absolute filename (by modifying the string
* pointed to by the name argument). The name can start
* with either a driver letter (for example, C:\), or a UNC name
* (for example, \\guinness\bjorn).
*
* If the name is invalid, the buffer will be modified to point to
* an empty string.
*
* Returns: 1 if the name consists of just the root part, 0 if
* the name was longer.
*/
static int
extract_root(WCHAR* name)
{
int len = wcslen(name);
if (iswalpha(name[0]) && name[1] == L':' && ISSLASH(name[2])) {
WCHAR c = name[3];
name[3] = L'\0';
return c == L'\0';
} else if (len < 5 || !ISSLASH(name[0]) || !ISSLASH(name[1])) {
goto error;
} else { /* Try to find the end of the UNC name. */
WCHAR* p;
WCHAR c;
/*
* Find the slash between the server name and share name.
*/
for (p = name + 2; *p; p++)
if (ISSLASH(*p))
break;
if (*p == L'\0')
goto error;
/*
* Find the slash after the share name.
*/
for (p++; *p; p++)
if (ISSLASH(*p))
break;
c = *p;
*p = L'\0';
return c == L'\0' || p[1] == L'\0';
}
error:
*name = L'\0';
return 1;
}
static unsigned short
dos_to_posix_mode(int attr, const WCHAR *name)
{
register unsigned short uxmode;
unsigned dosmode;
register const WCHAR *p;
dosmode = attr & 0xff;
if ((p = name)[1] == L':')
p += 2;
/* check to see if this is a directory - note we must make a special
* check for the root, which DOS thinks is not a directory
*/
uxmode = (unsigned short)
(((ISSLASH(*p) && !p[1]) || (dosmode & FILE_ATTRIBUTE_DIRECTORY) ||
*p == L'\0') ? _S_IFDIR|_S_IEXEC : _S_IFREG);
/* If attribute byte does not have read-only bit, it is read-write */
uxmode |= (dosmode & FILE_ATTRIBUTE_READONLY) ?
_S_IREAD : (_S_IREAD|_S_IWRITE);
/* see if file appears to be executable - check extension of name */
if (p = wcsrchr(name, L'.')) {
if (!_wcsicmp(p, L".exe") ||
!_wcsicmp(p, L".cmd") ||
!_wcsicmp(p, L".bat") ||
!_wcsicmp(p, L".com"))
uxmode |= _S_IEXEC;
}
/* propagate user read/write/execute bits to group/other fields */
uxmode |= (uxmode & 0700) >> 3;
uxmode |= (uxmode & 0700) >> 6;
return uxmode;
}
int
efile_readlink(Efile_error* errInfo, char* name, char* buffer, size_t size)
{
/*
* load dll and see if we have CreateSymbolicLink at runtime:
* (Vista only)
*/
HINSTANCE hModule = NULL;
WCHAR *wname = (WCHAR *) name;
WCHAR *wbuffer = (WCHAR *) buffer;
if ((hModule = LoadLibrary("kernel32.dll")) != NULL) {
typedef DWORD (WINAPI * GETFINALPATHNAMEBYHANDLEPTR)(
HANDLE hFile,
LPCWSTR lpFilePath,
DWORD cchFilePath,
DWORD dwFlags);
GETFINALPATHNAMEBYHANDLEPTR pGetFinalPathNameByHandle =
(GETFINALPATHNAMEBYHANDLEPTR)GetProcAddress(hModule, "GetFinalPathNameByHandleW");
if (pGetFinalPathNameByHandle == NULL) {
FreeLibrary(hModule);
} else {
/* first check if file is a symlink; {error, einval} otherwise */
DWORD fileAttributes = GetFileAttributesW(wname);
if ((fileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
BOOLEAN success = 0;
HANDLE h = CreateFileW(wname, GENERIC_READ, 0,NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
int len;
if(h != INVALID_HANDLE_VALUE) {
success = pGetFinalPathNameByHandle(h, wbuffer, size / sizeof(WCHAR),0);
/* GetFinalPathNameByHandle prepends path with "\\?\": */
len = wcslen(wbuffer);
wmemmove(wbuffer,wbuffer+4,len-3);
if (len - 4 >= 2 && wbuffer[1] == L':' && wbuffer[0] >= L'A' &&
wbuffer[0] <= L'Z') {
wbuffer[0] = wbuffer[0] + L'a' - L'A';
}
for ( ; *wbuffer; wbuffer++)
if (*wbuffer == L'\\')
*wbuffer = L'/';
CloseHandle(h);
}
FreeLibrary(hModule);
if (success) {
return 1;
} else {
return set_error(errInfo);
}
} else {
FreeLibrary(hModule);
errno = EINVAL;
return check_error(-1, errInfo);
}
}
}
errno = ENOTSUP;
return check_error(-1, errInfo);
}
int
efile_altname(Efile_error* errInfo, char* orig_name, char* buffer, size_t size)
{
WIN32_FIND_DATAW wfd;
HANDLE fh;
WCHAR name[_MAX_PATH+1];
int name_len;
WCHAR* path;
WCHAR pathbuf[_MAX_PATH+1]; /* Unclear weather GetCurrentDirectory will access one char after
_MAX_PATH */
WCHAR *worig_name = (WCHAR *) orig_name;
WCHAR *wbuffer = (WCHAR *) buffer;
int drive; /* Drive for filename (1 = A:, 2 = B: etc). */
/* Don't allow wildcards to be interpreted by system */
if (wcspbrk(worig_name, L"?*")) {
enoent:
errInfo->posix_errno = ENOENT;
errInfo->os_errno = ERROR_FILE_NOT_FOUND;
return 0;
}
/*
* Move the name to a buffer and make sure to remove a trailing
* slash, because it causes FindFirstFile() to fail on Win95.
*/
if ((name_len = wcslen(worig_name)) >= _MAX_PATH) {
goto enoent;
} else {
wcscpy(name, worig_name);
if (name_len > 2 && ISSLASH(name[name_len-1]) &&
name[name_len-2] != L':') {
name[name_len-1] = L'\0';
}
}
/* Try to get disk from name. If none, get current disk. */
if (name[1] != L':') {
drive = 0;
if (GetCurrentDirectoryW(_MAX_PATH, pathbuf) &&
pathbuf[1] == L':') {
drive = towlower(pathbuf[0]) - L'a' + 1;
}
} else if (*name && name[2] == L'\0') {
/*
* X: and nothing more is an error.
*/
goto enoent;
} else {
drive = towlower(*name) - L'a' + 1;
}
fh = FindFirstFileW(name,&wfd);
if (fh == INVALID_HANDLE_VALUE) {
if (!(wcspbrk(name, L"./\\") &&
(path = _wfullpath(pathbuf, name, _MAX_PATH)) &&
/* root dir. ('C:\') or UNC root dir. ('\\server\share\') */
((wcslen(path) == 3) || is_root_unc_name(path)) &&
(GetDriveTypeW(path) > 1) ) ) {
errno = errno_map(GetLastError());
return check_error(-1, errInfo);
}
/*
* Root directories (such as C:\ or \\server\share\ are fabricated.
*/
wcscpy(wbuffer,name);
return 1;
}
wcscpy(wbuffer,wfd.cAlternateFileName);
if (!*wbuffer) {
wcscpy(wbuffer,wfd.cFileName);
}
FindClose(fh);
return 1;
}
int
efile_link(Efile_error* errInfo, char* old, char* new)
{
WCHAR *wold = (WCHAR *) old;
WCHAR *wnew = (WCHAR *) new;
if(!CreateHardLinkW(wnew, wold, NULL)) {
return set_error(errInfo);
}
return 1;
}
int
efile_symlink(Efile_error* errInfo, char* old, char* new)
{
/*
* Load dll and see if we have CreateSymbolicLink at runtime:
* (Vista only)
*/
HINSTANCE hModule = NULL;
WCHAR *wold = (WCHAR *) old;
WCHAR *wnew = (WCHAR *) new;
if ((hModule = LoadLibrary("kernel32.dll")) != NULL) {
typedef BOOLEAN (WINAPI * CREATESYMBOLICLINKFUNCPTR) (
LPCWSTR lpSymlinkFileName,
LPCWSTR lpTargetFileName,
DWORD dwFlags);
CREATESYMBOLICLINKFUNCPTR pCreateSymbolicLink =
(CREATESYMBOLICLINKFUNCPTR) GetProcAddress(hModule,
"CreateSymbolicLinkW");
/* A for MBCS, W for UNICODE... char* above implies 'W'! */
if (pCreateSymbolicLink != NULL) {
DWORD attr = GetFileAttributesW(wold);
int flag = (attr != INVALID_FILE_ATTRIBUTES &&
attr & FILE_ATTRIBUTE_DIRECTORY) ? 1 : 0;
/* SYMBOLIC_LINK_FLAG_DIRECTORY = 1 */
BOOLEAN success = pCreateSymbolicLink(wnew, wold, flag);
FreeLibrary(hModule);
if (success) {
return 1;
} else {
return set_error(errInfo);
}
} else
FreeLibrary(hModule);
}
errno = ENOTSUP;
return check_error(-1, errInfo);
}
int
efile_fadvise(Efile_error* errInfo, int fd, Sint64 offset,
Sint64 length, int advise)
{
/* posix_fadvise is not available on Windows, do nothing */
errno = ERROR_SUCCESS;
return check_error(0, errInfo);
}
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