/* * %CopyrightBegin% * * Copyright Ericsson AB 1997-2012. 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); }