0001-Windows-better-stat-implementation.patch

From 3af75514d92c4fb0e9608ff66584f3ddd52adf8d Mon Sep 17 00:00:00 2001
From: Bert Belder <bertbelder@gmail.com>
Date: Thu, 2 Feb 2012 16:23:57 +0100
Subject: [PATCH 1/1] Windows: better stat implementation

---
 src/win/fs.c   |  184 ++++++++-----------------------------------------------
 test/test-fs.c |   13 ++++
 2 files changed, 40 insertions(+), 157 deletions(-)

diff --git a/src/win/fs.c b/src/win/fs.c
index 5248ac2..12ad514 100644
--- a/src/win/fs.c
+++ b/src/win/fs.c
@@ -489,191 +489,61 @@ void fs__readdir(uv_fs_t* req, const wchar_t* path, int flags) {
 }
 
 
-#define IS_SLASH(c) \
-  ((wchar_t) c == L'/' || (wchar_t) c == L'\\')
-#define IS_COLON(c) \
-  ((wchar_t) c == L':')
-#define IS_LETTER(c) \
-  ((((wchar_t) c >= L'a') && ((wchar_t) c <= L'z')) || \
-   (((wchar_t) c >= L'A') && ((wchar_t) c <= L'Z')))
-#define IS_QUESTION(c) \
-  ((wchar_t) c == L'?')
-
-
-static int uv__count_slash_separated_words(const wchar_t* pos,
-                                           const wchar_t* end,
-                                           int limit) {
-  char last_was_slash = 1, count = 0;
-
-  for (; pos < end; pos++) {
-    if (IS_SLASH(*pos)) {
-      /* Don't accept double slashes */
-      if (last_was_slash) {
-        return 0;
-      } else {
-        last_was_slash = 1;
-      }
-    } else {
-      if (last_was_slash) {
-        /* Found a new word */
-        count++;
-        if (count > limit) {
-          return -1;
-        }
-        last_was_slash = 0;
-      }
-    }
-  }
-
-  return count;
-}
-
-/*
- * Returns true if the given path is a root directory. The following patterns
- * are recognized:
- * \
- * c:\ (must have trailing slash)
- * \\server\share (trailing slash optional)
- * \\?\c: (trailing slash optional)
- * \\?\UNC\server\share (trailing slash optional)
- */
-static int uv__is_root(const wchar_t* path) {
-  size_t len = wcslen(path);
-
-  /* Test for \ */
-  if (len == 1 && IS_SLASH(path[0])) {
-    return 1;
-  }
-
-  if (len < 3) {
-    return 0;
-  }
-
-  /* Test for c:\ */
-  if (IS_LETTER(path[0]) && IS_COLON(path[1]) && IS_SLASH(path[2])) {
-    return 1;
-  }
-
-  if (!IS_SLASH(path[0]) || !IS_SLASH(path[1])) {
-    return 0;
-  }
-
-  /* Test for \\server\share */
-  if (!IS_QUESTION(path[2])) {
-    return uv__count_slash_separated_words(path + 2, path + len, 2) == 2;
-  }
-
-  if (!IS_SLASH(path[3])) {
-    return 0;
-  }
-
-  if ((len == 6 || len == 7) &&
-      IS_LETTER(path[4]) && IS_COLON(path[5]) &&
-      (len == 6 || IS_SLASH(path[6]))) {
-    return 1;
-  }
-
-  /* Test for \\?\UNC\server\share */
-  if (len >= 8 &&
-      (path[4] == L'u' || path[4] == L'U') &&
-      (path[5] == L'n' || path[5] == L'N') &&
-      (path[6] == L'c' || path[6] == L'C') &&
-      IS_SLASH(path[7])) {
-    return uv__count_slash_separated_words(path + 8, path + len, 2) == 2;
-  }
-
-  return 0;
-}
-
-
-void fs__stat(uv_fs_t* req, const wchar_t* path) {
-  HANDLE file;
-  WIN32_FIND_DATAW ent;
+static void fs__stat(uv_fs_t* req, const wchar_t* path) {
+  HANDLE handle;
   int result;
+  BY_HANDLE_FILE_INFORMATION info;
 
   req->ptr = NULL;
 
-  if (uv__is_root(path)) {
-    /* We can't stat root directories like c:\. _wstati64 can't either, but */
-    /* it will make up something reasonable. */
-    DWORD drive_type = GetDriveTypeW(path);
-    if (drive_type == DRIVE_UNKNOWN || drive_type == DRIVE_NO_ROOT_DIR) {
-      req->last_error = ERROR_PATH_NOT_FOUND;
-      req->errorno = UV_ENOENT;
-      req->result = -1;
-      return;
-    }
-
-    memset(&req->stat, 0, sizeof req->stat);
-
-    req->stat.st_nlink = 1;
-    req->stat.st_mode = ((_S_IREAD|_S_IWRITE) + ((_S_IREAD|_S_IWRITE) >> 3) +
-        ((_S_IREAD|_S_IWRITE) >> 6)) | S_IFDIR;
-
-    req->last_error = ERROR_SUCCESS;
-    req->errorno = UV_OK;
-    req->result = 0;
-    req->ptr = &req->stat;
+  handle = CreateFileW(path,
+                       FILE_READ_ATTRIBUTES,
+                       FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                       NULL,
+                       OPEN_EXISTING,
+                       FILE_FLAG_BACKUP_SEMANTICS,
+                       NULL);
+  if (handle == INVALID_HANDLE_VALUE) {
+    SET_REQ_RESULT_WIN32_ERROR(req, GetLastError());
     return;
   }
 
-  file = FindFirstFileExW(path, FindExInfoStandard, &ent,
-    FindExSearchNameMatch, NULL, 0);
-
-  if (file == INVALID_HANDLE_VALUE) {
+  if (!GetFileInformationByHandle(handle, &info)) {
     SET_REQ_RESULT_WIN32_ERROR(req, GetLastError());
+    CloseHandle(handle);
     return;
   }
 
-  FindClose(file);
-
-  if (ent.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT &&
-      ent.dwReserved0 == IO_REPARSE_TAG_SYMLINK) {
-    fs__open(req, path, _O_RDONLY, 0);
-    if (req->result != -1) {
-      result = _fstati64(req->result, &req->stat);
-      _close(req->result);
-
-      if (result != -1) {
-        req->ptr = &req->stat;
-      }
-
-      SET_REQ_RESULT(req, result);
-    }
+  memset(&req->stat, 0, sizeof req->stat);
 
-    return;
-  }
+  /* TODO: set st_dev and st_ino? */
 
-  req->stat.st_ino = 0;
-  req->stat.st_uid = 0;
-  req->stat.st_gid = 0;
-  req->stat.st_mode = 0;
-  req->stat.st_rdev = 0;
-  req->stat.st_dev = 0;
-  req->stat.st_nlink = 1;
-
-  if (ent.dwFileAttributes & FILE_ATTRIBUTE_READONLY ) {
+  if (info.dwFileAttributes & FILE_ATTRIBUTE_READONLY) {
     req->stat.st_mode |= (_S_IREAD + (_S_IREAD >> 3) + (_S_IREAD >> 6));
   } else {
     req->stat.st_mode |= ((_S_IREAD|_S_IWRITE) + ((_S_IREAD|_S_IWRITE) >> 3) +
       ((_S_IREAD|_S_IWRITE) >> 6));
   }
 
-  if (ent.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+  if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
     req->stat.st_mode |= _S_IFDIR;
   } else {
     req->stat.st_mode |= _S_IFREG;
   }
 
-  uv_filetime_to_time_t(&ent.ftLastWriteTime, &(req->stat.st_mtime));
-  uv_filetime_to_time_t(&ent.ftLastAccessTime, &(req->stat.st_atime));
-  uv_filetime_to_time_t(&ent.ftCreationTime, &(req->stat.st_ctime));
+  uv_filetime_to_time_t(&info.ftLastWriteTime, &(req->stat.st_mtime));
+  uv_filetime_to_time_t(&info.ftLastAccessTime, &(req->stat.st_atime));
+  uv_filetime_to_time_t(&info.ftCreationTime, &(req->stat.st_ctime));
+
+  req->stat.st_size = ((int64_t) info.nFileSizeHigh << 32) +
+                      (int64_t) info.nFileSizeLow;
 
-  req->stat.st_size = ((int64_t)ent.nFileSizeHigh << 32) +
-    (int64_t)ent.nFileSizeLow;
+  req->stat.st_nlink = info.nNumberOfLinks;
 
   req->ptr = &req->stat;
   req->result = 0;
+
+  CloseHandle(handle);
 }
 
 
diff --git a/test/test-fs.c b/test/test-fs.c
index b88636b..52b34ea 100644
--- a/test/test-fs.c
+++ b/test/test-fs.c
@@ -1296,6 +1296,19 @@ TEST_IMPL(fs_stat_root) {
   r = uv_fs_stat(loop, &stat_req, "\\", NULL);
   ASSERT(r == 0);
 
+  r = uv_fs_stat(loop, &stat_req, "..\\..\\..\\..\\..\\..\\..", NULL);
+  ASSERT(r == 0);
+
+  r = uv_fs_stat(loop, &stat_req, "..", NULL);
+  ASSERT(r == 0);
+
+  r = uv_fs_stat(loop, &stat_req, "..\\", NULL);
+  ASSERT(r == 0);
+
+  /* stats the current directory on c: */
+  r = uv_fs_stat(loop, &stat_req, "c:", NULL);
+  ASSERT(r == 0);
+
   r = uv_fs_stat(loop, &stat_req, "c:\\", NULL);
   ASSERT(r == 0);
 
-- 
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