diff options
Diffstat (limited to 'src/lib/nt/ntopenat.c')
| -rw-r--r-- | src/lib/nt/ntopenat.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/lib/nt/ntopenat.c b/src/lib/nt/ntopenat.c new file mode 100644 index 0000000..6db4de7 --- /dev/null +++ b/src/lib/nt/ntopenat.c @@ -0,0 +1,161 @@ +/* $Id: ntdir.c 3007 2016-11-06 16:46:43Z bird $ */
+/** @file
+ * MSC + NT openat API.
+ */
+
+/*
+ * Copyright (c) 2005-2021 knut st. osmundsen <bird-kBuild-spamx@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Alternatively, the content of this file may be used under the terms of the
+ * GPL version 2 or later, or LGPL version 2.1 or later.
+ */
+
+
+/*******************************************************************************
+* Header Files *
+*******************************************************************************/
+#include <errno.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <io.h>
+
+#include "ntstuff.h"
+#include "nthlp.h"
+#include "ntopenat.h"
+#include "ntstat.h"
+
+
+#define IS_ALPHA(ch) ( ((ch) >= 'A' && (ch) <= 'Z') || ((ch) >= 'a' && (ch) <= 'z') )
+#define IS_SLASH(ch) ((ch) == '\\' || (ch) == '/')
+
+
+
+static int birdOpenInt(const char *pszPath, int fFlags, unsigned __int16 fMode)
+{
+ /*
+ * Try open it using the CRT's open function, but deal with opening
+ * directories as the CRT doesn't allow doing that.
+ */
+ int const iErrnoSaved = errno;
+ int fd = open(pszPath, fFlags, fMode);
+ if ( fd < 0
+ && (errno == EACCES || errno == ENOENT || errno == EISDIR)
+ && (fFlags & (_O_WRONLY | _O_RDWR | _O_RDONLY)) == _O_RDONLY
+ && (fFlags & (_O_CREAT | _O_TRUNC | _O_EXCL)) == 0 )
+ {
+ BirdStat_T Stat;
+ if (!birdStatFollowLink(pszPath, &Stat))
+ {
+ if (S_ISDIR(Stat.st_mode))
+ {
+ HANDLE hDir;
+ errno = iErrnoSaved;
+ hDir = birdOpenFile(pszPath,
+ FILE_READ_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE,
+ FILE_ATTRIBUTE_NORMAL,
+ FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+ FILE_OPEN,
+ FILE_DIRECTORY_FILE | FILE_OPEN_FOR_BACKUP_INTENT | FILE_SYNCHRONOUS_IO_NONALERT,
+ OBJ_CASE_INSENSITIVE);
+ if (hDir != INVALID_HANDLE_VALUE)
+ {
+ fd = _open_osfhandle((intptr_t)hDir, fFlags);
+ if (fd >= 0)
+ return fd;
+ birdCloseFile(hDir);
+ }
+ }
+ else
+ errno = EACCES;
+ }
+ else
+ errno = EACCES;
+ }
+ return fd;
+}
+
+
+int birdOpen(const char *pszPath, int fFlags, ...)
+{
+ unsigned __int16 fMode;
+ va_list va;
+ va_start(va, fFlags);
+ fMode = va_arg(va, unsigned __int16);
+ va_end(va);
+ return birdOpenInt(pszPath, fFlags, fMode);
+}
+
+
+
+/**
+ * Implements opendir.
+ */
+int birdOpenAt(int fdDir, const char *pszPath, int fFlags, ...)
+{
+ HANDLE hDir;
+
+ /*
+ * Retrieve the mode mask.
+ */
+ unsigned __int16 fMode;
+ va_list va;
+ va_start(va, fFlags);
+ fMode = va_arg(va, unsigned __int16);
+ va_end(va);
+
+ /*
+ * Just call 'open' directly if we can get away with it:
+ */
+ if (fdDir == AT_FDCWD)
+ return birdOpenInt(pszPath, fFlags, fMode);
+
+ if (IS_SLASH(pszPath[0]))
+ {
+ if (IS_SLASH(pszPath[1]) && !IS_SLASH(pszPath[2]) && pszPath[2] != '\0')
+ return birdOpenInt(pszPath, fFlags, fMode);
+ }
+ else if (IS_ALPHA(pszPath[0]) && pszPath[1] == ':')
+ {
+ if (IS_SLASH(pszPath[2]))
+ return birdOpenInt(pszPath, fFlags, fMode);
+ /*
+ * Drive letter relative path like "C:kernel32.dll".
+ * We could try use fdDir as the CWD here if it refers to the same drive,
+ * however that's can be implemented later...
+ */
+ return birdOpenInt(pszPath, fFlags, fMode);
+ }
+
+ /*
+ * Otherwise query the path of fdDir and construct an absolute path from all that.
+ * This isn't atomic and safe and stuff, but it gets the work done for now.
+ */
+ hDir = (HANDLE)_get_osfhandle(fdDir);
+ if (hDir != INVALID_HANDLE_VALUE)
+ {
+ /** @todo implement me. */
+ __debugbreak();
+ errno = EBADF;
+ }
+ return -1;
+}
+
+
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