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cpython/Modules/expat/loadlibrary.c at tkinter_docs · native-api/cpython · GitHub
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loadlibrary.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2016 - 2017, Steve Holme, <steve_holme@hotmail.com>.
* Copyright (C) 2017, Expat development team
*
* All rights reserved.
* Licensed under the MIT license:
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* 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 OF
* THIRD PARTY RIGHTS. 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.
*
* Except as contained in this notice, the name of a copyright holder shall
* not be used in advertising or otherwise to promote the sale, use or other
* dealings in this Software without prior written authorization of the
* copyright holder.
*
***************************************************************************/
#if
defined(
_WIN32
)
#include
<windows.h>
#include
<tchar.h>
HMODULE
_Expat_LoadLibrary
(
LPCTSTR
filename
);
#if
!defined(
LOAD_WITH_ALTERED_SEARCH_PATH
)
#define
LOAD_WITH_ALTERED_SEARCH_PATH
0x00000008
#endif
#if
!defined(
LOAD_LIBRARY_SEARCH_SYSTEM32
)
#define
LOAD_LIBRARY_SEARCH_SYSTEM32
0x00000800
#endif
/* We use our own typedef here since some headers might lack these */
typedef
HMODULE
(
APIENTRY
*
LOADLIBRARYEX_FN
)(
LPCTSTR
,
HANDLE
,
DWORD
);
/* See function definitions in winbase.h */
#ifdef
UNICODE
# ifdef
_WIN32_WCE
# define
LOADLIBARYEX
L"LoadLibraryExW"
# else
# define
LOADLIBARYEX
"LoadLibraryExW"
# endif
#else
# define
LOADLIBARYEX
"LoadLibraryExA"
#endif
/*
* _Expat_LoadLibrary()
*
* This is used to dynamically load DLLs using the most secure method available
* for the version of Windows that we are running on.
*
* Parameters:
*
* filename [in] - The filename or full path of the DLL to load. If only the
* filename is passed then the DLL will be loaded from the
* Windows system directory.
*
* Returns the handle of the module on success; otherwise NULL.
*/
HMODULE
_Expat_LoadLibrary
(
LPCTSTR
filename
)
{
HMODULE
hModule
=
NULL
;
LOADLIBRARYEX_FN
pLoadLibraryEx
=
NULL
;
/* Get a handle to kernel32 so we can access it's functions at runtime */
HMODULE
hKernel32
=
GetModuleHandle
(
TEXT
(
"kernel32"
));
if
(!
hKernel32
)
return
NULL
;
/* Attempt to find LoadLibraryEx() which is only available on Windows 2000
and above */
pLoadLibraryEx
=
(
LOADLIBRARYEX_FN
)
GetProcAddress
(
hKernel32
,
LOADLIBARYEX
);
/* Detect if there's already a path in the filename and load the library if
there is. Note: Both back slashes and forward slashes have been supported
since the earlier days of DOS at an API level although they are not
supported by command prompt */
if
(
_tcspbrk
(
filename
,
TEXT
(
"\\/"
))) {
/** !checksrc! disable BANNEDFUNC 1 **/
hModule
=
pLoadLibraryEx
?
pLoadLibraryEx
(
filename
,
NULL
,
LOAD_WITH_ALTERED_SEARCH_PATH
) :
LoadLibrary
(
filename
);
}
/* Detect if KB2533623 is installed, as LOAD_LIBARY_SEARCH_SYSTEM32 is only
supported on Windows Vista, Windows Server 2008, Windows 7 and Windows
Server 2008 R2 with this patch or natively on Windows 8 and above */
else
if
(
pLoadLibraryEx
&&
GetProcAddress
(
hKernel32
,
"AddDllDirectory"
)) {
/* Load the DLL from the Windows system directory */
hModule
=
pLoadLibraryEx
(
filename
,
NULL
,
LOAD_LIBRARY_SEARCH_SYSTEM32
);
}
else
{
/* Attempt to get the Windows system path */
UINT
systemdirlen
=
GetSystemDirectory
(
NULL
,
0
);
if
(
systemdirlen
) {
/* Allocate space for the full DLL path (Room for the null terminator
is included in systemdirlen) */
size_t
filenamelen
=
_tcslen
(
filename
);
TCHAR
*
path
=
malloc
(
sizeof
(
TCHAR
)
*
(
systemdirlen
+
1
+
filenamelen
));
if
(
path
&&
GetSystemDirectory
(
path
,
systemdirlen
)) {
/* Calculate the full DLL path */
_tcscpy
(
path
+
_tcslen
(
path
),
TEXT
(
"\\"
));
_tcscpy
(
path
+
_tcslen
(
path
),
filename
);
/* Load the DLL from the Windows system directory */
/** !checksrc! disable BANNEDFUNC 1 **/
hModule
=
pLoadLibraryEx
?
pLoadLibraryEx
(
path
,
NULL
,
LOAD_WITH_ALTERED_SEARCH_PATH
) :
LoadLibrary
(
path
);
}
free
(
path
);
}
}
return
hModule
;
}
#else
/* defined(_WIN32) */
/* ISO C requires a translation unit to contain at least one declaration
[-Wempty-translation-unit] */
typedef
int
_TRANSLATION_UNIT_LOAD_LIBRARY_C_NOT_EMTPY
;
#endif
/* defined(_WIN32) */
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