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python: Support Python 3 on Windows
Copy updated implementation of PyFileGET from libxml2.
This commit is contained in:
Nick Wellnhofer
190
python/types.c
190
python/types.c
@ -25,42 +25,182 @@ xmlParserInputPtr xmlNoNetExternalEntityLoader(const char *URL,
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#if PY_MAJOR_VERSION >= 3
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#include <stdio.h>
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#include <stdint.h>
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#ifdef _WIN32
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#include <windows.h>
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#include <crtdbg.h>
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/* Taken from info on MSDN site, as we may not have the Windows WDK/DDK headers */
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typedef struct _IO_STATUS_BLOCK {
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union {
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NTSTATUS Status;
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PVOID Pointer;
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} DUMMYUNIONNAME;
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ULONG_PTR Information;
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} IO_STATUS_BLOCK;
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typedef struct _FILE_ACCESS_INFORMATION {
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ACCESS_MASK AccessFlags;
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} FILE_ACCESS_INFORMATION;
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typedef NTSTATUS (*t_NtQueryInformationFile) (HANDLE FileHandle,
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IO_STATUS_BLOCK *IoStatusBlock,
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PVOID FileInformation,
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ULONG Length,
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int FileInformationClass); /* this is an Enum */
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#if (defined (_MSC_VER) && _MSC_VER >= 1400)
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/*
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* This is the (empty) invalid parameter handler
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* that is used for Visual C++ 2005 (and later) builds
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* so that we can use this instead of the system automatically
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* aborting the process.
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*
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* This is necessary as we use _get_oshandle() to check the validity
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* of the file descriptors as we close them, so when an invalid file
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* descriptor is passed into that function as we check on it, we get
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* -1 as the result, instead of the gspawn helper program aborting.
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*
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* Please see http://msdn.microsoft.com/zh-tw/library/ks2530z6%28v=vs.80%29.aspx
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* for an explanation on this.
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*/
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void
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myInvalidParameterHandler(const wchar_t *expression,
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const wchar_t *function,
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const wchar_t *file,
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unsigned int line,
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uintptr_t pReserved)
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{
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}
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#endif
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#else
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#include <unistd.h>
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#include <fcntl.h>
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#endif
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FILE *
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libxml_PyFileGet(PyObject *f) {
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int fd, flags;
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FILE *res;
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const char *mode;
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int fd = PyObject_AsFileDescriptor(f);
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#ifdef _WIN32
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intptr_t w_fh = -1;
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HMODULE hntdll = NULL;
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IO_STATUS_BLOCK status_block;
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FILE_ACCESS_INFORMATION ai;
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t_NtQueryInformationFile NtQueryInformationFile;
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BOOL is_read = FALSE;
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BOOL is_write = FALSE;
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BOOL is_append = FALSE;
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#if (defined (_MSC_VER) && _MSC_VER >= 1400)
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/* set up our empty invalid parameter handler */
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_invalid_parameter_handler oldHandler, newHandler;
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newHandler = myInvalidParameterHandler;
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oldHandler = _set_invalid_parameter_handler(newHandler);
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/* Disable the message box for assertions. */
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_CrtSetReportMode(_CRT_ASSERT, 0);
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#endif
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w_fh = _get_osfhandle(fd);
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if (w_fh == -1)
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return(NULL);
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hntdll = GetModuleHandleW(L"ntdll.dll");
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if (hntdll == NULL)
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return(NULL);
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XML_IGNORE_FPTR_CAST_WARNINGS
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NtQueryInformationFile = (t_NtQueryInformationFile)GetProcAddress(hntdll, "NtQueryInformationFile");
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XML_POP_WARNINGS
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if (NtQueryInformationFile != NULL &&
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(NtQueryInformationFile((HANDLE)w_fh,
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&status_block,
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&ai,
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sizeof(FILE_ACCESS_INFORMATION),
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8) == 0)) /* 8 means "FileAccessInformation" */
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{
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if (ai.AccessFlags & FILE_READ_DATA)
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is_read = TRUE;
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if (ai.AccessFlags & FILE_WRITE_DATA)
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is_write = TRUE;
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if (ai.AccessFlags & FILE_APPEND_DATA)
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is_append = TRUE;
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if (is_write) {
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if (is_read) {
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if (is_append)
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mode = "a+";
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else
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mode = "rw";
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} else {
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if (is_append)
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mode = "a";
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else
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mode = "w";
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}
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} else {
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if (is_append)
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mode = "r+";
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else
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mode = "r";
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}
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}
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FreeLibrary(hntdll);
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if (!is_write && !is_read) /* also happens if we did not load or run NtQueryInformationFile() successfully */
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return(NULL);
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#else
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int flags;
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fd = PyObject_AsFileDescriptor(f);
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/*
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* Get the flags on the fd to understand how it was opened
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* macOS returns O_RDWR for standard streams, but fails to write to
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* stdout or stderr when opened with fdopen(dup_fd, "rw").
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*/
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flags = fcntl(fd, F_GETFL, 0);
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switch (flags & O_ACCMODE) {
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case O_RDWR:
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if (flags & O_APPEND)
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mode = "a+";
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else
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mode = "rw";
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break;
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case O_RDONLY:
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if (flags & O_APPEND)
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mode = "r+";
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else
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mode = "r";
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break;
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case O_WRONLY:
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if (flags & O_APPEND)
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mode = "a";
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else
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mode = "w";
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break;
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default:
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return(NULL);
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switch (fd) {
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case STDIN_FILENO:
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mode = "r";
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break;
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case STDOUT_FILENO:
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case STDERR_FILENO:
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mode = "w";
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break;
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default:
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/*
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* Get the flags on the fd to understand how it was opened
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*/
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flags = fcntl(fd, F_GETFL, 0);
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switch (flags & O_ACCMODE) {
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case O_RDWR:
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if (flags & O_APPEND)
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mode = "a+";
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else
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mode = "rw";
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break;
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case O_RDONLY:
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if (flags & O_APPEND)
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mode = "r+";
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else
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mode = "r";
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break;
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case O_WRONLY:
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if (flags & O_APPEND)
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mode = "a";
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else
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mode = "w";
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break;
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default:
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return(NULL);
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}
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}
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#endif
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/*
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* the FILE struct gets a new fd, so that it can be closed
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