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94 lines
2.2 KiB
94 lines
2.2 KiB
7 months ago
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/* Emulation of PyFile_Check() and PyFile_AsFile() for Python 3. */
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static PyObject *PyIOBase_TypeObj;
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static int init_file_emulator(void)
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{
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if (PyIOBase_TypeObj == NULL) {
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PyObject *io = PyImport_ImportModule("_io");
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if (io == NULL)
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return -1;
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PyIOBase_TypeObj = PyObject_GetAttrString(io, "_IOBase");
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if (PyIOBase_TypeObj == NULL)
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return -1;
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}
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return 0;
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}
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#define PyFile_Check(p) PyObject_IsInstance(p, PyIOBase_TypeObj)
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static void _close_file_capsule(PyObject *ob_capsule)
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{
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FILE *f = (FILE *)PyCapsule_GetPointer(ob_capsule, "FILE");
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if (f != NULL)
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fclose(f);
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}
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static FILE *PyFile_AsFile(PyObject *ob_file)
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{
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PyObject *ob, *ob_capsule = NULL, *ob_mode = NULL;
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FILE *f;
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int fd;
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const char *mode;
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ob = PyObject_CallMethod(ob_file, "flush", NULL);
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if (ob == NULL)
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goto fail;
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Py_DECREF(ob);
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ob_capsule = PyObject_GetAttrString(ob_file, "__cffi_FILE");
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if (ob_capsule == NULL) {
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PyErr_Clear();
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fd = PyObject_AsFileDescriptor(ob_file);
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if (fd < 0)
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goto fail;
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ob_mode = PyObject_GetAttrString(ob_file, "mode");
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if (ob_mode == NULL)
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goto fail;
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mode = PyText_AsUTF8(ob_mode);
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if (mode == NULL)
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goto fail;
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fd = dup(fd);
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if (fd < 0) {
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PyErr_SetFromErrno(PyExc_OSError);
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goto fail;
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}
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f = fdopen(fd, mode);
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if (f == NULL) {
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close(fd);
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PyErr_SetFromErrno(PyExc_OSError);
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goto fail;
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}
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setbuf(f, NULL); /* non-buffered */
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Py_DECREF(ob_mode);
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ob_mode = NULL;
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ob_capsule = PyCapsule_New(f, "FILE", _close_file_capsule);
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if (ob_capsule == NULL) {
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fclose(f);
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goto fail;
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}
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if (PyObject_SetAttrString(ob_file, "__cffi_FILE", ob_capsule) < 0)
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goto fail;
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}
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else {
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f = PyCapsule_GetPointer(ob_capsule, "FILE");
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}
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Py_DECREF(ob_capsule); /* assumes still at least one reference */
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return f;
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fail:
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Py_XDECREF(ob_mode);
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Py_XDECREF(ob_capsule);
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return NULL;
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}
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