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514 lines (460 loc) · 14.9 KB
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/* File object implementation (what's left of it -- see io.py) */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#ifdef HAVE_GETC_UNLOCKED
#define GETC(f) getc_unlocked(f)
#define FLOCKFILE(f) flockfile(f)
#define FUNLOCKFILE(f) funlockfile(f)
#else
#define GETC(f) getc(f)
#define FLOCKFILE(f)
#define FUNLOCKFILE(f)
#endif
/* Newline flags */
#define NEWLINE_UNKNOWN 0 /* No newline seen, yet */
#define NEWLINE_CR 1 /* \r newline seen */
#define NEWLINE_LF 2 /* \n newline seen */
#define NEWLINE_CRLF 4 /* \r\n newline seen */
#ifdef __cplusplus
extern "C" {
#endif
/* External C interface */
PyObject *
PyFile_FromFd(int fd, const char *name, const char *mode, int buffering, const char *encoding,
const char *errors, const char *newline, int closefd)
{
PyObject *io, *stream;
_Py_IDENTIFIER(open);
io = PyImport_ImportModule("io");
if (io == NULL)
return NULL;
stream = _PyObject_CallMethodId(io, &PyId_open, "isisssi", fd, mode,
buffering, encoding, errors,
newline, closefd);
Py_DECREF(io);
if (stream == NULL)
return NULL;
/* ignore name attribute because the name attribute of _BufferedIOMixin
and TextIOWrapper is read only */
return stream;
}
PyObject *
PyFile_GetLine(PyObject *f, int n)
{
_Py_IDENTIFIER(readline);
PyObject *result;
if (f == NULL) {
PyErr_BadInternalCall();
return NULL;
}
if (n <= 0) {
result = _PyObject_CallMethodIdObjArgs(f, &PyId_readline, NULL);
}
else {
result = _PyObject_CallMethodId(f, &PyId_readline, "i", n);
}
if (result != NULL && !PyBytes_Check(result) &&
!PyUnicode_Check(result)) {
Py_DECREF(result);
result = NULL;
PyErr_SetString(PyExc_TypeError,
"object.readline() returned non-string");
}
if (n < 0 && result != NULL && PyBytes_Check(result)) {
char *s = PyBytes_AS_STRING(result);
Py_ssize_t len = PyBytes_GET_SIZE(result);
if (len == 0) {
Py_DECREF(result);
result = NULL;
PyErr_SetString(PyExc_EOFError,
"EOF when reading a line");
}
else if (s[len-1] == '\n') {
if (result->ob_refcnt == 1)
_PyBytes_Resize(&result, len-1);
else {
PyObject *v;
v = PyBytes_FromStringAndSize(s, len-1);
Py_DECREF(result);
result = v;
}
}
}
if (n < 0 && result != NULL && PyUnicode_Check(result)) {
Py_ssize_t len = PyUnicode_GET_LENGTH(result);
if (len == 0) {
Py_DECREF(result);
result = NULL;
PyErr_SetString(PyExc_EOFError,
"EOF when reading a line");
}
else if (PyUnicode_READ_CHAR(result, len-1) == '\n') {
PyObject *v;
v = PyUnicode_Substring(result, 0, len-1);
Py_DECREF(result);
result = v;
}
}
return result;
}
/* Interfaces to write objects/strings to file-like objects */
int
PyFile_WriteObject(PyObject *v, PyObject *f, int flags)
{
PyObject *writer, *value, *result;
_Py_IDENTIFIER(write);
if (f == NULL) {
PyErr_SetString(PyExc_TypeError, "writeobject with NULL file");
return -1;
}
writer = _PyObject_GetAttrId(f, &PyId_write);
if (writer == NULL)
return -1;
if (flags & Py_PRINT_RAW) {
value = PyObject_Str(v);
}
else
value = PyObject_Repr(v);
if (value == NULL) {
Py_DECREF(writer);
return -1;
}
result = PyObject_CallFunctionObjArgs(writer, value, NULL);
Py_DECREF(value);
Py_DECREF(writer);
if (result == NULL)
return -1;
Py_DECREF(result);
return 0;
}
int
PyFile_WriteString(const char *s, PyObject *f)
{
if (f == NULL) {
/* Should be caused by a pre-existing error */
if (!PyErr_Occurred())
PyErr_SetString(PyExc_SystemError,
"null file for PyFile_WriteString");
return -1;
}
else if (!PyErr_Occurred()) {
PyObject *v = PyUnicode_FromString(s);
int err;
if (v == NULL)
return -1;
err = PyFile_WriteObject(v, f, Py_PRINT_RAW);
Py_DECREF(v);
return err;
}
else
return -1;
}
/* Try to get a file-descriptor from a Python object. If the object
is an integer, its value is returned. If not, the
object's fileno() method is called if it exists; the method must return
an integer, which is returned as the file descriptor value.
-1 is returned on failure.
*/
int
PyObject_AsFileDescriptor(PyObject *o)
{
int fd;
PyObject *meth;
_Py_IDENTIFIER(fileno);
if (PyLong_Check(o)) {
fd = _PyLong_AsInt(o);
}
else if ((meth = _PyObject_GetAttrId(o, &PyId_fileno)) != NULL)
{
PyObject *fno = _PyObject_CallNoArg(meth);
Py_DECREF(meth);
if (fno == NULL)
return -1;
if (PyLong_Check(fno)) {
fd = _PyLong_AsInt(fno);
Py_DECREF(fno);
}
else {
PyErr_SetString(PyExc_TypeError,
"fileno() returned a non-integer");
Py_DECREF(fno);
return -1;
}
}
else {
PyErr_SetString(PyExc_TypeError,
"argument must be an int, or have a fileno() method.");
return -1;
}
if (fd == -1 && PyErr_Occurred())
return -1;
if (fd < 0) {
PyErr_Format(PyExc_ValueError,
"file descriptor cannot be a negative integer (%i)",
fd);
return -1;
}
return fd;
}
/*
** Py_UniversalNewlineFgets is an fgets variation that understands
** all of \r, \n and \r\n conventions.
** The stream should be opened in binary mode.
** If fobj is NULL the routine always does newline conversion, and
** it may peek one char ahead to gobble the second char in \r\n.
** If fobj is non-NULL it must be a PyFileObject. In this case there
** is no readahead but in stead a flag is used to skip a following
** \n on the next read. Also, if the file is open in binary mode
** the whole conversion is skipped. Finally, the routine keeps track of
** the different types of newlines seen.
** Note that we need no error handling: fgets() treats error and eof
** identically.
*/
char *
Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
{
char *p = buf;
int c;
int newlinetypes = 0;
int skipnextlf = 0;
if (fobj) {
errno = ENXIO; /* What can you do... */
return NULL;
}
FLOCKFILE(stream);
c = 'x'; /* Shut up gcc warning */
while (--n > 0 && (c = GETC(stream)) != EOF ) {
if (skipnextlf ) {
skipnextlf = 0;
if (c == '\n') {
/* Seeing a \n here with skipnextlf true
** means we saw a \r before.
*/
newlinetypes |= NEWLINE_CRLF;
c = GETC(stream);
if (c == EOF) break;
} else {
/*
** Note that c == EOF also brings us here,
** so we're okay if the last char in the file
** is a CR.
*/
newlinetypes |= NEWLINE_CR;
}
}
if (c == '\r') {
/* A \r is translated into a \n, and we skip
** an adjacent \n, if any. We don't set the
** newlinetypes flag until we've seen the next char.
*/
skipnextlf = 1;
c = '\n';
} else if ( c == '\n') {
newlinetypes |= NEWLINE_LF;
}
*p++ = c;
if (c == '\n') break;
}
/* if ( c == EOF && skipnextlf )
newlinetypes |= NEWLINE_CR; */
FUNLOCKFILE(stream);
*p = '\0';
if ( skipnextlf ) {
/* If we have no file object we cannot save the
** skipnextlf flag. We have to readahead, which
** will cause a pause if we're reading from an
** interactive stream, but that is very unlikely
** unless we're doing something silly like
** exec(open("/dev/tty").read()).
*/
c = GETC(stream);
if ( c != '\n' )
ungetc(c, stream);
}
if (p == buf)
return NULL;
return buf;
}
/* **************************** std printer ****************************
* The stdprinter is used during the boot strapping phase as a preliminary
* file like object for sys.stderr.
*/
typedef struct {
PyObject_HEAD
int fd;
} PyStdPrinter_Object;
static PyObject *
stdprinter_new(PyTypeObject *type, PyObject *args, PyObject *kews)
{
PyStdPrinter_Object *self;
assert(type != NULL && type->tp_alloc != NULL);
self = (PyStdPrinter_Object *) type->tp_alloc(type, 0);
if (self != NULL) {
self->fd = -1;
}
return (PyObject *) self;
}
static int
stdprinter_init(PyObject *self, PyObject *args, PyObject *kwds)
{
PyErr_SetString(PyExc_TypeError,
"cannot create 'stderrprinter' instances");
return -1;
}
PyObject *
PyFile_NewStdPrinter(int fd)
{
PyStdPrinter_Object *self;
if (fd != fileno(stdout) && fd != fileno(stderr)) {
/* not enough infrastructure for PyErr_BadInternalCall() */
return NULL;
}
self = PyObject_New(PyStdPrinter_Object,
&PyStdPrinter_Type);
if (self != NULL) {
self->fd = fd;
}
return (PyObject*)self;
}
static PyObject *
stdprinter_write(PyStdPrinter_Object *self, PyObject *args)
{
PyObject *unicode;
PyObject *bytes = NULL;
const char *str;
Py_ssize_t n;
int err;
if (self->fd < 0) {
/* fd might be invalid on Windows
* I can't raise an exception here. It may lead to an
* unlimited recursion in the case stderr is invalid.
*/
Py_RETURN_NONE;
}
if (!PyArg_ParseTuple(args, "U", &unicode))
return NULL;
/* encode Unicode to UTF-8 */
str = PyUnicode_AsUTF8AndSize(unicode, &n);
if (str == NULL) {
PyErr_Clear();
bytes = _PyUnicode_AsUTF8String(unicode, "backslashreplace");
if (bytes == NULL)
return NULL;
str = PyBytes_AS_STRING(bytes);
n = PyBytes_GET_SIZE(bytes);
}
n = _Py_write(self->fd, str, n);
/* save errno, it can be modified indirectly by Py_XDECREF() */
err = errno;
Py_XDECREF(bytes);
if (n == -1) {
if (err == EAGAIN) {
PyErr_Clear();
Py_RETURN_NONE;
}
return NULL;
}
return PyLong_FromSsize_t(n);
}
static PyObject *
stdprinter_fileno(PyStdPrinter_Object *self, PyObject *Py_UNUSED(ignored))
{
return PyLong_FromLong((long) self->fd);
}
static PyObject *
stdprinter_repr(PyStdPrinter_Object *self)
{
return PyUnicode_FromFormat("<stdprinter(fd=%d) object at 0x%x>",
self->fd, self);
}
static PyObject *
stdprinter_noop(PyStdPrinter_Object *self, PyObject *Py_UNUSED(ignored))
{
Py_RETURN_NONE;
}
static PyObject *
stdprinter_isatty(PyStdPrinter_Object *self, PyObject *Py_UNUSED(ignored))
{
long res;
if (self->fd < 0) {
Py_RETURN_FALSE;
}
Py_BEGIN_ALLOW_THREADS
res = isatty(self->fd);
Py_END_ALLOW_THREADS
return PyBool_FromLong(res);
}
static PyMethodDef stdprinter_methods[] = {
{"close", (PyCFunction)stdprinter_noop, METH_NOARGS, ""},
{"flush", (PyCFunction)stdprinter_noop, METH_NOARGS, ""},
{"fileno", (PyCFunction)stdprinter_fileno, METH_NOARGS, ""},
{"isatty", (PyCFunction)stdprinter_isatty, METH_NOARGS, ""},
{"write", (PyCFunction)stdprinter_write, METH_VARARGS, ""},
{NULL, NULL} /*sentinel */
};
static PyObject *
get_closed(PyStdPrinter_Object *self, void *closure)
{
Py_RETURN_FALSE;
}
static PyObject *
get_mode(PyStdPrinter_Object *self, void *closure)
{
return PyUnicode_FromString("w");
}
static PyObject *
get_encoding(PyStdPrinter_Object *self, void *closure)
{
Py_RETURN_NONE;
}
static PyGetSetDef stdprinter_getsetlist[] = {
{"closed", (getter)get_closed, NULL, "True if the file is closed"},
{"encoding", (getter)get_encoding, NULL, "Encoding of the file"},
{"mode", (getter)get_mode, NULL, "String giving the file mode"},
{0},
};
PyTypeObject PyStdPrinter_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"stderrprinter", /* tp_name */
sizeof(PyStdPrinter_Object), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
0, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
(reprfunc)stdprinter_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
stdprinter_methods, /* tp_methods */
0, /* tp_members */
stdprinter_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
stdprinter_init, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
stdprinter_new, /* tp_new */
PyObject_Del, /* tp_free */
};
#ifdef __cplusplus
}
#endif
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