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Copy pathtextio.c
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3399 lines (2968 loc) · 98.7 KB
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/*
An implementation of Text I/O as defined by PEP 3116 - "New I/O"
Classes defined here: TextIOBase, IncrementalNewlineDecoder, TextIOWrapper.
Written by Amaury Forgeot d'Arc and Antoine Pitrou
*/
#include "Python.h"
#include "pycore_call.h" // _PyObject_CallMethod()
#include "pycore_codecs.h" // _PyCodecInfo_GetIncrementalDecoder()
#include "pycore_fileutils.h" // _Py_GetLocaleEncoding()
#include "pycore_interp.h" // PyInterpreterState.fs_codec
#include "pycore_long.h" // _PyLong_GetZero()
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "pycore_pyerrors.h" // _PyErr_ChainExceptions1()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "_iomodule.h"
/*[clinic input]
module _io
class _io.IncrementalNewlineDecoder "nldecoder_object *" "clinic_state()->PyIncrementalNewlineDecoder_Type"
class _io.TextIOWrapper "textio *" "clinic_state()->TextIOWrapper_Type"
class _io._TextIOBase "PyObject *" "&PyTextIOBase_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=8b7f24fa13bfdd7f]*/
typedef struct nldecoder_object nldecoder_object;
typedef struct textio textio;
#define clinic_state() (find_io_state_by_def(Py_TYPE(self)))
#include "clinic/textio.c.h"
#undef clinic_state
/* TextIOBase */
PyDoc_STRVAR(textiobase_doc,
"Base class for text I/O.\n"
"\n"
"This class provides a character and line based interface to stream\n"
"I/O. There is no readinto method because Python's character strings\n"
"are immutable.\n"
);
static PyObject *
_unsupported(_PyIO_State *state, const char *message)
{
PyErr_SetString(state->unsupported_operation, message);
return NULL;
}
/*[clinic input]
_io._TextIOBase.detach
cls: defining_class
/
Separate the underlying buffer from the TextIOBase and return it.
After the underlying buffer has been detached, the TextIO is in an unusable state.
[clinic start generated code]*/
static PyObject *
_io__TextIOBase_detach_impl(PyObject *self, PyTypeObject *cls)
/*[clinic end generated code: output=50915f40c609eaa4 input=987ca3640d0a3776]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return _unsupported(state, "detach");
}
/*[clinic input]
_io._TextIOBase.read
cls: defining_class
size: int(unused=True) = -1
/
Read at most size characters from stream.
Read from underlying buffer until we have size characters or we hit EOF.
If size is negative or omitted, read until EOF.
[clinic start generated code]*/
static PyObject *
_io__TextIOBase_read_impl(PyObject *self, PyTypeObject *cls,
int Py_UNUSED(size))
/*[clinic end generated code: output=51a5178a309ce647 input=f5e37720f9fc563f]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return _unsupported(state, "read");
}
/*[clinic input]
_io._TextIOBase.readline
cls: defining_class
size: int(unused=True) = -1
/
Read until newline or EOF.
Return an empty string if EOF is hit immediately.
If size is specified, at most size characters will be read.
[clinic start generated code]*/
static PyObject *
_io__TextIOBase_readline_impl(PyObject *self, PyTypeObject *cls,
int Py_UNUSED(size))
/*[clinic end generated code: output=3f47d7966d6d074e input=42eafec94107fa27]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return _unsupported(state, "readline");
}
/*[clinic input]
_io._TextIOBase.write
cls: defining_class
s: str(unused=True)
/
Write string s to stream.
Return the number of characters written
(which is always equal to the length of the string).
[clinic start generated code]*/
static PyObject *
_io__TextIOBase_write_impl(PyObject *self, PyTypeObject *cls,
const char *Py_UNUSED(s))
/*[clinic end generated code: output=18b28231460275de input=e9cabaa5f6732b07]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return _unsupported(state, "write");
}
/*[clinic input]
@getter
_io._TextIOBase.encoding
Encoding of the text stream.
Subclasses should override.
[clinic start generated code]*/
static PyObject *
_io__TextIOBase_encoding_get_impl(PyObject *self)
/*[clinic end generated code: output=e0f5d8f548b92432 input=4736d7621dd38f43]*/
{
Py_RETURN_NONE;
}
/*[clinic input]
@getter
_io._TextIOBase.newlines
Line endings translated so far.
Only line endings translated during reading are considered.
Subclasses should override.
[clinic start generated code]*/
static PyObject *
_io__TextIOBase_newlines_get_impl(PyObject *self)
/*[clinic end generated code: output=46ec147fb9f00c2a input=a5b196d076af1164]*/
{
Py_RETURN_NONE;
}
/*[clinic input]
@getter
_io._TextIOBase.errors
The error setting of the decoder or encoder.
Subclasses should override.
[clinic start generated code]*/
static PyObject *
_io__TextIOBase_errors_get_impl(PyObject *self)
/*[clinic end generated code: output=c6623d6addcd087d input=974aa52d1db93a82]*/
{
Py_RETURN_NONE;
}
static PyMethodDef textiobase_methods[] = {
_IO__TEXTIOBASE_DETACH_METHODDEF
_IO__TEXTIOBASE_READ_METHODDEF
_IO__TEXTIOBASE_READLINE_METHODDEF
_IO__TEXTIOBASE_WRITE_METHODDEF
{NULL, NULL}
};
static PyGetSetDef textiobase_getset[] = {
_IO__TEXTIOBASE_ENCODING_GETSETDEF
_IO__TEXTIOBASE_NEWLINES_GETSETDEF
_IO__TEXTIOBASE_ERRORS_GETSETDEF
{NULL}
};
static PyType_Slot textiobase_slots[] = {
{Py_tp_doc, (void *)textiobase_doc},
{Py_tp_methods, textiobase_methods},
{Py_tp_getset, textiobase_getset},
{0, NULL},
};
/* Do not set Py_TPFLAGS_HAVE_GC so that tp_traverse and tp_clear are inherited */
PyType_Spec textiobase_spec = {
.name = "_io._TextIOBase",
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
Py_TPFLAGS_IMMUTABLETYPE),
.slots = textiobase_slots,
};
/* IncrementalNewlineDecoder */
struct nldecoder_object {
PyObject_HEAD
PyObject *decoder;
PyObject *errors;
unsigned int pendingcr: 1;
unsigned int translate: 1;
unsigned int seennl: 3;
};
/*[clinic input]
_io.IncrementalNewlineDecoder.__init__
decoder: object
translate: bool
errors: object(c_default="NULL") = "strict"
Codec used when reading a file in universal newlines mode.
It wraps another incremental decoder, translating \r\n and \r into \n.
It also records the types of newlines encountered. When used with
translate=False, it ensures that the newline sequence is returned in
one piece. When used with decoder=None, it expects unicode strings as
decode input and translates newlines without first invoking an external
decoder.
[clinic start generated code]*/
static int
_io_IncrementalNewlineDecoder___init___impl(nldecoder_object *self,
PyObject *decoder, int translate,
PyObject *errors)
/*[clinic end generated code: output=fbd04d443e764ec2 input=ed547aa257616b0e]*/
{
if (errors == NULL) {
errors = &_Py_ID(strict);
}
else {
errors = Py_NewRef(errors);
}
Py_XSETREF(self->errors, errors);
Py_XSETREF(self->decoder, Py_NewRef(decoder));
self->translate = translate ? 1 : 0;
self->seennl = 0;
self->pendingcr = 0;
return 0;
}
static int
incrementalnewlinedecoder_traverse(nldecoder_object *self, visitproc visit,
void *arg)
{
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->decoder);
Py_VISIT(self->errors);
return 0;
}
static int
incrementalnewlinedecoder_clear(nldecoder_object *self)
{
Py_CLEAR(self->decoder);
Py_CLEAR(self->errors);
return 0;
}
static void
incrementalnewlinedecoder_dealloc(nldecoder_object *self)
{
PyTypeObject *tp = Py_TYPE(self);
_PyObject_GC_UNTRACK(self);
(void)incrementalnewlinedecoder_clear(self);
tp->tp_free((PyObject *)self);
Py_DECREF(tp);
}
static int
check_decoded(PyObject *decoded)
{
if (decoded == NULL)
return -1;
if (!PyUnicode_Check(decoded)) {
PyErr_Format(PyExc_TypeError,
"decoder should return a string result, not '%.200s'",
Py_TYPE(decoded)->tp_name);
Py_DECREF(decoded);
return -1;
}
return 0;
}
#define CHECK_INITIALIZED_DECODER(self) \
if (self->errors == NULL) { \
PyErr_SetString(PyExc_ValueError, \
"IncrementalNewlineDecoder.__init__() not called"); \
return NULL; \
}
#define SEEN_CR 1
#define SEEN_LF 2
#define SEEN_CRLF 4
#define SEEN_ALL (SEEN_CR | SEEN_LF | SEEN_CRLF)
PyObject *
_PyIncrementalNewlineDecoder_decode(PyObject *myself,
PyObject *input, int final)
{
PyObject *output;
Py_ssize_t output_len;
nldecoder_object *self = (nldecoder_object *) myself;
CHECK_INITIALIZED_DECODER(self);
/* decode input (with the eventual \r from a previous pass) */
if (self->decoder != Py_None) {
output = PyObject_CallMethodObjArgs(self->decoder,
&_Py_ID(decode), input, final ? Py_True : Py_False, NULL);
}
else {
output = Py_NewRef(input);
}
if (check_decoded(output) < 0)
return NULL;
output_len = PyUnicode_GET_LENGTH(output);
if (self->pendingcr && (final || output_len > 0)) {
/* Prefix output with CR */
int kind;
PyObject *modified;
char *out;
modified = PyUnicode_New(output_len + 1,
PyUnicode_MAX_CHAR_VALUE(output));
if (modified == NULL)
goto error;
kind = PyUnicode_KIND(modified);
out = PyUnicode_DATA(modified);
PyUnicode_WRITE(kind, out, 0, '\r');
memcpy(out + kind, PyUnicode_DATA(output), kind * output_len);
Py_SETREF(output, modified); /* output remains ready */
self->pendingcr = 0;
output_len++;
}
/* retain last \r even when not translating data:
* then readline() is sure to get \r\n in one pass
*/
if (!final) {
if (output_len > 0
&& PyUnicode_READ_CHAR(output, output_len - 1) == '\r')
{
PyObject *modified = PyUnicode_Substring(output, 0, output_len -1);
if (modified == NULL)
goto error;
Py_SETREF(output, modified);
self->pendingcr = 1;
}
}
/* Record which newlines are read and do newline translation if desired,
all in one pass. */
{
const void *in_str;
Py_ssize_t len;
int seennl = self->seennl;
int only_lf = 0;
int kind;
in_str = PyUnicode_DATA(output);
len = PyUnicode_GET_LENGTH(output);
kind = PyUnicode_KIND(output);
if (len == 0)
return output;
/* If, up to now, newlines are consistently \n, do a quick check
for the \r *byte* with the libc's optimized memchr.
*/
if (seennl == SEEN_LF || seennl == 0) {
only_lf = (memchr(in_str, '\r', kind * len) == NULL);
}
if (only_lf) {
/* If not already seen, quick scan for a possible "\n" character.
(there's nothing else to be done, even when in translation mode)
*/
if (seennl == 0 &&
memchr(in_str, '\n', kind * len) != NULL) {
if (kind == PyUnicode_1BYTE_KIND)
seennl |= SEEN_LF;
else {
Py_ssize_t i = 0;
for (;;) {
Py_UCS4 c;
/* Fast loop for non-control characters */
while (PyUnicode_READ(kind, in_str, i) > '\n')
i++;
c = PyUnicode_READ(kind, in_str, i++);
if (c == '\n') {
seennl |= SEEN_LF;
break;
}
if (i >= len)
break;
}
}
}
/* Finished: we have scanned for newlines, and none of them
need translating */
}
else if (!self->translate) {
Py_ssize_t i = 0;
/* We have already seen all newline types, no need to scan again */
if (seennl == SEEN_ALL)
goto endscan;
for (;;) {
Py_UCS4 c;
/* Fast loop for non-control characters */
while (PyUnicode_READ(kind, in_str, i) > '\r')
i++;
c = PyUnicode_READ(kind, in_str, i++);
if (c == '\n')
seennl |= SEEN_LF;
else if (c == '\r') {
if (PyUnicode_READ(kind, in_str, i) == '\n') {
seennl |= SEEN_CRLF;
i++;
}
else
seennl |= SEEN_CR;
}
if (i >= len)
break;
if (seennl == SEEN_ALL)
break;
}
endscan:
;
}
else {
void *translated;
int kind = PyUnicode_KIND(output);
const void *in_str = PyUnicode_DATA(output);
Py_ssize_t in, out;
/* XXX: Previous in-place translation here is disabled as
resizing is not possible anymore */
/* We could try to optimize this so that we only do a copy
when there is something to translate. On the other hand,
we already know there is a \r byte, so chances are high
that something needs to be done. */
translated = PyMem_Malloc(kind * len);
if (translated == NULL) {
PyErr_NoMemory();
goto error;
}
in = out = 0;
for (;;) {
Py_UCS4 c;
/* Fast loop for non-control characters */
while ((c = PyUnicode_READ(kind, in_str, in++)) > '\r')
PyUnicode_WRITE(kind, translated, out++, c);
if (c == '\n') {
PyUnicode_WRITE(kind, translated, out++, c);
seennl |= SEEN_LF;
continue;
}
if (c == '\r') {
if (PyUnicode_READ(kind, in_str, in) == '\n') {
in++;
seennl |= SEEN_CRLF;
}
else
seennl |= SEEN_CR;
PyUnicode_WRITE(kind, translated, out++, '\n');
continue;
}
if (in > len)
break;
PyUnicode_WRITE(kind, translated, out++, c);
}
Py_DECREF(output);
output = PyUnicode_FromKindAndData(kind, translated, out);
PyMem_Free(translated);
if (!output)
return NULL;
}
self->seennl |= seennl;
}
return output;
error:
Py_DECREF(output);
return NULL;
}
/*[clinic input]
_io.IncrementalNewlineDecoder.decode
input: object
final: bool = False
[clinic start generated code]*/
static PyObject *
_io_IncrementalNewlineDecoder_decode_impl(nldecoder_object *self,
PyObject *input, int final)
/*[clinic end generated code: output=0d486755bb37a66e input=90e223c70322c5cd]*/
{
return _PyIncrementalNewlineDecoder_decode((PyObject *) self, input, final);
}
/*[clinic input]
_io.IncrementalNewlineDecoder.getstate
[clinic start generated code]*/
static PyObject *
_io_IncrementalNewlineDecoder_getstate_impl(nldecoder_object *self)
/*[clinic end generated code: output=f0d2c9c136f4e0d0 input=f8ff101825e32e7f]*/
{
PyObject *buffer;
unsigned long long flag;
CHECK_INITIALIZED_DECODER(self);
if (self->decoder != Py_None) {
PyObject *state = PyObject_CallMethodNoArgs(self->decoder,
&_Py_ID(getstate));
if (state == NULL)
return NULL;
if (!PyTuple_Check(state)) {
PyErr_SetString(PyExc_TypeError,
"illegal decoder state");
Py_DECREF(state);
return NULL;
}
if (!PyArg_ParseTuple(state, "OK;illegal decoder state",
&buffer, &flag))
{
Py_DECREF(state);
return NULL;
}
Py_INCREF(buffer);
Py_DECREF(state);
}
else {
buffer = PyBytes_FromString("");
flag = 0;
}
flag <<= 1;
if (self->pendingcr)
flag |= 1;
return Py_BuildValue("NK", buffer, flag);
}
/*[clinic input]
_io.IncrementalNewlineDecoder.setstate
state: object
/
[clinic start generated code]*/
static PyObject *
_io_IncrementalNewlineDecoder_setstate(nldecoder_object *self,
PyObject *state)
/*[clinic end generated code: output=c10c622508b576cb input=c53fb505a76dbbe2]*/
{
PyObject *buffer;
unsigned long long flag;
CHECK_INITIALIZED_DECODER(self);
if (!PyTuple_Check(state)) {
PyErr_SetString(PyExc_TypeError, "state argument must be a tuple");
return NULL;
}
if (!PyArg_ParseTuple(state, "OK;setstate(): illegal state argument",
&buffer, &flag))
{
return NULL;
}
self->pendingcr = (int) (flag & 1);
flag >>= 1;
if (self->decoder != Py_None) {
return _PyObject_CallMethod(self->decoder, &_Py_ID(setstate),
"((OK))", buffer, flag);
}
else {
Py_RETURN_NONE;
}
}
/*[clinic input]
_io.IncrementalNewlineDecoder.reset
[clinic start generated code]*/
static PyObject *
_io_IncrementalNewlineDecoder_reset_impl(nldecoder_object *self)
/*[clinic end generated code: output=32fa40c7462aa8ff input=728678ddaea776df]*/
{
CHECK_INITIALIZED_DECODER(self);
self->seennl = 0;
self->pendingcr = 0;
if (self->decoder != Py_None)
return PyObject_CallMethodNoArgs(self->decoder, &_Py_ID(reset));
else
Py_RETURN_NONE;
}
static PyObject *
incrementalnewlinedecoder_newlines_get(nldecoder_object *self, void *context)
{
CHECK_INITIALIZED_DECODER(self);
switch (self->seennl) {
case SEEN_CR:
return PyUnicode_FromString("\r");
case SEEN_LF:
return PyUnicode_FromString("\n");
case SEEN_CRLF:
return PyUnicode_FromString("\r\n");
case SEEN_CR | SEEN_LF:
return Py_BuildValue("ss", "\r", "\n");
case SEEN_CR | SEEN_CRLF:
return Py_BuildValue("ss", "\r", "\r\n");
case SEEN_LF | SEEN_CRLF:
return Py_BuildValue("ss", "\n", "\r\n");
case SEEN_CR | SEEN_LF | SEEN_CRLF:
return Py_BuildValue("sss", "\r", "\n", "\r\n");
default:
Py_RETURN_NONE;
}
}
/* TextIOWrapper */
typedef PyObject *
(*encodefunc_t)(PyObject *, PyObject *);
struct textio
{
PyObject_HEAD
int ok; /* initialized? */
int detached;
Py_ssize_t chunk_size;
PyObject *buffer;
PyObject *encoding;
PyObject *encoder;
PyObject *decoder;
PyObject *readnl;
PyObject *errors;
const char *writenl; /* ASCII-encoded; NULL stands for \n */
char line_buffering;
char write_through;
char readuniversal;
char readtranslate;
char writetranslate;
char seekable;
char has_read1;
char telling;
char finalizing;
/* Specialized encoding func (see below) */
encodefunc_t encodefunc;
/* Whether or not it's the start of the stream */
char encoding_start_of_stream;
/* Reads and writes are internally buffered in order to speed things up.
However, any read will first flush the write buffer if itsn't empty.
Please also note that text to be written is first encoded before being
buffered. This is necessary so that encoding errors are immediately
reported to the caller, but it unfortunately means that the
IncrementalEncoder (whose encode() method is always written in Python)
becomes a bottleneck for small writes.
*/
PyObject *decoded_chars; /* buffer for text returned from decoder */
Py_ssize_t decoded_chars_used; /* offset into _decoded_chars for read() */
PyObject *pending_bytes; // data waiting to be written.
// ascii unicode, bytes, or list of them.
Py_ssize_t pending_bytes_count;
/* snapshot is either NULL, or a tuple (dec_flags, next_input) where
* dec_flags is the second (integer) item of the decoder state and
* next_input is the chunk of input bytes that comes next after the
* snapshot point. We use this to reconstruct decoder states in tell().
*/
PyObject *snapshot;
/* Bytes-to-characters ratio for the current chunk. Serves as input for
the heuristic in tell(). */
double b2cratio;
/* Cache raw object if it's a FileIO object */
PyObject *raw;
PyObject *weakreflist;
PyObject *dict;
_PyIO_State *state;
};
static void
textiowrapper_set_decoded_chars(textio *self, PyObject *chars);
/* A couple of specialized cases in order to bypass the slow incremental
encoding methods for the most popular encodings. */
static PyObject *
ascii_encode(textio *self, PyObject *text)
{
return _PyUnicode_AsASCIIString(text, PyUnicode_AsUTF8(self->errors));
}
static PyObject *
utf16be_encode(textio *self, PyObject *text)
{
return _PyUnicode_EncodeUTF16(text,
PyUnicode_AsUTF8(self->errors), 1);
}
static PyObject *
utf16le_encode(textio *self, PyObject *text)
{
return _PyUnicode_EncodeUTF16(text,
PyUnicode_AsUTF8(self->errors), -1);
}
static PyObject *
utf16_encode(textio *self, PyObject *text)
{
if (!self->encoding_start_of_stream) {
/* Skip the BOM and use native byte ordering */
#if PY_BIG_ENDIAN
return utf16be_encode(self, text);
#else
return utf16le_encode(self, text);
#endif
}
return _PyUnicode_EncodeUTF16(text,
PyUnicode_AsUTF8(self->errors), 0);
}
static PyObject *
utf32be_encode(textio *self, PyObject *text)
{
return _PyUnicode_EncodeUTF32(text,
PyUnicode_AsUTF8(self->errors), 1);
}
static PyObject *
utf32le_encode(textio *self, PyObject *text)
{
return _PyUnicode_EncodeUTF32(text,
PyUnicode_AsUTF8(self->errors), -1);
}
static PyObject *
utf32_encode(textio *self, PyObject *text)
{
if (!self->encoding_start_of_stream) {
/* Skip the BOM and use native byte ordering */
#if PY_BIG_ENDIAN
return utf32be_encode(self, text);
#else
return utf32le_encode(self, text);
#endif
}
return _PyUnicode_EncodeUTF32(text,
PyUnicode_AsUTF8(self->errors), 0);
}
static PyObject *
utf8_encode(textio *self, PyObject *text)
{
return _PyUnicode_AsUTF8String(text, PyUnicode_AsUTF8(self->errors));
}
static PyObject *
latin1_encode(textio *self, PyObject *text)
{
return _PyUnicode_AsLatin1String(text, PyUnicode_AsUTF8(self->errors));
}
// Return true when encoding can be skipped when text is ascii.
static inline int
is_asciicompat_encoding(encodefunc_t f)
{
return f == (encodefunc_t) ascii_encode
|| f == (encodefunc_t) latin1_encode
|| f == (encodefunc_t) utf8_encode;
}
/* Map normalized encoding names onto the specialized encoding funcs */
typedef struct {
const char *name;
encodefunc_t encodefunc;
} encodefuncentry;
static const encodefuncentry encodefuncs[] = {
{"ascii", (encodefunc_t) ascii_encode},
{"iso8859-1", (encodefunc_t) latin1_encode},
{"utf-8", (encodefunc_t) utf8_encode},
{"utf-16-be", (encodefunc_t) utf16be_encode},
{"utf-16-le", (encodefunc_t) utf16le_encode},
{"utf-16", (encodefunc_t) utf16_encode},
{"utf-32-be", (encodefunc_t) utf32be_encode},
{"utf-32-le", (encodefunc_t) utf32le_encode},
{"utf-32", (encodefunc_t) utf32_encode},
{NULL, NULL}
};
static int
validate_newline(const char *newline)
{
if (newline && newline[0] != '\0'
&& !(newline[0] == '\n' && newline[1] == '\0')
&& !(newline[0] == '\r' && newline[1] == '\0')
&& !(newline[0] == '\r' && newline[1] == '\n' && newline[2] == '\0')) {
PyErr_Format(PyExc_ValueError,
"illegal newline value: %s", newline);
return -1;
}
return 0;
}
static int
set_newline(textio *self, const char *newline)
{
PyObject *old = self->readnl;
if (newline == NULL) {
self->readnl = NULL;
}
else {
self->readnl = PyUnicode_FromString(newline);
if (self->readnl == NULL) {
self->readnl = old;
return -1;
}
}
self->readuniversal = (newline == NULL || newline[0] == '\0');
self->readtranslate = (newline == NULL);
self->writetranslate = (newline == NULL || newline[0] != '\0');
if (!self->readuniversal && self->readnl != NULL) {
// validate_newline() accepts only ASCII newlines.
assert(PyUnicode_KIND(self->readnl) == PyUnicode_1BYTE_KIND);
self->writenl = (const char *)PyUnicode_1BYTE_DATA(self->readnl);
if (strcmp(self->writenl, "\n") == 0) {
self->writenl = NULL;
}
}
else {
#ifdef MS_WINDOWS
self->writenl = "\r\n";
#else
self->writenl = NULL;
#endif
}
Py_XDECREF(old);
return 0;
}
static int
_textiowrapper_set_decoder(textio *self, PyObject *codec_info,
const char *errors)
{
PyObject *res;
int r;
res = PyObject_CallMethodNoArgs(self->buffer, &_Py_ID(readable));
if (res == NULL)
return -1;
r = PyObject_IsTrue(res);
Py_DECREF(res);
if (r == -1)
return -1;
if (r != 1)
return 0;
Py_CLEAR(self->decoder);
self->decoder = _PyCodecInfo_GetIncrementalDecoder(codec_info, errors);
if (self->decoder == NULL)
return -1;
if (self->readuniversal) {
_PyIO_State *state = self->state;
PyObject *incrementalDecoder = PyObject_CallFunctionObjArgs(
(PyObject *)state->PyIncrementalNewlineDecoder_Type,
self->decoder, self->readtranslate ? Py_True : Py_False, NULL);
if (incrementalDecoder == NULL)
return -1;
Py_XSETREF(self->decoder, incrementalDecoder);
}
return 0;
}
static PyObject*
_textiowrapper_decode(_PyIO_State *state, PyObject *decoder, PyObject *bytes,
int eof)
{
PyObject *chars;
if (Py_IS_TYPE(decoder, state->PyIncrementalNewlineDecoder_Type))
chars = _PyIncrementalNewlineDecoder_decode(decoder, bytes, eof);
else
chars = PyObject_CallMethodObjArgs(decoder, &_Py_ID(decode), bytes,
eof ? Py_True : Py_False, NULL);
if (check_decoded(chars) < 0)
// check_decoded already decreases refcount
return NULL;
return chars;
}
static int
_textiowrapper_set_encoder(textio *self, PyObject *codec_info,
const char *errors)
{
PyObject *res;
int r;
res = PyObject_CallMethodNoArgs(self->buffer, &_Py_ID(writable));
if (res == NULL)
return -1;
r = PyObject_IsTrue(res);
Py_DECREF(res);
if (r == -1)
return -1;
if (r != 1)
return 0;
Py_CLEAR(self->encoder);
self->encodefunc = NULL;
self->encoder = _PyCodecInfo_GetIncrementalEncoder(codec_info, errors);
if (self->encoder == NULL)
return -1;
/* Get the normalized named of the codec */
if (PyObject_GetOptionalAttr(codec_info, &_Py_ID(name), &res) < 0) {
return -1;
}
if (res != NULL && PyUnicode_Check(res)) {
const encodefuncentry *e = encodefuncs;
while (e->name != NULL) {
if (_PyUnicode_EqualToASCIIString(res, e->name)) {
self->encodefunc = e->encodefunc;
break;
}
e++;
}
}
Py_XDECREF(res);
return 0;
}
static int
_textiowrapper_fix_encoder_state(textio *self)
{
if (!self->seekable || !self->encoder) {
return 0;
}
self->encoding_start_of_stream = 1;
PyObject *cookieObj = PyObject_CallMethodNoArgs(
self->buffer, &_Py_ID(tell));
if (cookieObj == NULL) {
return -1;
}
int cmp = PyObject_RichCompareBool(cookieObj, _PyLong_GetZero(), Py_EQ);
Py_DECREF(cookieObj);
if (cmp < 0) {
return -1;
}