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3056 lines (2681 loc) · 88.2 KB
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Copy pathbytearrayobject.c
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3056 lines (2681 loc) · 88.2 KB
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/* PyBytes (bytearray) implementation */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h"
#include "bytes_methods.h"
char _PyByteArray_empty_string[] = "";
void
PyByteArray_Fini(void)
{
}
int
PyByteArray_Init(void)
{
return 1;
}
/* end nullbytes support */
/* Helpers */
static int
_getbytevalue(PyObject* arg, int *value)
{
long face_value;
if (PyBytes_CheckExact(arg)) {
if (Py_SIZE(arg) != 1) {
PyErr_SetString(PyExc_ValueError, "string must be of size 1");
return 0;
}
*value = Py_CHARMASK(((PyBytesObject*)arg)->ob_sval[0]);
return 1;
}
else if (PyInt_Check(arg) || PyLong_Check(arg)) {
face_value = PyLong_AsLong(arg);
}
else {
PyObject *index = PyNumber_Index(arg);
if (index == NULL) {
PyErr_Format(PyExc_TypeError,
"an integer or string of size 1 is required");
return 0;
}
face_value = PyLong_AsLong(index);
Py_DECREF(index);
}
if (face_value < 0 || face_value >= 256) {
/* this includes the OverflowError in case the long is too large */
PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
return 0;
}
*value = face_value;
return 1;
}
static Py_ssize_t
bytearray_buffer_getreadbuf(PyByteArrayObject *self, Py_ssize_t index, const void **ptr)
{
if ( index != 0 ) {
PyErr_SetString(PyExc_SystemError,
"accessing non-existent bytes segment");
return -1;
}
*ptr = (void *)PyByteArray_AS_STRING(self);
return Py_SIZE(self);
}
static Py_ssize_t
bytearray_buffer_getwritebuf(PyByteArrayObject *self, Py_ssize_t index, const void **ptr)
{
if ( index != 0 ) {
PyErr_SetString(PyExc_SystemError,
"accessing non-existent bytes segment");
return -1;
}
*ptr = (void *)PyByteArray_AS_STRING(self);
return Py_SIZE(self);
}
static Py_ssize_t
bytearray_buffer_getsegcount(PyByteArrayObject *self, Py_ssize_t *lenp)
{
if ( lenp )
*lenp = Py_SIZE(self);
return 1;
}
static Py_ssize_t
bytearray_buffer_getcharbuf(PyByteArrayObject *self, Py_ssize_t index, const char **ptr)
{
if ( index != 0 ) {
PyErr_SetString(PyExc_SystemError,
"accessing non-existent bytes segment");
return -1;
}
*ptr = PyByteArray_AS_STRING(self);
return Py_SIZE(self);
}
static int
bytearray_getbuffer(PyByteArrayObject *obj, Py_buffer *view, int flags)
{
int ret;
void *ptr;
if (view == NULL) {
obj->ob_exports++;
return 0;
}
ptr = (void *) PyByteArray_AS_STRING(obj);
ret = PyBuffer_FillInfo(view, (PyObject*)obj, ptr, Py_SIZE(obj), 0, flags);
if (ret >= 0) {
obj->ob_exports++;
}
return ret;
}
static void
bytearray_releasebuffer(PyByteArrayObject *obj, Py_buffer *view)
{
obj->ob_exports--;
}
static Py_ssize_t
_getbuffer(PyObject *obj, Py_buffer *view)
{
PyBufferProcs *buffer = Py_TYPE(obj)->tp_as_buffer;
if (buffer == NULL || buffer->bf_getbuffer == NULL)
{
PyErr_Format(PyExc_TypeError,
"Type %.100s doesn't support the buffer API",
Py_TYPE(obj)->tp_name);
return -1;
}
if (buffer->bf_getbuffer(obj, view, PyBUF_SIMPLE) < 0)
return -1;
return view->len;
}
static int
_canresize(PyByteArrayObject *self)
{
if (self->ob_exports > 0) {
PyErr_SetString(PyExc_BufferError,
"Existing exports of data: object cannot be re-sized");
return 0;
}
return 1;
}
/* Direct API functions */
PyObject *
PyByteArray_FromObject(PyObject *input)
{
return PyObject_CallFunctionObjArgs((PyObject *)&PyByteArray_Type,
input, NULL);
}
PyObject *
PyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)
{
PyByteArrayObject *new;
Py_ssize_t alloc;
if (size < 0) {
PyErr_SetString(PyExc_SystemError,
"Negative size passed to PyByteArray_FromStringAndSize");
return NULL;
}
new = PyObject_New(PyByteArrayObject, &PyByteArray_Type);
if (new == NULL)
return NULL;
if (size == 0) {
new->ob_bytes = NULL;
alloc = 0;
}
else {
alloc = size + 1;
new->ob_bytes = PyMem_Malloc(alloc);
if (new->ob_bytes == NULL) {
Py_DECREF(new);
return PyErr_NoMemory();
}
if (bytes != NULL && size > 0)
memcpy(new->ob_bytes, bytes, size);
new->ob_bytes[size] = '\0'; /* Trailing null byte */
}
Py_SIZE(new) = size;
new->ob_alloc = alloc;
new->ob_exports = 0;
return (PyObject *)new;
}
Py_ssize_t
PyByteArray_Size(PyObject *self)
{
assert(self != NULL);
assert(PyByteArray_Check(self));
return PyByteArray_GET_SIZE(self);
}
char *
PyByteArray_AsString(PyObject *self)
{
assert(self != NULL);
assert(PyByteArray_Check(self));
return PyByteArray_AS_STRING(self);
}
int
PyByteArray_Resize(PyObject *self, Py_ssize_t size)
{
void *sval;
Py_ssize_t alloc = ((PyByteArrayObject *)self)->ob_alloc;
assert(self != NULL);
assert(PyByteArray_Check(self));
assert(size >= 0);
if (size == Py_SIZE(self)) {
return 0;
}
if (!_canresize((PyByteArrayObject *)self)) {
return -1;
}
if (size < alloc / 2) {
/* Major downsize; resize down to exact size */
alloc = size + 1;
}
else if (size < alloc) {
/* Within allocated size; quick exit */
Py_SIZE(self) = size;
((PyByteArrayObject *)self)->ob_bytes[size] = '\0'; /* Trailing null */
return 0;
}
else if (size <= alloc * 1.125) {
/* Moderate upsize; overallocate similar to list_resize() */
alloc = size + (size >> 3) + (size < 9 ? 3 : 6);
}
else {
/* Major upsize; resize up to exact size */
alloc = size + 1;
}
sval = PyMem_Realloc(((PyByteArrayObject *)self)->ob_bytes, alloc);
if (sval == NULL) {
PyErr_NoMemory();
return -1;
}
((PyByteArrayObject *)self)->ob_bytes = sval;
Py_SIZE(self) = size;
((PyByteArrayObject *)self)->ob_alloc = alloc;
((PyByteArrayObject *)self)->ob_bytes[size] = '\0'; /* Trailing null byte */
return 0;
}
PyObject *
PyByteArray_Concat(PyObject *a, PyObject *b)
{
Py_buffer va, vb;
PyByteArrayObject *result = NULL;
va.len = -1;
vb.len = -1;
if (_getbuffer(a, &va) < 0 ||
_getbuffer(b, &vb) < 0) {
PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
goto done;
}
if (va.len > PY_SSIZE_T_MAX - vb.len) {
PyErr_NoMemory();
goto done;
}
result = (PyByteArrayObject *) \
PyByteArray_FromStringAndSize(NULL, va.len + vb.len);
if (result != NULL) {
memcpy(result->ob_bytes, va.buf, va.len);
memcpy(result->ob_bytes + va.len, vb.buf, vb.len);
}
done:
if (va.len != -1)
PyBuffer_Release(&va);
if (vb.len != -1)
PyBuffer_Release(&vb);
return (PyObject *)result;
}
/* Functions stuffed into the type object */
static Py_ssize_t
bytearray_length(PyByteArrayObject *self)
{
return Py_SIZE(self);
}
static PyObject *
bytearray_iconcat(PyByteArrayObject *self, PyObject *other)
{
Py_ssize_t mysize;
Py_ssize_t size;
Py_buffer vo;
if (_getbuffer(other, &vo) < 0) {
PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
Py_TYPE(other)->tp_name, Py_TYPE(self)->tp_name);
return NULL;
}
mysize = Py_SIZE(self);
if (mysize > PY_SSIZE_T_MAX - vo.len) {
PyBuffer_Release(&vo);
return PyErr_NoMemory();
}
size = mysize + vo.len;
if (size < self->ob_alloc) {
Py_SIZE(self) = size;
self->ob_bytes[Py_SIZE(self)] = '\0'; /* Trailing null byte */
}
else if (PyByteArray_Resize((PyObject *)self, size) < 0) {
PyBuffer_Release(&vo);
return NULL;
}
memcpy(self->ob_bytes + mysize, vo.buf, vo.len);
PyBuffer_Release(&vo);
Py_INCREF(self);
return (PyObject *)self;
}
static PyObject *
bytearray_repeat(PyByteArrayObject *self, Py_ssize_t count)
{
PyByteArrayObject *result;
Py_ssize_t mysize;
Py_ssize_t size;
if (count < 0)
count = 0;
mysize = Py_SIZE(self);
if (count != 0 && mysize > PY_SSIZE_T_MAX / count)
return PyErr_NoMemory();
size = mysize * count;
result = (PyByteArrayObject *)PyByteArray_FromStringAndSize(NULL, size);
if (result != NULL && size != 0) {
if (mysize == 1)
memset(result->ob_bytes, self->ob_bytes[0], size);
else {
Py_ssize_t i;
for (i = 0; i < count; i++)
memcpy(result->ob_bytes + i*mysize, self->ob_bytes, mysize);
}
}
return (PyObject *)result;
}
static PyObject *
bytearray_irepeat(PyByteArrayObject *self, Py_ssize_t count)
{
Py_ssize_t mysize;
Py_ssize_t size;
if (count < 0)
count = 0;
mysize = Py_SIZE(self);
if (count != 0 && mysize > PY_SSIZE_T_MAX / count)
return PyErr_NoMemory();
size = mysize * count;
if (size < self->ob_alloc) {
Py_SIZE(self) = size;
self->ob_bytes[Py_SIZE(self)] = '\0'; /* Trailing null byte */
}
else if (PyByteArray_Resize((PyObject *)self, size) < 0)
return NULL;
if (mysize == 1)
memset(self->ob_bytes, self->ob_bytes[0], size);
else {
Py_ssize_t i;
for (i = 1; i < count; i++)
memcpy(self->ob_bytes + i*mysize, self->ob_bytes, mysize);
}
Py_INCREF(self);
return (PyObject *)self;
}
static PyObject *
bytearray_getitem(PyByteArrayObject *self, Py_ssize_t i)
{
if (i < 0)
i += Py_SIZE(self);
if (i < 0 || i >= Py_SIZE(self)) {
PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
return NULL;
}
return PyInt_FromLong((unsigned char)(self->ob_bytes[i]));
}
static PyObject *
bytearray_subscript(PyByteArrayObject *self, PyObject *index)
{
if (PyIndex_Check(index)) {
Py_ssize_t i = PyNumber_AsSsize_t(index, PyExc_IndexError);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)
i += PyByteArray_GET_SIZE(self);
if (i < 0 || i >= Py_SIZE(self)) {
PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
return NULL;
}
return PyInt_FromLong((unsigned char)(self->ob_bytes[i]));
}
else if (PySlice_Check(index)) {
Py_ssize_t start, stop, step, slicelength, cur, i;
if (_PySlice_Unpack((PySliceObject *)index, &start, &stop, &step) < 0) {
return NULL;
}
slicelength = _PySlice_AdjustIndices(PyByteArray_GET_SIZE(self),
&start, &stop, step);
if (slicelength <= 0)
return PyByteArray_FromStringAndSize("", 0);
else if (step == 1) {
return PyByteArray_FromStringAndSize(self->ob_bytes + start,
slicelength);
}
else {
char *source_buf = PyByteArray_AS_STRING(self);
char *result_buf = (char *)PyMem_Malloc(slicelength);
PyObject *result;
if (result_buf == NULL)
return PyErr_NoMemory();
for (cur = start, i = 0; i < slicelength;
cur += step, i++) {
result_buf[i] = source_buf[cur];
}
result = PyByteArray_FromStringAndSize(result_buf, slicelength);
PyMem_Free(result_buf);
return result;
}
}
else {
PyErr_SetString(PyExc_TypeError, "bytearray indices must be integers");
return NULL;
}
}
static int
bytearray_setslice(PyByteArrayObject *self, Py_ssize_t lo, Py_ssize_t hi,
PyObject *values)
{
Py_ssize_t avail, needed;
void *bytes;
Py_buffer vbytes;
int res = 0;
vbytes.len = -1;
if (values == (PyObject *)self) {
/* Make a copy and call this function recursively */
int err;
values = PyByteArray_FromObject(values);
if (values == NULL)
return -1;
err = bytearray_setslice(self, lo, hi, values);
Py_DECREF(values);
return err;
}
if (values == NULL) {
/* del b[lo:hi] */
bytes = NULL;
needed = 0;
}
else {
if (_getbuffer(values, &vbytes) < 0) {
PyErr_Format(PyExc_TypeError,
"can't set bytearray slice from %.100s",
Py_TYPE(values)->tp_name);
return -1;
}
needed = vbytes.len;
bytes = vbytes.buf;
}
if (lo < 0)
lo = 0;
if (hi < lo)
hi = lo;
if (hi > Py_SIZE(self))
hi = Py_SIZE(self);
avail = hi - lo;
if (avail < 0)
lo = hi = avail = 0;
if (avail != needed) {
if (avail > needed) {
if (!_canresize(self)) {
res = -1;
goto finish;
}
/*
0 lo hi old_size
| |<----avail----->|<-----tomove------>|
| |<-needed->|<-----tomove------>|
0 lo new_hi new_size
*/
memmove(self->ob_bytes + lo + needed, self->ob_bytes + hi,
Py_SIZE(self) - hi);
}
/* XXX(nnorwitz): need to verify this can't overflow! */
if (PyByteArray_Resize((PyObject *)self,
Py_SIZE(self) + needed - avail) < 0) {
res = -1;
goto finish;
}
if (avail < needed) {
/*
0 lo hi old_size
| |<-avail->|<-----tomove------>|
| |<----needed---->|<-----tomove------>|
0 lo new_hi new_size
*/
memmove(self->ob_bytes + lo + needed, self->ob_bytes + hi,
Py_SIZE(self) - lo - needed);
}
}
if (needed > 0)
memcpy(self->ob_bytes + lo, bytes, needed);
finish:
if (vbytes.len != -1)
PyBuffer_Release(&vbytes);
return res;
}
static int
bytearray_setitem(PyByteArrayObject *self, Py_ssize_t i, PyObject *value)
{
int ival;
if (i < 0)
i += Py_SIZE(self);
if (i < 0 || i >= Py_SIZE(self)) {
PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
return -1;
}
if (value == NULL)
return bytearray_setslice(self, i, i+1, NULL);
if (!_getbytevalue(value, &ival))
return -1;
self->ob_bytes[i] = ival;
return 0;
}
static int
bytearray_ass_subscript(PyByteArrayObject *self, PyObject *index, PyObject *values)
{
Py_ssize_t start, stop, step, slicelen, needed;
char *bytes;
if (PyIndex_Check(index)) {
Py_ssize_t i = PyNumber_AsSsize_t(index, PyExc_IndexError);
if (i == -1 && PyErr_Occurred())
return -1;
if (i < 0)
i += PyByteArray_GET_SIZE(self);
if (i < 0 || i >= Py_SIZE(self)) {
PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
return -1;
}
if (values == NULL) {
/* Fall through to slice assignment */
start = i;
stop = i + 1;
step = 1;
slicelen = 1;
}
else {
int ival;
if (!_getbytevalue(values, &ival))
return -1;
self->ob_bytes[i] = (char)ival;
return 0;
}
}
else if (PySlice_Check(index)) {
if (_PySlice_Unpack((PySliceObject *)index, &start, &stop, &step) < 0) {
return -1;
}
slicelen = _PySlice_AdjustIndices(PyByteArray_GET_SIZE(self), &start,
&stop, step);
}
else {
PyErr_SetString(PyExc_TypeError, "bytearray indices must be integer");
return -1;
}
if (values == NULL) {
bytes = NULL;
needed = 0;
}
else if (values == (PyObject *)self || !PyByteArray_Check(values)) {
int err;
if (PyNumber_Check(values) || PyUnicode_Check(values)) {
PyErr_SetString(PyExc_TypeError,
"can assign only bytes, buffers, or iterables "
"of ints in range(0, 256)");
return -1;
}
/* Make a copy and call this function recursively */
values = PyByteArray_FromObject(values);
if (values == NULL)
return -1;
err = bytearray_ass_subscript(self, index, values);
Py_DECREF(values);
return err;
}
else {
assert(PyByteArray_Check(values));
bytes = ((PyByteArrayObject *)values)->ob_bytes;
needed = Py_SIZE(values);
}
/* Make sure b[5:2] = ... inserts before 5, not before 2. */
if ((step < 0 && start < stop) ||
(step > 0 && start > stop))
stop = start;
if (step == 1) {
if (slicelen != needed) {
if (!_canresize(self))
return -1;
if (slicelen > needed) {
/*
0 start stop old_size
| |<---slicelen--->|<-----tomove------>|
| |<-needed->|<-----tomove------>|
0 lo new_hi new_size
*/
memmove(self->ob_bytes + start + needed, self->ob_bytes + stop,
Py_SIZE(self) - stop);
}
if (PyByteArray_Resize((PyObject *)self,
Py_SIZE(self) + needed - slicelen) < 0)
return -1;
if (slicelen < needed) {
/*
0 lo hi old_size
| |<-avail->|<-----tomove------>|
| |<----needed---->|<-----tomove------>|
0 lo new_hi new_size
*/
memmove(self->ob_bytes + start + needed, self->ob_bytes + stop,
Py_SIZE(self) - start - needed);
}
}
if (needed > 0)
memcpy(self->ob_bytes + start, bytes, needed);
return 0;
}
else {
if (needed == 0) {
/* Delete slice */
size_t cur;
Py_ssize_t i;
if (!_canresize(self))
return -1;
if (step < 0) {
stop = start + 1;
start = stop + step * (slicelen - 1) - 1;
step = -step;
}
for (cur = start, i = 0;
i < slicelen; cur += step, i++) {
Py_ssize_t lim = step - 1;
if (cur + step >= (size_t)PyByteArray_GET_SIZE(self))
lim = PyByteArray_GET_SIZE(self) - cur - 1;
memmove(self->ob_bytes + cur - i,
self->ob_bytes + cur + 1, lim);
}
/* Move the tail of the bytes, in one chunk */
cur = start + slicelen*step;
if (cur < (size_t)PyByteArray_GET_SIZE(self)) {
memmove(self->ob_bytes + cur - slicelen,
self->ob_bytes + cur,
PyByteArray_GET_SIZE(self) - cur);
}
if (PyByteArray_Resize((PyObject *)self,
PyByteArray_GET_SIZE(self) - slicelen) < 0)
return -1;
return 0;
}
else {
/* Assign slice */
Py_ssize_t cur, i;
if (needed != slicelen) {
PyErr_Format(PyExc_ValueError,
"attempt to assign bytes of size %zd "
"to extended slice of size %zd",
needed, slicelen);
return -1;
}
for (cur = start, i = 0; i < slicelen; cur += step, i++)
self->ob_bytes[cur] = bytes[i];
return 0;
}
}
}
static int
bytearray_init(PyByteArrayObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"source", "encoding", "errors", 0};
PyObject *arg = NULL;
const char *encoding = NULL;
const char *errors = NULL;
Py_ssize_t count;
PyObject *it;
PyObject *(*iternext)(PyObject *);
if (Py_SIZE(self) != 0) {
/* Empty previous contents (yes, do this first of all!) */
if (PyByteArray_Resize((PyObject *)self, 0) < 0)
return -1;
}
/* Parse arguments */
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oss:bytearray", kwlist,
&arg, &encoding, &errors))
return -1;
/* Make a quick exit if no first argument */
if (arg == NULL) {
if (encoding != NULL || errors != NULL) {
PyErr_SetString(PyExc_TypeError,
"encoding or errors without sequence argument");
return -1;
}
return 0;
}
if (PyBytes_Check(arg)) {
PyObject *new, *encoded;
if (encoding != NULL) {
encoded = _PyCodec_EncodeText(arg, encoding, errors);
if (encoded == NULL)
return -1;
assert(PyBytes_Check(encoded));
}
else {
encoded = arg;
Py_INCREF(arg);
}
new = bytearray_iconcat(self, arg);
Py_DECREF(encoded);
if (new == NULL)
return -1;
Py_DECREF(new);
return 0;
}
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(arg)) {
/* Encode via the codec registry */
PyObject *encoded, *new;
if (encoding == NULL) {
PyErr_SetString(PyExc_TypeError,
"unicode argument without an encoding");
return -1;
}
encoded = _PyCodec_EncodeText(arg, encoding, errors);
if (encoded == NULL)
return -1;
assert(PyBytes_Check(encoded));
new = bytearray_iconcat(self, encoded);
Py_DECREF(encoded);
if (new == NULL)
return -1;
Py_DECREF(new);
return 0;
}
#endif
/* If it's not unicode, there can't be encoding or errors */
if (encoding != NULL || errors != NULL) {
PyErr_SetString(PyExc_TypeError,
"encoding or errors without a string argument");
return -1;
}
/* Is it an int? */
count = PyNumber_AsSsize_t(arg, PyExc_OverflowError);
if (count == -1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
return -1;
PyErr_Clear();
}
else if (count < 0) {
PyErr_SetString(PyExc_ValueError, "negative count");
return -1;
}
else {
if (count > 0) {
if (PyByteArray_Resize((PyObject *)self, count))
return -1;
memset(self->ob_bytes, 0, count);
}
return 0;
}
/* Use the buffer API */
if (PyObject_CheckBuffer(arg)) {
Py_ssize_t size;
Py_buffer view;
if (PyObject_GetBuffer(arg, &view, PyBUF_FULL_RO) < 0)
return -1;
size = view.len;
if (PyByteArray_Resize((PyObject *)self, size) < 0) goto fail;
if (PyBuffer_ToContiguous(self->ob_bytes, &view, size, 'C') < 0)
goto fail;
PyBuffer_Release(&view);
return 0;
fail:
PyBuffer_Release(&view);
return -1;
}
/* XXX Optimize this if the arguments is a list, tuple */
/* Get the iterator */
it = PyObject_GetIter(arg);
if (it == NULL)
return -1;
iternext = *Py_TYPE(it)->tp_iternext;
/* Run the iterator to exhaustion */
for (;;) {
PyObject *item;
int rc, value;
/* Get the next item */
item = iternext(it);
if (item == NULL) {
if (PyErr_Occurred()) {
if (!PyErr_ExceptionMatches(PyExc_StopIteration))
goto error;
PyErr_Clear();
}
break;
}
/* Interpret it as an int (__index__) */
rc = _getbytevalue(item, &value);
Py_DECREF(item);
if (!rc)
goto error;
/* Append the byte */
if (Py_SIZE(self) + 1 < self->ob_alloc) {
Py_SIZE(self)++;
PyByteArray_AS_STRING(self)[Py_SIZE(self)] = '\0';
}
else if (PyByteArray_Resize((PyObject *)self, Py_SIZE(self)+1) < 0)
goto error;
self->ob_bytes[Py_SIZE(self)-1] = value;
}
/* Clean up and return success */
Py_DECREF(it);
return 0;
error:
/* Error handling when it != NULL */
Py_DECREF(it);
return -1;
}
/* Mostly copied from string_repr, but without the
"smart quote" functionality. */
static PyObject *
bytearray_repr(PyByteArrayObject *self)
{
static const char *hexdigits = "0123456789abcdef";
const char *quote_prefix = "bytearray(b";
const char *quote_postfix = ")";
Py_ssize_t length = Py_SIZE(self);
/* 14 == strlen(quote_prefix) + 2 + strlen(quote_postfix) */
size_t newsize;
PyObject *v;
if (length > (PY_SSIZE_T_MAX - 14) / 4) {
PyErr_SetString(PyExc_OverflowError,
"bytearray object is too large to make repr");
return NULL;
}
newsize = 14 + 4 * length;
v = PyString_FromStringAndSize(NULL, newsize);
if (v == NULL) {
return NULL;
}
else {
register Py_ssize_t i;
register char c;
register char *p;
int quote;
/* Figure out which quote to use; single is preferred */
quote = '\'';
{
char *test, *start;
start = PyByteArray_AS_STRING(self);
for (test = start; test < start+length; ++test) {
if (*test == '"') {
quote = '\''; /* back to single */
goto decided;
}
else if (*test == '\'')
quote = '"';
}
decided:
;
}
p = PyString_AS_STRING(v);
while (*quote_prefix)
*p++ = *quote_prefix++;
*p++ = quote;
for (i = 0; i < length; i++) {
/* There's at least enough room for a hex escape
and a closing quote. */
assert(newsize - (p - PyString_AS_STRING(v)) >= 5);
c = self->ob_bytes[i];
if (c == '\'' || c == '\\')
*p++ = '\\', *p++ = c;
else if (c == '\t')
*p++ = '\\', *p++ = 't';
else if (c == '\n')
*p++ = '\\', *p++ = 'n';
else if (c == '\r')
*p++ = '\\', *p++ = 'r';
else if (c == 0)
*p++ = '\\', *p++ = 'x', *p++ = '0', *p++ = '0';
else if (c < ' ' || c >= 0x7f) {
*p++ = '\\';
*p++ = 'x';
*p++ = hexdigits[(c & 0xf0) >> 4];
*p++ = hexdigits[c & 0xf];
}
else
*p++ = c;
}
assert(newsize - (p - PyString_AS_STRING(v)) >= 1);
*p++ = quote;
while (*quote_postfix) {
*p++ = *quote_postfix++;
}
*p = '\0';
/* v is cleared on error */
(void)_PyString_Resize(&v, (p - PyString_AS_STRING(v)));
return v;