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Copy patharraymodule.c
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3043 lines (2702 loc) · 86.6 KB
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/* Array object implementation */
/* An array is a uniform list -- all items have the same type.
The item type is restricted to simple C types like int or float */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h"
#ifdef STDC_HEADERS
#include <stddef.h>
#else /* !STDC_HEADERS */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h> /* For size_t */
#endif /* HAVE_SYS_TYPES_H */
#endif /* !STDC_HEADERS */
/*[clinic input]
module array
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=7d1b8d7f5958fd83]*/
struct arrayobject; /* Forward */
/* All possible arraydescr values are defined in the vector "descriptors"
* below. That's defined later because the appropriate get and set
* functions aren't visible yet.
*/
struct arraydescr {
char typecode;
int itemsize;
PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);
int (*setitem)(struct arrayobject *, Py_ssize_t, PyObject *);
char *formats;
int is_integer_type;
int is_signed;
};
typedef struct arrayobject {
PyObject_VAR_HEAD
char *ob_item;
Py_ssize_t allocated;
struct arraydescr *ob_descr;
PyObject *weakreflist; /* List of weak references */
int ob_exports; /* Number of exported buffers */
} arrayobject;
static PyTypeObject Arraytype;
typedef struct {
PyObject_HEAD
Py_ssize_t index;
arrayobject *ao;
PyObject* (*getitem)(struct arrayobject *, Py_ssize_t);
} arrayiterobject;
static PyTypeObject PyArrayIter_Type;
#define PyArrayIter_Check(op) PyObject_TypeCheck(op, &PyArrayIter_Type)
enum machine_format_code {
UNKNOWN_FORMAT = -1,
/* UNKNOWN_FORMAT is used to indicate that the machine format for an
* array type code cannot be interpreted. When this occurs, a list of
* Python objects is used to represent the content of the array
* instead of using the memory content of the array directly. In that
* case, the array_reconstructor mechanism is bypassed completely, and
* the standard array constructor is used instead.
*
* This is will most likely occur when the machine doesn't use IEEE
* floating-point numbers.
*/
UNSIGNED_INT8 = 0,
SIGNED_INT8 = 1,
UNSIGNED_INT16_LE = 2,
UNSIGNED_INT16_BE = 3,
SIGNED_INT16_LE = 4,
SIGNED_INT16_BE = 5,
UNSIGNED_INT32_LE = 6,
UNSIGNED_INT32_BE = 7,
SIGNED_INT32_LE = 8,
SIGNED_INT32_BE = 9,
UNSIGNED_INT64_LE = 10,
UNSIGNED_INT64_BE = 11,
SIGNED_INT64_LE = 12,
SIGNED_INT64_BE = 13,
IEEE_754_FLOAT_LE = 14,
IEEE_754_FLOAT_BE = 15,
IEEE_754_DOUBLE_LE = 16,
IEEE_754_DOUBLE_BE = 17,
UTF16_LE = 18,
UTF16_BE = 19,
UTF32_LE = 20,
UTF32_BE = 21
};
#define MACHINE_FORMAT_CODE_MIN 0
#define MACHINE_FORMAT_CODE_MAX 21
/*
* Must come after arrayobject, arrayiterobject,
* and enum machine_code_type definitions.
*/
#include "clinic/arraymodule.c.h"
#define array_Check(op) PyObject_TypeCheck(op, &Arraytype)
#define array_CheckExact(op) (Py_TYPE(op) == &Arraytype)
static int
array_resize(arrayobject *self, Py_ssize_t newsize)
{
char *items;
size_t _new_size;
if (self->ob_exports > 0 && newsize != Py_SIZE(self)) {
PyErr_SetString(PyExc_BufferError,
"cannot resize an array that is exporting buffers");
return -1;
}
/* Bypass realloc() when a previous overallocation is large enough
to accommodate the newsize. If the newsize is 16 smaller than the
current size, then proceed with the realloc() to shrink the array.
*/
if (self->allocated >= newsize &&
Py_SIZE(self) < newsize + 16 &&
self->ob_item != NULL) {
Py_SIZE(self) = newsize;
return 0;
}
if (newsize == 0) {
PyMem_FREE(self->ob_item);
self->ob_item = NULL;
Py_SIZE(self) = 0;
self->allocated = 0;
return 0;
}
/* This over-allocates proportional to the array size, making room
* for additional growth. The over-allocation is mild, but is
* enough to give linear-time amortized behavior over a long
* sequence of appends() in the presence of a poorly-performing
* system realloc().
* The growth pattern is: 0, 4, 8, 16, 25, 34, 46, 56, 67, 79, ...
* Note, the pattern starts out the same as for lists but then
* grows at a smaller rate so that larger arrays only overallocate
* by about 1/16th -- this is done because arrays are presumed to be more
* memory critical.
*/
_new_size = (newsize >> 4) + (Py_SIZE(self) < 8 ? 3 : 7) + newsize;
items = self->ob_item;
/* XXX The following multiplication and division does not optimize away
like it does for lists since the size is not known at compile time */
if (_new_size <= ((~(size_t)0) / self->ob_descr->itemsize))
PyMem_RESIZE(items, char, (_new_size * self->ob_descr->itemsize));
else
items = NULL;
if (items == NULL) {
PyErr_NoMemory();
return -1;
}
self->ob_item = items;
Py_SIZE(self) = newsize;
self->allocated = _new_size;
return 0;
}
/****************************************************************************
Get and Set functions for each type.
A Get function takes an arrayobject* and an integer index, returning the
array value at that index wrapped in an appropriate PyObject*.
A Set function takes an arrayobject, integer index, and PyObject*; sets
the array value at that index to the raw C data extracted from the PyObject*,
and returns 0 if successful, else nonzero on failure (PyObject* not of an
appropriate type or value).
Note that the basic Get and Set functions do NOT check that the index is
in bounds; that's the responsibility of the caller.
****************************************************************************/
static PyObject *
b_getitem(arrayobject *ap, Py_ssize_t i)
{
long x = ((char *)ap->ob_item)[i];
if (x >= 128)
x -= 256;
return PyLong_FromLong(x);
}
static int
b_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
short x;
/* PyArg_Parse's 'b' formatter is for an unsigned char, therefore
must use the next size up that is signed ('h') and manually do
the overflow checking */
if (!PyArg_Parse(v, "h;array item must be integer", &x))
return -1;
else if (x < -128) {
PyErr_SetString(PyExc_OverflowError,
"signed char is less than minimum");
return -1;
}
else if (x > 127) {
PyErr_SetString(PyExc_OverflowError,
"signed char is greater than maximum");
return -1;
}
if (i >= 0)
((char *)ap->ob_item)[i] = (char)x;
return 0;
}
static PyObject *
BB_getitem(arrayobject *ap, Py_ssize_t i)
{
long x = ((unsigned char *)ap->ob_item)[i];
return PyLong_FromLong(x);
}
static int
BB_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned char x;
/* 'B' == unsigned char, maps to PyArg_Parse's 'b' formatter */
if (!PyArg_Parse(v, "b;array item must be integer", &x))
return -1;
if (i >= 0)
((char *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
u_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyUnicode_FromUnicode(&((Py_UNICODE *) ap->ob_item)[i], 1);
}
static int
u_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
Py_UNICODE *p;
Py_ssize_t len;
if (!PyArg_Parse(v, "u#;array item must be unicode character", &p, &len))
return -1;
if (len != 1) {
PyErr_SetString(PyExc_TypeError,
"array item must be unicode character");
return -1;
}
if (i >= 0)
((Py_UNICODE *)ap->ob_item)[i] = p[0];
return 0;
}
static PyObject *
h_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong((long) ((short *)ap->ob_item)[i]);
}
static int
h_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
short x;
/* 'h' == signed short, maps to PyArg_Parse's 'h' formatter */
if (!PyArg_Parse(v, "h;array item must be integer", &x))
return -1;
if (i >= 0)
((short *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
HH_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong((long) ((unsigned short *)ap->ob_item)[i]);
}
static int
HH_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
int x;
/* PyArg_Parse's 'h' formatter is for a signed short, therefore
must use the next size up and manually do the overflow checking */
if (!PyArg_Parse(v, "i;array item must be integer", &x))
return -1;
else if (x < 0) {
PyErr_SetString(PyExc_OverflowError,
"unsigned short is less than minimum");
return -1;
}
else if (x > USHRT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"unsigned short is greater than maximum");
return -1;
}
if (i >= 0)
((short *)ap->ob_item)[i] = (short)x;
return 0;
}
static PyObject *
i_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong((long) ((int *)ap->ob_item)[i]);
}
static int
i_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
int x;
/* 'i' == signed int, maps to PyArg_Parse's 'i' formatter */
if (!PyArg_Parse(v, "i;array item must be integer", &x))
return -1;
if (i >= 0)
((int *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
II_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromUnsignedLong(
(unsigned long) ((unsigned int *)ap->ob_item)[i]);
}
static int
II_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned long x;
if (PyLong_Check(v)) {
x = PyLong_AsUnsignedLong(v);
if (x == (unsigned long) -1 && PyErr_Occurred())
return -1;
}
else {
long y;
if (!PyArg_Parse(v, "l;array item must be integer", &y))
return -1;
if (y < 0) {
PyErr_SetString(PyExc_OverflowError,
"unsigned int is less than minimum");
return -1;
}
x = (unsigned long)y;
}
if (x > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"unsigned int is greater than maximum");
return -1;
}
if (i >= 0)
((unsigned int *)ap->ob_item)[i] = (unsigned int)x;
return 0;
}
static PyObject *
l_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong(((long *)ap->ob_item)[i]);
}
static int
l_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
long x;
if (!PyArg_Parse(v, "l;array item must be integer", &x))
return -1;
if (i >= 0)
((long *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
LL_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromUnsignedLong(((unsigned long *)ap->ob_item)[i]);
}
static int
LL_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned long x;
if (PyLong_Check(v)) {
x = PyLong_AsUnsignedLong(v);
if (x == (unsigned long) -1 && PyErr_Occurred())
return -1;
}
else {
long y;
if (!PyArg_Parse(v, "l;array item must be integer", &y))
return -1;
if (y < 0) {
PyErr_SetString(PyExc_OverflowError,
"unsigned long is less than minimum");
return -1;
}
x = (unsigned long)y;
}
if (x > ULONG_MAX) {
PyErr_SetString(PyExc_OverflowError,
"unsigned long is greater than maximum");
return -1;
}
if (i >= 0)
((unsigned long *)ap->ob_item)[i] = x;
return 0;
}
#ifdef HAVE_LONG_LONG
static PyObject *
q_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLongLong(((PY_LONG_LONG *)ap->ob_item)[i]);
}
static int
q_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
PY_LONG_LONG x;
if (!PyArg_Parse(v, "L;array item must be integer", &x))
return -1;
if (i >= 0)
((PY_LONG_LONG *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
QQ_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromUnsignedLongLong(
((unsigned PY_LONG_LONG *)ap->ob_item)[i]);
}
static int
QQ_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned PY_LONG_LONG x;
if (PyLong_Check(v)) {
x = PyLong_AsUnsignedLongLong(v);
if (x == (unsigned PY_LONG_LONG) -1 && PyErr_Occurred())
return -1;
}
else {
PY_LONG_LONG y;
if (!PyArg_Parse(v, "L;array item must be integer", &y))
return -1;
if (y < 0) {
PyErr_SetString(PyExc_OverflowError,
"unsigned long long is less than minimum");
return -1;
}
x = (unsigned PY_LONG_LONG)y;
}
if (i >= 0)
((unsigned PY_LONG_LONG *)ap->ob_item)[i] = x;
return 0;
}
#endif
static PyObject *
f_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyFloat_FromDouble((double) ((float *)ap->ob_item)[i]);
}
static int
f_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
float x;
if (!PyArg_Parse(v, "f;array item must be float", &x))
return -1;
if (i >= 0)
((float *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
d_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyFloat_FromDouble(((double *)ap->ob_item)[i]);
}
static int
d_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
double x;
if (!PyArg_Parse(v, "d;array item must be float", &x))
return -1;
if (i >= 0)
((double *)ap->ob_item)[i] = x;
return 0;
}
/* Description of types.
*
* Don't forget to update typecode_to_mformat_code() if you add a new
* typecode.
*/
static struct arraydescr descriptors[] = {
{'b', 1, b_getitem, b_setitem, "b", 1, 1},
{'B', 1, BB_getitem, BB_setitem, "B", 1, 0},
{'u', sizeof(Py_UNICODE), u_getitem, u_setitem, "u", 0, 0},
{'h', sizeof(short), h_getitem, h_setitem, "h", 1, 1},
{'H', sizeof(short), HH_getitem, HH_setitem, "H", 1, 0},
{'i', sizeof(int), i_getitem, i_setitem, "i", 1, 1},
{'I', sizeof(int), II_getitem, II_setitem, "I", 1, 0},
{'l', sizeof(long), l_getitem, l_setitem, "l", 1, 1},
{'L', sizeof(long), LL_getitem, LL_setitem, "L", 1, 0},
#ifdef HAVE_LONG_LONG
{'q', sizeof(PY_LONG_LONG), q_getitem, q_setitem, "q", 1, 1},
{'Q', sizeof(PY_LONG_LONG), QQ_getitem, QQ_setitem, "Q", 1, 0},
#endif
{'f', sizeof(float), f_getitem, f_setitem, "f", 0, 0},
{'d', sizeof(double), d_getitem, d_setitem, "d", 0, 0},
{'\0', 0, 0, 0, 0, 0, 0} /* Sentinel */
};
/****************************************************************************
Implementations of array object methods.
****************************************************************************/
/*[clinic input]
class array.array "arrayobject *" "&Arraytype"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=ad43d37e942a8854]*/
static PyObject *
newarrayobject(PyTypeObject *type, Py_ssize_t size, struct arraydescr *descr)
{
arrayobject *op;
size_t nbytes;
if (size < 0) {
PyErr_BadInternalCall();
return NULL;
}
/* Check for overflow */
if (size > PY_SSIZE_T_MAX / descr->itemsize) {
return PyErr_NoMemory();
}
nbytes = size * descr->itemsize;
op = (arrayobject *) type->tp_alloc(type, 0);
if (op == NULL) {
return NULL;
}
op->ob_descr = descr;
op->allocated = size;
op->weakreflist = NULL;
Py_SIZE(op) = size;
if (size <= 0) {
op->ob_item = NULL;
}
else {
op->ob_item = PyMem_NEW(char, nbytes);
if (op->ob_item == NULL) {
Py_DECREF(op);
return PyErr_NoMemory();
}
}
op->ob_exports = 0;
return (PyObject *) op;
}
static PyObject *
getarrayitem(PyObject *op, Py_ssize_t i)
{
arrayobject *ap;
assert(array_Check(op));
ap = (arrayobject *)op;
assert(i>=0 && i<Py_SIZE(ap));
return (*ap->ob_descr->getitem)(ap, i);
}
static int
ins1(arrayobject *self, Py_ssize_t where, PyObject *v)
{
char *items;
Py_ssize_t n = Py_SIZE(self);
if (v == NULL) {
PyErr_BadInternalCall();
return -1;
}
if ((*self->ob_descr->setitem)(self, -1, v) < 0)
return -1;
if (array_resize(self, n+1) == -1)
return -1;
items = self->ob_item;
if (where < 0) {
where += n;
if (where < 0)
where = 0;
}
if (where > n)
where = n;
/* appends don't need to call memmove() */
if (where != n)
memmove(items + (where+1)*self->ob_descr->itemsize,
items + where*self->ob_descr->itemsize,
(n-where)*self->ob_descr->itemsize);
return (*self->ob_descr->setitem)(self, where, v);
}
/* Methods */
static void
array_dealloc(arrayobject *op)
{
if (op->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *) op);
if (op->ob_item != NULL)
PyMem_DEL(op->ob_item);
Py_TYPE(op)->tp_free((PyObject *)op);
}
static PyObject *
array_richcompare(PyObject *v, PyObject *w, int op)
{
arrayobject *va, *wa;
PyObject *vi = NULL;
PyObject *wi = NULL;
Py_ssize_t i, k;
PyObject *res;
if (!array_Check(v) || !array_Check(w))
Py_RETURN_NOTIMPLEMENTED;
va = (arrayobject *)v;
wa = (arrayobject *)w;
if (Py_SIZE(va) != Py_SIZE(wa) && (op == Py_EQ || op == Py_NE)) {
/* Shortcut: if the lengths differ, the arrays differ */
if (op == Py_EQ)
res = Py_False;
else
res = Py_True;
Py_INCREF(res);
return res;
}
/* Search for the first index where items are different */
k = 1;
for (i = 0; i < Py_SIZE(va) && i < Py_SIZE(wa); i++) {
vi = getarrayitem(v, i);
wi = getarrayitem(w, i);
if (vi == NULL || wi == NULL) {
Py_XDECREF(vi);
Py_XDECREF(wi);
return NULL;
}
k = PyObject_RichCompareBool(vi, wi, Py_EQ);
if (k == 0)
break; /* Keeping vi and wi alive! */
Py_DECREF(vi);
Py_DECREF(wi);
if (k < 0)
return NULL;
}
if (k) {
/* No more items to compare -- compare sizes */
Py_ssize_t vs = Py_SIZE(va);
Py_ssize_t ws = Py_SIZE(wa);
int cmp;
switch (op) {
case Py_LT: cmp = vs < ws; break;
case Py_LE: cmp = vs <= ws; break;
case Py_EQ: cmp = vs == ws; break;
case Py_NE: cmp = vs != ws; break;
case Py_GT: cmp = vs > ws; break;
case Py_GE: cmp = vs >= ws; break;
default: return NULL; /* cannot happen */
}
if (cmp)
res = Py_True;
else
res = Py_False;
Py_INCREF(res);
return res;
}
/* We have an item that differs. First, shortcuts for EQ/NE */
if (op == Py_EQ) {
Py_INCREF(Py_False);
res = Py_False;
}
else if (op == Py_NE) {
Py_INCREF(Py_True);
res = Py_True;
}
else {
/* Compare the final item again using the proper operator */
res = PyObject_RichCompare(vi, wi, op);
}
Py_DECREF(vi);
Py_DECREF(wi);
return res;
}
static Py_ssize_t
array_length(arrayobject *a)
{
return Py_SIZE(a);
}
static PyObject *
array_item(arrayobject *a, Py_ssize_t i)
{
if (i < 0 || i >= Py_SIZE(a)) {
PyErr_SetString(PyExc_IndexError, "array index out of range");
return NULL;
}
return getarrayitem((PyObject *)a, i);
}
static PyObject *
array_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh)
{
arrayobject *np;
if (ilow < 0)
ilow = 0;
else if (ilow > Py_SIZE(a))
ilow = Py_SIZE(a);
if (ihigh < 0)
ihigh = 0;
if (ihigh < ilow)
ihigh = ilow;
else if (ihigh > Py_SIZE(a))
ihigh = Py_SIZE(a);
np = (arrayobject *) newarrayobject(&Arraytype, ihigh - ilow, a->ob_descr);
if (np == NULL)
return NULL;
memcpy(np->ob_item, a->ob_item + ilow * a->ob_descr->itemsize,
(ihigh-ilow) * a->ob_descr->itemsize);
return (PyObject *)np;
}
/*[clinic input]
array.array.__copy__
Return a copy of the array.
[clinic start generated code]*/
static PyObject *
array_array___copy___impl(arrayobject *self)
/*[clinic end generated code: output=dec7c3f925d9619e input=ad1ee5b086965f09]*/
{
return array_slice(self, 0, Py_SIZE(self));
}
/*[clinic input]
array.array.__deepcopy__
unused: object
/
Return a copy of the array.
[clinic start generated code]*/
static PyObject *
array_array___deepcopy__(arrayobject *self, PyObject *unused)
/*[clinic end generated code: output=1ec748d8e14a9faa input=2405ecb4933748c4]*/
{
return array_array___copy___impl(self);
}
static PyObject *
array_concat(arrayobject *a, PyObject *bb)
{
Py_ssize_t size;
arrayobject *np;
if (!array_Check(bb)) {
PyErr_Format(PyExc_TypeError,
"can only append array (not \"%.200s\") to array",
Py_TYPE(bb)->tp_name);
return NULL;
}
#define b ((arrayobject *)bb)
if (a->ob_descr != b->ob_descr) {
PyErr_BadArgument();
return NULL;
}
if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) {
return PyErr_NoMemory();
}
size = Py_SIZE(a) + Py_SIZE(b);
np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
if (np == NULL) {
return NULL;
}
memcpy(np->ob_item, a->ob_item, Py_SIZE(a)*a->ob_descr->itemsize);
memcpy(np->ob_item + Py_SIZE(a)*a->ob_descr->itemsize,
b->ob_item, Py_SIZE(b)*b->ob_descr->itemsize);
return (PyObject *)np;
#undef b
}
static PyObject *
array_repeat(arrayobject *a, Py_ssize_t n)
{
Py_ssize_t size;
arrayobject *np;
Py_ssize_t oldbytes, newbytes;
if (n < 0)
n = 0;
if ((Py_SIZE(a) != 0) && (n > PY_SSIZE_T_MAX / Py_SIZE(a))) {
return PyErr_NoMemory();
}
size = Py_SIZE(a) * n;
np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
if (np == NULL)
return NULL;
if (n == 0)
return (PyObject *)np;
oldbytes = Py_SIZE(a) * a->ob_descr->itemsize;
newbytes = oldbytes * n;
/* this follows the code in unicode_repeat */
if (oldbytes == 1) {
memset(np->ob_item, a->ob_item[0], newbytes);
} else {
Py_ssize_t done = oldbytes;
Py_MEMCPY(np->ob_item, a->ob_item, oldbytes);
while (done < newbytes) {
Py_ssize_t ncopy = (done <= newbytes-done) ? done : newbytes-done;
Py_MEMCPY(np->ob_item+done, np->ob_item, ncopy);
done += ncopy;
}
}
return (PyObject *)np;
}
static int
array_ass_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
{
char *item;
Py_ssize_t n; /* Size of replacement array */
Py_ssize_t d; /* Change in size */
#define b ((arrayobject *)v)
if (v == NULL)
n = 0;
else if (array_Check(v)) {
n = Py_SIZE(b);
if (a == b) {
/* Special case "a[i:j] = a" -- copy b first */
int ret;
v = array_slice(b, 0, n);
if (!v)
return -1;
ret = array_ass_slice(a, ilow, ihigh, v);
Py_DECREF(v);
return ret;
}
if (b->ob_descr != a->ob_descr) {
PyErr_BadArgument();
return -1;
}
}
else {
PyErr_Format(PyExc_TypeError,
"can only assign array (not \"%.200s\") to array slice",
Py_TYPE(v)->tp_name);
return -1;
}
if (ilow < 0)
ilow = 0;
else if (ilow > Py_SIZE(a))
ilow = Py_SIZE(a);
if (ihigh < 0)
ihigh = 0;
if (ihigh < ilow)
ihigh = ilow;
else if (ihigh > Py_SIZE(a))
ihigh = Py_SIZE(a);
item = a->ob_item;
d = n - (ihigh-ilow);
/* Issue #4509: If the array has exported buffers and the slice
assignment would change the size of the array, fail early to make
sure we don't modify it. */
if (d != 0 && a->ob_exports > 0) {
PyErr_SetString(PyExc_BufferError,
"cannot resize an array that is exporting buffers");
return -1;
}
if (d < 0) { /* Delete -d items */
memmove(item + (ihigh+d)*a->ob_descr->itemsize,
item + ihigh*a->ob_descr->itemsize,
(Py_SIZE(a)-ihigh)*a->ob_descr->itemsize);
if (array_resize(a, Py_SIZE(a) + d) == -1)
return -1;
}
else if (d > 0) { /* Insert d items */
if (array_resize(a, Py_SIZE(a) + d))
return -1;
memmove(item + (ihigh+d)*a->ob_descr->itemsize,
item + ihigh*a->ob_descr->itemsize,
(Py_SIZE(a)-ihigh)*a->ob_descr->itemsize);
}
if (n > 0)
memcpy(item + ilow*a->ob_descr->itemsize, b->ob_item,
n*b->ob_descr->itemsize);
return 0;
#undef b
}
static int
array_ass_item(arrayobject *a, Py_ssize_t i, PyObject *v)
{
if (i < 0 || i >= Py_SIZE(a)) {
PyErr_SetString(PyExc_IndexError,
"array assignment index out of range");
return -1;
}
if (v == NULL)
return array_ass_slice(a, i, i+1, v);
return (*a->ob_descr->setitem)(a, i, v);
}
static int
setarrayitem(PyObject *a, Py_ssize_t i, PyObject *v)
{
assert(array_Check(a));
return array_ass_item((arrayobject *)a, i, v);
}
static int
array_iter_extend(arrayobject *self, PyObject *bb)
{
PyObject *it, *v;
it = PyObject_GetIter(bb);
if (it == NULL)
return -1;
while ((v = PyIter_Next(it)) != NULL) {
if (ins1(self, Py_SIZE(self), v) != 0) {
Py_DECREF(v);
Py_DECREF(it);
return -1;
}
Py_DECREF(v);
}
Py_DECREF(it);
if (PyErr_Occurred())
return -1;
return 0;
}
static int
array_do_extend(arrayobject *self, PyObject *bb)
{
Py_ssize_t size, oldsize, bbsize;
if (!array_Check(bb))
return array_iter_extend(self, bb);
#define b ((arrayobject *)bb)
if (self->ob_descr != b->ob_descr) {
PyErr_SetString(PyExc_TypeError,
"can only extend with array of same kind");
return -1;
}
if ((Py_SIZE(self) > PY_SSIZE_T_MAX - Py_SIZE(b)) ||
((Py_SIZE(self) + Py_SIZE(b)) > PY_SSIZE_T_MAX / self->ob_descr->itemsize)) {
PyErr_NoMemory();
return -1;
}
oldsize = Py_SIZE(self);
/* Get the size of bb before resizing the array since bb could be self. */
bbsize = Py_SIZE(bb);
size = oldsize + Py_SIZE(b);
if (array_resize(self, size) == -1)
return -1;
memcpy(self->ob_item + oldsize * self->ob_descr->itemsize,
b->ob_item, bbsize * b->ob_descr->itemsize);
return 0;
#undef b
}
static PyObject *
array_inplace_concat(arrayobject *self, PyObject *bb)
{
if (!array_Check(bb)) {
PyErr_Format(PyExc_TypeError,
"can only extend array with array (not \"%.200s\")",