arraymodule.c 31.5 KB
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/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.
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                        All Rights Reserved

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Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
CNRI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.

While CWI is the initial source for this software, a modified version
is made available by the Corporation for National Research Initiatives
(CNRI) at the Internet address ftp://ftp.python.org.

STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
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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 */

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#include "Python.h"
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#ifdef STDC_HEADERS
#include <stddef.h>
#else
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#include <sys/types.h>		/* For size_t */
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#endif
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struct arrayobject; /* Forward */

struct arraydescr {
	int typecode;
	int itemsize;
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	PyObject * (*getitem) Py_FPROTO((struct arrayobject *, int));
	int (*setitem) Py_FPROTO((struct arrayobject *, int, PyObject *));
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};

typedef struct arrayobject {
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	PyObject_VAR_HEAD
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	char *ob_item;
	struct arraydescr *ob_descr;
} arrayobject;

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staticforward PyTypeObject Arraytype;
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#define is_arrayobject(op) ((op)->ob_type == &Arraytype)

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/* Forward */
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static PyObject *newarrayobject Py_PROTO((int, struct arraydescr *));
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#if 0
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static int getarraysize Py_PROTO((PyObject *));
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#endif
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static PyObject *getarrayitem Py_PROTO((PyObject *, int));
static int setarrayitem Py_PROTO((PyObject *, int, PyObject *));
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#if 0
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static int insarrayitem Py_PROTO((PyObject *, int, PyObject *));
static int addarrayitem Py_PROTO((PyObject *, PyObject *));
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#endif
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static PyObject *
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c_getitem(ap, i)
	arrayobject *ap;
	int i;
{
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	return PyString_FromStringAndSize(&((char *)ap->ob_item)[i], 1);
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}

static int
c_setitem(ap, i, v)
	arrayobject *ap;
	int i;
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	PyObject *v;
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{
	char x;
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	if (!PyArg_Parse(v, "c;array item must be char", &x))
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		return -1;
	if (i >= 0)
		     ((char *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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b_getitem(ap, i)
	arrayobject *ap;
	int i;
{
	long x = ((char *)ap->ob_item)[i];
	if (x >= 128)
		x -= 256;
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	return PyInt_FromLong(x);
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}

static int
b_setitem(ap, i, v)
	arrayobject *ap;
	int i;
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	PyObject *v;
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{
	char x;
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	if (!PyArg_Parse(v, "b;array item must be integer", &x))
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		return -1;
	if (i >= 0)
		     ((char *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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BB_getitem(ap, i)
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	arrayobject *ap;
	int i;
{
	long x = ((unsigned char *)ap->ob_item)[i];
	return PyInt_FromLong(x);
}

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#define BB_setitem b_setitem
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static PyObject *
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h_getitem(ap, i)
	arrayobject *ap;
	int i;
{
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	return PyInt_FromLong((long) ((short *)ap->ob_item)[i]);
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}

static int
h_setitem(ap, i, v)
	arrayobject *ap;
	int i;
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	PyObject *v;
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{
	short x;
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	if (!PyArg_Parse(v, "h;array item must be integer", &x))
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		return -1;
	if (i >= 0)
		     ((short *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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HH_getitem(ap, i)
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	arrayobject *ap;
	int i;
{
	return PyInt_FromLong((long) ((unsigned short *)ap->ob_item)[i]);
}

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#define HH_setitem h_setitem
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static PyObject *
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i_getitem(ap, i)
	arrayobject *ap;
	int i;
{
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	return PyInt_FromLong((long) ((int *)ap->ob_item)[i]);
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}

static int
i_setitem(ap, i, v)
	arrayobject *ap;
	int i;
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	PyObject *v;
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{
	int x;
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	if (!PyArg_Parse(v, "i;array item must be integer", &x))
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		return -1;
	if (i >= 0)
		     ((int *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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II_getitem(ap, i)
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	arrayobject *ap;
	int i;
{
	return PyLong_FromUnsignedLong(
		(unsigned long) ((unsigned int *)ap->ob_item)[i]);
}

static int
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II_setitem(ap, i, v)
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	arrayobject *ap;
	int i;
	PyObject *v;
{
	unsigned long x;
	if (PyLong_Check(v)) {
		x = PyLong_AsUnsignedLong(v);
		if (x == (unsigned long) -1 && PyErr_Occurred())
			return -1;
	}
	else {
		if (!PyArg_Parse(v, "l;array item must be integer", &x))
			return -1;
	}
	if (i >= 0)
		((unsigned int *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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l_getitem(ap, i)
	arrayobject *ap;
	int i;
{
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	return PyInt_FromLong(((long *)ap->ob_item)[i]);
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}

static int
l_setitem(ap, i, v)
	arrayobject *ap;
	int i;
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	PyObject *v;
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{
	long x;
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	if (!PyArg_Parse(v, "l;array item must be integer", &x))
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		return -1;
	if (i >= 0)
		     ((long *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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LL_getitem(ap, i)
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	arrayobject *ap;
	int i;
{
	return PyLong_FromUnsignedLong(((unsigned long *)ap->ob_item)[i]);
}

static int
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LL_setitem(ap, i, v)
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	arrayobject *ap;
	int i;
	PyObject *v;
{
	unsigned long x;
	if (PyLong_Check(v)) {
		x = PyLong_AsUnsignedLong(v);
		if (x == (unsigned long) -1 && PyErr_Occurred())
			return -1;
	}
	else {
		if (!PyArg_Parse(v, "l;array item must be integer", &x))
			return -1;
	}
	if (i >= 0)
		((unsigned long *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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f_getitem(ap, i)
	arrayobject *ap;
	int i;
{
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	return PyFloat_FromDouble((double) ((float *)ap->ob_item)[i]);
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}

static int
f_setitem(ap, i, v)
	arrayobject *ap;
	int i;
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	PyObject *v;
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{
	float x;
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	if (!PyArg_Parse(v, "f;array item must be float", &x))
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		return -1;
	if (i >= 0)
		     ((float *)ap->ob_item)[i] = x;
	return 0;
}

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static PyObject *
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d_getitem(ap, i)
	arrayobject *ap;
	int i;
{
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	return PyFloat_FromDouble(((double *)ap->ob_item)[i]);
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}

static int
d_setitem(ap, i, v)
	arrayobject *ap;
	int i;
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	PyObject *v;
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{
	double x;
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	if (!PyArg_Parse(v, "d;array item must be float", &x))
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		return -1;
	if (i >= 0)
		     ((double *)ap->ob_item)[i] = x;
	return 0;
}

/* Description of types */
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static struct arraydescr descriptors[] = {
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	{'c', sizeof(char), c_getitem, c_setitem},
	{'b', sizeof(char), b_getitem, b_setitem},
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	{'B', sizeof(char), BB_getitem, BB_setitem},
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	{'h', sizeof(short), h_getitem, h_setitem},
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	{'H', sizeof(short), HH_getitem, HH_setitem},
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	{'i', sizeof(int), i_getitem, i_setitem},
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	{'I', sizeof(int), II_getitem, II_setitem},
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	{'l', sizeof(long), l_getitem, l_setitem},
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	{'L', sizeof(long), LL_getitem, LL_setitem},
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	{'f', sizeof(float), f_getitem, f_setitem},
	{'d', sizeof(double), d_getitem, d_setitem},
	{'\0', 0, 0, 0} /* Sentinel */
};
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/* If we ever allow items larger than double, we must change reverse()! */
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static PyObject *
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newarrayobject(size, descr)
	int size;
	struct arraydescr *descr;
{
	arrayobject *op;
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	size_t nbytes;
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	if (size < 0) {
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		PyErr_BadInternalCall();
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		return NULL;
	}
	nbytes = size * descr->itemsize;
	/* Check for overflow */
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	if (nbytes / descr->itemsize != (size_t)size) {
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		return PyErr_NoMemory();
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	}
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	op = PyMem_NEW(arrayobject, 1);
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	if (op == NULL) {
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		return PyErr_NoMemory();
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	}
	if (size <= 0) {
		op->ob_item = NULL;
	}
	else {
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		op->ob_item = PyMem_NEW(char, nbytes);
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		if (op->ob_item == NULL) {
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			PyMem_DEL(op);
			return PyErr_NoMemory();
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		}
	}
	op->ob_type = &Arraytype;
	op->ob_size = size;
	op->ob_descr = descr;
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	_Py_NewReference(op);
	return (PyObject *) op;
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}

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#if 0
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static int
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getarraysize(op)
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	PyObject *op;
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{
	if (!is_arrayobject(op)) {
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		PyErr_BadInternalCall();
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		return -1;
	}
	return ((arrayobject *)op) -> ob_size;
}
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#endif
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static PyObject *
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getarrayitem(op, i)
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	PyObject *op;
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	int i;
{
	register arrayobject *ap;
	if (!is_arrayobject(op)) {
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		PyErr_BadInternalCall();
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		return NULL;
	}
	ap = (arrayobject *)op;
	if (i < 0 || i >= ap->ob_size) {
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		PyErr_SetString(PyExc_IndexError, "array index out of range");
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		return NULL;
	}
	return (*ap->ob_descr->getitem)(ap, i);
}

static int
ins1(self, where, v)
	arrayobject *self;
	int where;
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	PyObject *v;
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{
	char *items;
	if (v == NULL) {
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		PyErr_BadInternalCall();
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		return -1;
	}
	if ((*self->ob_descr->setitem)(self, -1, v) < 0)
		return -1;
	items = self->ob_item;
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	PyMem_RESIZE(items, char,
		     (self->ob_size+1) * self->ob_descr->itemsize);
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	if (items == NULL) {
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		PyErr_NoMemory();
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		return -1;
	}
	if (where < 0)
		where = 0;
	if (where > self->ob_size)
		where = self->ob_size;
	memmove(items + (where+1)*self->ob_descr->itemsize,
		items + where*self->ob_descr->itemsize,
		(self->ob_size-where)*self->ob_descr->itemsize);
	self->ob_item = items;
	self->ob_size++;
	return (*self->ob_descr->setitem)(self, where, v);
}

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#if 0
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static int
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insarrayitem(op, where, newitem)
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	PyObject *op;
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	int where;
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	PyObject *newitem;
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{
	if (!is_arrayobject(op)) {
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		PyErr_BadInternalCall();
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		return -1;
	}
	return ins1((arrayobject *)op, where, newitem);
}

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static int
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addarrayitem(op, newitem)
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	PyObject *op;
	PyObject *newitem;
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{
	if (!is_arrayobject(op)) {
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		PyErr_BadInternalCall();
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		return -1;
	}
	return ins1((arrayobject *)op,
		(int) ((arrayobject *)op)->ob_size, newitem);
}
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#endif
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/* Methods */

static void
array_dealloc(op)
	arrayobject *op;
{
	if (op->ob_item != NULL)
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		PyMem_DEL(op->ob_item);
	PyMem_DEL(op);
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}

static int
array_compare(v, w)
	arrayobject *v, *w;
{
	int len = (v->ob_size < w->ob_size) ? v->ob_size : w->ob_size;
	int i;
	for (i = 0; i < len; i++) {
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		PyObject *ai, *bi;
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		int cmp;
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		ai = getarrayitem((PyObject *)v, i);
		bi = getarrayitem((PyObject *)w, i);
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		if (ai && bi)
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			cmp = PyObject_Compare(ai, bi);
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		else
			cmp = -1;
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		Py_XDECREF(ai);
		Py_XDECREF(bi);
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		if (cmp != 0)
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			return cmp;
	}
	return v->ob_size - w->ob_size;
}

static int
array_length(a)
	arrayobject *a;
{
	return a->ob_size;
}

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static PyObject *
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array_item(a, i)
	arrayobject *a;
	int i;
{
	if (i < 0 || i >= a->ob_size) {
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		PyErr_SetString(PyExc_IndexError, "array index out of range");
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		return NULL;
	}
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	return getarrayitem((PyObject *)a, i);
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}

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static PyObject *
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array_slice(a, ilow, ihigh)
	arrayobject *a;
	int ilow, ihigh;
{
	arrayobject *np;
	if (ilow < 0)
		ilow = 0;
	else if (ilow > a->ob_size)
		ilow = a->ob_size;
	if (ihigh < 0)
		ihigh = 0;
	if (ihigh < ilow)
		ihigh = ilow;
	else if (ihigh > a->ob_size)
		ihigh = a->ob_size;
	np = (arrayobject *) newarrayobject(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);
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	return (PyObject *)np;
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}

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static PyObject *
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array_concat(a, bb)
	arrayobject *a;
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	PyObject *bb;
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{
	int size;
	arrayobject *np;
	if (!is_arrayobject(bb)) {
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		PyErr_BadArgument();
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		return NULL;
	}
#define b ((arrayobject *)bb)
	if (a->ob_descr != b->ob_descr) {
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		PyErr_BadArgument();
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		return NULL;
	}
	size = a->ob_size + b->ob_size;
	np = (arrayobject *) newarrayobject(size, a->ob_descr);
	if (np == NULL) {
		return NULL;
	}
	memcpy(np->ob_item, a->ob_item, a->ob_size*a->ob_descr->itemsize);
	memcpy(np->ob_item + a->ob_size*a->ob_descr->itemsize,
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	       b->ob_item, b->ob_size*b->ob_descr->itemsize);
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	return (PyObject *)np;
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#undef b
}

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static PyObject *
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array_repeat(a, n)
	arrayobject *a;
	int n;
{
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	int i;
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	int size;
	arrayobject *np;
	char *p;
	int nbytes;
	if (n < 0)
		n = 0;
	size = a->ob_size * n;
	np = (arrayobject *) newarrayobject(size, a->ob_descr);
	if (np == NULL)
		return NULL;
	p = np->ob_item;
	nbytes = a->ob_size * a->ob_descr->itemsize;
	for (i = 0; i < n; i++) {
		memcpy(p, a->ob_item, nbytes);
		p += nbytes;
	}
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	return (PyObject *) np;
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}

static int
array_ass_slice(a, ilow, ihigh, v)
	arrayobject *a;
	int ilow, ihigh;
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	PyObject *v;
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{
	char *item;
	int n; /* Size of replacement array */
	int d; /* Change in size */
#define b ((arrayobject *)v)
	if (v == NULL)
		n = 0;
	else if (is_arrayobject(v)) {
		n = b->ob_size;
		if (a == b) {
			/* Special case "a[i:j] = a" -- copy b first */
			int ret;
			v = array_slice(b, 0, n);
			ret = array_ass_slice(a, ilow, ihigh, v);
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			Py_DECREF(v);
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			return ret;
		}
		if (b->ob_descr != a->ob_descr) {
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			PyErr_BadArgument();
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			return -1;
		}
	}
	else {
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		PyErr_BadArgument();
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		return -1;
	}
	if (ilow < 0)
		ilow = 0;
	else if (ilow > a->ob_size)
		ilow = a->ob_size;
	if (ihigh < 0)
		ihigh = 0;
	if (ihigh < ilow)
		ihigh = ilow;
	else if (ihigh > a->ob_size)
		ihigh = a->ob_size;
	item = a->ob_item;
	d = n - (ihigh-ilow);
	if (d < 0) { /* Delete -d items */
		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
			item + ihigh*a->ob_descr->itemsize,
			(a->ob_size-ihigh)*a->ob_descr->itemsize);
		a->ob_size += d;
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		PyMem_RESIZE(item, char, a->ob_size*a->ob_descr->itemsize);
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						/* Can't fail */
		a->ob_item = item;
	}
	else if (d > 0) { /* Insert d items */
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		PyMem_RESIZE(item, char,
			     (a->ob_size + d)*a->ob_descr->itemsize);
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		if (item == NULL) {
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			PyErr_NoMemory();
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			return -1;
		}
		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
			item + ihigh*a->ob_descr->itemsize,
			(a->ob_size-ihigh)*a->ob_descr->itemsize);
		a->ob_item = item;
		a->ob_size += d;
	}
	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(a, i, v)
	arrayobject *a;
	int i;
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	PyObject *v;
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{
	if (i < 0 || i >= a->ob_size) {
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		PyErr_SetString(PyExc_IndexError,
			         "array assignment index out of range");
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		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(a, i, v)
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	PyObject *a;
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	int i;
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	PyObject *v;
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{
	if (!is_arrayobject(a)) {
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		PyErr_BadInternalCall();
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		return -1;
	}
	return array_ass_item((arrayobject *)a, i, v);
}

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static PyObject *
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ins(self, where, v)
	arrayobject *self;
	int where;
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	PyObject *v;
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{
	if (ins1(self, where, v) != 0)
		return NULL;
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	Py_INCREF(Py_None);
	return Py_None;
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}

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static PyObject *
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array_insert(self, args)
	arrayobject *self;
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	PyObject *args;
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{
	int i;
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	PyObject *v;
	if (!PyArg_Parse(args, "(iO)", &i, &v))
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		return NULL;
	return ins(self, i, v);
}

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static char insert_doc [] =
"insert (i,x)\n\
\n\
Insert a new item x into the array before position i.";


720 721 722 723 724 725 726 727 728
static PyObject *
array_buffer_info(self, args)
	arrayobject *self;
	PyObject *args;
{
	return Py_BuildValue("ll",
			     (long)(self->ob_item), (long)(self->ob_size));
}

729 730 731 732 733 734 735
static char buffer_info_doc [] =
"buffer_info -> (address, length)\n\
\n\
Return a tuple (address, length) giving the current memory address and\n\
the length in bytes of the buffer used to hold array's contents.";


736
static PyObject *
737 738
array_append(self, args)
	arrayobject *self;
739
	PyObject *args;
740
{
741 742
	PyObject *v;
	if (!PyArg_Parse(args, "O", &v))
743 744 745 746
		return NULL;
	return ins(self, (int) self->ob_size, v);
}

747 748 749 750 751 752
static char append_doc [] =
"append(x)\n\
\n\
Append new value x to the end of the array.";


753
static PyObject *
754 755
array_byteswap(self, args)
	arrayobject *self;
756
	PyObject *args;
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
{
	char *p;
	int i;
	switch (self->ob_descr->itemsize) {
	case 1:
		break;
	case 2:
		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 2) {
			char p0 = p[0];
			p[0] = p[1];
			p[1] = p0;
		}
		break;
	case 4:
		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 4) {
			char p0 = p[0];
			char p1 = p[1];
			p[0] = p[3];
			p[1] = p[2];
			p[2] = p1;
			p[3] = p0;
		}
		break;
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
	case 8:
		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 8) {
			char p0 = p[0];
			char p1 = p[1];
			char p2 = p[2];
			char p3 = p[3];
			p[0] = p[7];
			p[1] = p[6];
			p[2] = p[5];
			p[3] = p[4];
			p[4] = p3;
			p[5] = p2;
			p[6] = p1;
			p[7] = p0;
		}
		break;
796
	default:
797
		PyErr_SetString(PyExc_RuntimeError,
798 799 800
			   "don't know how to byteswap this array type");
		return NULL;
	}
801 802
	Py_INCREF(Py_None);
	return Py_None;
803 804
}

805 806 807 808 809 810
static char byteswap_doc [] =
"byteswap(x)\n\
\n\
Byteswap all items of the array.  This is only supported for integer\n\
values of x, which determines the size of the blocks swapped.";

811
static PyObject *
812 813
array_reverse(self, args)
	arrayobject *self;
814
	PyObject *args;
815
{
816 817 818 819
	register int itemsize = self->ob_descr->itemsize;
	register char *p, *q;
	char tmp[sizeof(double)]; /* Assume that's the max item size */

820
	if (args != NULL) {
821
		PyErr_BadArgument();
822 823 824 825
		return NULL;
	}

	if (self->ob_size > 1) {
826 827 828 829 830 831 832
		for (p = self->ob_item,
		     q = self->ob_item + (self->ob_size - 1)*itemsize;
		     p < q;
		     p += itemsize, q -= itemsize) {
			memmove(tmp, p, itemsize);
			memmove(p, q, itemsize);
			memmove(q, tmp, itemsize);
833 834 835
		}
	}
	
836 837
	Py_INCREF(Py_None);
	return Py_None;
838
}
839

840 841 842 843 844
static char reverse_doc [] =
"reverse()\n\
\n\
Reverse the order of the items in the array.";

845 846
/* The following routines were adapted from listobject.c but not converted.
   To make them work you will have to work! */
847 848

#if 0
849
static PyObject *
850 851
array_index(self, args)
	arrayobject *self;
852
	PyObject *args;
853 854 855 856
{
	int i;
	
	if (args == NULL) {
857
		PyErr_BadArgument();
858 859 860
		return NULL;
	}
	for (i = 0; i < self->ob_size; i++) {
861 862
		if (PyObject_Compare(self->ob_item[i], args) == 0)
			return PyInt_FromLong((long)i);
863
		/* XXX PyErr_Occurred */
864
	}
865
	PyErr_SetString(PyExc_ValueError, "array.index(x): x not in array");
866 867 868 869 870
	return NULL;
}
#endif

#if 0
871
static PyObject *
872 873
array_count(self, args)
	arrayobject *self;
874
	PyObject *args;
875 876 877 878 879
{
	int count = 0;
	int i;
	
	if (args == NULL) {
880
		PyErr_BadArgument();
881 882 883
		return NULL;
	}
	for (i = 0; i < self->ob_size; i++) {
884
		if (PyObject_Compare(self->ob_item[i], args) == 0)
885
			count++;
886
		/* XXX PyErr_Occurred */
887
	}
888
	return PyInt_FromLong((long)count);
889 890 891 892
}
#endif

#if 0
893
static PyObject *
894 895
array_remove(self, args)
	arrayobject *self;
896
	PyObject *args;
897 898 899 900
{
	int i;
	
	if (args == NULL) {
901
		PyErr_BadArgument();
902 903 904
		return NULL;
	}
	for (i = 0; i < self->ob_size; i++) {
905
		if (PyObject_Compare(self->ob_item[i], args) == 0) {
906 907
			if (array_ass_slice(self, i, i+1,
					    (PyObject *)NULL) != 0)
908
				return NULL;
909 910
			Py_INCREF(Py_None);
			return Py_None;
911
		}
912
		/* XXX PyErr_Occurred */
913
	}
914
	PyErr_SetString(PyExc_ValueError, "array.remove(x): x not in array");
915 916 917 918
	return NULL;
}
#endif

919
static PyObject *
920
array_fromfile(self, args)
921
	arrayobject *self;
922
	PyObject *args;
923
{
924
	PyObject *f;
925 926
	int n;
	FILE *fp;
927
	if (!PyArg_Parse(args, "(Oi)", &f, &n))
928
		return NULL;
929
	fp = PyFile_AsFile(f);
930
	if (fp == NULL) {
931
		PyErr_SetString(PyExc_TypeError, "arg1 must be open file");
932 933 934 935 936 937
		return NULL;
	}
	if (n > 0) {
		char *item = self->ob_item;
		int itemsize = self->ob_descr->itemsize;
		int nread;
938 939 940 941
		int newlength;
		size_t newbytes;
		/* Be careful here about overflow */
		if ((newlength = self->ob_size + n) <= 0 ||
942 943
		    (newbytes = newlength * itemsize) / itemsize !=
		    (size_t)newlength)
944 945
			goto nomem;
		PyMem_RESIZE(item, char, newbytes);
946
		if (item == NULL) {
947
		  nomem:
948
			PyErr_NoMemory();
949 950 951 952 953 954 955 956
			return NULL;
		}
		self->ob_item = item;
		self->ob_size += n;
		nread = fread(item + (self->ob_size - n) * itemsize,
			      itemsize, n, fp);
		if (nread < n) {
			self->ob_size -= (n - nread);
957
			PyMem_RESIZE(item, char, self->ob_size*itemsize);
958
			self->ob_item = item;
959 960
			PyErr_SetString(PyExc_EOFError,
				         "not enough items in file");
961 962 963
			return NULL;
		}
	}
964 965
	Py_INCREF(Py_None);
	return Py_None;
966 967
}

968 969 970 971 972 973 974
static char fromfile_doc [] =
"fromfile(f, n)\n\
\n\
Read n objects from the file object f and append them to the end of the\n\
array.  Also called as read.";


975
static PyObject *
976
array_tofile(self, args)
977
	arrayobject *self;
978
	PyObject *args;
979
{
980
	PyObject *f;
981
	FILE *fp;
982
	if (!PyArg_Parse(args, "O", &f))
983
		return NULL;
984
	fp = PyFile_AsFile(f);
985
	if (fp == NULL) {
986
		PyErr_SetString(PyExc_TypeError, "arg must be open file");
987 988 989
		return NULL;
	}
	if (self->ob_size > 0) {
990
		if ((int)fwrite(self->ob_item, self->ob_descr->itemsize,
991
			   self->ob_size, fp) != self->ob_size) {
992
			PyErr_SetFromErrno(PyExc_IOError);
993 994 995 996
			clearerr(fp);
			return NULL;
		}
	}
997 998
	Py_INCREF(Py_None);
	return Py_None;
999 1000
}

1001 1002 1003 1004 1005 1006 1007
static char tofile_doc [] =
"tofile(f)\n\
\n\
Write all items (as machine values) to the file object f.  Also called as\n\
write.";


1008
static PyObject *
1009 1010
array_fromlist(self, args)
	arrayobject *self;
1011
	PyObject *args;
1012 1013
{
	int n;
1014
	PyObject *list;
1015
	int itemsize = self->ob_descr->itemsize;
1016
	if (!PyArg_Parse(args, "O", &list))
1017
		return NULL;
1018 1019
	if (!PyList_Check(list)) {
		PyErr_SetString(PyExc_TypeError, "arg must be list");
1020 1021
		return NULL;
	}
1022
	n = PyList_Size(list);
1023 1024 1025
	if (n > 0) {
		char *item = self->ob_item;
		int i;
1026
		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
1027
		if (item == NULL) {
1028
			PyErr_NoMemory();
1029 1030 1031 1032 1033
			return NULL;
		}
		self->ob_item = item;
		self->ob_size += n;
		for (i = 0; i < n; i++) {
1034
			PyObject *v = PyList_GetItem(list, i);
1035 1036 1037
			if ((*self->ob_descr->setitem)(self,
					self->ob_size - n + i, v) != 0) {
				self->ob_size -= n;
1038 1039
				PyMem_RESIZE(item, char,
					          self->ob_size * itemsize);
1040 1041 1042 1043 1044
				self->ob_item = item;
				return NULL;
			}
		}
	}
1045 1046
	Py_INCREF(Py_None);
	return Py_None;
1047 1048
}

1049 1050 1051 1052 1053 1054
static char fromlist_doc [] =
"fromlist(list)\n\
\n\
Append items to array from list.";


1055
static PyObject *
1056 1057
array_tolist(self, args)
	arrayobject *self;
1058
	PyObject *args;
1059
{
1060
	PyObject *list = PyList_New(self->ob_size);
1061 1062 1063 1064
	int i;
	if (list == NULL)
		return NULL;
	for (i = 0; i < self->ob_size; i++) {
1065
		PyObject *v = getarrayitem((PyObject *)self, i);
1066
		if (v == NULL) {
1067
			Py_DECREF(list);
1068 1069
			return NULL;
		}
1070
		PyList_SetItem(list, i, v);
1071 1072 1073 1074
	}
	return list;
}

1075
static char tolist_doc [] =
1076
"tolist() -> list\n\
1077 1078 1079 1080
\n\
Convert array to an ordinary list with the same items.";


1081
static PyObject *
1082 1083
array_fromstring(self, args)
	arrayobject *self;
1084
	PyObject *args;
1085 1086 1087 1088
{
	char *str;
	int n;
	int itemsize = self->ob_descr->itemsize;
1089
	if (!PyArg_Parse(args, "s#", &str, &n))
1090 1091
		return NULL;
	if (n % itemsize != 0) {
1092
		PyErr_SetString(PyExc_ValueError,
1093 1094 1095 1096 1097 1098
			   "string length not a multiple of item size");
		return NULL;
	}
	n = n / itemsize;
	if (n > 0) {
		char *item = self->ob_item;
1099
		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
1100
		if (item == NULL) {
1101
			PyErr_NoMemory();
1102 1103 1104 1105
			return NULL;
		}
		self->ob_item = item;
		self->ob_size += n;
1106 1107
		memcpy(item + (self->ob_size - n) * itemsize,
		       str, itemsize*n);
1108
	}
1109 1110
	Py_INCREF(Py_None);
	return Py_None;
1111 1112
}

1113 1114 1115 1116 1117 1118 1119
static char fromstring_doc [] =
"fromstring(string)\n\
\n\
Appends items from the string, interpreting it as an array of machine\n\
values,as if it had been read from a file using the fromfile() method).";


1120
static PyObject *
1121 1122
array_tostring(self, args)
	arrayobject *self;
1123
	PyObject *args;
1124
{
1125
	if (!PyArg_Parse(args, ""))
1126
		return NULL;
1127
	return PyString_FromStringAndSize(self->ob_item,
1128 1129 1130
				    self->ob_size * self->ob_descr->itemsize);
}

1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
static char tostring_doc [] =
"tostring() -> string\n\
\n\
Convert the array to an array of machine values and return the string\n\
representation.";

PyMethodDef array_methods[] = {
	{"append",	(PyCFunction)array_append, 0, append_doc},
	{"buffer_info", (PyCFunction)array_buffer_info, 0, buffer_info_doc},
	{"byteswap",	(PyCFunction)array_byteswap, 0, byteswap_doc},
1141
/*	{"count",	(method)array_count},*/
1142 1143 1144
	{"fromfile",	(PyCFunction)array_fromfile, 0, fromfile_doc},
	{"fromlist",	(PyCFunction)array_fromlist, 0, fromlist_doc},
	{"fromstring",	(PyCFunction)array_fromstring, 0, fromstring_doc},
1145
/*	{"index",	(method)array_index},*/
1146 1147
	{"insert",	(PyCFunction)array_insert, 0, insert_doc},
	{"read",	(PyCFunction)array_fromfile, 0, fromfile_doc},
1148
/*	{"remove",	(method)array_remove},*/
1149
	{"reverse",	(PyCFunction)array_reverse, 0, reverse_doc},
1150
/*	{"sort",	(method)array_sort},*/
1151 1152 1153 1154
	{"tofile",	(PyCFunction)array_tofile, 0, tofile_doc},
	{"tolist",	(PyCFunction)array_tolist, 0, tolist_doc},
	{"tostring",	(PyCFunction)array_tostring, 0, tostring_doc},
	{"write",	(PyCFunction)array_tofile, 0, tofile_doc},
1155 1156 1157
	{NULL,		NULL}		/* sentinel */
};

1158
static PyObject *
1159 1160 1161 1162 1163 1164
array_getattr(a, name)
	arrayobject *a;
	char *name;
{
	if (strcmp(name, "typecode") == 0) {
		char tc = a->ob_descr->typecode;
1165
		return PyString_FromStringAndSize(&tc, 1);
1166 1167
	}
	if (strcmp(name, "itemsize") == 0) {
1168
		return PyInt_FromLong((long)a->ob_descr->itemsize);
1169
	}
1170
	if (strcmp(name, "__members__") == 0) {
1171
		PyObject *list = PyList_New(2);
1172
		if (list) {
1173 1174 1175 1176
			PyList_SetItem(list, 0,
				       PyString_FromString("typecode"));
			PyList_SetItem(list, 1,
				       PyString_FromString("itemsize"));
1177 1178
			if (PyErr_Occurred()) {
				Py_DECREF(list);
1179 1180 1181 1182 1183
				list = NULL;
			}
		}
		return list;
	}
1184
	return Py_FindMethod(array_methods, (PyObject *)a, name);
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
}

static int
array_print(a, fp, flags)
	arrayobject *a;
	FILE *fp;
	int flags;
{
	int ok = 0;
	int i, len;
1195
	PyObject *v;
1196 1197 1198 1199 1200 1201 1202
	len = a->ob_size;
	if (len == 0) {
		fprintf(fp, "array('%c')", a->ob_descr->typecode);
		return ok;
	}
	if (a->ob_descr->typecode == 'c') {
		fprintf(fp, "array('c', ");
1203 1204 1205
		v = array_tostring(a, (PyObject *)NULL);
		ok = PyObject_Print(v, fp, 0);
		Py_XDECREF(v);
1206 1207 1208 1209 1210 1211 1212 1213
		fprintf(fp, ")");
		return ok;
	}
	fprintf(fp, "array('%c', [", a->ob_descr->typecode);
	for (i = 0; i < len && ok == 0; i++) {
		if (i > 0)
			fprintf(fp, ", ");
		v = (a->ob_descr->getitem)(a, i);
1214 1215
		ok = PyObject_Print(v, fp, 0);
		Py_XDECREF(v);
1216 1217 1218 1219 1220
	}
	fprintf(fp, "])");
	return ok;
}

1221
static PyObject *
1222 1223 1224 1225
array_repr(a)
	arrayobject *a;
{
	char buf[256];
1226
	PyObject *s, *t, *comma, *v;
1227 1228 1229 1230
	int i, len;
	len = a->ob_size;
	if (len == 0) {
		sprintf(buf, "array('%c')", a->ob_descr->typecode);
1231
		return PyString_FromString(buf);
1232 1233 1234
	}
	if (a->ob_descr->typecode == 'c') {
		sprintf(buf, "array('c', ");
1235 1236 1237 1238 1239 1240
		s = PyString_FromString(buf);
		v = array_tostring(a, (PyObject *)NULL);
		t = PyObject_Repr(v);
		Py_XDECREF(v);
		PyString_ConcatAndDel(&s, t);
		PyString_ConcatAndDel(&s, PyString_FromString(")"));
1241 1242 1243
		return s;
	}
	sprintf(buf, "array('%c', [", a->ob_descr->typecode);
1244 1245 1246
	s = PyString_FromString(buf);
	comma = PyString_FromString(", ");
	for (i = 0; i < len && !PyErr_Occurred(); i++) {
1247
		if (i > 0)
1248
			PyString_Concat(&s, comma);
1249
		v = (a->ob_descr->getitem)(a, i);
1250 1251 1252
		t = PyObject_Repr(v);
		Py_XDECREF(v);
		PyString_ConcatAndDel(&s, t);
1253
	}
1254 1255
	Py_XDECREF(comma);
	PyString_ConcatAndDel(&s, PyString_FromString("])"));
1256 1257 1258
	return s;
}

1259 1260 1261 1262 1263 1264 1265
static int
array_buffer_getreadbuf(self, index, ptr)
	arrayobject *self;
	int index;
	const void **ptr;
{
	if ( index != 0 ) {
1266 1267
		PyErr_SetString(PyExc_SystemError,
				"Accessing non-existent array segment");
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
		return -1;
	}
	*ptr = (void *)self->ob_item;
	return self->ob_size*self->ob_descr->itemsize;
}

static int
array_buffer_getwritebuf(self, index, ptr)
	arrayobject *self;
	int index;
	const void **ptr;
{
	if ( index != 0 ) {
1281 1282
		PyErr_SetString(PyExc_SystemError,
				"Accessing non-existent array segment");
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
		return -1;
	}
	*ptr = (void *)self->ob_item;
	return self->ob_size*self->ob_descr->itemsize;
}

static int
array_buffer_getsegcount(self, lenp)
	arrayobject *self;
	int *lenp;
{
	if ( lenp )
		*lenp = self->ob_size*self->ob_descr->itemsize;
	return 1;
}

1299
static PySequenceMethods array_as_sequence = {
1300 1301
	(inquiry)array_length,		        /*sq_length*/
	(binaryfunc)array_concat,               /*sq_concat*/
1302
	(intargfunc)array_repeat,		/*sq_repeat*/
1303
	(intargfunc)array_item,		        /*sq_item*/
1304 1305 1306
	(intintargfunc)array_slice,		/*sq_slice*/
	(intobjargproc)array_ass_item,		/*sq_ass_item*/
	(intintobjargproc)array_ass_slice,	/*sq_ass_slice*/
1307 1308
};

1309 1310 1311 1312 1313 1314 1315
static PyBufferProcs array_as_buffer = {
	(getreadbufferproc)array_buffer_getreadbuf,
	(getwritebufferproc)array_buffer_getwritebuf,
	(getsegcountproc)array_buffer_getsegcount,
};


1316 1317


1318
static PyObject *
1319
a_array(self, args)
1320 1321
	PyObject *self;
	PyObject *args;
1322 1323
{
	char c;
1324
	PyObject *initial = NULL;
1325
	struct arraydescr *descr;
1326 1327 1328
	if (!PyArg_Parse(args, "c", &c)) {
		PyErr_Clear();
		if (!PyArg_Parse(args, "(cO)", &c, &initial))
1329
			return NULL;
1330 1331
		if (!PyList_Check(initial) && !PyString_Check(initial)) {
			PyErr_SetString(PyExc_TypeError,
1332
				 "array initializer must be list or string");
1333 1334 1335 1336 1337
			return NULL;
		}
	}
	for (descr = descriptors; descr->typecode != '\0'; descr++) {
		if (descr->typecode == c) {
1338
			PyObject *a;
1339
			int len;
1340
			if (initial == NULL || !PyList_Check(initial))
1341 1342
				len = 0;
			else
1343
				len = PyList_Size(initial);
1344 1345 1346 1347 1348 1349
			a = newarrayobject(len, descr);
			if (a == NULL)
				return NULL;
			if (len > 0) {
				int i;
				for (i = 0; i < len; i++) {
1350 1351
					PyObject *v =
					         PyList_GetItem(initial, i);
1352
					if (setarrayitem(a, i, v) != 0) {
1353
						Py_DECREF(a);
1354 1355 1356 1357
						return NULL;
					}
				}
			}
1358 1359
			if (initial != NULL && PyString_Check(initial)) {
				PyObject *v =
1360 1361
				  array_fromstring((arrayobject *)a, initial);
				if (v == NULL) {
1362
					Py_DECREF(a);
1363 1364
					return NULL;
				}
1365
				Py_DECREF(v);
1366 1367 1368 1369
			}
			return a;
		}
	}
1370
	PyErr_SetString(PyExc_ValueError,
1371
		"bad typecode (must be c, b, B, h, H, i, I, l, L, f or d)");
1372 1373 1374
	return NULL;
}

1375 1376 1377 1378 1379 1380 1381
static char a_array_doc [] =
"array(typecode [, initializer]) -> array\n\
\n\
Return a new array whose items are restricted by typecode, and\n\
initialized from the optional initializer value, which must be a list\n\
or a string.";

1382
static PyMethodDef a_methods[] = {
1383
	{"array",	a_array, 0, a_array_doc},
1384 1385 1386
	{NULL,		NULL}		/* sentinel */
};

1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
static char module_doc [] =
"This module defines a new object type which can efficiently represent\n\
an array of basic values: characters, integers, floating point\n\
numbers.  Arrays are sequence types and behave very much like lists,\n\
except that the type of objects stored in them is constrained.  The\n\
type is specified at object creation time by using a type code, which\n\
is a single character.  The following type codes are defined:\n\
\n\
    Type code   C Type             Minimum size in bytes \n\
    'c'         character          1 \n\
    'b'         signed integer     1 \n\
    'B'         unsigned integer   1 \n\
    'h'         signed integer     2 \n\
    'H'         unsigned integer   2 \n\
    'i'         signed integer     2 \n\
    'I'         unsigned integer   2 \n\
    'l'         signed integer     4 \n\
    'L'         unsigned integer   4 \n\
    'f'         floating point     4 \n\
    'd'         floating point     8 \n\
\n\
Functions:\n\
\n\
array(typecode [, initializer]) -- create a new array\n\
\n\
Special Objects:\n\
\n\
ArrayType -- type object for array objects\n\
";

static char arraytype_doc [] =
"An array represents basic values and behave very much like lists, except\n\
the type of objects stored in them is constrained.\n\
\n\
Methods:\n\
\n\
append() -- append a new item to the end of the array\n\
buffer_info() -- return information giving the current memory info\n\
byteswap() -- byteswap all the items of the array\n\
fromfile() -- read items from a file object\n\
fromlist() -- append items from the list\n\
fromstring() -- append items from the string\n\
insert() -- insert a new item into the array at a provided position\n\
read() -- DEPRECATED, use fromfile()\n\
reverse() -- reverse the order of the items in the array\n\
tofile() -- write all items to a file object\n\
tolist() -- return the array converted to an ordinary list\n\
tostring() -- return the array converted to a string\n\
write() -- DEPRECATED, use tofile()\n\
\n\
Variables:\n\
\n\
typecode -- the typecode character used to create the array\n\
itemsize -- the length in bytes of one array item\n\
";

statichere PyTypeObject Arraytype = {
	PyObject_HEAD_INIT(&PyType_Type)
	0,
	"array",
	sizeof(arrayobject),
	0,
	(destructor)array_dealloc,	/*tp_dealloc*/
	(printfunc)array_print,		/*tp_print*/
	(getattrfunc)array_getattr,	/*tp_getattr*/
	0,				/*tp_setattr*/
	(cmpfunc)array_compare,		/*tp_compare*/
	(reprfunc)array_repr,		/*tp_repr*/
	0,				/*tp_as_number*/
	&array_as_sequence,		/*tp_as_sequence*/
	0,				/*tp_as_mapping*/
	0, 				/*tp_hash*/
	0,				/*tp_call*/
	0,				/*tp_str*/
	0,				/*tp_getattro*/
	0,				/*tp_setattro*/
	&array_as_buffer,		/*tp_as_buffer*/
	0,				/*tp_xxx4*/
	arraytype_doc,			/*tp_doc*/
};

1468
DL_EXPORT(void)
1469 1470
initarray()
{
1471
	PyObject *m, *d;
1472
	m = Py_InitModule3("array", a_methods, module_doc);
1473
	d = PyModule_GetDict(m);
1474 1475
	PyDict_SetItemString(d, "ArrayType", (PyObject *)&Arraytype);
	/* No need to check the error here, the caller will do that */
1476
}