/***********************************************************

Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The

Netherlands.

All Rights Reserved

Permission to use, copy, modify, and distribute this software and its

documentation for any purpose and without fee is hereby granted,

provided that the above copyright notice appear in all copies and that

both that copyright notice and this permission notice appear in

supporting documentation, and that the names of Stichting Mathematisch

Centrum or CWI not be used in advertising or publicity pertaining to

distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO

THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM 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.

******************************************************************/

/* Integer object implementation */

#include "allobjects.h"

/* Standard Booleans */

intobject FalseObject = {

OB_HEAD_INIT(&Inttype)

0

};

intobject TrueObject = {

OB_HEAD_INIT(&Inttype)

1

};

static object *

err_ovf(msg)

char *msg;

{

err_setstr(OverflowError, msg);

return NULL;

}

/* Integers are quite normal objects, to make object handling uniform.

(Using odd pointers to represent integers would save much space

but require extra checks for this special case throughout the code.)

Since, a typical Python program spends much of its time allocating

and deallocating integers, these operations should be very fast.

Therefore we use a dedicated allocation scheme with a much lower

overhead (in space and time) than straight malloc(): a simple

dedicated free list, filled when necessary with memory from malloc().

*/

#define BLOCK_SIZE 1000 /* 1K less typical malloc overhead */

#define N_INTOBJECTS (BLOCK_SIZE / sizeof(intobject))

static intobject *

fill_free_list()

{

intobject *p, *q;

p = NEW(intobject, N_INTOBJECTS);

if (p == NULL)

return (intobject *)err_nomem();

q = p + N_INTOBJECTS;

while (--q > p)

*(intobject **)q = q-1;

*(intobject **)q = NULL;

return p + N_INTOBJECTS - 1;

}

static intobject *free_list = NULL;

object *

newintobject(ival)

long ival;

{

register intobject *v;

if (free_list == NULL) {

if ((free_list = fill_free_list()) == NULL)

return NULL;

}

v = free_list;

free_list = *(intobject **)free_list;

NEWREF(v);

v->ob_type = &Inttype;

v->ob_ival = ival;

return (object *) v;

}

static void

int_dealloc(v)

intobject *v;

{

*(intobject **)v = free_list;

free_list = v;

}

long

getintvalue(op)

register object *op;

{

if (!is_intobject(op)) {

err_badcall();

return -1;

}

else

return ((intobject *)op) -> ob_ival;

}

/* Methods */

/* ARGSUSED */

static int

int_print(v, fp, flags)

intobject *v;

FILE *fp;

int flags; /* Not used but required by interface */

{

fprintf(fp, "%ld", v->ob_ival);

return 0;

}

static object *

int_repr(v)

intobject *v;

{

char buf[20];

sprintf(buf, "%ld", v->ob_ival);

return newstringobject(buf);

}

static int

int_compare(v, w)

intobject *v, *w;

{

register long i = v->ob_ival;

register long j = w->ob_ival;

return (i < j) ? -1 : (i > j) ? 1 : 0;

}

static object *

int_add(v, w)

intobject *v;

intobject *w;

{

register long a, b, x;

a = v->ob_ival;

b = w->ob_ival;

x = a + b;

if ((x^a) < 0 && (x^b) < 0)

return err_ovf("integer addition");

return newintobject(x);

}

static object *

int_sub(v, w)

intobject *v;

intobject *w;

{

register long a, b, x;

a = v->ob_ival;

b = w->ob_ival;

x = a - b;

if ((x^a) < 0 && (x^~b) < 0)

return err_ovf("integer subtraction");

return newintobject(x);

}

static object *

int_mul(v, w)

intobject *v;

intobject *w;

{

register long a, b;

double x;

a = v->ob_ival;

b = w->ob_ival;

x = (double)a * (double)b;

if (x > 0x7fffffff || x < (double) (long) 0x80000000)

return err_ovf("integer multiplication");

return newintobject(a * b);

}

static int

i_divmod(x, y, p_xdivy, p_xmody)

register intobject *x, *y;

long *p_xdivy, *p_xmody;

{

long xi = x->ob_ival;

long yi = y->ob_ival;

long xdivy, xmody;

if (yi == 0) {

err_setstr(ZeroDivisionError, "integer division or modulo");

return -1;

}

if (yi < 0) {

if (xi < 0)

xdivy = -xi / -yi;

else

xdivy = - (xi / -yi);

}

else {

if (xi < 0)

xdivy = - (-xi / yi);

else

xdivy = xi / yi;

}

xmody = xi - xdivy*yi;

if (xmody < 0 && yi > 0 || xmody > 0 && yi < 0) {

xmody += yi;

xdivy -= 1;

}

*p_xdivy = xdivy;

*p_xmody = xmody;

return 0;

}

static object *

int_div(x, y)

intobject *x;

intobject *y;

{

long d, m;

if (i_divmod(x, y, &d, &m) < 0)

return NULL;

return newintobject(d);

}

static object *

int_mod(x, y)

intobject *x;

intobject *y;

{

long d, m;

if (i_divmod(x, y, &d, &m) < 0)

return NULL;

return newintobject(m);

}

static object *

int_divmod(x, y)

intobject *x;

intobject *y;

{

object *v, *v0, *v1;

long d, m;

if (i_divmod(x, y, &d, &m) < 0)

return NULL;

v = newtupleobject(2);

v0 = newintobject(d);

v1 = newintobject(m);

if (v == NULL || v0 == NULL || v1 == NULL ||

settupleitem(v, 0, v0) != 0 ||

settupleitem(v, 1, v1) != 0) {

XDECREF(v);

XDECREF(v0);

XDECREF(v1);

v = NULL;

}

return v;

}

static object *

int_pow(v, w)

intobject *v;

intobject *w;

{

register long iv, iw, ix;

iv = v->ob_ival;

iw = w->ob_ival;

if (iw < 0) {

err_setstr(ValueError, "integer to the negative power");

return NULL;

}

ix = 1;

while (--iw >= 0) {

long prev = ix;

ix = ix * iv;

if (iv == 0)

break; /* 0 to some power -- avoid ix / 0 */

if (ix / iv != prev)

return err_ovf("integer pow()");

}

return newintobject(ix);

}

static object *

int_neg(v)

intobject *v;

{

register long a, x;

a = v->ob_ival;

x = -a;

if (a < 0 && x < 0)

return err_ovf("integer negation");

return newintobject(x);

}

static object *

int_pos(v)

intobject *v;

{

INCREF(v);

return (object *)v;

}

static object *

int_abs(v)

intobject *v;

{

if (v->ob_ival >= 0)

return int_pos(v);

else

return int_neg(v);

}

static int

int_nonzero(v)

intobject *v;

{

return v->ob_ival != 0;

}

static object *

int_invert(v)

intobject *v;

{

return newintobject(~v->ob_ival);

}

static object *

int_lshift(v, w)

intobject *v;

intobject *w;

{

register long a, b;

a = v->ob_ival;

b = w->ob_ival;

if (b < 0) {

err_setstr(ValueError, "negative shift count");

return NULL;

}

if (a == 0 || b == 0) {

INCREF(v);

return (object *) v;

}

if (b >= 32) {

return newintobject(0L);

}

a = (unsigned long)a << b;

return newintobject(a);

}

static object *

int_rshift(v, w)

intobject *v;

intobject *w;

{

register long a, b;

a = v->ob_ival;

b = w->ob_ival;

if (b < 0) {

err_setstr(ValueError, "negative shift count");

return NULL;

}

if (a == 0 || b == 0) {

INCREF(v);

return (object *) v;

}

if (b >= 32) {

if (a < 0)

a = -1;

else

a = 0;

}

else {

if (a < 0)

a = ~( ~(unsigned long)a >> b );

else

a = (unsigned long)a >> b;

}

return newintobject(a);

}

static object *

int_and(v, w)

intobject *v;

intobject *w;

{

register long a, b;

a = v->ob_ival;

b = w->ob_ival;

return newintobject(a & b);

}

static object *

int_xor(v, w)

intobject *v;

intobject *w;

{

register long a, b;

a = v->ob_ival;

b = w->ob_ival;

return newintobject(a ^ b);

}

static object *

int_or(v, w)

intobject *v;

intobject *w;

{

register long a, b;

a = v->ob_ival;

b = w->ob_ival;

return newintobject(a | b);

}

static number_methods int_as_number = {

int_add, /*nb_add*/

int_sub, /*nb_subtract*/

int_mul, /*nb_multiply*/

int_div, /*nb_divide*/

int_mod, /*nb_remainder*/

int_divmod, /*nb_divmod*/

int_pow, /*nb_power*/

int_neg, /*nb_negative*/

int_pos, /*nb_positive*/

int_abs, /*nb_absolute*/

int_nonzero, /*nb_nonzero*/

int_invert, /*nb_invert*/

int_lshift, /*nb_lshift*/

int_rshift, /*nb_rshift*/

int_and, /*nb_and*/

int_xor, /*nb_xor*/

int_or, /*nb_or*/

};

typeobject Inttype = {

OB_HEAD_INIT(&Typetype)

0,

"int",

sizeof(intobject),

0,

int_dealloc, /*tp_dealloc*/

int_print, /*tp_print*/

0, /*tp_getattr*/

0, /*tp_setattr*/

int_compare, /*tp_compare*/

int_repr, /*tp_repr*/

&int_as_number, /*tp_as_number*/

0, /*tp_as_sequence*/

0, /*tp_as_mapping*/

};