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518 lines
9.2 KiB
C
518 lines
9.2 KiB
C
/***********************************************************
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Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
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Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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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 not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Integer object implementation */
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#include "allobjects.h"
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/* Standard Booleans */
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intobject FalseObject = {
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OB_HEAD_INIT(&Inttype)
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0
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};
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intobject TrueObject = {
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OB_HEAD_INIT(&Inttype)
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1
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};
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static object *
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err_ovf(msg)
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char *msg;
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{
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err_setstr(OverflowError, msg);
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return NULL;
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}
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/* Integers are quite normal objects, to make object handling uniform.
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(Using odd pointers to represent integers would save much space
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but require extra checks for this special case throughout the code.)
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Since, a typical Python program spends much of its time allocating
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and deallocating integers, these operations should be very fast.
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Therefore we use a dedicated allocation scheme with a much lower
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overhead (in space and time) than straight malloc(): a simple
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dedicated free list, filled when necessary with memory from malloc().
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*/
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#define BLOCK_SIZE 1000 /* 1K less typical malloc overhead */
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#define N_INTOBJECTS (BLOCK_SIZE / sizeof(intobject))
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static intobject *
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fill_free_list()
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{
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intobject *p, *q;
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p = NEW(intobject, N_INTOBJECTS);
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if (p == NULL)
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return (intobject *)err_nomem();
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q = p + N_INTOBJECTS;
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while (--q > p)
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*(intobject **)q = q-1;
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*(intobject **)q = NULL;
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return p + N_INTOBJECTS - 1;
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}
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static intobject *free_list = NULL;
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object *
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newintobject(ival)
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long ival;
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{
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register intobject *v;
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if (free_list == NULL) {
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if ((free_list = fill_free_list()) == NULL)
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return NULL;
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}
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v = free_list;
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free_list = *(intobject **)free_list;
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NEWREF(v);
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v->ob_type = &Inttype;
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v->ob_ival = ival;
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return (object *) v;
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}
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static void
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int_dealloc(v)
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intobject *v;
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{
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*(intobject **)v = free_list;
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free_list = v;
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}
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long
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getintvalue(op)
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register object *op;
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{
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if (!is_intobject(op)) {
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err_badcall();
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return -1;
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}
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else
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return ((intobject *)op) -> ob_ival;
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}
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/* Methods */
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/* ARGSUSED */
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static int
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int_print(v, fp, flags)
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intobject *v;
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FILE *fp;
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int flags; /* Not used but required by interface */
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{
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fprintf(fp, "%ld", v->ob_ival);
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return 0;
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}
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static object *
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int_repr(v)
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intobject *v;
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{
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char buf[20];
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sprintf(buf, "%ld", v->ob_ival);
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return newstringobject(buf);
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}
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static int
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int_compare(v, w)
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intobject *v, *w;
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{
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register long i = v->ob_ival;
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register long j = w->ob_ival;
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return (i < j) ? -1 : (i > j) ? 1 : 0;
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}
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static object *
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int_add(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b, x;
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a = v->ob_ival;
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b = w->ob_ival;
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x = a + b;
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if ((x^a) < 0 && (x^b) < 0)
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return err_ovf("integer addition");
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return newintobject(x);
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}
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static object *
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int_sub(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b, x;
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a = v->ob_ival;
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b = w->ob_ival;
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x = a - b;
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if ((x^a) < 0 && (x^~b) < 0)
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return err_ovf("integer subtraction");
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return newintobject(x);
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}
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static object *
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int_mul(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b;
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double x;
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a = v->ob_ival;
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b = w->ob_ival;
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x = (double)a * (double)b;
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if (x > 0x7fffffff || x < (double) (long) 0x80000000)
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return err_ovf("integer multiplication");
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return newintobject(a * b);
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}
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static int
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i_divmod(x, y, p_xdivy, p_xmody)
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register intobject *x, *y;
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long *p_xdivy, *p_xmody;
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{
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long xi = x->ob_ival;
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long yi = y->ob_ival;
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long xdivy, xmody;
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if (yi == 0) {
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err_setstr(ZeroDivisionError, "integer division or modulo");
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return -1;
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}
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if (yi < 0) {
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if (xi < 0)
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xdivy = -xi / -yi;
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else
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xdivy = - (xi / -yi);
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}
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else {
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if (xi < 0)
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xdivy = - (-xi / yi);
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else
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xdivy = xi / yi;
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}
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xmody = xi - xdivy*yi;
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if (xmody < 0 && yi > 0 || xmody > 0 && yi < 0) {
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xmody += yi;
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xdivy -= 1;
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}
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*p_xdivy = xdivy;
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*p_xmody = xmody;
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return 0;
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}
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static object *
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int_div(x, y)
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intobject *x;
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intobject *y;
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{
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long d, m;
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if (i_divmod(x, y, &d, &m) < 0)
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return NULL;
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return newintobject(d);
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}
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static object *
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int_mod(x, y)
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intobject *x;
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intobject *y;
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{
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long d, m;
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if (i_divmod(x, y, &d, &m) < 0)
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return NULL;
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return newintobject(m);
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}
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static object *
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int_divmod(x, y)
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intobject *x;
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intobject *y;
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{
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object *v, *v0, *v1;
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long d, m;
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if (i_divmod(x, y, &d, &m) < 0)
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return NULL;
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v = newtupleobject(2);
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v0 = newintobject(d);
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v1 = newintobject(m);
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if (v == NULL || v0 == NULL || v1 == NULL ||
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settupleitem(v, 0, v0) != 0 ||
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settupleitem(v, 1, v1) != 0) {
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XDECREF(v);
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XDECREF(v0);
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XDECREF(v1);
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v = NULL;
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}
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return v;
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}
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static object *
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int_pow(v, w)
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intobject *v;
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intobject *w;
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{
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register long iv, iw, ix;
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iv = v->ob_ival;
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iw = w->ob_ival;
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if (iw < 0) {
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err_setstr(ValueError, "integer to the negative power");
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return NULL;
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}
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ix = 1;
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while (--iw >= 0) {
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long prev = ix;
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ix = ix * iv;
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if (iv == 0)
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break; /* 0 to some power -- avoid ix / 0 */
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if (ix / iv != prev)
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return err_ovf("integer pow()");
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}
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return newintobject(ix);
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}
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static object *
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int_neg(v)
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intobject *v;
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{
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register long a, x;
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a = v->ob_ival;
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x = -a;
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if (a < 0 && x < 0)
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return err_ovf("integer negation");
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return newintobject(x);
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}
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static object *
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int_pos(v)
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intobject *v;
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{
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INCREF(v);
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return (object *)v;
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}
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static object *
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int_abs(v)
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intobject *v;
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{
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if (v->ob_ival >= 0)
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return int_pos(v);
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else
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return int_neg(v);
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}
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static int
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int_nonzero(v)
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intobject *v;
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{
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return v->ob_ival != 0;
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}
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static object *
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int_invert(v)
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intobject *v;
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{
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return newintobject(~v->ob_ival);
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}
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static object *
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int_lshift(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b;
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a = v->ob_ival;
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b = w->ob_ival;
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if (b < 0) {
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err_setstr(ValueError, "negative shift count");
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return NULL;
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}
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if (a == 0 || b == 0) {
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INCREF(v);
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return (object *) v;
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}
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if (b >= 32) {
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return newintobject(0L);
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}
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a = (unsigned long)a << b;
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return newintobject(a);
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}
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static object *
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int_rshift(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b;
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a = v->ob_ival;
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b = w->ob_ival;
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if (b < 0) {
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err_setstr(ValueError, "negative shift count");
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return NULL;
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}
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if (a == 0 || b == 0) {
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INCREF(v);
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return (object *) v;
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}
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if (b >= 32) {
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if (a < 0)
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a = -1;
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else
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a = 0;
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}
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else {
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if (a < 0)
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a = ~( ~(unsigned long)a >> b );
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else
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a = (unsigned long)a >> b;
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}
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return newintobject(a);
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}
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static object *
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int_and(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b;
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a = v->ob_ival;
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b = w->ob_ival;
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return newintobject(a & b);
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}
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static object *
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int_xor(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b;
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a = v->ob_ival;
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b = w->ob_ival;
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return newintobject(a ^ b);
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}
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static object *
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int_or(v, w)
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intobject *v;
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intobject *w;
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{
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register long a, b;
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a = v->ob_ival;
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b = w->ob_ival;
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return newintobject(a | b);
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}
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static object *
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int_int(v)
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object *v;
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{
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INCREF(v);
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return v;
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}
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static object *
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int_long(v)
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object *v;
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{
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long x = getintvalue(v);
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return newlongobject(x);
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}
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static object *
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int_float(v)
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object *v;
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{
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long x = getintvalue(v);
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return newfloatobject((double)x);
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}
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static object *
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int_oct(v)
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object *v;
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{
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char buf[20];
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long x = getintvalue(v);
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if (x == 0)
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strcpy(buf, "0");
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else if (x > 0)
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sprintf(buf, "0%lo", x);
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else
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sprintf(buf, "-0%lo", -x);
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return newstringobject(buf);
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}
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static object *
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int_hex(v)
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object *v;
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{
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char buf[20];
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long x = getintvalue(v);
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if (x >= 0)
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sprintf(buf, "0x%lx", x);
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else
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sprintf(buf, "-0x%lx", -x);
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return newstringobject(buf);
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}
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static number_methods int_as_number = {
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int_add, /*nb_add*/
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int_sub, /*nb_subtract*/
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int_mul, /*nb_multiply*/
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int_div, /*nb_divide*/
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int_mod, /*nb_remainder*/
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int_divmod, /*nb_divmod*/
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int_pow, /*nb_power*/
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int_neg, /*nb_negative*/
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int_pos, /*nb_positive*/
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int_abs, /*nb_absolute*/
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int_nonzero, /*nb_nonzero*/
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int_invert, /*nb_invert*/
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int_lshift, /*nb_lshift*/
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int_rshift, /*nb_rshift*/
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int_and, /*nb_and*/
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int_xor, /*nb_xor*/
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int_or, /*nb_or*/
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0, /*nb_coerce*/
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int_int, /*nb_int*/
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int_long, /*nb_long*/
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int_float, /*nb_float*/
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int_oct, /*nb_oct*/
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int_hex, /*nb_hex*/
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};
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typeobject Inttype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"int",
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sizeof(intobject),
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0,
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int_dealloc, /*tp_dealloc*/
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int_print, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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int_compare, /*tp_compare*/
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int_repr, /*tp_repr*/
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&int_as_number, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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};
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