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/* Float object implementation */
/* XXX There should be overflow checks here, but it's hard to check
for any kind of float exception without losing portability. */
#include "allobjects.h"
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#include <ctype.h>
#include <math.h>
#ifndef THINK_C
extern double fmod PROTO((double, double));
extern double pow PROTO((double, double));
#endif
object *
newfloatobject(fval)
double fval;
{
/* For efficiency, this code is copied from newobject() */
register floatobject *op = (floatobject *) malloc(sizeof(floatobject));
if (op == NULL)
return err_nomem();
NEWREF(op);
op->ob_type = &Floattype;
op->ob_fval = fval;
return (object *) op;
}
double
getfloatvalue(op)
object *op;
{
if (!is_floatobject(op)) {
err_badarg();
return -1;
}
else
return ((floatobject *)op) -> ob_fval;
}
/* Methods */
static void
float_buf_repr(buf, v)
char *buf;
floatobject *v;
{
register char *cp;
/* Subroutine for float_repr and float_print.
We want float numbers to be recognizable as such,
i.e., they should contain a decimal point or an exponent.
However, %g may print the number as an integer;
in such cases, we append ".0" to the string. */
sprintf(buf, "%.12g", v->ob_fval);
cp = buf;
if (*cp == '-')
cp++;
for (; *cp != '\0'; cp++) {
/* Any non-digit means it's not an integer;
this takes care of NAN and INF as well. */
if (!isdigit(*cp))
break;
}
if (*cp == '\0') {
*cp++ = '.';
*cp++ = '0';
*cp++ = '\0';
}
}
static void
float_print(v, fp, flags)
floatobject *v;
FILE *fp;
int flags;
{
char buf[100];
float_buf_repr(buf, v);
fputs(buf, fp);
}
static object *
float_repr(v)
floatobject *v;
{
char buf[100];
float_buf_repr(buf, v);
return newstringobject(buf);
}
static int
float_compare(v, w)
floatobject *v, *w;
{
double i = v->ob_fval;
double j = w->ob_fval;
return (i < j) ? -1 : (i > j) ? 1 : 0;
}
static object *
float_add(v, w)
floatobject *v;
object *w;
{
if (!is_floatobject(w)) {
err_badarg();
return NULL;
}
return newfloatobject(v->ob_fval + ((floatobject *)w) -> ob_fval);
}
static object *
float_sub(v, w)
floatobject *v;
object *w;
{
if (!is_floatobject(w)) {
err_badarg();
return NULL;
}
return newfloatobject(v->ob_fval - ((floatobject *)w) -> ob_fval);
}
static object *
float_mul(v, w)
floatobject *v;
object *w;
{
if (!is_floatobject(w)) {
err_badarg();
return NULL;
}
return newfloatobject(v->ob_fval * ((floatobject *)w) -> ob_fval);
}
static object *
float_div(v, w)
floatobject *v;
object *w;
{
if (!is_floatobject(w)) {
err_badarg();
return NULL;
}
if (((floatobject *)w) -> ob_fval == 0) {
err_setstr(ZeroDivisionError, "float division by zero");
return NULL;
}
return newfloatobject(v->ob_fval / ((floatobject *)w) -> ob_fval);
}
static object *
float_rem(v, w)
floatobject *v;
object *w;
{
double wx;
if (!is_floatobject(w)) {
err_badarg();
return NULL;
}
wx = ((floatobject *)w) -> ob_fval;
if (wx == 0.0) {
err_setstr(ZeroDivisionError, "float division by zero");
return NULL;
}
return newfloatobject(fmod(v->ob_fval, wx));
}
static object *
float_pow(v, w)
floatobject *v;
object *w;
{
double iv, iw, ix;
if (!is_floatobject(w)) {
err_badarg();
return NULL;
}
iv = v->ob_fval;
iw = ((floatobject *)w)->ob_fval;
if (iw == 0.0)
return newfloatobject(1.0); /* x**0 is always 1, even 0**0 */
errno = 0;
ix = pow(iv, iw);
if (errno != 0) {
/* XXX could it be another type of error? */
err_errno(OverflowError);
return NULL;
}
return newfloatobject(ix);
}
static object *
float_neg(v)
floatobject *v;
{
return newfloatobject(-v->ob_fval);
}
static object *
float_pos(v)
floatobject *v;
{
return newfloatobject(v->ob_fval);
}
static number_methods float_as_number = {
float_add, /*tp_add*/
float_sub, /*tp_subtract*/
float_mul, /*tp_multiply*/
float_div, /*tp_divide*/
float_rem, /*tp_remainder*/
float_pow, /*tp_power*/
float_neg, /*tp_negate*/
float_pos, /*tp_plus*/
};
typeobject Floattype = {
OB_HEAD_INIT(&Typetype)
0,
"float",
sizeof(floatobject),
0,
free, /*tp_dealloc*/
float_print, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
float_compare, /*tp_compare*/
float_repr, /*tp_repr*/
&float_as_number, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
};
/*
XXX This is not enough. Need:
- automatic casts for mixed arithmetic (3.1 * 4)
- mixed comparisons (!)
- look at other uses of ints that could be extended to floats
*/
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