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348 lines
6.9 KiB
C
348 lines
6.9 KiB
C
/***********************************************************
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Copyright 1991 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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/* Float object implementation */
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/* XXX There should be overflow checks here, but it's hard to check
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for any kind of float exception without losing portability. */
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#include "allobjects.h"
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include <ctype.h>
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#include <math.h>
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#ifndef THINK_C
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extern double fmod PROTO((double, double));
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extern double pow PROTO((double, double));
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#endif
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object *
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newfloatobject(fval)
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double fval;
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{
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/* For efficiency, this code is copied from newobject() */
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register floatobject *op = (floatobject *) malloc(sizeof(floatobject));
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if (op == NULL)
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return err_nomem();
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NEWREF(op);
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op->ob_type = &Floattype;
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op->ob_fval = fval;
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return (object *) op;
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}
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double
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getfloatvalue(op)
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object *op;
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{
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if (!is_floatobject(op)) {
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err_badarg();
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return -1;
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}
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else
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return ((floatobject *)op) -> ob_fval;
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}
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/* Methods */
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void
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float_buf_repr(buf, v)
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char *buf;
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floatobject *v;
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{
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register char *cp;
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/* Subroutine for float_repr and float_print.
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We want float numbers to be recognizable as such,
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i.e., they should contain a decimal point or an exponent.
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However, %g may print the number as an integer;
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in such cases, we append ".0" to the string. */
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sprintf(buf, "%.12g", v->ob_fval);
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cp = buf;
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if (*cp == '-')
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cp++;
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for (; *cp != '\0'; cp++) {
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/* Any non-digit means it's not an integer;
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this takes care of NAN and INF as well. */
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if (!isdigit(*cp))
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break;
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}
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if (*cp == '\0') {
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*cp++ = '.';
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*cp++ = '0';
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*cp++ = '\0';
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}
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}
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static int
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float_print(v, fp, flags)
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floatobject *v;
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FILE *fp;
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int flags;
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{
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char buf[100];
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float_buf_repr(buf, v);
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fputs(buf, fp);
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return 0;
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}
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static object *
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float_repr(v)
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floatobject *v;
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{
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char buf[100];
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float_buf_repr(buf, v);
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return newstringobject(buf);
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}
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static int
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float_compare(v, w)
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floatobject *v, *w;
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{
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double i = v->ob_fval;
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double j = w->ob_fval;
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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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float_add(v, w)
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floatobject *v;
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object *w;
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{
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if (!is_floatobject(w)) {
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err_badarg();
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return NULL;
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}
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return newfloatobject(v->ob_fval + ((floatobject *)w) -> ob_fval);
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}
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static object *
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float_sub(v, w)
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floatobject *v;
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object *w;
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{
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if (!is_floatobject(w)) {
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err_badarg();
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return NULL;
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}
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return newfloatobject(v->ob_fval - ((floatobject *)w) -> ob_fval);
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}
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static object *
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float_mul(v, w)
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floatobject *v;
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object *w;
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{
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if (!is_floatobject(w)) {
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err_badarg();
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return NULL;
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}
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return newfloatobject(v->ob_fval * ((floatobject *)w) -> ob_fval);
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}
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static object *
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float_div(v, w)
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floatobject *v;
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object *w;
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{
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if (!is_floatobject(w)) {
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err_badarg();
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return NULL;
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}
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if (((floatobject *)w) -> ob_fval == 0) {
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err_setstr(ZeroDivisionError, "float division");
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return NULL;
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}
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return newfloatobject(v->ob_fval / ((floatobject *)w) -> ob_fval);
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}
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static object *
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float_rem(v, w)
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floatobject *v;
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object *w;
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{
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double wx;
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if (!is_floatobject(w)) {
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err_badarg();
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return NULL;
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}
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wx = ((floatobject *)w) -> ob_fval;
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if (wx == 0.0) {
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err_setstr(ZeroDivisionError, "float remainder");
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return NULL;
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}
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return newfloatobject(fmod(v->ob_fval, wx));
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}
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static object *
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float_divmod(v, w)
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floatobject *v;
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object *w;
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{
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double vx, wx;
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double div, mod;
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object *t;
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if (!is_floatobject(w)) {
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err_badarg();
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return NULL;
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}
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wx = ((floatobject *)w) -> ob_fval;
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if (wx == 0.0) {
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err_setstr(ZeroDivisionError, "float divmod()");
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return NULL;
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}
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vx = v->ob_fval;
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mod = fmod(vx, wx);
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div = (vx - mod) / wx;
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if (wx*mod < 0) {
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mod += wx;
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div -= 1.0;
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}
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t = newtupleobject(2);
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if (t != NULL) {
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settupleitem(t, 0, newfloatobject(div));
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settupleitem(t, 1, newfloatobject(mod));
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if (err_occurred()) {
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DECREF(t);
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t = NULL;
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}
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}
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return t;
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}
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static object *
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float_pow(v, w)
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floatobject *v;
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object *w;
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{
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double iv, iw, ix;
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if (!is_floatobject(w)) {
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err_badarg();
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return NULL;
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}
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iv = v->ob_fval;
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iw = ((floatobject *)w)->ob_fval;
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/* Sort out special cases here instead of relying on pow() */
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if (iw == 0.0)
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return newfloatobject(1.0); /* x**0 is 1, even 0**0 */
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if (iv == 0.0) {
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if (iw < 0.0) {
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err_setstr(ValueError, "0.0 to the negative power");
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return NULL;
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}
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return newfloatobject(0.0);
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}
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if (iv < 0.0) {
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err_setstr(ValueError, "negative float to float power");
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return NULL;
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}
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errno = 0;
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ix = pow(iv, iw);
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if (errno != 0) {
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/* XXX could it be another type of error? */
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err_errno(OverflowError);
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return NULL;
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}
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return newfloatobject(ix);
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}
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static object *
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float_neg(v)
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floatobject *v;
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{
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return newfloatobject(-v->ob_fval);
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}
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static object *
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float_pos(v)
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floatobject *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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float_abs(v)
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floatobject *v;
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{
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if (v->ob_fval < 0)
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return float_neg(v);
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else
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return float_pos(v);
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}
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static int
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float_nonzero(v)
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floatobject *v;
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{
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return v->ob_fval != 0.0;
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}
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static number_methods float_as_number = {
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float_add, /*nb_add*/
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float_sub, /*nb_subtract*/
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float_mul, /*nb_multiply*/
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float_div, /*nb_divide*/
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float_rem, /*nb_remainder*/
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float_divmod, /*nb_divmod*/
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float_pow, /*nb_power*/
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float_neg, /*nb_negative*/
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float_pos, /*nb_positive*/
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float_abs, /*nb_absolute*/
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float_nonzero, /*nb_nonzero*/
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0, /*nb_invert*/
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0, /*nb_lshift*/
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0, /*nb_rshift*/
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0, /*nb_and*/
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0, /*nb_xor*/
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0, /*nb_or*/
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};
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typeobject Floattype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"float",
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sizeof(floatobject),
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0,
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free, /*tp_dealloc*/
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float_print, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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float_compare, /*tp_compare*/
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float_repr, /*tp_repr*/
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&float_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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/*
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XXX This is not enough. Need:
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- automatic casts for mixed arithmetic (3.1 * 4)
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- mixed comparisons (!)
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- look at other uses of ints that could be extended to floats
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*/
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