| /*********************************************************** |
| Copyright 1991, 1992, 1993 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. |
| |
| ******************************************************************/ |
| |
| /* 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 "modsupport.h" |
| |
| #include <errno.h> |
| #include <ctype.h> |
| #include <math.h> |
| |
| #ifdef i860 |
| /* Cray APP has bogus definition of HUGE_VAL in <math.h> */ |
| #undef HUGE_VAL |
| #endif |
| |
| #ifdef HUGE_VAL |
| #define CHECK(x) if (errno != 0) ; \ |
| else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \ |
| else errno = ERANGE |
| #else |
| #define CHECK(x) /* Don't know how to check */ |
| #endif |
| |
| #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; |
| } |
| |
| static void |
| float_dealloc(op) |
| object *op; |
| { |
| DEL(op); |
| } |
| |
| double |
| getfloatvalue(op) |
| object *op; |
| { |
| if (!is_floatobject(op)) { |
| err_badarg(); |
| return -1; |
| } |
| else |
| return ((floatobject *)op) -> ob_fval; |
| } |
| |
| /* Methods */ |
| |
| 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'; |
| } |
| } |
| |
| /* ARGSUSED */ |
| static int |
| float_print(v, fp, flags) |
| floatobject *v; |
| FILE *fp; |
| int flags; /* Not used but required by interface */ |
| { |
| char buf[100]; |
| float_buf_repr(buf, v); |
| fputs(buf, fp); |
| return 0; |
| } |
| |
| 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 long |
| float_hash(v) |
| floatobject *v; |
| { |
| double intpart, fractpart; |
| int expo; |
| long x; |
| /* This is designed so that Python numbers with the same |
| value hash to the same value, otherwise comparisons |
| of mapping keys will turn out weird */ |
| fractpart = modf(v->ob_fval, &intpart); |
| if (fractpart == 0.0) { |
| if (intpart > 0x7fffffffL || -intpart > 0x7fffffffL) { |
| /* Convert to long int and use its hash... */ |
| object *w = dnewlongobject(v->ob_fval); |
| if (w == NULL) |
| return -1; |
| x = hashobject(w); |
| DECREF(w); |
| return x; |
| } |
| x = (long)intpart; |
| } |
| else { |
| fractpart = frexp(fractpart, &expo); |
| fractpart = fractpart*4294967296.0; /* 2**32 */ |
| x = (long) (intpart + fractpart) ^ expo; /* Rather arbitrary */ |
| } |
| if (x == -1) |
| x = -2; |
| return x; |
| } |
| |
| static object * |
| float_add(v, w) |
| floatobject *v; |
| floatobject *w; |
| { |
| return newfloatobject(v->ob_fval + w->ob_fval); |
| } |
| |
| static object * |
| float_sub(v, w) |
| floatobject *v; |
| floatobject *w; |
| { |
| return newfloatobject(v->ob_fval - w->ob_fval); |
| } |
| |
| static object * |
| float_mul(v, w) |
| floatobject *v; |
| floatobject *w; |
| { |
| return newfloatobject(v->ob_fval * w->ob_fval); |
| } |
| |
| static object * |
| float_div(v, w) |
| floatobject *v; |
| floatobject *w; |
| { |
| if (w->ob_fval == 0) { |
| err_setstr(ZeroDivisionError, "float division"); |
| return NULL; |
| } |
| return newfloatobject(v->ob_fval / w->ob_fval); |
| } |
| |
| static object * |
| float_rem(v, w) |
| floatobject *v; |
| floatobject *w; |
| { |
| double vx, wx; |
| double /* div, */ mod; |
| wx = w->ob_fval; |
| if (wx == 0.0) { |
| err_setstr(ZeroDivisionError, "float modulo"); |
| return NULL; |
| } |
| vx = v->ob_fval; |
| mod = fmod(vx, wx); |
| /* div = (vx - mod) / wx; */ |
| if (wx*mod < 0) { |
| mod += wx; |
| /* div -= 1.0; */ |
| } |
| return newfloatobject(mod); |
| } |
| |
| static object * |
| float_divmod(v, w) |
| floatobject *v; |
| floatobject *w; |
| { |
| double vx, wx; |
| double div, mod; |
| object *t; |
| wx = w->ob_fval; |
| if (wx == 0.0) { |
| err_setstr(ZeroDivisionError, "float divmod()"); |
| return NULL; |
| } |
| vx = v->ob_fval; |
| mod = fmod(vx, wx); |
| div = (vx - mod) / wx; |
| if (wx*mod < 0) { |
| mod += wx; |
| div -= 1.0; |
| } |
| return mkvalue("(dd)", div, mod); |
| } |
| |
| static object * |
| float_pow(v, w) |
| floatobject *v; |
| floatobject *w; |
| { |
| double iv, iw, ix; |
| iv = v->ob_fval; |
| iw = w->ob_fval; |
| /* Sort out special cases here instead of relying on pow() */ |
| if (iw == 0.0) |
| return newfloatobject(1.0); /* x**0 is 1, even 0**0 */ |
| if (iv == 0.0) { |
| if (iw < 0.0) { |
| err_setstr(ValueError, "0.0 to the negative power"); |
| return NULL; |
| } |
| return newfloatobject(0.0); |
| } |
| if (iv < 0.0) { |
| err_setstr(ValueError, "negative float to float power"); |
| return NULL; |
| } |
| errno = 0; |
| ix = pow(iv, iw); |
| CHECK(ix); |
| 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; |
| { |
| INCREF(v); |
| return (object *)v; |
| } |
| |
| static object * |
| float_abs(v) |
| floatobject *v; |
| { |
| if (v->ob_fval < 0) |
| return float_neg(v); |
| else |
| return float_pos(v); |
| } |
| |
| static int |
| float_nonzero(v) |
| floatobject *v; |
| { |
| return v->ob_fval != 0.0; |
| } |
| |
| static int |
| float_coerce(pv, pw) |
| object **pv; |
| object **pw; |
| { |
| if (is_intobject(*pw)) { |
| long x = getintvalue(*pw); |
| *pw = newfloatobject((double)x); |
| INCREF(*pv); |
| return 0; |
| } |
| else if (is_longobject(*pw)) { |
| *pw = newfloatobject(dgetlongvalue(*pw)); |
| INCREF(*pv); |
| return 0; |
| } |
| return 1; /* Can't do it */ |
| } |
| |
| static object * |
| float_int(v) |
| object *v; |
| { |
| double x = getfloatvalue(v); |
| /* XXX should check for overflow */ |
| /* XXX should define how we round */ |
| return newintobject((long)x); |
| } |
| |
| static object * |
| float_long(v) |
| object *v; |
| { |
| double x = getfloatvalue(v); |
| return dnewlongobject(x); |
| } |
| |
| static object * |
| float_float(v) |
| object *v; |
| { |
| INCREF(v); |
| return v; |
| } |
| |
| |
| static number_methods float_as_number = { |
| float_add, /*nb_add*/ |
| float_sub, /*nb_subtract*/ |
| float_mul, /*nb_multiply*/ |
| float_div, /*nb_divide*/ |
| float_rem, /*nb_remainder*/ |
| float_divmod, /*nb_divmod*/ |
| float_pow, /*nb_power*/ |
| float_neg, /*nb_negative*/ |
| float_pos, /*nb_positive*/ |
| float_abs, /*nb_absolute*/ |
| float_nonzero, /*nb_nonzero*/ |
| 0, /*nb_invert*/ |
| 0, /*nb_lshift*/ |
| 0, /*nb_rshift*/ |
| 0, /*nb_and*/ |
| 0, /*nb_xor*/ |
| 0, /*nb_or*/ |
| float_coerce, /*nb_coerce*/ |
| float_int, /*nb_int*/ |
| float_long, /*nb_long*/ |
| float_float, /*nb_float*/ |
| 0, /*nb_oct*/ |
| 0, /*nb_hex*/ |
| }; |
| |
| typeobject Floattype = { |
| OB_HEAD_INIT(&Typetype) |
| 0, |
| "float", |
| sizeof(floatobject), |
| 0, |
| float_dealloc, /*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*/ |
| float_hash, /*tp_hash */ |
| }; |