/*********************************************************** 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. ******************************************************************/ /* 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 */ 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 int float_print(v, fp, flags) floatobject *v; FILE *fp; int flags; { 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 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_divmod(v, w) floatobject *v; object *w; { double wx; if (!is_floatobject(w)) { err_badarg(); return NULL; } err_setstr(RuntimeError, "divmod() on float not implemented"); return NULL; } 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; /* 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(RuntimeError, "0.0 to the negative power"); return NULL; } return newfloatobject(0.0); } if (iv < 0.0) { err_setstr(RuntimeError, "negative float to float power"); return NULL; } 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; { 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 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*/ }; 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 */