179 lines
2.9 KiB
C++
179 lines
2.9 KiB
C++
// natDouble.cc - Implementation of java.lang.Double native methods.
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/* Copyright (C) 1998, 1999, 2000 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#if HAVE_ALLOCA_H
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#include <alloca.h>
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#endif
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#include <stdlib.h>
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#include <gcj/cni.h>
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#include <java/lang/String.h>
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#include <java/lang/Double.h>
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#include <java/lang/NumberFormatException.h>
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#include <jvm.h>
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#include <stdio.h>
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#include <string.h>
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#include "fdlibm.h"
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union u
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{
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jlong l;
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jdouble d;
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};
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jlong
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java::lang::Double::doubleToLongBits(jdouble value)
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{
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union u u;
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u.d = value;
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jlong e = u.l & 0x7ff0000000000000LL;
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jlong f = u.l & 0x000fffffffffffffLL;
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if (e == 0x7ff0000000000000LL && f != 0L)
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u.l = 0x7ff8000000000000LL;
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return u.l;
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}
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jdouble
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java::lang::Double::longBitsToDouble(jlong bits)
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{
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union u u;
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u.l = bits;
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return u.d;
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}
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jstring
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java::lang::Double::toString(jdouble value, jboolean isFloat)
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{
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if (isNaN (value))
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return JvNewStringLatin1 ("NaN", sizeof ("NaN") - 1);
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if (value == POSITIVE_INFINITY)
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return JvNewStringLatin1 ("Infinity", sizeof ("Infinity") - 1);
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if (value == NEGATIVE_INFINITY)
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return JvNewStringLatin1 ("-Infinity", sizeof ("-Infinity") - 1);
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char buffer[50], result[50];
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int decpt, sign;
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_dtoa (value, 0, 20, &decpt, &sign, NULL, buffer, (int)isFloat);
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value = fabs (value);
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char *s = buffer;
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char *d = result;
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if (sign)
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*d++ = '-';
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if (value >= 1e-3 && value < 1e7 || value == 0)
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{
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if (decpt <= 0)
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*d++ = '0';
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else
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{
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for (int i = 0; i < decpt; i++)
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if (*s)
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*d++ = *s++;
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else
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*d++ = '0';
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}
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*d++ = '.';
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if (*s == 0)
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{
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*d++ = '0';
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decpt++;
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}
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while (decpt++ < 0)
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*d++ = '0';
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while (*s)
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*d++ = *s++;
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*d = 0;
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return JvNewStringLatin1 (result, strlen (result));
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}
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*d++ = *s++;
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decpt--;
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*d++ = '.';
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if (*s == 0)
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*d++ = '0';
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while (*s)
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*d++ = *s++;
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*d++ = 'E';
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if (decpt < 0)
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{
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*d++ = '-';
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decpt = -decpt;
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}
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{
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char exp[4];
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char *e = exp + sizeof exp;
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*--e = 0;
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do
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{
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*--e = '0' + decpt % 10;
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decpt /= 10;
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}
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while (decpt > 0);
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while (*e)
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*d++ = *e++;
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}
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*d = 0;
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return JvNewStringLatin1 (result, strlen (result));
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}
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jdouble
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java::lang::Double::parseDouble(jstring str)
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{
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int length = str->length();
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// Note that UTF can expand 3x.
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#ifdef HAVE_ALLOCA
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char *data = (char *) alloca (3 * length + 1);
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#else
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#error --- need an alternate implementation here ---
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#endif
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data[_Jv_GetStringUTFRegion (str, 0, length, data)] = 0;
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struct _Jv_reent reent;
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memset (&reent, 0, sizeof reent);
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double val = _strtod_r (&reent, data, NULL);
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if (reent._errno)
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_Jv_Throw (new NumberFormatException);
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return val;
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}
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