path: root/native/jni/java-lang/java_lang_Double.c

/* Double.c - java.lang.Double native functions
   Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */


#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "mprec.h"
#include "fdlibm.h"
#include "jcl.h"

#include "java_lang_Double.h"

static jmethodID isNaNID;
static jdouble NEGATIVE_INFINITY;
static jdouble POSITIVE_INFINITY;

/*
 * Class:     java_lang_Double
 * Method:    initIDs
 * Signature: ()
 */
JNIEXPORT void JNICALL Java_java_lang_Double_initIDs
  (JNIEnv *env, jclass cls)
{
  jfieldID negInfID;
  jfieldID posInfID;

  isNaNID = (*env)->GetStaticMethodID(env, cls, "isNaN", "(D)Z");
  if (isNaNID == NULL)
    {
      DBG("unable to determine method id of isNaN\n")
      return;
    }
  negInfID = (*env)->GetStaticFieldID(env, cls, "NEGATIVE_INFINITY", "D");
  if (negInfID == NULL)
    {
      DBG("unable to determine field id of NEGATIVE_INFINITY\n")
      return;
    }
  posInfID = (*env)->GetStaticFieldID(env, cls, "POSITIVE_INFINITY", "D");
  if (posInfID == NULL)
    {
      DBG("unable to determine field id of POSITIVE_INFINITY\n")
      return;
    }
  POSITIVE_INFINITY = (*env)->GetStaticDoubleField(env, cls, posInfID);
  NEGATIVE_INFINITY = (*env)->GetStaticDoubleField(env, cls, negInfID);

#ifdef DEBUG
  fprintf(stderr, "java.lang.Double.initIDs() POSITIVE_INFINITY = %g\n", POSITIVE_INFINITY);
  fprintf(stderr, "java.lang.Double.initIDs() NEGATIVE_INFINITY = %g\n", NEGATIVE_INFINITY);
#endif
} 

/*
 * Class:     java_lang_Double
 * Method:    doubleToLongBits
 * Signature: (D)J
 */
JNIEXPORT jlong JNICALL Java_java_lang_Double_doubleToLongBits
  (JNIEnv * env, jclass cls, jdouble doubleValue)
{
  jvalue val;
  jlong e, f;
  val.d = doubleValue;
  
  e = val.j & 0x7ff0000000000000LL;
  f = val.j & 0x000fffffffffffffLL;
  
  if (e == 0x7ff0000000000000LL && f != 0L)
    val.j = 0x7ff8000000000000LL;

  return val.j;
}

/*
 * Class:     java_lang_Double
 * Method:    doubleToRawLongBits
 * Signature: (D)J
 */
JNIEXPORT jlong JNICALL Java_java_lang_Double_doubleToRawLongBits
  (JNIEnv * env, jclass cls, jdouble doubleValue)
{
  jvalue val;
  val.d = doubleValue;
  return val.j;
}

/*
 * Class:     java_lang_Double
 * Method:    longBitsToDouble
 * Signature: (J)D
 */
JNIEXPORT jdouble JNICALL Java_java_lang_Double_longBitsToDouble
  (JNIEnv * env, jclass cls, jlong longValue)
{
  jvalue val;
  val.j = longValue;
  return val.d;
}

/*
 * Class:    java_lang_Double
 * Method:   toString(double d)
 * Signature: (D)Ljava/lang/String
 */
JNIEXPORT jstring JNICALL Java_java_lang_Double_toString
  (JNIEnv * env, jclass cls, jdouble value, jboolean isFloat)
{
  char buffer[50], result[50];
  int decpt, sign;
  char *s, *d;
  int i;

#ifdef DEBUG
  fprintf (stderr, "java.lang.Double.toString (%g)\n", value);
#endif

  if ((*env)->CallStaticBooleanMethod(env, cls, isNaNID, value))
    return (*env)->NewStringUTF(env, "NaN");
  
  if (value == POSITIVE_INFINITY)
    return (*env)->NewStringUTF(env, "Infinity");

  if (value == NEGATIVE_INFINITY)
    return (*env)->NewStringUTF(env, "-Infinity");

  _dtoa (value, 0, 20, &decpt, &sign, NULL, buffer, (int)isFloat);

  value = fabs (value);

  s = buffer;
  d = result;

  if (sign)
    *d++ = '-';

  if (value >= 1e-3 && value < 1e7 || value == 0)
    {
      if (decpt <= 0)
	*d++ = '0';
      else
	{
	  for (i = 0; i < decpt; i++)
	    if (*s)
	      *d++ = *s++;
	    else
	      *d++ = '0';
	}

      *d++ = '.';

      if (*s == 0)
	{
	  *d++ = '0';
	  decpt++;
	}
	  
      while (decpt++ < 0)
	*d++ = '0';      
      
      while (*s)
	*d++ = *s++;

      *d = 0;

      return (*env)->NewStringUTF(env, result);
    }

  *d++ = *s++;
  decpt--;
  *d++ = '.';
  
  if (*s == 0)
    *d++ = '0';

  while (*s)
    *d++ = *s++;

  *d++ = 'E';
  
  if (decpt < 0)
    {
      *d++ = '-';
      decpt = -decpt;
    }

  {
    char exp[4];
    char *e = exp + sizeof exp;
    
    *--e = 0;
    do
      {
	*--e = '0' + decpt % 10;
	decpt /= 10;
      }
    while (decpt > 0);

    while (*e)
      *d++ = *e++;
  }
  
  *d = 0;

  return (*env)->NewStringUTF(env, result);
}

/*
 * Class:     java_lang_Double
 * Method:    parseDouble
 * Signature: (Ljava/lang/String)D
 */
JNIEXPORT jdouble JNICALL Java_java_lang_Double_parseDouble
  (JNIEnv * env, jclass cls, jstring str)
{
  jboolean isCopy;
  char *buf, *endptr;
  jdouble val = 0.0;

/*
  if (str == NULL)
    {
      JCL_ThrowException (env, "java/lang/NullPointerException", "null");
      return val;
    }
*/

  buf = (char *) (*env)->GetStringUTFChars(env, str, &isCopy);
  if (buf == NULL)
    {
      /* OutOfMemoryError already thrown */
    }
  else
    {
      unsigned char *p = buf, *end, *last_non_ws;
      int ok = 1;
 
#ifdef DEBUG
      fprintf (stderr, "java.lang.Double.parseDouble (%s)\n", buf);
#endif

      /* Trim the buffer, similar to String.trim().  First the leading
	 characters.  */
      while (*p && *p <= ' ')
 	++p;

      /* Find the last non-whitespace character.  This method is safe
 	 even with multi-byte UTF-8 characters.  */
      end = p;
      last_non_ws = NULL;
      while (*end)
 	{
 	  if (*end > ' ')
 	    last_non_ws = end;
 	  ++end;
 	}

      if (last_non_ws == NULL)
 	last_non_ws = p + strlen (p);
      else
	{
	  /* Skip past the last non-whitespace character.  */
	  ++last_non_ws;
	}

      /* Skip a trailing `f' or `d'.  */
      if (last_non_ws > p
	  && (last_non_ws[-1] == 'f'
	      || last_non_ws[-1] == 'F'
	      || last_non_ws[-1] == 'd'
	      || last_non_ws[-1] == 'D'))
	--last_non_ws;

      if (last_non_ws > p)
 	{
 	  struct _Jv_reent reent;  
 	  memset (&reent, 0, sizeof reent);

#ifdef KISSME_LINUX_USER
 	  val = strtod (p, &endptr);
#else
 	  val = _strtod_r (&reent, p, &endptr);
#endif

#ifdef DEBUG
	  fprintf (stderr, "java.lang.Double.parseDouble val = %g\n", val);
	  fprintf (stderr, "java.lang.Double.parseDouble %i != %i ???\n",
		   endptr, last_non_ws);
#endif
 	  if ((unsigned char *) endptr != last_non_ws)
 	    ok = 0;
 	}
      else
 	ok = 0;

      if (! ok)
 	{
 	  val = 0.0;
 	  JCL_ThrowException (env,
 			      "java/lang/NumberFormatException",
 			      "unable to parse double");
 	}

      (*env)->ReleaseStringUTFChars (env, str, buf);
    }

  return val;
}