Initial revision

From-SVN: r26263

libjava/java/lang/natDouble.cc

@@ -0,0 +1,180 @@
+// natDouble.cc - Implementation of java.lang.Double native methods.
+
+/* Copyright (C) 1998, 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+/* AIX requires this to be the first thing in the file.  */
+#ifndef __GNUC__
+# if HAVE_ALLOCA_H
+#  include <alloca.h>
+# else
+#  ifdef _AIX
+ #pragma alloca
+#  else
+#   ifndef alloca /* predefined by HP cc +Olibcalls */
+char *alloca ();
+#   endif
+#  endif
+# endif
+#endif
+
+#include <stdlib.h>
+
+#include <cni.h>
+#include <java/lang/String.h>
+#include <java/lang/Double.h>
+#include <java/lang/NumberFormatException.h>
+#include <jvm.h>
+
+#include <stdio.h>
+#include <string.h>
+
+#include "mprec.h"
+
+union u
+{
+  jlong l;
+  jdouble d;
+};
+
+jlong 
+java::lang::Double::doubleToLongBits(jdouble value)
+{
+  union u u;
+  u.d = value;
+  return u.l;
+}
+
+jdouble 
+java::lang::Double::longBitsToDouble(jlong bits)
+{
+  union u u;
+  u.l = bits;
+  return u.d;
+}
+
+jstring 
+java::lang::Double::toString(jdouble value, jboolean isFloat)
+{
+  if (isNaN (value))
+    return JvNewStringLatin1 ("NaN", sizeof ("NaN") - 1);
+    
+  if (value == POSITIVE_INFINITY)
+    return JvNewStringLatin1 ("Infinity", sizeof ("Infinity") - 1);
+    
+  if (value == NEGATIVE_INFINITY)
+    return JvNewStringLatin1 ("-Infinity", sizeof ("-Infinity") - 1);
+    
+  char buffer[50], result[50];
+  int decpt, sign;
+
+  _dtoa (value, 0, 20, &decpt, &sign, NULL, buffer, (int)isFloat);
+
+  value = fabs (value);
+
+  char *s = buffer;
+  char *d = result;
+
+  if (sign)
+    *d++ = '-';
+
+  if (value >= 1e-3 && value < 1e7 || value == 0)
+    {
+      if (decpt <= 0)
+	*d++ = '0';
+      else
+	{
+	  for (int 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 JvNewStringLatin1 (result, strlen (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 JvNewStringLatin1 (result, strlen (result));
+}
+
+jdouble 
+java::lang::Double::doubleValueOf(jstring str)
+{
+  int length = str->length();
+  // Note that UTF can expand 3x.
+
+#ifdef HAVE_ALLOCA
+  char *data = (char *) alloca (3 * length + 1);
+#else
+#error --- need an alternate implementation here ---
+#endif
+
+  data[_Jv_GetStringUTFRegion (str, 0, length, data)] = 0; 
+
+  struct _Jv_reent reent;  
+  memset (&reent, 0, sizeof reent);
+
+  double val = _strtod_r (&reent, data, NULL);
+
+  if (reent._errno)
+    _Jv_Throw (new NumberFormatException);
+
+  return val;
+}