Added Igor Zlatkovic as official maintainer Albert Chin pointed that

* AUTHORS HACKING: Added Igor Zlatkovic as official maintainer
* python/Makefile.am python/tests/Makefile.am: Albert Chin pointed
  that $(datadir) should be used for docs
Daniel

1 files changed, 41 insertions, 0 deletions

diff --git a/trionan.c b/trionan.c
index 0f70f5a3..59e63a9f 100644
--- a/trionan.c
+++ b/trionan.c
@@ -145,6 +145,11 @@ static const char rcsid[] = "@(#)$Id$";
 
 static TRIO_CONST double internalEndianMagic = 7.949928895127363e-275;
 
+/* Mask for the sign */
+static TRIO_CONST unsigned char ieee_754_sign_mask[] = {
+  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
 /* Mask for the exponent */
 static TRIO_CONST unsigned char ieee_754_exponent_mask[] = {
   0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
@@ -155,6 +160,11 @@ static TRIO_CONST unsigned char ieee_754_mantissa_mask[] = {
   0x00, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
 };
 
+/* Bit-pattern for negative zero */
+static TRIO_CONST unsigned char ieee_754_negzero_array[] = {
+  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
 /* Bit-pattern for infinity */
 static TRIO_CONST unsigned char ieee_754_infinity_array[] = {
   0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
@@ -207,6 +217,37 @@ trio_is_special_quantity(double number,
   return is_special_quantity;
 }
 
+/**
+   Get the sign value
+
+   @return 1 for negative, 0 for positive
+*/
+TRIO_PUBLIC int
+trio_get_sign(double number) 
+{
+  unsigned int i;
+  unsigned char current;
+  int sign = (1 == 1);
+
+  for (i = 0; i < (unsigned int)sizeof(double); i++) {
+    current = ((unsigned char *)&number)[TRIO_DOUBLE_INDEX(i)];
+    sign
+      &= ((current & ieee_754_sign_mask[i]) == ieee_754_sign_mask[i]);
+  }
+  return sign;
+}
+
+/**
+   Generate negative zero
+
+   @return Floating-point representation of negative zero.
+*/
+TRIO_PUBLIC double
+trio_nzero(void) 
+{
+  return trio_make_double(ieee_754_negzero_array);
+}
+
 #endif /* USE_IEEE_754 */