--- gforth/float.fs	2007/12/31 17:34:58	1.52
+++ gforth/float.fs	2009/05/24 17:36:36	1.54
@@ -6,7 +6,7 @@
 
 \ Gforth 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
+\ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.
 
 \ This program is distributed in the hope that it will be useful,
@@ -15,8 +15,7 @@
 \ GNU General Public License for more details.
 
 \ You should have received a copy of the GNU General Public License
-\ along with this program; if not, write to the Free Software
-\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+\ along with this program. If not, see http://www.gnu.org/licenses/.
 
 \ 1 cells 4 = [IF]
 \ ' cells   Alias sfloats
@@ -234,14 +233,23 @@ set-current
 	fnegate f~rel
     THEN ;
 
+-0e fp@ c@ $80 = [if] 0 [else] 7 [endif] constant fsign-offset
+
+: fcopysign ( r1 r2 -- r3 ) \ gforth
+\G r3 takes its absolute value from r1 and its sign from r2
+    \ !! implementation relies on IEEE DP format
+    fp@ dup fsign-offset + dup c@ $80 and >r ( r1 r2 addr-r1sign )
+    float + dup c@ $7f and r> or swap c!
+    fdrop ;
+
 \ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com>
 \ not sure if they are a good idea
 
-: FTRUNC ( r1 -- r2 )
+: ftrunc ( r1 -- r2 ) \ X:ftrunc
     \ round towards 0
-    \ !! should be implemented properly
-    F>D D>F ;
+    fdup fabs floor fswap fcopysign ;
 
 : FMOD ( r1 r2 -- r )
     \ remainder of r1/r2
     FOVER FOVER F/ ftrunc F* F- ;
+