__uitrunc implementation.

sysdeps/unix/sysv/aix/uitrunc.c

@@ -0,0 +1,42 @@
+/* Copyright (C) 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <math.h>
+
+/* The uitrunc function returns the nearest unsigned integer
+   to the x parameter in the direction of 0. This actions is
+   equivalent to truncation off the fraction bits of the x
+   parameter and then converting x to an unsigned integer. */
+unsigned int
+__uitrunc (double x)
+{
+  double xrf;
+  unsigned int xr;
+  xr = (unsigned int) x;
+  xrf = (double) xr;
+  if (x >= 0.0)
+    if (x - xrf >= 0.5 && x - xrf < 1.0 && x + 1 > 0)
+      return x + 1;
+    else
+      return x;
+  else
+    if (xrf - x >= 0.5 && xrf - x < 1.0 && x - 1 < 0)
+      return x - 1;
+    else
+      return x;
+}