usr/src/lib/libbc/libc/crt/sparc/_ftou.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 #pragma ident   "%Z%%M% %I%     %E% SMI"
  23
  24 /*
  25  * Copyright (c) 1987 by Sun Microsystems, Inc.
  26  */
  27
  28 unsigned
  29 _dtou(d)
  30         double          d;
  31 {
  32         /* Convert double to unsigned.     */
  33
  34         int             id;
  35
  36         /*
  37          * id = d is correct if 0 <= d < 2**31, and good enough if d is NaN
  38          * or d < 0 or d >= 2**32.  Otherwise, since the result (int) d of
  39          * converting 2**31 <= d < 2**32 is unknown, adjust d before the
  40          * conversion.
  41          */
  42
  43         if (d >= 2147483648.0)
  44                 id = 0x80000000 | (int) (d - 2147483648.0);
  45         else
  46                 id = (int) d;
  47         return (unsigned) id;
  48 }
  49
  50 unsigned
  51 _ftou(dd)
  52         int          dd;                /* really float */
  53 {
  54         /* Convert float to unsigned.     */
  55
  56         int             id;
  57         double          d = (double) *((float *)(&dd));
  58         /*
  59          * id = d is correct if 0 <= d < 2**31, and good enough if d is NaN
  60          * or d < 0 or d >= 2**32.  Otherwise, since the result (int) d of
  61          * converting 2**31 <= d < 2**32 is unknown, adjust d before the
  62          * conversion.
  63          */
  64
  65         if (d >= 2147483648.0)
  66                 id = 0x80000000 | (int) (d - 2147483648.0);
  67         else
  68                 id = (int) d;
  69         return (unsigned) id;
  70 }