5261 libm should stop using synonyms.h
5298 fabs is 0-sized, confuses dis(1) and others
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Approved by: Gordon Ross <gwr@nexenta.com>

          --- old/usr/src/lib/libm/common/complex/cacosh.c
          +++ new/usr/src/lib/libm/common/complex/cacosh.c

   1    1  /*
   2    2   * CDDL HEADER START
   3    3   *
   4    4   * The contents of this file are subject to the terms of the
   5    5   * Common Development and Distribution License (the "License").
   6    6   * You may not use this file except in compliance with the License.
   7    7   *
   8    8   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9    9   * or http://www.opensolaris.org/os/licensing.
  10   10   * See the License for the specific language governing permissions
  11   11   * and limitations under the License.
  12   12   *
  13   13   * When distributing Covered Code, include this CDDL HEADER in each
  14   14   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15   15   * If applicable, add the following below this CDDL HEADER, with the
  16   16   * fields enclosed by brackets "[]" replaced with your own identifying
  17   17   * information: Portions Copyright [yyyy] [name of copyright owner]
  18   18   *
  19   19   * CDDL HEADER END

  20   20   */
  21   21  
  22   22  /*
  23   23   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24   24   */
  25   25  /*
  26   26   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27   27   * Use is subject to license terms.
  28   28   */
  29   29  
  30      -#pragma weak cacosh = __cacosh
       30 +#pragma weak __cacosh = cacosh
  31   31  
  32   32  /* INDENT OFF */
  33   33  /*
  34   34   * dcomplex cacosh(dcomplex z);
  35   35   *      cacosh z = +-i cacos z .
  36   36   * In order to make conj(cacosh(z))=cacosh(conj(z)),
  37   37   * we define
  38   38   *      cacosh z = sign(Im(z))*i cacos z .
  39   39   *
  40   40   */

  41   41  /* INDENT ON */
  42   42  
  43   43  #include "libm.h"       /* fabs/isnan/isinf/signbit */
  44   44  #include "complex_wrapper.h"
  45   45  
  46   46  /* need to work on special cases according to spec */
  47   47  
  48   48  dcomplex
  49   49  cacosh(dcomplex z) {
  50   50          dcomplex w, ans;
  51   51          double x, y;
  52   52  
  53   53          w = cacos(z);
  54   54          x = D_RE(z);
  55   55          y = D_IM(z);
  56   56          if (isnan(y)) {
  57   57                  D_IM(ans) = y + y;
  58   58                  if (isinf(x))
  59   59                          D_RE(ans) = fabs(x);
  60   60                  else
  61   61                          D_RE(ans) = y;
  62   62          } else if (signbit(y) == 0) {
  63   63                  D_RE(ans) = -D_IM(w);
  64   64                  D_IM(ans) = D_RE(w);
  65   65          } else {
  66   66                  D_RE(ans) = D_IM(w);
  67   67                  D_IM(ans) = -D_RE(w);
  68   68          }
  69   69          return (ans);
  70   70  }

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