contrib/mpfr/set_sj.c

   1 /* mpfr_set_sj -- set a MPFR number from a huge machine signed integer
   2
   3 Copyright 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   4 Contributed by the Arenaire and Cacao projects, INRIA.
   5
   6 This file is part of the GNU MPFR Library.
   7
   8 The GNU MPFR Library is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU Lesser General Public License as published by
  10 the Free Software Foundation; either version 2.1 of the License, or (at your
  11 option) any later version.
  12
  13 The GNU MPFR Library is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  16 License for more details.
  17
  18 You should have received a copy of the GNU Lesser General Public License
  19 along with the GNU MPFR Library; see the file COPYING.LIB.  If not, write to
  20 the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  21 MA 02110-1301, USA. */
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include "config.h"       /* for a build within gmp */
  25 #endif
  26
  27 /* The ISO C99 standard specifies that in C++ implementations the
  28    INTMAX_MAX, ... macros should only be defined if explicitly requested.  */
  29 #if defined __cplusplus
  30 # define __STDC_LIMIT_MACROS
  31 # define __STDC_CONSTANT_MACROS
  32 #endif
  33
  34 #if HAVE_INTTYPES_H
  35 # include <inttypes.h> /* for intmax_t */
  36 #else
  37 # if HAVE_STDINT_H
  38 #  include <stdint.h>
  39 # endif
  40 #endif
  41
  42 #include "mpfr-impl.h"
  43
  44 #ifdef _MPFR_H_HAVE_INTMAX_T
  45
  46 int
  47 mpfr_set_sj (mpfr_t x, intmax_t j, mp_rnd_t rnd)
  48 {
  49   return mpfr_set_sj_2exp (x, j, 0, rnd);
  50 }
  51
  52 int
  53 mpfr_set_sj_2exp (mpfr_t x, intmax_t j, intmax_t e, mp_rnd_t rnd)
  54 {
  55   if (j>=0)
  56     return mpfr_set_uj_2exp (x, j, e, rnd);
  57   else
  58     {
  59       int inex;
  60       inex = mpfr_set_uj_2exp (x, - (uintmax_t) j, e, MPFR_INVERT_RND (rnd));
  61       MPFR_CHANGE_SIGN (x);
  62       return -inex;
  63     }
  64 }
  65
  66 #endif