contrib/gmp/mpf/int_p.c

   1 /* mpf_integer_p -- test whether an mpf is an integer */
   2
   3 /*
   4 Copyright 2001, 2002 Free Software Foundation, Inc.
   5
   6 This file is part of the GNU MP Library.
   7
   8 The GNU MP 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 3 of the License, or (at your
  11 option) any later version.
  12
  13 The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */
  20
  21 #include "gmp.h"
  22 #include "gmp-impl.h"
  23
  24
  25 int
  26 mpf_integer_p (mpf_srcptr f) __GMP_NOTHROW
  27 {
  28   mp_srcptr ptr;
  29   mp_exp_t exp;
  30   mp_size_t size, frac, i;
  31
  32   size = SIZ (f);
  33   if (size == 0)
  34     return 1;  /* zero is an integer */
  35
  36   exp = EXP (f);
  37   if (exp <= 0)
  38     return 0;  /* has only fraction limbs */
  39
  40   /* any fraction limbs must be zero */
  41   frac = ABS (size) - exp;
  42   ptr = PTR (f);
  43   for (i = 0; i < frac; i++)
  44     if (ptr[i] != 0)
  45       return 0;
  46
  47   return 1;
  48 }