contrib/gmp/mpz/cmp.c

   1 /* mpz_cmp(u,v) -- Compare U, V.  Return positive, zero, or negative
   2    based on if U > V, U == V, or U < V.
   3
   4 Copyright 1991, 1993, 1994, 1996, 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 #ifdef BERKELEY_MP
  22 #include "mp.h"
  23 #endif
  24 #include "gmp.h"
  25 #include "gmp-impl.h"
  26
  27 int
  28 #ifdef BERKELEY_MP
  29 mcmp (mpz_srcptr u, mpz_srcptr v)
  30 #else
  31 mpz_cmp (mpz_srcptr u, mpz_srcptr v) __GMP_NOTHROW
  32 #endif
  33 {
  34   mp_size_t  usize, vsize, dsize, asize;
  35   mp_srcptr  up, vp;
  36   int        cmp;
  37
  38   usize = SIZ(u);
  39   vsize = SIZ(v);
  40   dsize = usize - vsize;
  41   if (dsize != 0)
  42     return dsize;
  43
  44   asize = ABS (usize);
  45   up = PTR(u);
  46   vp = PTR(v);
  47   MPN_CMP (cmp, up, vp, asize);
  48   return (usize >= 0 ? cmp : -cmp);
  49 }