t-cmp.c

a very popular packet of cryptography tools,it encloses the most common used algorithm and protocols

/* Test mpz_cmp and mpz_cmpabs.

Copyright 2001 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "tests.h"


/* Nothing sophisticated here, just exercise some combinations of sizes and
   signs.  */


void
check_one (mpz_ptr x, mpz_ptr y, int want_cmp, int want_cmpabs)
{
  int  got;

  got = mpz_cmp (x, y);
  if ((   got <  0) != (want_cmp <  0)
      || (got == 0) != (want_cmp == 0)
      || (got >  0) != (want_cmp >  0))
    {
      printf ("mpz_cmp got %d want %d\n", got, want_cmp);
      mpz_trace ("x", x);
      mpz_trace ("y", y);
      abort ();
    }

  got = mpz_cmpabs (x, y);
  if ((   got <  0) != (want_cmpabs <  0)
      || (got == 0) != (want_cmpabs == 0)
      || (got >  0) != (want_cmpabs >  0))
    {
      printf ("mpz_cmpabs got %d want %d\n", got, want_cmpabs);
      mpz_trace ("x", x);
      mpz_trace ("y", y);
      abort ();
    }
}


void
check_all (mpz_ptr x, mpz_ptr y, int want_cmp, int want_cmpabs)
{
  check_one (x, y,  want_cmp,  want_cmpabs);
  check_one (y, x, -want_cmp, -want_cmpabs);

  mpz_neg (x, x);
  mpz_neg (y, y);
  want_cmp = -want_cmp;

  check_one (x, y,  want_cmp,  want_cmpabs);
  check_one (y, x, -want_cmp, -want_cmpabs);
}


#define SET1(z,size, n) \
  SIZ(z) = size; PTR(z)[0] = n

#define SET2(z,size, n1,n0) \
  SIZ(z) = size; PTR(z)[1] = n1; PTR(z)[0] = n0

#define SET4(z,size, n3,n2,n1,n0) \
  SIZ(z) = size; PTR(z)[3] = n3; PTR(z)[2] = n2; PTR(z)[1] = n1; PTR(z)[0] = n0

void
check_various (void)
{
  mpz_t  x, y;

  mpz_init (x);
  mpz_init (y);

  mpz_realloc (x, (mp_size_t) 20);
  mpz_realloc (y, (mp_size_t) 20);

  /* 0 cmp 0, junk in low limbs */
  SET1 (x,0, 123);
  SET1 (y,0, 456);
  check_all (x, y, 0, 0);


  /* 123 cmp 0 */
  SET1 (x,1, 123);
  SET1 (y,0, 456);
  check_all (x, y, 1, 1);

  /* 123:456 cmp 0 */
  SET2 (x,2, 456,123);
  SET1 (y,0, 9999);
  check_all (x, y, 1, 1);


  /* 123 cmp 123 */
  SET1(x,1, 123);
  SET1(y,1, 123);
  check_all (x, y, 0, 0);

  /* -123 cmp 123 */
  SET1(x,-1, 123);
  SET1(y,1,  123);
  check_all (x, y, -1, 0);


  /* 123 cmp 456 */
  SET1(x,1, 123);
  SET1(y,1, 456);
  check_all (x, y, -1, -1);

  /* -123 cmp 456 */
  SET1(x,-1, 123);
  SET1(y,1,  456);
  check_all (x, y, -1, -1);

  /* 123 cmp -456 */
  SET1(x,1,  123);
  SET1(y,-1, 456);
  check_all (x, y, 1, -1);


  /* 1:0 cmp 1:0 */
  SET2 (x,2, 1,0);
  SET2 (y,2, 1,0);
  check_all (x, y, 0, 0);

  /* -1:0 cmp 1:0 */
  SET2 (x,-2, 1,0);
  SET2 (y,2,  1,0);
  check_all (x, y, -1, 0);


  /* 2:0 cmp 1:0 */
  SET2 (x,2, 2,0);
  SET2 (y,2, 1,0);
  check_all (x, y, 1, 1);


  /* 4:3:2:1 cmp 2:1 */
  SET4 (x,4, 4,3,2,1);
  SET2 (y,2, 2,1);
  check_all (x, y, 1, 1);

  /* -4:3:2:1 cmp 2:1 */
  SET4 (x,-4, 4,3,2,1);
  SET2 (y,2,  2,1);
  check_all (x, y, -1, 1);


  mpz_clear (x);
  mpz_clear (y);
}


int
main (void)
{
  tests_start ();
  mp_trace_base = -16;

  check_various ();

  tests_end ();
  exit (0);
}