/* Test file for mpfr_set_str.

Copyright (C) 1999 PolKA project, Inria Lorraine and Loria

This file is part of the MPFR Library.

The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.

The MPFR 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 Library General Public
License for more details.

You should have received a copy of the GNU Library General Public License
along with the MPFR 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 "mpfr.h"
#include <time.h>

#if defined (hpux)
#define srandom srand48
#define random mrand48
#endif

int
main(int argc, char **argv)
{
  mpfr_t x, y; unsigned long k, bd, nc, i; char *str, *str2; mp_exp_t e;
  int base, logbase, prec, baseprec;

  if (argc==2) { /* tset_str <string> */
    mpfr_init2(x, 53);
    mpfr_set_str_raw(x, argv[1]);
    printf("%1.20e\n", mpfr_get_d(x));
    mpfr_clear(x);
    return 0;
  }

  srandom(time(NULL)); 
  
  if (argc > 1) { nc = atoi(argv[1]); } else { nc = 53; }
  if (nc < 100) { nc = 100; }

  bd = random()&8;
  
  str2 = str = (char *) malloc (nc*sizeof(char)); 

  if (bd) 
    {
      for(k = 1; k <= bd; k++) 
	{ *(str2++) = (random() & 1) + '0'; }
    }
  else { *(str2++) = '0'; }

  *(str2++) = '.'; 

  for(k = 1; k < nc - 17 - bd; k++)
    {
      *(str2++) = '0' + (random() & 1); 
    }

  *(str2++) = 'e'; 
  sprintf(str2, "%d", random() - (1 << 30)); 

  mpfr_init2(x, nc + 10); 
  mpfr_set_str_raw(x, str);

  mpfr_set_prec(x, 54);
  mpfr_set_str_raw(x, "0.100100100110110101001010010101111000001011100100101010E-529");
  mpfr_init2(y, 54);
  mpfr_set_str(y, "4.936a52bc17254@-133", 16, GMP_RNDN);
  if (mpfr_cmp(x, y)) {
    fprintf(stderr, "Error in mpfr_set_str\n");
    mpfr_print_raw(x); putchar('\n');
    mpfr_print_raw(y); putchar('\n');
    mpfr_clear(x); mpfr_clear(y); 
    exit(1);
  }

  free(str); 

  mpfr_set_prec(x, 53);
  mpfr_set_str_raw(x, "+110101100.01010000101101000000100111001000101011101110E00");

  mpfr_set_str_raw(x, "1.0");
  if (mpfr_get_d(x) != 1.0) {
    fprintf(stderr, "Error in mpfr_set_str_raw for s=1.0\n"); 
    mpfr_clear(x); mpfr_clear(y); 
    exit(1);
  }

  mpfr_set_str(x, "+243495834958.53452345E1", 10, GMP_RNDN);
  mpfr_set_str(x, "9007199254740993", 10, GMP_RNDN);
  mpfr_set_str(x, "9007199254740992", 10, GMP_RNDU);
  mpfr_set_str(x, "9007199254740992", 10, GMP_RNDD);
  mpfr_set_str(x, "9007199254740992", 10, GMP_RNDZ);

  /* check a random number printed and read is not modified */
  prec = 53;
  mpfr_set_prec(x, prec);
  mpfr_set_prec(y, prec);
  for (i=0;i<100000;i++) {
    mpfr_random(x);
    k = rand() % 4;
    logbase = (rand() % 5) + 1;
    base = 1 << logbase;
    /* Warning: the number of bits needed to print exactly a number of 
       'prec' bits in base 2^logbase may be greater than ceil(prec/logbase),
       for example 0.11E-1 in base 2 cannot be written exactly with only
       one digit in base 4 */
    if (base==2) baseprec=prec;
    else baseprec=1+(prec-2+logbase)/logbase;
    str = mpfr_get_str(NULL, &e, base, baseprec, x, k);
    mpfr_set_str(y, str, base, k);
    MPFR_EXP(y) += logbase*(e-strlen(str));
    if (mpfr_cmp(x, y)) {
      fprintf(stderr, "mpfr_set_str o mpfr_get_str <> id for rnd_mode=%s\n",
	      mpfr_print_rnd_mode(k));
      printf("x="); mpfr_print_raw(x); putchar('\n');
      printf("s=%s, exp=%d, base=%d\n", str, (int) e, base);
      printf("y="); mpfr_print_raw(y); putchar('\n');
      mpfr_clear(x); mpfr_clear(y); 
      exit(1);
    }
    free(str); 
  }

  mpfr_clear(x); mpfr_clear(y);
  return 0; 
}