/* Test istream formatted input.

Copyright 2001, 2002, 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */

#include <iostream>
#include <cstdlib>
#include <cstring>

#include "gmp.h"
#include "gmp-impl.h"
#include "tests.h"

using namespace std;


// Under option_check_standard, the various test cases for mpz operator>>
// are put through the standard operator>> for long, and likewise mpf
// operator>> is put through double.
//
// In g++ 3.3 this results in some printouts about the final position
// indicated for something like ".e123".  Our mpf code stops at the "e"
// since there's no mantissa digits, but g++ reads the whole thing and only
// then decides it's bad.

int   option_check_standard = 0;


// On some versions of g++ 2.96 it's been observed that putback() may leave
// tellg() unchanged.  We believe this is incorrect and presumably the
// result of a bug, since for instance it's ok in g++ 2.95 and g++ 3.3.  We
// detect the problem at runtime and disable affected checks.

int putback_tellg_works = 1;

void
check_putback_tellg (void)
{
  istringstream input ("hello");
  streampos  old_pos, new_pos;
  char  c;

  input.get(c);
  old_pos = input.tellg();
  input.putback(c);
  new_pos = input.tellg();

  if (old_pos == new_pos)
    {
      cout << "Warning, istringstream has a bug: putback() doesn't update tellg().\n";;
      cout << "Tests on tellg() will be skipped.\n";
      putback_tellg_works = 0;
    }
}


#define WRONG(str)                                              \
  do {                                                          \
    cout << str ", data[" << i << "]\n";                        \
    cout << "  input: \"" << data[i].input << "\"\n";           \
    cout << "  flags: " << hex << input.flags() << dec << "\n"; \
  } while (0)

void
check_mpz (void)
{
  static const struct {
    const char     *input;
    int            want_pos;
    const char     *want;
    ios::fmtflags  flags;

  } data[] = {

    { "0",      -1, "0",    (ios::fmtflags) 0 },
    { "123",    -1, "123",  (ios::fmtflags) 0 },
    { "0123",   -1, "83",   (ios::fmtflags) 0 },
    { "0x123",  -1, "291",  (ios::fmtflags) 0 },
    { "-123",   -1, "-123", (ios::fmtflags) 0 },
    { "-0123",  -1, "-83",  (ios::fmtflags) 0 },
    { "-0x123", -1, "-291", (ios::fmtflags) 0 },
    { "+123",   -1, "123", (ios::fmtflags) 0 },
    { "+0123",  -1, "83",  (ios::fmtflags) 0 },
    { "+0x123", -1, "291", (ios::fmtflags) 0 },

    { "0",     -1, "0",    ios::dec },
    { "1f",     1, "1",    ios::dec },
    { "011f",   3, "11",   ios::dec },
    { "123",   -1, "123",  ios::dec },
    { "-1f",    2, "-1",   ios::dec },
    { "-011f",  4, "-11",  ios::dec },
    { "-123",  -1, "-123", ios::dec },
    { "+1f",    2, "1",    ios::dec },
    { "+011f",  4, "11",   ios::dec },
    { "+123",  -1, "123",  ios::dec },

    { "0",    -1, "0",   ios::oct },
    { "123",  -1, "83",  ios::oct },
    { "-123", -1, "-83", ios::oct },
    { "+123", -1, "83",  ios::oct },

    { "0",    -1, "0",    ios::hex },
    { "123",  -1, "291",  ios::hex },
    { "ff",   -1, "255",  ios::hex },
    { "FF",   -1, "255",  ios::hex },
    { "-123", -1, "-291", ios::hex },
    { "-ff",  -1, "-255", ios::hex },
    { "-FF",  -1, "-255", ios::hex },
    { "+123", -1, "291",  ios::hex },
    { "+ff",  -1, "255",  ios::hex },
    { "+FF",  -1, "255",  ios::hex },
    { "ab",   -1, "171",  ios::hex },
    { "cd",   -1, "205",  ios::hex },
    { "ef",   -1, "239",  ios::hex },

    { " 123",  0, NULL,  (ios::fmtflags) 0 },   // not without skipws
    { " 123", -1, "123", ios::skipws },
  };

  mpz_t      got, want;
  int        got_ok, want_ok;
  long       got_si, want_si;
  streampos  init_tellg, got_pos, want_pos;

  mpz_init (got);
  mpz_init (want);

  for (size_t i = 0; i < numberof (data); i++)
    {
      want_pos = (data[i].want_pos == -1
                  ? strlen (data[i].input) : data[i].want_pos);

      want_ok = (data[i].want != NULL);

      if (data[i].want != NULL)
        mpz_set_str_or_abort (want, data[i].want, 0);
      else
        mpz_set_ui (want, 0L);

      if (option_check_standard && mpz_fits_slong_p (want))
        {
          istringstream  input (data[i].input);
          input.flags (data[i].flags);
          init_tellg = input.tellg();
          want_si = mpz_get_si (want);

          input >> got_si;
          got_ok = (input ? 1 : 0);
          input.clear();
          got_pos = input.tellg() - init_tellg;

          if (got_ok != want_ok)
            {
              WRONG ("stdc++ operator>> wrong status, check_mpz");
              cout << "  want_ok: " << want_ok << "\n";
              cout << "  got_ok:  " << got_ok << "\n";
            }
          if (want_ok && got_si != want_si)
            {
              WRONG ("stdc++ operator>> wrong result, check_mpz");
              cout << "  got_si:  " << got_si << "\n";
              cout << "  want_si: " << want_si << "\n";
            }
          if (putback_tellg_works && got_pos != want_pos)
            {
              WRONG ("stdc++ operator>> wrong position, check_mpz");
              cout << "  want_pos: " << want_pos << "\n";
              cout << "  got_pos:  " << got_pos << "\n";
            }
        }

      {
        istringstream  input (data[i].input);
        input.flags (data[i].flags);
        init_tellg = input.tellg();

        mpz_set_ui (got, 0xDEAD);
        input >> got;
        got_ok = (input ? 1 : 0);
        input.clear();
        got_pos = input.tellg() - init_tellg;

        if (got_ok != want_ok)
          {
            WRONG ("mpz operator>> wrong status");
            cout << "  want_ok: " << want_ok << "\n";
            cout << "  got_ok:  " << got_ok << "\n";
            abort ();
          }
        if (want_ok && mpz_cmp (got, want) != 0)
          {
            WRONG ("mpz operator>> wrong result");
            mpz_trace ("  got ", got);
            mpz_trace ("  want", want);
            abort ();
          }
        if (putback_tellg_works && got_pos != want_pos)
          {
            WRONG ("mpz operator>> wrong position");
            cout << "  want_pos: " << want_pos << "\n";
            cout << "  got_pos:  " << got_pos << "\n";
            abort ();
          }
      }
    }

  mpz_clear (got);
  mpz_clear (want);
}

void
check_mpq (void)
{
  static const struct {
    const char     *input;
    int            want_pos;
    const char     *want;
    ios::fmtflags  flags;

  } data[] = {

    { "0",   -1, "0", (ios::fmtflags) 0 },
    { "00",  -1, "0", (ios::fmtflags) 0 },
    { "0x0", -1, "0", (ios::fmtflags) 0 },

    { "123/456",   -1, "123/456", ios::dec },
    { "0123/456",  -1, "123/456", ios::dec },
    { "123/0456",  -1, "123/456", ios::dec },
    { "0123/0456", -1, "123/456", ios::dec },

    { "123/456",   -1, "83/302", ios::oct },
    { "0123/456",  -1, "83/302", ios::oct },
    { "123/0456",  -1, "83/302", ios::oct },
    { "0123/0456", -1, "83/302", ios::oct },

    { "ab",   -1, "171",  ios::hex },
    { "cd",   -1, "205",  ios::hex },
    { "ef",   -1, "239",  ios::hex },

    { "0/0",     -1, "0/0", (ios::fmtflags) 0 },
    { "5/8",     -1, "5/8", (ios::fmtflags) 0 },
    { "0x5/0x8", -1, "5/8", (ios::fmtflags) 0 },

    { "123/456",   -1, "123/456",  (ios::fmtflags) 0 },
    { "123/0456",  -1, "123/302",  (ios::fmtflags) 0 },
    { "123/0x456", -1, "123/1110", (ios::fmtflags) 0 },
    { "123/0X456", -1, "123/1110", (ios::fmtflags) 0 },

    { "0123/123",   -1, "83/123", (ios::fmtflags) 0 },
    { "0123/0123",  -1, "83/83",  (ios::fmtflags) 0 },
    { "0123/0x123", -1, "83/291", (ios::fmtflags) 0 },
    { "0123/0X123", -1, "83/291", (ios::fmtflags) 0 },

    { "0x123/123",   -1, "291/123", (ios::fmtflags) 0 },
    { "0X123/0123",  -1, "291/83",  (ios::fmtflags) 0 },
    { "0x123/0x123", -1, "291/291", (ios::fmtflags) 0 },

    { " 123",  0, NULL,  (ios::fmtflags) 0 },   // not without skipws
    { " 123", -1, "123", ios::skipws },
  };

  mpq_t      got, want;
  int        got_ok, want_ok;
  long       got_si, want_si;
  streampos  init_tellg, got_pos, want_pos;

  mpq_init (got);
  mpq_init (want);

  for (size_t i = 0; i < numberof (data); i++)
    {
      want_pos = (data[i].want_pos == -1
                  ? strlen (data[i].input) : data[i].want_pos);

      want_ok = (data[i].want != NULL);

      if (data[i].want != NULL)
        mpq_set_str_or_abort (want, data[i].want, 0);
      else
        mpq_set_ui (want, 0L, 1L);

      if (option_check_standard
          && mpz_fits_slong_p (mpq_numref(want))
          && mpz_cmp_ui (mpq_denref(want), 1L) == 0)
        {
          istringstream  input (data[i].input);
          input.flags (data[i].flags);
          init_tellg = input.tellg();
          want_si = mpz_get_si (mpq_numref(want));

          input >> got_si;
          got_ok = (input ? 1 : 0);
          input.clear();
          got_pos = input.tellg() - init_tellg;

          if (got_ok != want_ok)
            {
              WRONG ("stdc++ operator>> wrong status, check_mpq");
              cout << "  want_ok: " << want_ok << "\n";
              cout << "  got_ok:  " << got_ok << "\n";
            }
          if (want_ok && want_si != got_si)
            {
              WRONG ("stdc++ operator>> wrong result, check_mpq");
              cout << "  got_si:  " << got_si << "\n";
              cout << "  want_si: " << want_si << "\n";
            }
          if (putback_tellg_works && got_pos != want_pos)
            {
              WRONG ("stdc++ operator>> wrong position, check_mpq");
              cout << "  want_pos: " << want_pos << "\n";
              cout << "  got_pos:  " << got_pos << "\n";
            }
        }

      {
        istringstream  input (data[i].input);
        input.flags (data[i].flags);
        init_tellg = input.tellg();
        mpq_set_si (got, 0xDEAD, 0xBEEF);

        input >> got;
        got_ok = (input ? 1 : 0);
        input.clear();
        got_pos = input.tellg() - init_tellg;

        if (got_ok != want_ok)
          {
            WRONG ("mpq operator>> wrong status");
            cout << "  want_ok: " << want_ok << "\n";
            cout << "  got_ok:  " << got_ok << "\n";
            abort ();
          }
        // don't use mpq_equal, since we allow non-normalized values to be
        // read, which can trigger ASSERTs in mpq_equal
        if (want_ok && (mpz_cmp (mpq_numref (got), mpq_numref(want)) != 0
                        || mpz_cmp (mpq_denref (got), mpq_denref(want)) != 0))
          {
            WRONG ("mpq operator>> wrong result");
            mpq_trace ("  got ", got);
            mpq_trace ("  want", want);
            abort ();
          }
        if (putback_tellg_works && got_pos != want_pos)
          {
            WRONG ("mpq operator>> wrong position");
            cout << "  want_pos: " << want_pos << "\n";
            cout << "  got_pos:  " << got_pos << "\n";
            abort ();
          }
      }
    }

  mpq_clear (got);
  mpq_clear (want);
}


void
check_mpf (void)
{
  static const struct {
    const char     *input;
    int            want_pos;
    const char     *want;
    ios::fmtflags  flags;

  } data[] = {

    { "0",      -1, "0", (ios::fmtflags) 0 },
    { "+0",     -1, "0", (ios::fmtflags) 0 },
    { "-0",     -1, "0", (ios::fmtflags) 0 },
    { "0.0",    -1, "0", (ios::fmtflags) 0 },
    { "0.",     -1, "0", (ios::fmtflags) 0 },
    { ".0",     -1, "0", (ios::fmtflags) 0 },
    { "+.0",    -1, "0", (ios::fmtflags) 0 },
    { "-.0",    -1, "0", (ios::fmtflags) 0 },
    { "+0.00",  -1, "0", (ios::fmtflags) 0 },
    { "-0.000", -1, "0", (ios::fmtflags) 0 },
    { "+0.00",  -1, "0", (ios::fmtflags) 0 },
    { "-0.000", -1, "0", (ios::fmtflags) 0 },
    { "0.0e0",  -1, "0", (ios::fmtflags) 0 },
    { "0.e0",   -1, "0", (ios::fmtflags) 0 },
    { ".0e0",   -1, "0", (ios::fmtflags) 0 },
    { "0.0e-0", -1, "0", (ios::fmtflags) 0 },
    { "0.e-0",  -1, "0", (ios::fmtflags) 0 },
    { ".0e-0",  -1, "0", (ios::fmtflags) 0 },
    { "0.0e+0", -1, "0", (ios::fmtflags) 0 },
    { "0.e+0",  -1, "0", (ios::fmtflags) 0 },
    { ".0e+0",  -1, "0", (ios::fmtflags) 0 },

    { "1",  -1,  "1", (ios::fmtflags) 0 },
    { "+1", -1,  "1", (ios::fmtflags) 0 },
    { "-1", -1, "-1", (ios::fmtflags) 0 },

    { " 0",  0,  NULL, (ios::fmtflags) 0 },  // not without skipws
    { " 0",  -1, "0", ios::skipws },
    { " +0", -1, "0", ios::skipws },
    { " -0", -1, "0", ios::skipws },

    { "+-123", 1, NULL, (ios::fmtflags) 0 },
    { "-+123", 1, NULL, (ios::fmtflags) 0 },
    { "1e+-123", 3, NULL, (ios::fmtflags) 0 },
    { "1e-+123", 3, NULL, (ios::fmtflags) 0 },

    { "e123",   0, NULL, (ios::fmtflags) 0 }, // at least one mantissa digit
    { ".e123",  1, NULL, (ios::fmtflags) 0 },
    { "+.e123", 2, NULL, (ios::fmtflags) 0 },
    { "-.e123", 2, NULL, (ios::fmtflags) 0 },

    { "123e",   4, NULL, (ios::fmtflags) 0 }, // at least one exponent digit
    { "123e-",  5, NULL, (ios::fmtflags) 0 },
    { "123e+",  5, NULL, (ios::fmtflags) 0 },
  };

  mpf_t      got, want;
  int        got_ok, want_ok;
  double     got_d, want_d;
  streampos  init_tellg, got_pos, want_pos;

  mpf_init (got);
  mpf_init (want);

  for (size_t i = 0; i < numberof (data); i++)
    {
      want_pos = (data[i].want_pos == -1
                  ? strlen (data[i].input) : data[i].want_pos);

      want_ok = (data[i].want != NULL);

      if (data[i].want != NULL)
        mpf_set_str_or_abort (want, data[i].want, 0);
      else
        mpf_set_ui (want, 0L);

      want_d = mpf_get_d (want);
      if (option_check_standard && mpf_cmp_d (want, want_d) == 0)
        {
          istringstream  input (data[i].input);
          input.flags (data[i].flags);
          init_tellg = input.tellg();

          input >> got_d;
          got_ok = (input ? 1 : 0);
          input.clear();
          got_pos = input.tellg() - init_tellg;

          if (got_ok != want_ok)
            {
              WRONG ("stdc++ operator>> wrong status, check_mpf");
              cout << "  want_ok: " << want_ok << "\n";
              cout << "  got_ok:  " << got_ok << "\n";
            }
          if (want_ok && want_d != got_d)
            {
              WRONG ("stdc++ operator>> wrong result, check_mpf");
              cout << "  got:   " << got_d << "\n";
              cout << "  want:  " << want_d << "\n";
            }
          if (putback_tellg_works && got_pos != want_pos)
            {
              WRONG ("stdc++ operator>> wrong position, check_mpf");
              cout << "  want_pos: " << want_pos << "\n";
              cout << "  got_pos:  " << got_pos << "\n";
            }
        }

      {
        istringstream  input (data[i].input);
        input.flags (data[i].flags);
        init_tellg = input.tellg();

        mpf_set_ui (got, 0xDEAD);
        input >> got;
        got_ok = (input ? 1 : 0);
        input.clear();
        got_pos = input.tellg() - init_tellg;

        if (got_ok != want_ok)
          {
            WRONG ("mpf operator>> wrong status");
            cout << "  want_ok: " << want_ok << "\n";
            cout << "  got_ok:  " << got_ok << "\n";
            abort ();
          }
        if (want_ok && mpf_cmp (got, want) != 0)
          {
            WRONG ("mpf operator>> wrong result");
            mpf_trace ("  got ", got);
            mpf_trace ("  want", want);
            abort ();
          }
        if (putback_tellg_works && got_pos != want_pos)
          {
            WRONG ("mpf operator>> wrong position");
            cout << "  want_pos: " << want_pos << "\n";
            cout << "  got_pos:  " << got_pos << "\n";
            abort ();
          }
      }
    }

  mpf_clear (got);
  mpf_clear (want);
}



int
main (int argc, char *argv[])
{
  if (argc > 1 && strcmp (argv[1], "-s") == 0)
    option_check_standard = 1;

  tests_start ();

  check_putback_tellg ();
  check_mpz ();
  check_mpq ();
  check_mpf ();

  tests_end ();
  return 0;
}
