////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2022 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_lo_utils_h)
#define octave_lo_utils_h 1

#include "octave-config.h"

#include <cstdio>

#include <iosfwd>
#include <string>

#include "oct-cmplx.h"
#include "quit.h"

OCTAVE_BEGIN_NAMESPACE(octave)

  // Generic any/all test functionality with arbitrary predicate.

  template <typename F, typename T, bool zero>
  bool
  any_all_test (F fcn, const T *m, octave_idx_type len)
  {
    octave_idx_type i;

    for (i = 0; i < len - 3; i += 4)
      {
        octave_quit ();

        if (fcn (m[i]) != zero
            || fcn (m[i+1]) != zero
            || fcn (m[i+2]) != zero
            || fcn (m[i+3]) != zero)
          return ! zero;
      }

    octave_quit ();

    for (; i < len; i++)
      if (fcn (m[i]) != zero)
        return ! zero;

    return zero;
  }

  extern OCTAVE_API bool xis_int_or_inf_or_nan (double x);

  template <typename T>
  bool is_one_or_zero (const T& x)
  {
    return x == T (0) || x == T (1);
  }

  template <typename T>
  bool is_zero (const T& x)
  {
    return x == T (0);
  }

  extern OCTAVE_API bool too_large_for_float (double x);

  extern OCTAVE_API bool too_large_for_float (const Complex&  x);

  extern OCTAVE_API bool is_int_or_inf_or_nan (float x);
  extern OCTAVE_API bool too_large_for_float (float x);

  extern OCTAVE_API char * strsave (const char *);

  extern OCTAVE_API std::string fgets (std::FILE *);
  extern OCTAVE_API std::string fgetl (std::FILE *);

  extern OCTAVE_API std::string fgets (std::FILE *, bool& eof);
  extern OCTAVE_API std::string fgetl (std::FILE *, bool& eof);

  template <typename T> OCTAVE_API T read_value (std::istream& is);

  template <> OCTAVE_API double read_value (std::istream& is);
  template <> OCTAVE_API Complex read_value (std::istream& is);
  template <> OCTAVE_API float read_value (std::istream& is);
  template <> OCTAVE_API FloatComplex read_value (std::istream& is);

  template <typename T> OCTAVE_API void write_value (std::ostream& os, const T& value);

  template <> OCTAVE_API void write_value (std::ostream& os, const double& value);
  template <> OCTAVE_API void write_value (std::ostream& os, const Complex& value);
  template <> OCTAVE_API void write_value (std::ostream& os, const float& value);
  template <> OCTAVE_API void write_value (std::ostream& os, const FloatComplex& value);

OCTAVE_BEGIN_NAMESPACE(math)

    extern OCTAVE_API bool int_multiply_overflow (int a, int b, int *r);

    extern OCTAVE_API bool
    int_multiply_overflow (long int a, long int b, long int *r);

#if defined (OCTAVE_HAVE_LONG_LONG_INT)
    extern OCTAVE_API bool
    int_multiply_overflow (long long int a, long long int b, long long int *r);
#endif

    extern OCTAVE_API bool
    int_multiply_overflow (unsigned int a, unsigned int b, unsigned int *r);

    extern OCTAVE_API bool
    int_multiply_overflow (unsigned long int a, unsigned long int b,
                           unsigned long int *r);

#if defined (OCTAVE_HAVE_UNSIGNED_LONG_LONG_INT)
    extern OCTAVE_API bool
    int_multiply_overflow (unsigned long long int a, unsigned long long int b,
                           unsigned long long int *r);
#endif

OCTAVE_END_NAMESPACE(math)
OCTAVE_END_NAMESPACE(octave)

#endif