/*
  Copyright (c) 2014 Arduino LLC.  All right reserved.

  This 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.

  This 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 this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include <string.h>

#ifdef __cplusplus
extern "C" {
#endif

char* ltoa( long value, char *string, int radix )
{
  char tmp[33];
  char *tp = tmp;
  long i;
  unsigned long v;
  int sign;
  char *sp;

  if ( string == NULL )
  {
    return 0 ;
  }

  if (radix > 36 || radix <= 1)
  {
    return 0 ;
  }

  sign = (radix == 10 && value < 0);
  if (sign)
  {
    v = -value;
  }
  else
  {
    v = (unsigned long)value;
  }

  while (v || tp == tmp)
  {
    i = v % radix;
    v = v / radix;
    if (i < 10)
      *tp++ = i+'0';
    else
      *tp++ = i + 'a' - 10;
  }

  sp = string;

  if (sign)
    *sp++ = '-';
  while (tp > tmp)
    *sp++ = *--tp;
  *sp = 0;

  return string;
}

char* ultoa( unsigned long value, char *string, int radix )
{
  char tmp[33];
  char *tp = tmp;
  long i;
  unsigned long v = value;
  char *sp;

  if ( string == NULL )
  {
    return 0;
  }

  if (radix > 36 || radix <= 1)
  {
    return 0;
  }

  while (v || tp == tmp)
  {
    i = v % radix;
    v = v / radix;
    if (i < 10)
      *tp++ = i+'0';
    else
      *tp++ = i + 'a' - 10;
  }

  sp = string;


  while (tp > tmp)
    *sp++ = *--tp;
  *sp = 0;

  return string;
}

char* itoa( int value, char *string, int radix )
{
  return ltoa( value, string, radix ) ;
}

char* utoa( unsigned int value, char *string, int radix )
{
  return ultoa( value, string, radix ) ;
}

#ifdef __cplusplus
} // extern "C"
#endif
