/* Internal function for converting integers to ASCII.

   Copyright (C) 1994-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 C 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 C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _ITOA_H

#define _ITOA_H

#include <limits.h>

/* When long long is different from long, by default, _itoa_word is

   provided to convert long to ASCII and _itoa is provided to convert

   long long.  A sysdeps _itoa.h can define _ITOA_NEEDED to 0 and define

   _ITOA_WORD_TYPE to unsigned long long int to override it so that

   _itoa_word is changed to convert long long to ASCII and _itoa is

   mapped to _itoa_word.  */

#ifndef _ITOA_NEEDED

# define _ITOA_NEEDED		(LONG_MAX != LLONG_MAX)

#endif

#ifndef _ITOA_WORD_TYPE

# define _ITOA_WORD_TYPE	unsigned long int

#endif

/* Convert VALUE into ASCII in base BASE (2..36).

   Write backwards starting the character just before BUFLIM.

   Return the address of the first (left-to-right) character in the number.

   Use upper case letters iff UPPER_CASE is nonzero.  */

extern char *_itoa (unsigned long long int value, char *buflim,

		    unsigned int base, int upper_case) attribute_hidden;

extern const char _itoa_upper_digits[];

extern const char _itoa_lower_digits[];

#if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)

hidden_proto (_itoa_upper_digits)

hidden_proto (_itoa_lower_digits)

#endif

#if IS_IN (libc)

extern char *_itoa_word (_ITOA_WORD_TYPE value, char *buflim,

			 unsigned int base,

			 int upper_case) attribute_hidden;

#else

static inline char * __attribute__ ((unused, always_inline))

_itoa_word (_ITOA_WORD_TYPE value, char *buflim,

	    unsigned int base, int upper_case)

{

  const char *digits = (upper_case

			? _itoa_upper_digits

			: _itoa_lower_digits);

  switch (base)

    {

# define SPECIAL(Base)							      \

    case Base:								      \

      do								      \

	*--buflim = digits[value % Base];				      \

      while ((value /= Base) != 0);					      \

      break

      SPECIAL (10);

      SPECIAL (16);

      SPECIAL (8);

    default:

      do

	*--buflim = digits[value % base];

      while ((value /= base) != 0);

    }

  return buflim;

}

# undef SPECIAL

#endif

/* Similar to the _itoa functions, but output starts at buf and pointer

   after the last written character is returned.  */

extern char *_fitoa_word (_ITOA_WORD_TYPE value, char *buf,

			  unsigned int base,

			  int upper_case) attribute_hidden;

extern char *_fitoa (unsigned long long value, char *buf, unsigned int base,

		     int upper_case) attribute_hidden;

#if !_ITOA_NEEDED

/* No need for special long long versions.  */

# define _itoa(value, buf, base, upper_case) \

  _itoa_word (value, buf, base, upper_case)

# define _fitoa(value, buf, base, upper_case) \

  _fitoa_word (value, buf, base, upper_case)

#endif

#endif	/* itoa.h */