glibc/stdio-common/_itoa.h

/* Internal function for converting integers to ASCII.
   Copyright (C) 1994, 95, 96, 97, 98, 99 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _ITOA_H
#define _ITOA_H
#include <sys/cdefs.h>

/* 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);

static inline char * __attribute__ ((unused))
_itoa_word (unsigned long value, char *buflim,
	    unsigned int base, int upper_case)
{
  extern const char _itoa_upper_digits[], _itoa_lower_digits[];
  const char *digits = upper_case ? _itoa_upper_digits : _itoa_lower_digits;
  char *bp = buflim;

  switch (base)
    {
#define SPECIAL(Base)							      \
    case Base:								      \
      do								      \
	*--bp = digits[value % Base];					      \
      while ((value /= Base) != 0);					      \
      break

      SPECIAL (10);
      SPECIAL (16);
      SPECIAL (8);
    default:
      do
	*--bp = digits[value % base];
      while ((value /= base) != 0);
    }
  return bp;
}

static inline char * __attribute__ ((unused))
_fitoa_word (unsigned long value, char *buf, unsigned int base, int upper_case)
{
  char tmpbuf[sizeof (value) * 4];		/* Worst case length: base 2.  */
  char *cp = _itoa_word (value, tmpbuf + sizeof (value) * 4, base, upper_case);
  while (cp < tmpbuf + sizeof (value) * 4)
    *buf++ = *cp++;
  return buf;
}

static inline char * __attribute__ ((unused))
_fitoa (unsigned long long value, char *buf, unsigned int base, int upper_case)
{
  char tmpbuf[sizeof (value) * 4];		/* Worst case length: base 2.  */
  char *cp = _itoa (value, tmpbuf + sizeof (value) * 4, base, upper_case);
  while (cp < tmpbuf + sizeof (value) * 4)
    *buf++ = *cp++;
  return buf;
}

#endif	/* itoa.h */