1  /* Internal function for converting integers to ASCII.
       2     Copyright (C) 1994-1999,2002,2003,2007 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, write to the Free
      17     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
      18     02111-1307 USA.  */
      19  
      20  #ifndef _ITOA_H
      21  #define _ITOA_H
      22  
      23  /* Convert VALUE into ASCII in base BASE (2..16).
      24     Write backwards starting the character just before BUFLIM.
      25     Return the address of the first (left-to-right) character in the number.
      26     Use upper case letters iff UPPER_CASE is nonzero.  */
      27  
      28  static const char _itoa_lower_digits[16] = "0123456789abcdef";
      29  static const char _itoa_upper_digits[16] = "0123456789ABCDEF";
      30  
      31  static inline char * __attribute__ ((unused, always_inline))
      32  _itoa_word (unsigned long value, char *buflim,
      33  	    unsigned int base, int upper_case)
      34  {
      35    const char *digits = (upper_case ? _itoa_upper_digits : _itoa_lower_digits);
      36  
      37    switch (base)
      38      {
      39  # define SPECIAL(Base)							      \
      40      case Base:								      \
      41        do								      \
      42  	*--buflim = digits[value % Base];				      \
      43        while ((value /= Base) != 0);					      \
      44        break
      45  
      46        SPECIAL (10);
      47        SPECIAL (16);
      48        SPECIAL (8);
      49      default:
      50        do
      51  	*--buflim = digits[value % base];
      52        while ((value /= base) != 0);
      53      }
      54    return buflim;
      55  }
      56  
      57  static inline char * __attribute__ ((unused, always_inline))
      58  _itoa (uint64_t value, char *buflim,
      59         unsigned int base, int upper_case)
      60  {
      61    const char *digits = (upper_case ? _itoa_upper_digits : _itoa_lower_digits);
      62  
      63    switch (base)
      64      {
      65        SPECIAL (10);
      66        SPECIAL (16);
      67        SPECIAL (8);
      68      default:
      69        do
      70  	*--buflim = digits[value % base];
      71        while ((value /= base) != 0);
      72      }
      73    return buflim;
      74  }
      75  # undef SPECIAL
      76  
      77  #endif	/* itoa.h */