1  /* Internal function for converting integers to ASCII.
       2     Copyright (C) 1994-2023 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, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _ITOWA_H
      20  #define _ITOWA_H	1
      21  #include <features.h>
      22  #include <wchar.h>
      23  #include <_itoa.h>
      24  
      25  /* Convert VALUE into ASCII in base BASE (2..36).
      26     Write backwards starting the character just before BUFLIM.
      27     Return the address of the first (left-to-right) character in the number.
      28     Use upper case letters iff UPPER_CASE is nonzero.  */
      29  
      30  extern wchar_t *_itowa (unsigned long long int value, wchar_t *buflim,
      31  			unsigned int base, int upper_case);
      32  
      33  static inline wchar_t *
      34  __attribute__ ((unused, always_inline))
      35  _itowa_word (_ITOA_WORD_TYPE value, wchar_t *buflim,
      36  	     unsigned int base, int upper_case)
      37  {
      38    extern const wchar_t _itowa_upper_digits[] attribute_hidden;
      39    extern const wchar_t _itowa_lower_digits[] attribute_hidden;
      40    const wchar_t *digits = (upper_case
      41  			   ? _itowa_upper_digits : _itowa_lower_digits);
      42    wchar_t *bp = buflim;
      43  
      44    switch (base)
      45      {
      46  #define SPECIAL(Base)							      \
      47      case Base:								      \
      48        do								      \
      49  	*--bp = digits[value % Base];					      \
      50        while ((value /= Base) != 0);					      \
      51        break
      52  
      53        SPECIAL (10);
      54        SPECIAL (16);
      55        SPECIAL (8);
      56      default:
      57        do
      58  	*--bp = digits[value % base];
      59        while ((value /= base) != 0);
      60      }
      61    return bp;
      62  }
      63  #undef SPECIAL
      64  
      65  #if !_ITOA_NEEDED
      66  /* No need for special long long versions.  */
      67  # define _itowa(value, buf, base, upper_case) \
      68    _itowa_word (value, buf, base, upper_case)
      69  #endif
      70  
      71  #endif	/* itowa.h */