stdio/_itoa.h

   1 /* Internal function for converting integers to ASCII.
   2 Copyright (C) 1994, 1995 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 Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #ifndef _ITOA_H
  21 #define _ITOA_H
  22 #include <sys/cdefs.h>
  23
  24 extern const char _itoa_lower_digits[], _itoa_upper_digits[];
  25
  26 /* Convert VALUE into ASCII in base BASE (2..36).
  27    Write backwards starting the character just before BUFLIM.
  28    Return the address of the first (left-to-right) character in the number.
  29    Use upper case letters iff UPPER_CASE is nonzero.  */
  30
  31 extern char *_itoa __P ((unsigned long long int value, char *buflim,
  32                          unsigned int base, int upper_case));
  33
  34 #ifndef _EXTERN_INLINE
  35 #define _EXTERN_INLINE extern __inline
  36 #endif
  37
  38 _EXTERN_INLINE
  39 char *
  40 _itoa (unsigned long long int value, char *buflim,
  41        unsigned int base, int upper_case)
  42 {
  43   /* Base-36 digits for numbers.  */
  44   const char *digits = upper_case ? _itoa_upper_digits : _itoa_lower_digits;
  45
  46   register char *bp = buflim;
  47
  48   while (value > 0)
  49     {
  50       *--bp = digits[value % base];
  51       value /= base;
  52     }
  53
  54   return bp;
  55 }
  56
  57
  58 #endif  /* itoa.h */