stdio-common/_itoa.h

   1 /* Internal function for converting integers to ASCII.
   2 Copyright (C) 1994, 1995, 1996 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 /* Convert VALUE into ASCII in base BASE (2..36).
  25    Write backwards starting the character just before BUFLIM.
  26    Return the address of the first (left-to-right) character in the number.
  27    Use upper case letters iff UPPER_CASE is nonzero.  */
  28
  29 extern char *_itoa __P ((unsigned long long int value, char *buflim,
  30                          unsigned int base, int upper_case));
  31
  32 static inline char *_itoa_word (unsigned long value, char *buflim,
  33                                 unsigned int base, int upper_case)
  34 {
  35   extern const char _itoa_upper_digits[], _itoa_lower_digits[];
  36   const char *digits = upper_case ? _itoa_upper_digits : _itoa_lower_digits;
  37   char *bp = buflim;
  38
  39   switch (base)
  40     {
  41 #define SPECIAL(Base)                                                         \
  42     case Base:                                                                \
  43       do                                                                      \
  44         *--bp = digits[value % Base];                                         \
  45       while ((value /= Base) != 0);                                           \
  46       break
  47
  48       SPECIAL (10);
  49       SPECIAL (16);
  50       SPECIAL (8);
  51     default:
  52       do
  53         *--bp = digits[value % base];
  54       while ((value /= base) != 0);
  55     }
  56   return bp;
  57 }
  58
  59 #endif  /* itoa.h */