stdio-common/_itowa.h

   1 /* Internal function for converting integers to ASCII.
   2    Copyright (C) 1994,95,96,97,98,99,2002,2003 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _ITOWA_H
  20 #define _ITOWA_H        1
  21 #include <features.h>
  22 #include <wchar.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 wchar_t *_itowa (unsigned long long int value, wchar_t *buflim,
  30                         unsigned int base, int upper_case);
  31
  32 static inline wchar_t *
  33 __attribute__ ((unused, always_inline))
  34 _itowa_word (unsigned long value, wchar_t *buflim,
  35              unsigned int base, int upper_case)
  36 {
  37   extern const wchar_t _itowa_upper_digits[] attribute_hidden;
  38   extern const wchar_t _itowa_lower_digits[] attribute_hidden;
  39   const wchar_t *digits = (upper_case
  40                            ? _itowa_upper_digits : _itowa_lower_digits);
  41   wchar_t *bp = buflim;
  42
  43   switch (base)
  44     {
  45 #define SPECIAL(Base)                                                         \
  46     case Base:                                                                \
  47       do                                                                      \
  48         *--bp = digits[value % Base];                                         \
  49       while ((value /= Base) != 0);                                           \
  50       break
  51
  52       SPECIAL (10);
  53       SPECIAL (16);
  54       SPECIAL (8);
  55     default:
  56       do
  57         *--bp = digits[value % base];
  58       while ((value /= base) != 0);
  59     }
  60   return bp;
  61 }
  62 #undef SPECIAL
  63
  64 #endif  /* itowa.h */