libquadmath/printf/_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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _ITOWA_H
  21 #define _ITOWA_H        1
  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 wchar_t _itowa_lower_digits[16] = L_("0123456789abcdef");
  29 static const wchar_t _itowa_upper_digits[16] = L_("0123456789ABCDEF");
  30
  31 static inline wchar_t *
  32 __attribute__ ((unused, always_inline))
  33 _itowa_word (unsigned long value, wchar_t *buflim,
  34              unsigned int base, int upper_case)
  35 {
  36   const wchar_t *digits = (upper_case
  37                            ? _itowa_upper_digits : _itowa_lower_digits);
  38   wchar_t *bp = buflim;
  39
  40   switch (base)
  41     {
  42 #define SPECIAL(Base)                                                         \
  43     case Base:                                                                \
  44       do                                                                      \
  45         *--bp = digits[value % Base];                                         \
  46       while ((value /= Base) != 0);                                           \
  47       break
  48
  49       SPECIAL (10);
  50       SPECIAL (16);
  51       SPECIAL (8);
  52     default:
  53       do
  54         *--bp = digits[value % base];
  55       while ((value /= base) != 0);
  56     }
  57   return bp;
  58 }
  59
  60 static inline wchar_t *
  61 __attribute__ ((unused, always_inline))
  62 _itowa (uint64_t value, wchar_t *buflim,
  63         unsigned int base, int upper_case)
  64 {
  65   const wchar_t *digits = (upper_case
  66                            ? _itowa_upper_digits : _itowa_lower_digits);
  67   wchar_t *bp = buflim;
  68
  69   switch (base)
  70     {
  71       SPECIAL (10);
  72       SPECIAL (16);
  73       SPECIAL (8);
  74     default:
  75       do
  76         *--bp = digits[value % base];
  77       while ((value /= base) != 0);
  78     }
  79   return bp;
  80 }
  81 #undef SPECIAL
  82
  83 #endif  /* itowa.h */