libquadmath/printf/_itoa.h

   1 /* Internal function for converting integers to ASCII.
   2    Copyright (C) 1994-1999,2002,2003,2007 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 _ITOA_H
  21 #define _ITOA_H
  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 char _itoa_lower_digits[16] = "0123456789abcdef";
  29 static const char _itoa_upper_digits[16] = "0123456789ABCDEF";
  30
  31 static inline char * __attribute__ ((unused, always_inline))
  32 _itoa_word (unsigned long value, char *buflim,
  33             unsigned int base, int upper_case)
  34 {
  35   const char *digits = (upper_case ? _itoa_upper_digits : _itoa_lower_digits);
  36
  37   switch (base)
  38     {
  39 # define SPECIAL(Base)                                                        \
  40     case Base:                                                                \
  41       do                                                                      \
  42         *--buflim = digits[value % Base];                                     \
  43       while ((value /= Base) != 0);                                           \
  44       break
  45
  46       SPECIAL (10);
  47       SPECIAL (16);
  48       SPECIAL (8);
  49     default:
  50       do
  51         *--buflim = digits[value % base];
  52       while ((value /= base) != 0);
  53     }
  54   return buflim;
  55 }
  56
  57 static inline char * __attribute__ ((unused, always_inline))
  58 _itoa (uint64_t value, char *buflim,
  59        unsigned int base, int upper_case)
  60 {
  61   const char *digits = (upper_case ? _itoa_upper_digits : _itoa_lower_digits);
  62
  63   switch (base)
  64     {
  65       SPECIAL (10);
  66       SPECIAL (16);
  67       SPECIAL (8);
  68     default:
  69       do
  70         *--buflim = digits[value % base];
  71       while ((value /= base) != 0);
  72     }
  73   return buflim;
  74 }
  75 # undef SPECIAL
  76
  77 #endif  /* itoa.h */