stdio-common/_itoa.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 _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 (unsigned long long int value, char *buflim,
  30                     unsigned int base, int upper_case);
  31
  32 extern const char _itoa_upper_digits[];
  33 extern const char _itoa_upper_digits_internal[] attribute_hidden;
  34 extern const char _itoa_lower_digits[];
  35 extern const char _itoa_lower_digits_internal[] attribute_hidden;
  36
  37 #ifndef NOT_IN_libc
  38 extern char *_itoa_word (unsigned long value, char *buflim,
  39                          unsigned int base, int upper_case);
  40 #else
  41 static inline char * __attribute__ ((unused, always_inline))
  42 _itoa_word (unsigned long value, char *buflim,
  43             unsigned int base, int upper_case)
  44 {
  45   const char *digits = (upper_case
  46 # if defined IS_IN_rtld
  47                         ? INTUSE(_itoa_upper_digits)
  48                         : INTUSE(_itoa_lower_digits)
  49 # else
  50                         ? _itoa_upper_digits
  51                         : _itoa_lower_digits
  52 # endif
  53                        );
  54
  55   switch (base)
  56     {
  57 # define SPECIAL(Base)                                                        \
  58     case Base:                                                                \
  59       do                                                                      \
  60         *--buflim = digits[value % Base];                                     \
  61       while ((value /= Base) != 0);                                           \
  62       break
  63
  64       SPECIAL (10);
  65       SPECIAL (16);
  66       SPECIAL (8);
  67     default:
  68       do
  69         *--buflim = digits[value % base];
  70       while ((value /= base) != 0);
  71     }
  72   return buflim;
  73 }
  74 # undef SPECIAL
  75 #endif
  76
  77 /* Similar to the _itoa functions, but output starts at buf and pointer
  78    after the last written character is returned.  */
  79 extern char *_fitoa_word (unsigned long value, char *buf, unsigned int base,
  80                           int upper_case) attribute_hidden;
  81 extern char *_fitoa (unsigned long long value, char *buf, unsigned int base,
  82                      int upper_case) attribute_hidden;
  83
  84 #endif  /* itoa.h */