stdio-common/_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 #include <limits.h>
  24
  25 /* Convert VALUE into ASCII in base BASE (2..36).
  26    Write backwards starting the character just before BUFLIM.
  27    Return the address of the first (left-to-right) character in the number.
  28    Use upper case letters iff UPPER_CASE is nonzero.  */
  29
  30 extern char *_itoa (unsigned long long int value, char *buflim,
  31                     unsigned int base, int upper_case);
  32
  33 extern const char _itoa_upper_digits[];
  34 extern const char _itoa_upper_digits_internal[] attribute_hidden;
  35 extern const char _itoa_lower_digits[];
  36 extern const char _itoa_lower_digits_internal[] attribute_hidden;
  37
  38 #ifndef NOT_IN_libc
  39 extern char *_itoa_word (unsigned long value, char *buflim,
  40                          unsigned int base, int upper_case);
  41 #else
  42 static inline char * __attribute__ ((unused, always_inline))
  43 _itoa_word (unsigned long value, char *buflim,
  44             unsigned int base, int upper_case)
  45 {
  46   const char *digits = (upper_case
  47 # if defined IS_IN_rtld
  48                         ? INTUSE(_itoa_upper_digits)
  49                         : INTUSE(_itoa_lower_digits)
  50 # else
  51                         ? _itoa_upper_digits
  52                         : _itoa_lower_digits
  53 # endif
  54                        );
  55
  56   switch (base)
  57     {
  58 # define SPECIAL(Base)                                                        \
  59     case Base:                                                                \
  60       do                                                                      \
  61         *--buflim = digits[value % Base];                                     \
  62       while ((value /= Base) != 0);                                           \
  63       break
  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 #endif
  77
  78 /* Similar to the _itoa functions, but output starts at buf and pointer
  79    after the last written character is returned.  */
  80 extern char *_fitoa_word (unsigned long value, char *buf, unsigned int base,
  81                           int upper_case) attribute_hidden;
  82 extern char *_fitoa (unsigned long long value, char *buf, unsigned int base,
  83                      int upper_case) attribute_hidden;
  84
  85 #if LONG_MAX == LLONG_MAX
  86 /* No need for special long long versions.  */
  87 # define _itoa(value, buf, base, upper_case) \
  88   _itoa_word (value, buf, base, upper_case)
  89 # define _fitoa(value, buf, base, upper_case) \
  90   _fitoa_word (value, buf, base, upper_case)
  91 #endif
  92
  93 #endif  /* itoa.h */