stdio-common/_itoa.h

   1 /* Internal function for converting integers to ASCII.
   2    Copyright (C) 1994, 95, 96, 97, 98, 99, 2002 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 static inline char * __attribute__ ((unused))
  38 _itoa_word (unsigned long value, char *buflim,
  39             unsigned int base, int upper_case)
  40 {
  41   const char *digits = (upper_case
  42 #if !defined NOT_IN_libc || defined IS_IN_rtld
  43                         ? INTUSE(_itoa_upper_digits)
  44                         : INTUSE(_itoa_lower_digits)
  45 #else
  46                         ? _itoa_upper_digits
  47                         : _itoa_lower_digits
  48 #endif
  49                        );
  50
  51   switch (base)
  52     {
  53 #define SPECIAL(Base)                                                         \
  54     case Base:                                                                \
  55       do                                                                      \
  56         *--buflim = digits[value % Base];                                     \
  57       while ((value /= Base) != 0);                                           \
  58       break
  59
  60       SPECIAL (10);
  61       SPECIAL (16);
  62       SPECIAL (8);
  63     default:
  64       do
  65         *--buflim = digits[value % base];
  66       while ((value /= base) != 0);
  67     }
  68   return buflim;
  69 }
  70 #undef SPECIAL
  71
  72 static inline char * __attribute__ ((unused))
  73 _fitoa_word (unsigned long value, char *buf, unsigned int base, int upper_case)
  74 {
  75   char tmpbuf[sizeof (value) * 4];              /* Worst case length: base 2.  */
  76   char *cp = _itoa_word (value, tmpbuf + sizeof (value) * 4, base, upper_case);
  77   while (cp < tmpbuf + sizeof (value) * 4)
  78     *buf++ = *cp++;
  79   return buf;
  80 }
  81
  82 static inline char * __attribute__ ((unused))
  83 _fitoa (unsigned long long value, char *buf, unsigned int base, int upper_case)
  84 {
  85   char tmpbuf[sizeof (value) * 4];              /* Worst case length: base 2.  */
  86   char *cp = _itoa (value, tmpbuf + sizeof (value) * 4, base, upper_case);
  87   while (cp < tmpbuf + sizeof (value) * 4)
  88     *buf++ = *cp++;
  89   return buf;
  90 }
  91
  92 #endif  /* itoa.h */