stdio/_itoa.c

   1 /* Internal function for converting integers to ASCII.
   2 Copyright (C) 1994 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 Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <ansidecl.h>
  21 #include "_itoa.h"
  22
  23 /* Lower-case digits.  */
  24 CONST char _itoa_lower_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
  25 /* Upper-case digits.  */
  26 CONST char _itoa_upper_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  27
  28 char *
  29 DEFUN(_itoa, (value, buflim, base, upper_case),
  30       unsigned long long int value AND char *buflim AND
  31       unsigned int base AND int upper_case)
  32 {
  33   /* Base-36 digits for numbers.  */
  34   CONST char *digits = upper_case ? _itoa_upper_digits : _itoa_lower_digits;
  35
  36   register char *bp = buflim;
  37
  38   while (value > 0)
  39     {
  40       *--bp = digits[value % base];
  41       value /= base;
  42     }
  43
  44   return bp;
  45 }