libc/stdlib/itoa.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program 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
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <string.h>
  20
  21 char *itoa (int value, char *string, int radix)
  22 {
  23         char buf[16];
  24         char * where = buf + 16 - 1;
  25         *where = '\0';
  26
  27         do
  28         {
  29                 unsigned long temp = (unsigned long)value % radix;
  30                 where--;
  31                 if(temp < 10)
  32                         *where = temp + '0';
  33                 else
  34                         *where = temp - 10 + 'a';
  35                 value = (unsigned long)value / radix;
  36         }
  37         while(value != 0);
  38
  39         unsigned l = strlen (where);
  40         memcpy (string, where, l);
  41         string [l] = '\0';
  42
  43         return string;
  44 }