putnumber.c

一个非常优秀的操作系统源代码

/* Gemini Nucleus
 *
 * $Id: putnumber.c,v 1.2 2000/04/04 09:03:38 verdich Exp $
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. 
 */

#include <types.h>
#include <debug/putchar.h>

#define div(n,base) (                     \
{                                         \
  int __res;                              \
  __res = ((uint32_t)n) % (uint32_t)base; \
  n = ((uint32_t)n) / (uint32_t)base;     \
  __res;                                  \
})

int
aputnumber(int a, uint32_t num, int base, int pad)
{
  static const char *digits = "0123456789abcdef";
  static char tmp[8];
  int i = 0;
  int j;

  if (num == 0)
    tmp[i++] = '0';
  else while (num != 0)
    tmp[i++] = digits[div(num, base)];
  for(j = i; j < pad; j++)
    aputchar(a, '0');
  while(i-- > 0)
    aputchar(a, tmp[i]);
  return 0;
}