/*
 * @copyright Copyright (c) 2016-2020 TOYOTA MOTOR CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <string.h>

char *ultoa(unsigned long value, char *buf, int radix)
{
  const static char c[] = "0123456789abcdef";
  char b[65];
  char *p = b + sizeof(b);

  *--p ='\0';
  do {
    *--p = c[value % (unsigned int)radix];
    value /=  (unsigned int)radix;
  } while (value);
  strcpy(buf, p);

  return buf;
}