text: /*  This file is part of The Firekylin Operating System.
   *
   *  Copyright 2016 Liuxiaofeng
   *
   *  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 <stdlib.h>
  #include <ctype.h>
  
  unsigned long long strtoull(const char *str, char **endptr, int base)
  {
  	unsigned long long ret = 0;
  	char *p = (char *) str;
  
  	while (isspace(*p))
  		p++;
  	while (isdigit(*p)) {
  		ret = ret * 10 + *p - '0';
  		p++;
  	}
  	if (endptr)
  		*endptr = p;
  
  	return ret;
  }
  