带你用C语言实现strtok和字符串分割函数

int main()
{
	char a[] = "wo shi bo zhu";
	char* retArr[10];
	retArr[0] = strtok(a, " ");
	int i = 1;
	while (retArr[i++] = strtok(NULL, " "));
	for (int i = 0; i < 10; i++)
	{
		printf("%s ", retArr[i]);
	}
	return 0;
}

int main()
{
	char a[] = "wo ai ni";
	char* retArr[10];
	retArr[0] = my_strtok(a, " ");
	int i = 1;
	while (retArr[i++] = my_strtok(NULL, " "));
	for (int i = 0; i < 10; i++)
	{
		printf("%s ", retArr[i]);
	}
	return 0;
}

char* my_strtok(char* str, char* delimiters)
{
	//str传NULL的时候如果上次有记录，则用上一次的下一个位置，不然就为NULL
    static char* p_last = NULL;
	if (str == NULL && p_last == NULL)
		return NULL;
	if (str == NULL)
	{
		//用来返回的当前位置
		str = p_last;
		char* tmp = p_last;
		int len = strlen(delimiters);
		while (*tmp)
		{
			for (int i = 0; i < len; ++i)
			{
				if (*tmp == delimiters[i])
				{
					p_last = tmp+1;
					*tmp = '\0';
					return str;
				}
			}
			//走到这里表示当前的tmp没有在delimiters中能找到的
			tmp++;
		}
		//走到这里就是自己走到斜杠\0的位置，就要将p_last 设置成为NULL
		char* ret = p_last;
		p_last = NULL;
		return ret;
	}
	else
	{
		char* tmp = str;
		int len = strlen(delimiters);
		while (*tmp)
		{
			for (int i = 0; i < len; ++i)
			{
				if (*tmp == delimiters[i])
				{
					p_last = tmp+1;
					*tmp = '\0';
					return str;
				}
			}
			//走到这里表示当前的tmp没有在delimiters中能找到的
			tmp++;
		}
		//找到了，找不到
		char* ret = p_last;
		p_last = NULL;
		return ret;
	}
}