double转字符串函数double2string

void double2string(char *str, double double_number, unsigned char len)
{
    static char table[]={'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
    unsigned char i;
    unsigned char j = 0;
    unsigned char str_cnt = 0;
    int int_number = 0;
    double decimal_number = 0.0;
    int temp = 0;

    if(double_number < 0)
    {
        str[0] = '-';
        str_cnt++;
        double_number = double_number * (-1);
    }

    int_number = double_number / 1;
	
	char int_str[32] = {0};
	i = 0;
    while(1)
    {
        if (int_number == 0)
        {
            int_str[i] = table[0];
            i++;
            break;
        }
        else
        {
            int_str[i] = table[int_number%10];
            i++;
        }

        int_number = int_number / 10;
        if(int_number == 0)
        {
            break;
        }
    }
    
    
    for(j = i;j > 0;j--)
    {
    	*(str + str_cnt) = int_str[j- 1];
    	str_cnt++;
	}
	
    str[str_cnt] = '.';
    str_cnt++;

    temp = 0.0;
    decimal_number = double_number;
    for(i = 0; i < len; i++)
    {
        decimal_number = decimal_number * 10;
        temp = decimal_number / 1;
        str[str_cnt] = table[temp % 10];
        str_cnt++;
        
    }
    str[str_cnt] = '\0';
}