double ft_atof(const char *str)
{
double result;
double rest;
int sign;
if (!str || !*str)
return (0);
result = 0;
rest = 0;
sign = 1;
if (*str && *str == '-')
{
str++;
sign = -1;
}
while (*str && *str >= '0' && *str <= '9')
{
result = result * 10 + (*str - '0');
str++;
}
if (*str == '.' && *(str + 1) >= '0' && *(str + 1) <= '9'
&& *str && *(str + 1))
rest = ft_convert_rest(str);
return (sign * (result + rest));
}
static void ft_convert(char *str, double n, size_t precision)
{
int dot;
dot = 0;
if (n < 0)
{
*str = '-';
n = -n;
str++;
}
while (n >= 1 && dot++ >= 0)
n /= 10;
ft_convert_rest(str, n, precision, dot);
}