String to Integer (atoi)

int myAtoi(char * str)
{
    char *iter = str;
    char sign = 1;
    int integer = 0;
    
    while (*iter == ' ')
        iter++;
    
    if (*iter == '-')
    {   
        sign *= -1;
        iter++;
    }
    
    else if (*iter == '+')
    {   
        iter++;
    }
        
    while (*iter >= 48 && *iter <= 57)
    {
        if ((integer == INT_MAX / 10 && *iter - 48 > INT_MAX % 10) || integer > INT_MAX / 10)
                return sign == 1 ? INT_MAX : INT_MIN;
        
        integer *= 10;
        integer += *iter - 48;
        iter++;
    }
        
    
    return integer * sign;
    

}