//
// Created by YY on 2019/12/23.
//

#include "num.h"
#include <sstream>
#include <iosfwd>
#include <iomanip>

using namespace std;

long str2int(const uint8_t *s, uint16_t length)
{
    uint16_t i;
    long n = 0;
    bool sign = false;

    for(i = 0; i < length; i++)
    {

        if(s[i] >= '0' && s[i] <= '9') {
            n = n*10 + s[i] - '0';
        } else if (i == 0 && s[i]=='-') {
            sign = true;
        }
    }

    if (sign) {
        n = 0-n;
    }

    return n;
}

bool str2float(double *f, const uint8_t *s, uint16_t length)
{
    bool sign = false;
    bool getDecimal = false;
    uint16_t i;
    uint64_t m = 0, n = 1;
    double x;

    *f = 0.0;

    for(i = 0; i < length; i++)
    {
        if(s[i] == '-' || s[i] == '+') {
            if(i == 0) {
                if (s[i] == '-') {
                    sign = true;
                }
            }
            else {
                return false;
            }
        }
        else if(s[i] == '.') {
            if(getDecimal == true) {
                return false;
            }
            getDecimal = true;
        }
        else if(s[i] >= '0' && s[i] <= '9') {
            m = m*10 + s[i] - '0';
            if(getDecimal == true) {
                n *= 10;
            }
        }
        else {
            return false;
        }
    }

    x = (double)m / (double)n;
    if(sign) {
        x = 0.0 - x;
    }
    *f = x;

    return true;
}

int BitCount(uint32_t n)
{
    n = (n &0x55555555) + ((n >>1) &0x55555555);
    n = (n &0x33333333) + ((n >>2) &0x33333333);
    n = (n &0x0f0f0f0f) + ((n >>4) &0x0f0f0f0f);
    n = (n &0x00ff00ff) + ((n >>8) &0x00ff00ff);
    n = (n &0x0000ffff) + ((n >>16) &0x0000ffff);

    return n ;
}

double round(double number, unsigned int bits) {
    stringstream ss;
    ss << setiosflags(ios::fixed) << setprecision(bits) << number;
    ss >> number;
    return number;
}

string intw(int n, int w)
{
    stringstream ss;

    ss << setfill('0') << setw(w) << n;

    return ss.str();
}