C++程序读入文件一直正在运行，读入数据无法选特定元素读入

Question

问题遇到的现象和发生背景

编写导航星历文件读入的时候，生成解决方案没有错误，但调试和运行都无法结束

问题相关代码，请勿粘贴截图

int Nread(int &num)
{
ifstream ifs;
ifs.open("brdm1120.21p", ios::_Nocreate);
if (!ifs.is_open())
{
cout << "文件打开失败" << endl;
return -1;
}
cout << "文件打开成功" << endl;
const int max = 100;//每行字符数
char line[max];
//计算星历数
int line1 = 0;
while (1)
{
if (strstr(line, "END OF HEADER") != NULL)
break;
}
while (1) {
if (strstr(line, "RO1") != NULL)
break;
GPSTIME *pGpsTime = new GPSTIME[num];
NfileRead *ephlst = new NfileRead[num];

    int PRN;
    char column_1[100];
    int year, mon, day, hour, min;
    double sec;
    double a0, a1, a2;
    double iode, Crs, delta_n, M0;
    double Cuc, e, Cus, sqrt_a;
    double toe, Cic, OMG0, Cis;
    double i0, Crc, omgs, OMG;
    double idot, code, GPS_Week, L2_P;
    double SVaccuracy, SVhealth, TGD, IODC;
    double messeagetime, fitinterval;

    char str[max];
    ifs.getline(str, max, '\n');//读取第一行数据
    sscanf(str, "%s %d %d %d %d %d %d %lf %lf %lf", column_1, &year, &mon, &day, &hour, &min, &sec, &a0, &a1, &a2);
    int prn = 0;
    sscanf(column_1, "G%d", &prn);
    cout << hour << "    " << min << "    " << sec << "   " << prn << endl;
    ifs.getline(str, max, '\n');//读取第二行数据
    sscanf(str, "%lf %lf %lf %lf", &iode, &Crs, &delta_n, &M0);
    ifs.getline(str, max, '\n');//读取第三行数据
    sscanf(str, "%lf %lf %lf %lf", &Cuc, &e, &Cus, &sqrt_a);
    ifs.getline(str, max, '\n');//读取第四行数据
    sscanf(str, "%lf %lf %lf %lf", &toe, &Cic, &OMG0, &Cis);
    ifs.getline(str, max, '\n');//读取第五行数据
    sscanf(str, "%lf %lf %lf %lf", &i0, &Crc, &omgs, &OMG);
    ifs.getline(str, max, '\n');//读取第六行数据
    sscanf(str, "%lf %lf %lf %lf", &idot, &code, &GPS_Week, &L2_P);
    ifs.getline(str, max, '\n');//读取第七行数据
    sscanf(str, "%lf %lf %lf %lf", &SVaccuracy, &SVhealth, &TGD, &IODC);
    ifs.getline(str, max, '\n');//读取第八行数据
    sscanf(str, "%lf %lf", &messeagetime, &fitinterval);

    //数据放入数组
    ephlst[line1].year = year;
    ephlst[line1].mon = mon;
    ephlst[line1].day = day;
    ephlst[line1].hour = hour;
    ephlst[line1].min = min;
    ephlst[line1].sec = sec;

    ephlst[line1].PRN = prn;
    ephlst[line1].a0 = a0;
    ephlst[line1].a1 = a1;
    ephlst[line1].a2 = a2;

    ephlst[line1].iode = iode;
    ephlst[line1].Crs = Crs;
    ephlst[line1].delta_n = delta_n;
    ephlst[line1].M0 = M0;
    //&Cuc, &e, &Cus, &sqrt_a
    ephlst[line1].Cuc = Cuc;
    ephlst[line1].e = e;
    ephlst[line1].Cus = Cus;
    ephlst[line1].sqrt_a = sqrt_a;
    //&toe, &Cic, &OMG0, &Cis
    ephlst[line1].toe = toe;
    ephlst[line1].Cic = Cic;
    ephlst[line1].OMG0 = OMG0;
    ephlst[line1].Cis = Cis;
    //&i0, &Crc, &omgs, &OMG
    ephlst[line1].i0 = i0;
    ephlst[line1].Crc = Crc;
    ephlst[line1].omgs = omgs;
    ephlst[line1].OMG = OMG;
    ephlst[line1].idot = idot;
    line1++;
    
}
ifs.close();

}

我的解答思路和尝试过的方法

以为是数据过长，电脑配置导致的错误，只保留GPS数据，运行依旧无法结束

我想要达到的结果

头文件不读入，只从END OF HEADER开始，文件只读入GPS数据和北斗数据并且放入指定数组
文件读入开始部分：

GPS数据结尾：

北斗数据开头：

Answer 1

char line[max];
while (1)
{
if (strstr(line, "END OF HEADER") != NULL)
break;
}
这个循环里没有读取操作，循环没意义。