cnpy::npy_save not checking if file is open (leading to segmentation fault)

[VladikNeVladik]

Somewhere in the cnpy::npy_save(...):

if (fp) {
    ...
}
else {
    fp = fopen(fname.c_str(),"wb");
    true_data_shape = shape;
}
...
fseek(fp,0,SEEK_SET); // It raises segmentation fault

[adrian-bodenmann]

Running into the same issue. Should check if fp is valit (not NULL), and if not valid gracefully abort or throw an exception. Not doing so causes fseek() to segmentation fault