Question

I am trying to copy data from a buffer which i know its length to a char[] starting from a given index, the problem is that the data contains null, so the program crashes for a segmentation fault error.

Here is a sample of my code:

char *tmp = list->at(0); //list->at(0) return a pointer to the data
char *pEnd = tmp;
for (i = 0; i<size;i++)
{
     buffer[i] = *pEnd ; //<<<-----here I got the segmentation fault
     pEnd++;
}

Answer 1

If you are saying that list->at(0) returns NULL Then the pointer pEnd will be NULL.

Therefore doing this *pEnd is de-referencing a NULL pointer which will obviously seg fault.

If you want to chek for this, you could check the pointer before de-referencing. for eg:

if(pEnd == NULL)
    //Do nothing or throw error or something
else
    //Go ahead and do your stuff