Thread: memcpy(msg->data+msg->dsize, ..)

memcpy function is used for copy to dst from src with size:

Code:

memcpy(dst, src, size)

If msg structure was defined as follow:

Code:

struct msg{
       char data[100];
       int dsize;
}

and buf defined as follow:

Code:

struct buf{
       char *data;
       int len;
}

Now if i run below command:

Code:

memcpy(msg->data+msg->dsize, buf->data, buf->len)

Does copy buf->data to msg->data? If yes, what is effect of msg->dsize?

I saw this in a C project.