read the i/p file
count the no. of '\n' characters
if count > k (argument of tail) then print all chars till EOF
correct me if m wrong !!!
On Aug 16, 9:16 am, vikas kumar <vikas.kumar...@gmail.com> wrote:
> the method of farword seek is inefficient. consider case of 100000
> lines and you want to display only 3-4 lines. better seek from end.
>
> se a buffer[buf_size].
>
> let size =filesize.
> lc = 0;
> while(lc <= given line input)
> {
> fseek(fp, size);
> if(size < buf_size)
> fread(fp, size, buffer);
> else
> fread(fp, size, buf_size);
>
> parse buf_size for '\n'
> if( \n is in buffer )
> increment line counter(lc ++)
> if(size < buf_size)
> size -= buf_size
>
> }
>
> // you know the size, read the buffer one by one and print it
> OR
> // you could have put them while reading on to stack and print it out
> now
>
> On Aug 15, 8:46 am, Dave <dave_and_da...@juno.com> wrote:
>
>
>
> > Enter the lines into a FIFO queue as you read them. After you have
> > enqueued n lines, dequeue a line every time you enqueue one, so that
> > the queue will contain the last n (or fewer) lines of the file.
>
> > Dave
>
> > On Aug 13, 1:13 pm, amit <amitjaspal...@gmail.com> wrote:
>
> > > I am trying using fseek but somehow its not working?- Hide quoted text -
>
> > - Show quoted text -
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