fgets

Tarts · 12-19-2003, 09:53 PM

I'm still working through "The C programming launguage" by K&R, but also have "Advanced Linux Programming" sitting on my hard drive, I can always use more.

Tarts

infamous41md · 12-20-2003, 12:58 PM

You should have a look at anything written by W Richard Stevens. For starters teh above mentioned, and then the classic Unix Network Programming Vol I after that.

h/w · 12-20-2003, 03:01 PM

is the stevens book available someplace online for viewing/downloading?

infamous41md · 12-20-2003, 05:50 PM

unfortunately no, but i promise you that you'll want to own these books

codedv · 12-21-2003, 10:27 AM

Quote:

Originally posted by h/w
when fgets reads a line, it reads in the '\n' too.
is there a way to use fgets so that it stops reading when it encounters the newline?
thanks.

gets() is bad as theres no way of setting a limit. I have made my own version to solve that problem:

Code:

#include <stdio.h> /* we need this for getchar() and EOF */

int getsn (char * buf, int max)
{
  int count, c;


  for (count = 0; count < max - 1; count++) /* don't forget to leave one for \0 :D */
  {
    if ((c = getchar ()) == '\n' || c == EOF)
      break;
    else
      *(buf + count) = c;
  }

   *(buf + count) = '\0'; /* append the newloine character */

   return (c == EOF)?EOF:0;
}

It looks simple but it works for me.

infamous41md · 12-21-2003, 03:18 PM

he said fgets(), not gets.

codedv · 12-21-2003, 05:38 PM

I know what he asked. But fgets reads a new line - always has done which is why I suggested that function which I often use. It can be easily modified to to work with any file by including an extra file stream argument:

Code:

#include <stdio.h> /* we need this for getc() and EOF */

int getsn (char * buf, FILE * pstream, int max)
{
  int count, c;


  for (count = 0; count < max - 1; count++) /* don't forget to leave one for \0  */
  {
    if ((c = getc (pstream)) == '\n' || c == EOF)
      break;
    else
      *(buf + count) = c;
  }

   *(buf + count) = '\0'; /* append the newloine character */

   return (c == EOF)?EOF:0;
}

h/w · 12-21-2003, 05:49 PM

thanks guys.
codedev: thanks for the code snippets.

this thread can now be closed?

infamous41md · 12-21-2003, 06:20 PM

ahh my apologies, gotcha now codedev.