topic Re: Reading line by line using C in Operating System - Linux

Reading line by line using C

Henry Chua — Mon, 25 Jul 2005 20:08:30 GMT

Hi guys,

Is there a way to write a c program to read a textfile line by line and also field by field seperated by a seperator i.e. like awk.

Best regards
Henry

Re: Reading line by line using C

A. Clay Stephenson — Mon, 25 Jul 2005 20:53:08 GMT

The fgets() function will read until it 1) encounters a linefeed, 2) reaches EOF, or 3) fills the buffer you specify with the 'n' (2nd) parameter. The file pointer is left unchanged so the next call to fgets() will read the next line. Man fgets for details.

To parse a line of text after reading it in with fgets() use strtok() or sscanf(). Man strtok, scanf for details.

Re: Reading line by line using C

Biswajit Tripathy — Mon, 25 Jul 2005 22:33:07 GMT

As A Clay Stephenson said, use fgets() followed
by strtok(). Be very careful while using
strtok(), it's a little tricky if you have not
used it before.

Another possible (and simpler) option is
strchr() instead of strtok(). See manpage for
more detail.

- Biswajit

Re: Reading line by line using C

Henry Chua — Tue, 26 Jul 2005 04:14:01 GMT

thanks guys, your suggestion works great.!