Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: C, using fscanf
Top Forums Programming C, using fscanf Post 302311552 by otheus on Wednesday 29th of April 2009 03:50:08 AM
Old 04-29-2009
I think given that you went through your professor first before coming here warrants some kind of leniency, but that's just my opinion, and I'm still new here.

In general, real programmers (tm) use "readline" and avoid scanf functions. The main problem with the scanf functions is their inherent lack of efficiency and security,oh -- and buffer overflows. To do character-by-character, one usually uses fgetc(). Search for tips on using readline/strtok. If the prof is making you do character-by-character, then use fgetc to build up your character array.
Last edited by otheus; 04-29-2009 at 07:47 AM.. Reason: efficiency is primary
 

7 More Discussions You Might Find Interesting

1. Programming

fscanf()

thanks to everyone for your earlier replies, but i have yet another problem with file i/o. i'm trying to read multiple lines with the same file, and have been using the following code to take in the first two lines from a file... fscanf(fileptr, "%d %d %d %d %d %d\n", &n1, &n2, &n3, &n4, &n5,... (1 Reply)
Discussion started by: j_t_kim
1 Replies

2. Programming

fscanf()

I keep trying to use fscanf() and for some reason I can't get the syntax down and always get seg faults. I'm on a SunOS 5.5.1, and my current code looks like this: int n1, n2, n3, n4, n5, n6; /* open config file */ if (fileptr = fopen(filename,"r") == NULL) { printf("couldn't open... (3 Replies)
Discussion started by: j_t_kim
3 Replies

3. Programming

fscanf

Hi, Can any one tell me what "%hx" as control parameter mean in fscanf. Thanks, abey (4 Replies)
Discussion started by: abey
4 Replies

4. Programming

read a file wich fscanf() in a function

I use fopen, fscanf, fclose to read a file. It can work well. since many files should be read, a function is created with the same code. But in the function, fscanf can not work well. for example, the first line of the the file is: > filename but the fscanf will give: 207/23/eee/34 it appears... (2 Replies)
Discussion started by: cdbug
2 Replies

5. Programming

fscanf: read words from file

Hi I have a file like that: 1 2 3 4 5 6 7 8 and I want print on stdout: 1 3 8 in other words i want choose what print out. I was thinking to use fscanf as: fscanf(file_in,"%d %d %d",&a, &b,&c); but in this way i get: 1 2 3 Is there a solution using fscanf to obtain my... (2 Replies)
Discussion started by: Dedalus
2 Replies

6. UNIX for Dummies Questions & Answers

how fscanf every two data

hi there... i have a question regarding the fscanf function... let's say i have a data: 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 how do i read only the first COLUMN, or the second COLUMN or the third COLUMN or etc....?????? thanks (1 Reply)
Discussion started by: theunknown
1 Replies

7. Programming

Fscanf to get number and replace.

Hi, I have a file with contents like "abcd 1234" .What i need is get that integer and replace that with 0. So i used fscanf(fp,"%s %d", str, &num); This is having some problem. There can be multiple space/tab between string and number. How to replace that number with 0 in same file? (4 Replies)
Discussion started by: explore
4 Replies

LEARN ABOUT OSX

ansi_ctrlu

term::ansi::ctrl::unix(n)					 Terminal control					 term::ansi::ctrl::unix(n)

__________________________________________________________________________________________________________________________________________________

NAME

       term::ansi::ctrl::unix - Control operations and queries

SYNOPSIS

       package require Tcl  8.4

       package require term::ansi::ctrl::unix  ?0.1?

       ::term::ansi::ctrl::unix::import ?ns? ?arg...?

       ::term::ansi::ctrl::unix::raw

       ::term::ansi::ctrl::unix::raw

       ::term::ansi::ctrl::unix::columns

       ::term::ansi::ctrl::unix::rows

_________________________________________________________________

DESCRIPTION

       WARNING:  This  package	is  unix-specific  and depends on the availability of two unix system commands for terminal control, i.e. stty and
       tput, both of which have to be found in the $PATH. If any of these two commands is missing the loading of the package will fail.

       The package provides commands to switch the standard input of the current process between raw and cooked input modes, and to query the size
       of terminals, i.e. the available number of columns and lines.

API

   INTROSPECTION
       ::term::ansi::ctrl::unix::import ?ns? ?arg...?
	      This  command imports some or all attribute commands into the namespace ns. This is by default the namespace ctrl. Note that this is
	      relative namespace name, placing the imported command into a child of the current namespace. By default all commands  are  imported,
	      this can howver be restricted by listing the names of the wanted commands after the namespace argument.

   OPERATIONS
       ::term::ansi::ctrl::unix::raw
	      This command switches the standard input of the current process to raw input mode. This means that from then on all characters typed
	      by the user are immediately reported to the application instead of waiting in the OS buffer until the Enter/Return key is received.

       ::term::ansi::ctrl::unix::raw
	      This command switches the standard input of the current process to cooked input mode. This means that from then  on  all	characters
	      typed by the user are kept in OS buffers for editing until the Enter/Return key is received.

       ::term::ansi::ctrl::unix::columns
	      This command queries the terminal connected to the standard input for the number of columns available for display.

       ::term::ansi::ctrl::unix::rows
	      This command queries the terminal connected to the standard input for the number of rows (aka lines) available for display.

BUGS, IDEAS, FEEDBACK
       This  document, and the package it describes, will undoubtedly contain bugs and other problems.	Please report such in the category term of
       the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you  may  have  for
       either package and/or documentation.

KEYWORDS

       ansi, columns, control, cooked, input mode, lines, raw, rows, terminal

CATEGORY

       Terminal control

COPYRIGHT

       Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>

term									0.1						 term::ansi::ctrl::unix(n)
All times are GMT -4. The time now is 10:09 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy