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Full Discussion: Read redirected file from stdin in C (a.out < file)
Top Forums Programming Read redirected file from stdin in C (a.out < file) Post 302492921 by semash! on Tuesday 1st of February 2011 10:57:12 PM
Old 02-01-2011
Read redirected file from stdin in C (a.out < file)
Hello everybody,
Having a file with the following content:
Code:
192.168.0.254->192.168.0.1
192.168.0.2->192.168.0.34
192.168.0.56->192.168.0.77

I need to code a program in C to read it from stdin redirection (i.e. root@box~# ./a.out < file), my question is, how can i do that?

I've tried with functions like fscanf(stdin, "%s->%s", var1, var2), but it only reads the first line of the file. How do i pass to the next line in file, and how do i detect the EOF?

Thanks in advance!
 

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LEARN ABOUT DEBIAN

prips

PRIPS(1)						    BSD General Commands Manual 						  PRIPS(1)

NAME

     prips -- print the IP addresses in a given range

SYNOPSIS

     prips [-c] [-d delim] [-e exclude] [-f format] [-i incr] start end
     prips [-c] [-d delim] [-e exclude] [-f format] [-i incr] CIDR-block
     prips -h

DESCRIPTION

     The prips tool can be used to print all of the IP addresses in a given range.  It can enhance tools that only work on one host at a time,
     e.g.  whois(1).

     The prips tool accepts the following command-line options:

     -c      Print the range in CIDR notation.

     -d delim
	     Set the delimiter to the character with ASCII code delim where 0 <= delim <= 255.

     -e <x.x.x,x.x>
	     Exclude ranges from the output.

     -f format
	     Set the format of addresses (hex, dec, or dot).

     -h      Show summary of options.

     -i incr
	     Set the increment to 'x'.

ENVIRONMENT

     The prips tool's operation is not influenced by any environment variables.

FILES

     The prips tool's operation is not influenced by any files.

EXAMPLES

     Display all the addresses in a reserved subnet:

	   prips 192.168.32.0 192.168.32.255

     The same, using CIDR notation:

	   prips 192.168.32/24

     Display only the usable addresses in a class A reserved subnet using a space instead of a newline for a delimiter:

	   prips -d 32 10.0.0.1 10.255.255.255

     Display every fourth address in a weird block:

	   prips -i 4 192.168.32.7 192.168.33.5

     Determine the smallest CIDR block containing two addresses:

	   prips -c 192.168.32.5 192.168.32.11

DIAGNOSTICS

     The prips utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     ipsc(1), gipsc(1)

STANDARDS

     No standards were harmed in the writing of the prips tool.

HISTORY

     The prips tool was originally written by Daniel Kelly and later adopted by Peter Pentchev.  This manual page was originally written by Juan
     Alvarez for the Debian GNU/Linux system and later added to the prips distribution and converted to mdoc format by Peter Pentchev.

AUTHORS

     Daniel Kelly <dan@vertekcorp.com>
     Juan Alvarez <jalvarez@fluidsignal.com>
     Peter Pentchev <roam@ringlet.net>

BUGS

     Please report any bugs in the prips tool to its current maintainer, Peter Pentchev.

BSD
								   March 1, 2011							       BSD
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