05-17-2017
You have a big array of pointers which determines which function gets called. It executes different code because a few pointers point to a different location in memory.
The value of table['a'], or any other vowel, is 0x400656. That's a location in memory which gets jumped to, containing the instructions for the putcharTwice function. All other indexes contain 0x400500, which is just putchar.
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LEARN ABOUT LINUX
pure-mrtginfo
pure-mrtginfo(8) Pure-FTPd pure-mrtginfo(8)
NAME
pure-mrtginfo - provide an MRTG-graphable user count for ftpd
SYNOPSIS
pure-mrtginfo [server port]
DESCRIPTION
Pure-Mrtginfo counts the number of clients currently connected to ftpd(8) and output the format in a format graphable by MRTG.
OPTIONS
server port : defaults to 21.
FILES
/proc/net/tcp
is used to count the connectiont to port 21.
/proc/sys/kernel/hostname
is used to get the fully qualified hostname.
/proc/uptime
is used to get the uptime.
MRTG
MRTG is a really nice package for graphing router traffic. Mrtg can also graph other information is available via SNMP or by running a
program such as pure-mrtginfo. The author of this program uses it to graph CPU load, /var usage etc., and naturally the number of users
connected to his FTP servers. See
http://oss.oetiker.ch/mrtg/
for more information about MRTG.
BUGS
This program only works on GNU/Linux systems yet.
HOME PAGE
http://www.pureftpd.org/
AUTHOR AND LICENSE
Written by Arnt Gulbrandsen <agulbra@troll.no> and copyright 1995-2002 Troll Tech AS, Waldemar Thranes gate 98B, N-0175 Oslo, Norway, fax
+47 22806380.
Pure-FTPd (C)opyleft 2001-2011 by Frank DENIS <j at pureftpd dot org> and the Pure-FTPd team.
Use, modification and distribution is allowed without limitation, warranty, or liability of any kind.
SEE ALSO
ftp(1), pure-ftpd(8) pure-ftpwho(8) pure-mrtginfo(8) pure-uploadscript(8) pure-statsdecode(8) pure-pw(8) pure-quotacheck(8) pure-authd(8)
RFC 959, RFC 2228, RFC 2389 and RFC 2428.
Pure-FTPd Team 1.0.36 pure-mrtginfo(8)