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Full Discussion: Pure C function pointer on printing vowels twice
Top Forums Programming Pure C function pointer on printing vowels twice Post 302997645 by Corona688 on Wednesday 17th of May 2017 04:22:30 PM
Old 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 DEBIAN

pure-pw

pure-pw(8)							     Pure-FTPd								pure-pw(8)

NAME

       pure-pw - Manage virtual users files for Pure-FTPd

SYNTAX

       pure-pw useradd login [-f passwd_file] [-F puredb_file] -u uid [-g gid]
		       -D/-d home_directory [-c gecos]
		       [-t download_bandwidth] [-T upload_bandwidth]
		       [-n max number_of_files] [-N max_Mbytes]
		       [-q upload_ratio] [-Q download_ratio]
		       [-r <allow client host>/<mask>[,<ip>/<mask>]...] [-R <deny client host>/<mask>[,<ip>/<mask>]...]
		       [-i <allow local host>/<mask>[,<ip>/<mask>]...] [-I <deny local host>/<mask>[,<ip>/<mask>]...]
		       [-y <max number of concurrent sessions>]
		       [-z <hhmm>-<hhmm>] [-m]
       pure-pw usermod login [-f passwd_file] [-F puredb_file] [-u uid] [-g gid]
		       -D/-d home_directory -[c gecos]
		       [-t download_bandwidth] [-T upload_bandwidth]
		       [-n max_number_of_files] [-N max_Mbytes]
		       [-q upload_ratio] [-Q download_ratio]
		       [-r <allow client host>/<mask>[,<ip>/<mask>]...] [-R <deny client host>/<mask>[,<ip>/<mask>]...]
		       [-i <allow local host>/<mask>[,<ip>/<mask>]...] [-I <deny local host>/<mask>[,<ip>/<mask>]...]
		       [-y <max number of concurrent sessions>]
		       [-z <hhmm>-<hhmm>] [-m]
       pure-pw userdel login [-f passwd_file] [-F puredb_file] [-m]
       pure-pw passwd  login [-f passwd_file] [-F puredb_file] [-m]
       pure-pw show    login [-f passwd_file] [-m]
       pure-pw mkdb    [<puredb_database_file> [-f passwd_file]] [-F puredb_file]
       pure-pw list    [-f passwd_file]

DESCRIPTION

       Virtual	users  is a simple mechanism to store a list of users, with their password, name, uid, directory, etc. It's just like /etc/passwd.
       But it's not /etc/passwd. It's a different file, only for FTP.
       It means that you can easily create FTP-only accounts without messing your system accounts.
       Additionnaly, virtual users files can store individual quotas, ratios, bandwidth, etc. System accounts can't do this.
       Thousands of virtual users can share the same system user, as long as they all are chrooted, and they have their own home directory.

FILES

       /etc/pure-ftpd/pureftpd.passwd
       /etc/pure-ftpd/pureftpd.pdb

ENVIRONMENT VARIABLES

       PURE_PASSWDFILE If this variable is defined, this is the default value for the  text  password  file.  Without  this  variable,	/etc/pure-
       ftpd/pureftpd.passwd is assumed.
       PURE_DBFILE  If	this  variable	is  defined,  this  is	the  default value for the PureDB password file. Without this variable, /etc/pure-
       ftpd/pureftpd.pdb is assumed.

EXAMPLES

       Please read http://download.pureftpd.org/pub/pure-ftpd/doc/README.Virtual-Users

AUTHORS

       Frank DENIS <j at pureftpd dot org>

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-pw(8)
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