New FTP commands

[hinko.kocevar at cetrtapot.si]

Hi all,

I've need simple busybox ftp to perform some additional actions on FTP 
server such as delete a file, append to a file and list servers 
directory. Here is the patch...

I've added needed functions and changed Makefile.in and Config.in 
accordingly. Main difference is that ony one link is created - 'ftp' 
(instead of two - 'ftpget' and 'ftpput') which also makes addition of 
other FTP command straightforward. Action to be performed if selected 
via commandline switch like this:
RETRIEVE FILE:
ftp -r <other options> HOST REMOTE-FILE LOCAL-FILE

SEND FILE:
ftp -s <other options> HOST LOCAL-FILE REMOTE-FILE

DELETE FILE:
ftp -d	<other options> HOST REMOTE-DIR REMOTE-FILE

APPEND FILE:
ftp -a <other options> HOST LOCAL-FILE REMOTE-FILE

LIST,NLIST:
ftp -l <other options> HOST REMOTE-DIR OUT-FILE
ftp -n <other options> HOST REMOTE-DIR OUT-FILE

<other options> remain the same as for previous implementation of ftp 
client. Every supported FTP command can be enabled/disabled in menuconfig.

This patch is based on 
http://www.busybox.net/lists/busybox/2005-June/014644.html and is to be 
applied to stable 1.01 release (not SVN).

Some stuff could be optimized away ... any comments welcomed.

--
regards,
hinkok
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