libedit fixes

[Bastian M. <bma...@we...>]

Hello list,

Could somebody with a Mac and/or Linux system with editline please 
verify the attached patches?

It contains several fixes for using gnuplot with libedit (version 2.11, 
2008-06-14) on Ubuntu 10.04. I believe all recent flavours of Debian 
also include this version. I hope it does not break anything for the 
more recent version used on Macs.

Did anybody else observe the issues described below?

The following issues should be fixed:


1) cannot change editline settings via .editrc

* plot.c(main): init rl_library_name before first call to editline, 
otherwise .editrc does not work
	

2) history gets "out of sync" when issuing a command that is already in 
history and not the last (command.c:rlgets)

* command.c(rlgets): removing duplicate entries from history does not 
work with editline, so just avoid adding same command repeatedly

   Example:
	print 1
	print 2
	history 5
	print 1
	history 5


3) "history ?..." does not find anything (although it should)

* history.c(history_find_all): editline's version of history_set_pos() 
does not work, so traverse history list manually. Also, history indices 
are reversed wrt GNU readline


4) "history n" prints one item less than when using readline

* history.c(write_history_list): editline's version of history_get() 
uses zero based indices


5) some libedit related code "cleanup"

* command.c(history_command): mention editline in message for missing 
history support

* history.c: use ANSI C definitions

* readline.c(getc_wrapper): generalize code for libeditline

* gp_hist.h: fix typo


--

Bastian