[U-Boot] hashtable lib and escaping

[Wolfgang Denk]

Dear Mats Kärrman,

In message <ED3E0BCACD909541BA94A34C4A164D4C425CEE7A at post.tritech.se> you wrote:
> 
> I used to have a working setup using U-Boot 2009.03 before upgrading to U-Boot 2012.07. The problem I'm facing is related to the escaping policies of lib/hashtable.c.
> 
> What I did before was for example having something like this in my default environment:
> 
> bootcmd=run first_boot
> first_boot=setenv bootcmd my_select\;run ubi_boot;saveenv;boot

THis syntax has never been correct.  If it ever worked, than only by
chance (read: because of incorrect/imperfect code).

> With the escape parsing of himport_r(), the '\' is simply dropped and it is no longer possible to escape ';' so the "run ubi_boot" is immediately executed and nothing is saved... The function header mentions the possibility for multi-line values but thi
> s should not come at the cost of not being able to escape ';'.

You have to be casreful here and keep in mind that (de-) escaping will
take place in a different places: himport() (resp. setenv()) is only
one part of this story - the other part is when you will actually pass
this string to the command processor (the shell).

See here:

	=> setenv foo 'echo part one\;echo part two' ; print foo ; run foo
	foo=echo part one;echo part two
	part one
	part two
	=> setenv foo 'echo part one\\;echo part two' ; print foo ; run foo
	foo=echo part one\;echo part two
	part one;echo part two
	=> 



Best regards,

Wolfgang Denk

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