Add error checking for poorly-formed crossystem args

Add error checking for poorly-formed crossystem args

R=petkov@chromium.org
BUG=chromium-os:13322
TEST=manual

The following command lines should cause crossystem to fail with a
warning about a poorly formed parameter:
  crossystem ''
  crossystem '=cros_debug'
  crossystem '?cros_debug'

The following command line should warn that you can't use both = and ?:
  crossystem cros_debug?=0
(that is, it warns, not just compares with '=0')

The following should print 'UNEQUAL'
  crossystem cros_debug? || echo UNEQUAL
(because it's comparing cros_debug with an empty string)

Review URL: http://codereview.chromium.org/6718012

Change-Id: I2e2851515f4914b16aba64065600fb92d9ad1a63
(cherry picked from commit f27583f08361522909e49155d8b14671f644ec85)

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=70c50c9

[petkov, 2011-03-22 00:13:36]

LGTM

http://codereview.chromium.org/6675014/diff/1/utility/crossystem_main.c
File utility/crossystem_main.c (right):

http://codereview.chromium.org/6675014/diff/1/utility/crossystem_main.c#newco...
utility/crossystem_main.c:241: PrintHelp(progname);
so this is not a warning but an error?

[puneetster1, 2011-03-22 01:19:27]

Approved for R11 integration.

On 2011/03/22 00:13:36, petkov wrote:
> LGTM
> 
> http://codereview.chromium.org/6675014/diff/1/utility/crossystem_main.c
> File utility/crossystem_main.c (right):
> 
>
http://codereview.chromium.org/6675014/diff/1/utility/crossystem_main.c#newco...
> utility/crossystem_main.c:241: PrintHelp(progname);
> so this is not a warning but an error?