[U-Boot-Users] [patch #10/11] HUSH parser fixes.

[Pantelis Antoniou]

Hello

The following patch fixes various shortcomings in the
hush parser.

1. A new test command was added. This is a simplified
   version of the one in the sh shell.

2. A new exit command was added which terminates the
   current executing script.

3. Handing of $? (exit code of last executed command), was
   wrong. Instead of being evaluated in the proper place
   it was evaluated once at the start of the evaluation.

   For example the following script worked like this.

   test 1 -eq 2   # set $? to 1
   echo $?        # outputs 1
   test 1 -eq 1   # set $? to 0
   echo $?        # still outputs 1

   Now it is fixed.

4. The simplified parser uses '(' and ')' for enclosing variables.
   This caused problems when migrating to hush because hash uses
   '{' and '}'. Modified to accept parentheses too.
 
Regards

Pantelis

  
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