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implementing eval command


I'd like to make a patch that implements eval command, as follows.
I have following idea to implement eval simply:
Syntax of eval will be similar to the syntax of 'printf' command:
         eval "string with %..." comma-separated-expressions
Implementation relies on existing printf_command() function,
by rewriting printf_command into pair of functions, one that computes
result of printf as allocated string; both printf_command and eval_command
will use compute_printf() function.
What do you think ?

Yakov


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