[U-Boot] [PATCH] cmd_itest.c: also support environment variables as arguments

[Wolfgang Denk <wd@denx.de>]

Dear Detlev Zundel,

In message <m2d3zstby2.fsf@ohwell.denx.de> you wrote:
> Hi Frans,
> 
> > Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
> > ---
> >  common/cmd_itest.c |    8 ++++++++
> >  1 files changed, 8 insertions(+), 0 deletions(-)
> >
> > diff --git a/common/cmd_itest.c b/common/cmd_itest.c
> > index 58c5e7b..78a4082 100644
> > --- a/common/cmd_itest.c
> > +++ b/common/cmd_itest.c
> > @@ -69,6 +69,10 @@ static long evalexp(char *s, int w)
> >  	long l = 0;
> >  	long *p;
> >  
> > +	/* if the parameter starts with a $ replace it with the environment value */
> > +	if (s[0] == '$') {
> > +		s = getenv(&s[1]);
> > +	}
> 
> This is actually a good idea, but I believe this does not work for the
> preferred ${variable} syntax, right?

... not to mention that it's fundamentally broken if the variable in
question is not an environment variable, but aplain hush shell
variable.

If you want variable subsitution, then please let the shell do this.
Don't reinvent the wheel.

Best regards,

Wolfgang Denk

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