[U-Boot] [PATCH v4 7/7] env: delete selected vars not present in imported env

[Marek Vasut <marek.vasut@gmail.com>]

Dear Gerlando Falauto,

> On 08/24/2012 04:58 PM, Marek Vasut wrote:
> > Dear Gerlando Falauto,
> > 
> >> When variables explicitly specified on the command line are not present
> >> in the imported env, delete them from the running env.
> >> If the variable is also missing from the running env, issue a warning.
> >> 
> >> Signed-off-by: Gerlando Falauto<gerlando.falauto@keymile.com>
> > 
> > Whew! I made it through ... it wasn't that scary in the end ;-)
> > 
> >> ---
> >> 
> >>   lib/hashtable.c |   48
> >>   +++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 41
> >>   insertions(+), 7 deletions(-)
> >> 
> >> diff --git a/lib/hashtable.c b/lib/hashtable.c
> >> index f3f47de..b3d0b64 100644
> >> --- a/lib/hashtable.c
> >> +++ b/lib/hashtable.c
> >> @@ -607,22 +607,32 @@ ssize_t hexport_r(struct hsearch_data *htab, const
> >> char sep, * himport()
> >> 
> >>    */
> >> 
> >> -/* Check whether variable name is amongst vars[] */
> >> -static int is_var_in_set(const char *name, int nvars, char * const
> >> vars[]) +/*
> >> + * Check whether variable 'name' is amongst vars[],
> >> + * and remove all instances by setting the pointer to NULL
> >> + */
> >> +static int is_var_in_set(const char *name, int nvars, char * vars[])
> >> 
> >>   {
> >>   
> >>   	int i = 0;
> >> 
> >> +	int res = 0;
> >> 
> >>   	/* No variables specified means process all of them */
> >>   	if (nvars == 0)
> >>   	
> >>   		return 1;
> >>   	
> >>   	for (i = 0; i<  nvars; i++) {
> >> 
> >> -		if (!strcmp(name, vars[i]))
> >> -			return 1;
> >> +		if (vars[i] == NULL)
> >> +			continue;
> >> +		/* If we found it, delete all of them */
> >> +		if (!strcmp(name, vars[i])) {
> >> +			vars[i] = NULL;
> >> +			res = 1;
> > 
> > break here ?
> 
> Nope, if we find it, we should delete all of them (see comment above).

Stupid me, of course now I see the logic! Sorry!

> >> +		}
> >> 
> >>   	}
> >> 
> >> -	debug("Skipping non-listed variable %s\n", name);
> >> +	if (!res)
> >> +		debug("Skipping non-listed variable %s\n", name);
> >> 
> >> -	return 0;
> >> +	return res;
> >> 
> >>   }
> >>   
> >>   /*
> >> 
> >> @@ -662,9 +672,11 @@ static int is_var_in_set(const char *name, int
> >> nvars, char * const vars[])
> >> 
> >>   int himport_r(struct hsearch_data *htab,
> >>   
> >>   		const char *env, size_t size, const char sep, int flag,
> >> 
> >> -		int nvars, char * const vars[], int do_apply)
> >> +		int nvars, char * const __vars[], int do_apply)
> > 
> > Two underscores are reserved, use something else ;-)
> 
> Like... one? three? ;-)

I think one is the way to go ... http://lwn.net/Articles/509149/ definitelly not 
like this ;-)

[...]


Best regards,
Marek Vasut