[U-Boot] [PATCH v3 2/6] env: make himport_r() selective on variables

[Marek Vasut <marex@denx.de>]

Dear Gerlando Falauto,

> Add 2 new arguments to himport_r():
> 
>  o "nvars", "vars": number and list of variables to take into account
>    (0 means ALL)
> 

Looks nice and clean. But man, these patches are tough to review (not because 
you made bad job, just because they're hard code), lot of headache from them ;-)

> NOTE: This patch does not change the current behaviour.
> 
> Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
> ---
>  common/cmd_nvedit.c |    3 ++-
>  common/env_common.c |    6 ++++--
>  include/search.h    |    6 +++++-
>  lib/hashtable.c     |   27 ++++++++++++++++++++++++++-
>  4 files changed, 37 insertions(+), 5 deletions(-)
> 
> diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
> index e762e76..59668a6 100644
> --- a/common/cmd_nvedit.c
> +++ b/common/cmd_nvedit.c
> @@ -930,7 +930,8 @@ static int do_env_import(cmd_tbl_t *cmdtp, int flag,
>  		addr = (char *)ep->data;
>  	}
> 
> -	if (himport_r(&env_htab, addr, size, sep, del ? 0 : H_NOCLEAR) == 0) {
> +	if (himport_r(&env_htab, addr, size, sep, del ? 0 : H_NOCLEAR,
> +			0, NULL) == 0) {
>  		error("Environment import failed: errno = %d\n", errno);
>  		return 1;
>  	}
> diff --git a/common/env_common.c b/common/env_common.c
> index c33d22d..a93c062 100644
> --- a/common/env_common.c
> +++ b/common/env_common.c
> @@ -182,7 +182,8 @@ void set_default_env(const char *s)
>  	}
> 
>  	if (himport_r(&env_htab, (char *)default_environment,
> -			sizeof(default_environment), '\0', 0) == 0)
> +			sizeof(default_environment), '\0', 0,
> +			0, NULL) == 0)
>  		error("Environment import failed: errno = %d\n", errno);
> 
>  	gd->flags |= GD_FLG_ENV_READY;
> @@ -207,7 +208,8 @@ int env_import(const char *buf, int check)
>  		}
>  	}
> 
> -	if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0)) {
> +	if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0,
> +			0, NULL)) {
>  		gd->flags |= GD_FLG_ENV_READY;
>  		return 1;
>  	}
> diff --git a/include/search.h b/include/search.h
> index a4a5ef4..94d75fc 100644
> --- a/include/search.h
> +++ b/include/search.h
> @@ -94,9 +94,13 @@ extern ssize_t hexport_r(struct hsearch_data *__htab,
>  		     const char __sep, char **__resp, size_t __size,
>  		     int argc, char * const argv[]);
> 
> +/*
> + * nvars: length of vars array
> + * vars: array of strings (variable names) to import (nvars == 0 means
> all) + */
>  extern int himport_r(struct hsearch_data *__htab,
>  		     const char *__env, size_t __size, const char __sep,
> -		     int __flag);
> +		     int __flag, int nvars, char * const vars[]);
> 
>  /* Flags for himport_r() */
>  #define	H_NOCLEAR	(1 << 0) /* do not clear hash table before 
importing */
> diff --git a/lib/hashtable.c b/lib/hashtable.c
> index abd61c8..0610e86 100644
> --- a/lib/hashtable.c
> +++ b/lib/hashtable.c
> @@ -603,6 +603,24 @@ 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[])
> +{
> +	int i = 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;
> +	}
> +	debug("Skipping non-listed variable %s\n", name);
> +
> +	return 0;
> +}
> +
>  /*
>   * Import linearized data into hash table.
>   *
> @@ -639,7 +657,8 @@ ssize_t hexport_r(struct hsearch_data *htab, const char
> sep, */
> 
>  int himport_r(struct hsearch_data *htab,
> -	      const char *env, size_t size, const char sep, int flag)
> +		const char *env, size_t size, const char sep, int flag,
> +		int nvars, char * const vars[])
>  {
>  	char *data, *sp, *dp, *name, *value;
> 
> @@ -726,6 +745,8 @@ int himport_r(struct hsearch_data *htab,
>  			*dp++ = '\0';	/* terminate name */
> 
>  			debug("DELETE CANDIDATE: \"%s\"\n", name);
> +			if (!is_var_in_set(name, nvars, vars))
> +				continue;
> 
>  			if (hdelete_r(name, htab) == 0)
>  				debug("DELETE ERROR 
##############################\n");
> @@ -743,6 +764,10 @@ int himport_r(struct hsearch_data *htab,
>  		*sp++ = '\0';	/* terminate value */
>  		++dp;
> 
> +		/* Skip variables which are not supposed to be processed */
> +		if (!is_var_in_set(name, nvars, vars))
> +			continue;
> +
>  		/* enter into hash table */
>  		e.key = name;
>  		e.data = value;