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From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 17 Apr 2018 07:56:37 -0700
Message-ID: <CAPcyv4g16niVJ+X73nSB9vHn3kNdc_X3ydZ1wy22AwVEp-1Rdw@mail.gmail.com>
Subject: Re: [PATCH 1/2] ndctl, util: add OPT_STRING_LIST to parse_option
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To: QI Fuli <qi.fuli@jp.fujitsu.com>
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On Mon, Apr 16, 2018 at 11:38 PM, QI Fuli <qi.fuli@jp.fujitsu.com> wrote:
> This patch adds OPT_STRING_LIST to parse_option in order to support
> multiple space seperated string objects in one option.
>
> Signed-off-by: QI Fuli <qi.fuli@jp.fujitsu.com>
> ---
>  ccan/list/list.h     |  6 ++++++
>  util/parse-options.c | 25 +++++++++++++++++++++++++
>  util/parse-options.h |  3 +++
>  3 files changed, 34 insertions(+)
>
> diff --git a/ccan/list/list.h b/ccan/list/list.h
> index 4d1d34e..f6c927f 100644
> --- a/ccan/list/list.h
> +++ b/ccan/list/list.h
> @@ -26,6 +26,12 @@ struct list_node
>         struct list_node *next, *prev;
>  };
>
> +struct string_list_node
> +{
> +       char *str;
> +       struct list_node list;
> +};
> +
>  /**
>   * struct list_head - the head of a doubly-linked list
>   * @h: the list_head (containing next and prev pointers)
> diff --git a/util/parse-options.c b/util/parse-options.c
> index 751c091..cac18f0 100644
> --- a/util/parse-options.c
> +++ b/util/parse-options.c
> @@ -20,6 +20,7 @@
>  #include <util/util.h>
>  #include <util/strbuf.h>
>  #include <util/parse-options.h>
> +#include <ccan/list/list.h>
>
>  #define OPT_SHORT 1
>  #define OPT_UNSET 2
> @@ -695,3 +696,27 @@ int parse_opt_verbosity_cb(const struct option *opt,
>         }
>         return 0;
>  }
> +
> +int parse_opt_string_list(const struct option *opt, const char *arg, int unset)
> +{
> +       if (unset)
> +               return 0;
> +
> +       if (!arg)
> +               return -1;
> +
> +       struct list_head *v = opt->value;
> +       char *temp = strdup(arg);
> +       const char *deli = " ";
> +
> +       temp = strtok(temp, deli);
> +       while (temp != NULL) {
> +               struct string_list_node *sln = malloc(sizeof(*sln));
> +               sln->str = temp;
> +               list_add_tail(v, &sln->list);
> +               temp = strtok(NULL, deli);
> +       }
> +
> +       free(temp);
> +       return 0;
> +}

As far as I can see we do not need to allocate a list or add this new
OPT_STRING_LIST argument type. Just teach the util_<object>_filter()
routines that the 'ident' argument may be a space delimited list.  See
the attached patch:
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