Re: [Qemu-devel] [PATCH v24 02/31] QemuOpts: add def_value_str to QemuOptDesc

[Leandro Dorileo]

On Thu, Apr 03, 2014 at 05:54:20PM +0800, Chunyan Liu wrote:
> Add def_value_str (default value) to QemuOptDesc, to replace function of the
> default value in QEMUOptionParameter.
> 
> Improve qemu_opts_get_* functions: if find opt, return opt->str; otherwise,
> if desc->def_value_str is set, return desc->def_value_str; otherwise, return
> input defval.
> 
> Improve qemu_opts_print: if option is set, print opt->str; otherwise, if
> desc->def_value_str is set, also print it.
> 
> Reviewed-by: Eric Blake <address@hidden>
> Signed-off-by: Dong Xu Wang <address@hidden>
> Signed-off-by: Chunyan Liu <address@hidden>
> ---
>  include/qemu/option.h |  3 ++-
>  util/qemu-option.c    | 56 
> ++++++++++++++++++++++++++++++++++++++++++---------
>  2 files changed, 49 insertions(+), 10 deletions(-)
> 
> diff --git a/include/qemu/option.h b/include/qemu/option.h
> index 8c0ac34..c3b0a91 100644
> --- a/include/qemu/option.h
> +++ b/include/qemu/option.h
> @@ -99,6 +99,7 @@ typedef struct QemuOptDesc {
>      const char *name;
>      enum QemuOptType type;
>      const char *help;
> +    const char *def_value_str;
>  } QemuOptDesc;


I still think you don't need to define the default value as a string to later
parse it, see what I mean 
https://lists.gnu.org/archive/html/qemu-devel/2014-03/msg04273.html

But I think we can live with it. See bellow, if you fix the issue you can add 
my Reviewed-by.


>  
>  struct QemuOptsList {
> @@ -156,7 +157,7 @@ QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict);
>  void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp);
>  
>  typedef int (*qemu_opts_loopfunc)(QemuOpts *opts, void *opaque);
> -int qemu_opts_print(QemuOpts *opts, void *dummy);
> +void qemu_opts_print(QemuOpts *opts);
>  int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void 
> *opaque,
>                        int abort_on_failure);
>  
> diff --git a/util/qemu-option.c b/util/qemu-option.c
> index e6d10bc..d5e80da 100644
> --- a/util/qemu-option.c
> +++ b/util/qemu-option.c
> @@ -570,6 +570,13 @@ static QemuOpt *qemu_opt_find(QemuOpts *opts, const char 
> *name)
>  const char *qemu_opt_get(QemuOpts *opts, const char *name)
>  {
>      QemuOpt *opt = qemu_opt_find(opts, name);
> +
> +    if (!opt) {
> +        const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
> +        if (desc && desc->def_value_str) {
> +            return desc->def_value_str;
> +        }
> +    }
>      return opt ? opt->str : NULL;
>  }
>  
> @@ -589,8 +596,13 @@ bool qemu_opt_get_bool(QemuOpts *opts, const char *name, 
> bool defval)
>  {
>      QemuOpt *opt = qemu_opt_find(opts, name);
>  
> -    if (opt == NULL)
> +    if (opt == NULL) {
> +        const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
> +        if (desc && desc->def_value_str) {
> +            parse_option_bool(name, desc->def_value_str, &defval, 
> &error_abort);
> +        }
>          return defval;
> +    }
>      assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
>      return opt->value.boolean;
>  }
> @@ -599,8 +611,14 @@ uint64_t qemu_opt_get_number(QemuOpts *opts, const char 
> *name, uint64_t defval)
>  {
>      QemuOpt *opt = qemu_opt_find(opts, name);
>  
> -    if (opt == NULL)
> +    if (opt == NULL) {
> +        const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
> +        if (desc && desc->def_value_str) {
> +            parse_option_number(name, desc->def_value_str, &defval,
> +                                &error_abort);
> +        }
>          return defval;
> +    }
>      assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
>      return opt->value.uint;
>  }
> @@ -609,8 +627,13 @@ uint64_t qemu_opt_get_size(QemuOpts *opts, const char 
> *name, uint64_t defval)
>  {
>      QemuOpt *opt = qemu_opt_find(opts, name);
>  
> -    if (opt == NULL)
> +    if (opt == NULL) {
> +        const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
> +        if (desc && desc->def_value_str) {
> +            parse_option_size(name, desc->def_value_str, &defval, 
> &error_abort);
> +        }
>          return defval;
> +    }
>      assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
>      return opt->value.uint;
>  }
> @@ -895,17 +918,32 @@ void qemu_opts_del(QemuOpts *opts)
>      g_free(opts);
>  }
>  
> -int qemu_opts_print(QemuOpts *opts, void *dummy)
> +void qemu_opts_print(QemuOpts *opts)
>  {
>      QemuOpt *opt;
> +    QemuOptDesc *desc = opts->list->desc;
>  
> -    fprintf(stderr, "%s: %s:", opts->list->name,
> -            opts->id ? opts->id : "<noid>");
> -    QTAILQ_FOREACH(opt, &opts->head, next) {
> -        fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
> +    if (desc[0].name == NULL) {
> +        QTAILQ_FOREACH(opt, &opts->head, next) {
> +            fprintf(stderr, "%s=\"%s\" ", opt->name, opt->str);
> +        }
> +        return;
> +    }
> +    for (; desc && desc->name; desc++) {
> +        const char *value;
> +        QemuOpt *opt = qemu_opt_find(opts, desc->name);
> +
> +        value = opt ? opt->str : desc->def_value_str;
> +        if (!value) {
> +            continue;
> +        }
> +        if (desc->type == QEMU_OPT_STRING) {
> +            fprintf(stderr, "%s='%s' ", desc->name, value);
> +        } else {
> +            fprintf(stderr, "%s=%s ", desc->name, value);
> +        }
>      }
>      fprintf(stderr, "\n");



I see you removed this fprintf() in the commit 
afe65f5c92694d551aaebc128233b623e8665d5e
Please do this change in this commit and avoid breaking the block tests in
further commits.

-- 
Leandro Dorileo

> -    return 0;
>  }
>  
>  static int opts_do_parse(QemuOpts *opts, const char *params,
> -- 
> 1.7.12.4
>