[Qemu-devel] Re: [PATCH 45/50] qemu-option: Functions to convert to/from QDict

[Luiz Capitulino <lcapitulino@redhat.com>]

On Thu,  4 Mar 2010 16:57:06 +0100
Markus Armbruster <armbru@redhat.com> wrote:

> The functions are somewhat restricted.  Good enough for the job at
> hand.  We'll extend them when we need more.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  qemu-option.c |   79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  qemu-option.h |    3 ++
>  2 files changed, 82 insertions(+), 0 deletions(-)
> 
> diff --git a/qemu-option.c b/qemu-option.c
> index ab488e4..24bb19b 100644
> --- a/qemu-option.c
> +++ b/qemu-option.c
> @@ -28,6 +28,7 @@
>  
>  #include "qemu-common.h"
>  #include "qemu-error.h"
> +#include "qemu-objects.h"
>  #include "qemu-option.h"
>  
>  /*
> @@ -777,6 +778,84 @@ QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params, const char *fi
>      return opts;
>  }
>  
> +static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
> +{
> +    char buf[32];
> +    const char *value;
> +    int n;
> +
> +    if (!strcmp(key, "id")) {
> +        return;
> +    }
> +
> +    switch (qobject_type(obj)) {
> +    case QTYPE_QSTRING:
> +        value = qstring_get_str(qobject_to_qstring(obj));
> +        break;
> +    case QTYPE_QINT:
> +        n = snprintf(buf, sizeof(buf), "%" PRId64,
> +                     qint_get_int(qobject_to_qint(obj)));
> +        assert(n < sizeof(buf));
> +        value = buf;
> +        break;
> +    case QTYPE_QFLOAT:
> +        n = snprintf(buf, sizeof(buf), "%.17g",
> +                     qfloat_get_double(qobject_to_qfloat(obj)));
> +        assert(n < sizeof(buf));
> +        value = buf;
> +        break;
> +    case QTYPE_QBOOL:
> +        strcpy(buf, qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
> +        value = buf;
> +        break;
> +    default:
> +        return;
> +    }
> +    qemu_opt_set(opaque, key, value);
> +}
> +
> +/*
> + * Create QemuOpts from a QDict.
> + * Use value of key "id" as ID if it exists and is a QString.
> + * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
> + * other types are silently ignored.
> + */
> +QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict)
> +{
> +    QemuOpts *opts;
> +
> +    opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1);
> +    if (opts == NULL)
> +        return NULL;
> +
> +    qdict_iter(qdict, qemu_opts_from_qdict_1, opts);
> +    return opts;
> +}
> +
> +/*
> + * Convert from QemuOpts to QDict.
> + * The QDict values are of type QString.
> + * TODO We'll want to use types appropriate for opt->desc->type, but
> + * this is enough for now.
> + */
> +QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
> +{
> +    QemuOpt *opt;
> +    QObject *val;
> +
> +    if (!qdict) {
> +        qdict = qdict_new();
> +    }
> +    if (opts->id) {
> +        qdict_put(qdict, "id", qstring_from_str(opts->id));
> +    }
> +    QTAILQ_FOREACH(opt, &opts->head, next) {
> +        val = QOBJECT(qstring_from_str(opt->str));
> +        qdict_put_obj(qdict, opt->name, val);
> +    }

 Why not just do:

qdict_put(qdict, opt->name, qstring_from_str(opt->str));

> +    return qdict;
> +}
> +
>  /* Validate parsed opts against descriptions where no
>   * descriptions were provided in the QemuOptsList.
>   */
> diff --git a/qemu-option.h b/qemu-option.h
> index f3f1de7..d735386 100644
> --- a/qemu-option.h
> +++ b/qemu-option.h
> @@ -28,6 +28,7 @@
>  
>  #include <stdint.h>
>  #include "qemu-queue.h"
> +#include "qdict.h"
>  
>  enum QEMUOptionParType {
>      OPT_FLAG,
> @@ -118,6 +119,8 @@ void qemu_opts_del(QemuOpts *opts);
>  int qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc);
>  int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname);
>  QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params, const char *firstname);
> +QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict);
> +QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict);
>  
>  typedef int (*qemu_opts_loopfunc)(QemuOpts *opts, void *opaque);
>  int qemu_opts_print(QemuOpts *opts, void *dummy);