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util: add iterators for QemuOpts values

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To iterate over all QemuOpts currently requires using a callback
function which is inconvenient for control flow. Add support for
using iterator functions more directly

  QemuOptsIter iter;
  QemuOpt *opt;

  qemu_opts_iter_init(&iter, opts, "repeated-key");
  while ((opt = qemu_opts_iter_next(&iter)) != NULL) {
      ....do something...
  }

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170203120649.15637-8-berrange@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Daniel P. Berrange 2017-02-03 12:06:48 +00:00 • committed by Gerd Hoffmann
parent 57a6d6d538
commit e998e2090f
2 changed files with 28 additions and 0 deletions
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19
util/qemu-option.c
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@ -332,6 +332,25 @@ const char *qemu_opt_get(QemuOpts *opts, const char *name)
return opt ? opt->str : NULL;
}
void qemu_opt_iter_init(QemuOptsIter *iter, QemuOpts *opts, const char *name)
{
iter->opts = opts;
iter->opt = QTAILQ_FIRST(&opts->head);
iter->name = name;
}
const char *qemu_opt_iter_next(QemuOptsIter *iter)
{
QemuOpt *ret = iter->opt;
if (iter->name) {
while (ret && !g_str_equal(iter->name, ret->name)) {
ret = QTAILQ_NEXT(ret, next);
}
}
iter->opt = ret ? QTAILQ_NEXT(ret, next) : NULL;
return ret ? ret->str : NULL;
}
/* Get a known option (or its default) and remove it from the list
* all in one action. Return a malloced string of the option value.
* Result must be freed by caller with g_free().