This helper function is used to extract specific QemuOpts item from an
existing QemuOptsList which matches specific patterns.
Signed-off-by: Peter Xu <pet...@redhat.com>
---
include/qemu/option.h | 2 ++
util/qemu-option.c | 24 ++++++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/include/qemu/option.h b/include/qemu/option.h
index f7338db..355cee8 100644
--- a/include/qemu/option.h
+++ b/include/qemu/option.h
@@ -136,6 +136,8 @@ void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict,
Error **errp);
typedef int (*qemu_opts_loopfunc)(void *opaque, QemuOpts *opts, Error **errp);
int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
void *opaque, Error **errp);
+QemuOpts *qemu_opts_extract(QemuOptsList *list, qemu_opts_loopfunc func,
+ void *opaque, Error **errp);
void qemu_opts_print(QemuOpts *opts, const char *sep);
void qemu_opts_print_help(QemuOptsList *list);
void qemu_opts_free(QemuOptsList *list);
diff --git a/util/qemu-option.c b/util/qemu-option.c
index 5ce1b5c..7c34d88 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -1121,6 +1121,30 @@ int qemu_opts_foreach(QemuOptsList *list,
qemu_opts_loopfunc func,
return rc;
}
+/*
+ * Extract specific QemuOpts from a QemuOptsList. For each QemuOpts
+ * item, if checks against func() returns zero, it'll be picked out
+ * from current QemuOptsList, then returned. If there are more than
+ * one QemuOpts that match the check, will only return the first one
+ * found.
+ */
+QemuOpts *qemu_opts_extract(QemuOptsList *list, qemu_opts_loopfunc func,
+ void *opaque, Error **errp)
+{
+ QemuOpts *opts, *next_opts;
+
+ assert(list && func);
+
+ QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
+ if (func(opaque, opts, errp) == 0) {
+ QTAILQ_REMOVE(&list->head, opts, next);
+ return opts;
+ }
+ }
+
+ return NULL;
+}
+
static size_t count_opts_list(QemuOptsList *list)
{
QemuOptDesc *desc = NULL;
--
2.7.4
