@@ -155,4 +155,7 @@ int qemu_opts_print(QemuOpts *opts);
int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
int abort_on_failure);
+QemuOptsList *qemu_opts_append(QemuOptsList *first, QemuOptsList *second);
+void qemu_opts_free(QemuOptsList *list);
+void qemu_opts_print_help(QemuOptsList *list);
#endif
@@ -1176,3 +1176,76 @@ int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
loc_pop(&loc);
return rc;
}
+
+static size_t count_opts_list(QemuOptsList *list)
+{
+ size_t i;
+
+ for (i = 0; list && list->desc[i].name; i++) {
+ ;
+ }
+
+ return i;
+}
+
+/* Create a new QemuOptsList with a desc of the merge of the first
+ * and second. It will allocate space for one new QemuOptsList plus
+ * enough space for QemuOptDesc in first and second QemuOptsList.
+ * First argument's QemuOptDesc members take precedence over second's.
+ * The result's name and implied_opt_name are not copied from them.
+ * Both merge_lists should not be set. Both lists can be NULL.
+ */
+QemuOptsList *qemu_opts_append(QemuOptsList *first,
+ QemuOptsList *second)
+{
+ size_t num_first_opts, num_second_opts;
+ QemuOptsList *dest = NULL;
+ int i;
+ int index = 0;
+ QemuOptsList *p = first;
+
+ num_first_opts = count_opts_list(first);
+ num_second_opts = count_opts_list(second);
+
+ dest = g_malloc0(sizeof(QemuOptsList)
+ + (num_first_opts + num_second_opts + 1) * sizeof(QemuOptDesc));
+
+ dest->name = "append_opts_list";
+ dest->implied_opt_name = NULL;
+ assert((!first || !first->merge_lists)
+ && (!second || !second->merge_lists));
+ QTAILQ_INIT(&dest->head);
+
+ for (i = 0; p && p->desc[i].name; i++) {
+ if (!find_desc_by_name(dest->desc, p->desc[i].name)) {
+ dest->desc[index].name = p->desc[i].name;
+ dest->desc[index].help = p->desc[i].help;
+ dest->desc[index].type = p->desc[i].type;
+ dest->desc[index].def_value_str = p->desc[i].def_value_str;
+ index++;
+ }
+ if (p == first && p && !p->desc[i].name) {
+ p = second;
+ i = 0;
+ }
+ }
+ dest->desc[index].name = NULL;
+ return dest;
+}
+
+/* free a QemuOptsList, can accept NULL as arguments */
+void qemu_opts_free(QemuOptsList *list)
+{
+ g_free(list);
+}
+
+void qemu_opts_print_help(QemuOptsList *list)
+{
+ int i;
+ printf("Supported options:\n");
+ for (i = 0; list && list->desc[i].name; i++) {
+ printf("%-16s %s\n", list->desc[i].name,
+ list->desc[i].help ?
+ list->desc[i].help : "No description available");
+ }
+}
This patch creates 4 functions, count_opts_list, qemu_opts_append, qemu_opts_free and qemu_opts_print_help, they are used in following commits. Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com> --- v16->v17: 1) fix indentation. 2) fix typo. v15->v16: 1) discard double-initialization. 2) use pointer directly, not g_strdup. v12->v13: 1) simply assert that neither argument has merge_lists set. 2) drop superfluous paranthesesis around p == first. v11->v12: 1) renmae functions. 2) fix loop styles and code styles. 3) qemu_opts_apend will not return NULL now. 4) merge_lists value is from arguments in qemu_opts_append. v6->v7: 1) Fix typo. v5->v6: 1) allocate enough space in append_opts_list function. include/qemu/option.h | 3 +++ util/qemu-option.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+)