This patch moves the default value entirely to QemuOptDesc.
When getting the value of an option that hasn't been set, and
QemuOptDesc has a default value, return that. Else, behave as
before.
Example: qemu_opt_get_number(opts, "foo", 42)
If "foo" has been set in opts, return its value.
Else, if opt's QemuOptDesc has a default value for "foo", return
that.
Else, return 42.
Note that the last argument is useless when QemuOptDesc has a
default value. Ugly. If it bothers us, we could assert.
Example: qemu_opt_get(opts, "bar")
If "bar" has been set in opts, return its value.
Else, if opt's QemuOptDesc has a default value for "bar", return
that.
Else, return NULL.
Signed-off-by: Dong Xu Wang <wdon...@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <ebl...@redhat.com>
---
v13->v14:
1) change code style.
2) assert errors.
util/qemu-option.c | 66 ++++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 49 insertions(+), 17 deletions(-)
diff --git a/util/qemu-option.c b/util/qemu-option.c
index 84d8c8b..bd2acdc 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -525,9 +525,31 @@ static QemuOpt *qemu_opt_find(QemuOpts *opts, const char
*name)
return NULL;
}
+static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
+ const char *name)
+{
+ int i;
+
+ for (i = 0; desc[i].name != NULL; i++) {
+ if (strcmp(desc[i].name, name) == 0) {
+ return &desc[i];
+ }
+ }
+
+ return NULL;
+}
+
const char *qemu_opt_get(QemuOpts *opts, const char *name)
{
QemuOpt *opt = qemu_opt_find(opts, name);
+ const QemuOptDesc *desc;
+
+ if (!opt) {
+ 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;
}
@@ -546,9 +568,17 @@ bool qemu_opt_has_help_opt(QemuOpts *opts)
bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
{
QemuOpt *opt = qemu_opt_find(opts, name);
+ const QemuOptDesc *desc;
+ Error *local_err = NULL;
- if (opt == NULL)
+ if (opt == NULL) {
+ desc = find_desc_by_name(opts->list->desc, name);
+ if (desc && desc->def_value_str) {
+ parse_option_bool(name, desc->def_value_str, &defval, &local_err);
+ assert(!local_err);
+ }
return defval;
+ }
assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
return opt->value.boolean;
}
@@ -556,9 +586,17 @@ bool qemu_opt_get_bool(QemuOpts *opts, const char *name,
bool defval)
uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
{
QemuOpt *opt = qemu_opt_find(opts, name);
+ const QemuOptDesc *desc;
+ Error *local_err = NULL;
- if (opt == NULL)
+ if (opt == NULL) {
+ desc = find_desc_by_name(opts->list->desc, name);
+ if (desc && desc->def_value_str) {
+ parse_option_number(name, desc->def_value_str, &defval,
&local_err);
+ assert(!local_err);
+ }
return defval;
+ }
assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
return opt->value.uint;
}
@@ -566,9 +604,17 @@ uint64_t qemu_opt_get_number(QemuOpts *opts, const char
*name, uint64_t defval)
uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
{
QemuOpt *opt = qemu_opt_find(opts, name);
+ const QemuOptDesc *desc;
+ Error *local_err = NULL;
- if (opt == NULL)
+ if (opt == NULL) {
+ desc = find_desc_by_name(opts->list->desc, name);
+ if (desc && desc->def_value_str) {
+ parse_option_size(name, desc->def_value_str, &defval, &local_err);
+ assert(!local_err);
+ }
return defval;
+ }
assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
return opt->value.uint;
}
@@ -609,20 +655,6 @@ static bool opts_accepts_any(const QemuOpts *opts)
return opts->list->desc[0].name == NULL;
}
-static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
- const char *name)
-{
- int i;
-
- for (i = 0; desc[i].name != NULL; i++) {
- if (strcmp(desc[i].name, name) == 0) {
- return &desc[i];
- }
- }
-
- return NULL;
-}
-
static void opt_set(QemuOpts *opts, const char *name, const char *value,
bool prepend, Error **errp)
{
--
1.7.11.7
