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[Qemu-devel] [PATCH V17 2/9] qemu-option: avoid duplication of default v
From: |
Dong Xu Wang |
Subject: |
[Qemu-devel] [PATCH V17 2/9] qemu-option: avoid duplication of default value in QemuOpts |
Date: |
Wed, 17 Jul 2013 17:29:41 +0800 |
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 <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Dong Xu Wang <address@hidden>
---
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 be5dfaa..86cc64e 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -495,9 +495,31 @@ 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;
}
@@ -516,9 +538,17 @@ 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;
}
@@ -526,9 +556,17 @@ 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;
}
@@ -536,9 +574,17 @@ 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;
}
@@ -579,20 +625,6 @@ 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
- [Qemu-devel] [PATCH V17 1/9] qemu-option: add def_value_str in QemuOptDesc struct and rewrite qemu_opts_print, (continued)
- [Qemu-devel] [PATCH V17 1/9] qemu-option: add def_value_str in QemuOptDesc struct and rewrite qemu_opts_print, Dong Xu Wang, 2013/07/17
- [Qemu-devel] [PATCH V17 3/9] qemu-option: create four QemuOptsList related functions, Dong Xu Wang, 2013/07/17
- [Qemu-devel] [PATCH V17 9/9] qemu-option: use qemu_opts_del without judging NULL, Dong Xu Wang, 2013/07/17
- [Qemu-devel] [PATCH V17 4/9] qemu-option: create some QemuOpts functons, Dong Xu Wang, 2013/07/17
- [Qemu-devel] [PATCH V17 7/9] qemu-option: remove QEMUOptionParameter related functions and struct, Dong Xu Wang, 2013/07/17
- [Qemu-devel] [PATCH V17 8/9] qemu-option: make qemu_opts_del accept opts being NULL, Dong Xu Wang, 2013/07/17
- [Qemu-devel] [PATCH V17 5/9] block: use QemuOpts support in block layer, Dong Xu Wang, 2013/07/17
- [Qemu-devel] [PATCH V17 2/9] qemu-option: avoid duplication of default value in QemuOpts,
Dong Xu Wang <=
- [Qemu-devel] [PATCH V17 6/9] qapi: query-command-line-options outputs def_value_str, Dong Xu Wang, 2013/07/17
- Re: [Qemu-devel] [PATCH V17 0/9] replace QEMUOptionParameter with QemuOpts parser, Eric Blake, 2013/07/17