[Qemu-devel] [PATCH v27 09/33] QemuOpts: add conversion between QEMUOptionParameter to QemuOpts

[Chunyan Liu <cyliu@suse.com>]

Add two temp conversion functions between QEMUOptionParameter to QemuOpts,
so that next patch can use it. It will simplify later patch for easier
review. And will be finally removed after all backend drivers switch to
QemuOpts.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Leandro Dorileo <l@dorileo.org>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
---
 include/qemu/option.h |   9 +++
 util/qemu-option.c    | 153 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 162 insertions(+)

diff --git a/include/qemu/option.h b/include/qemu/option.h
index fbf5dc2..e98e8ef 100644
--- a/include/qemu/option.h
+++ b/include/qemu/option.h
@@ -103,6 +103,12 @@ typedef struct QemuOptDesc {
 } QemuOptDesc;
 
 struct QemuOptsList {
+    /* FIXME: Temp used for QEMUOptionParamter->QemuOpts conversion to
+     * indicate the need to free memory. Will remove after all drivers
+     * switch to QemuOpts.
+     */
+    bool allocated;
+
     const char *name;
     const char *implied_opt_name;
     bool merge_lists;  /* Merge multiple uses of option into a single list? */
@@ -167,5 +173,8 @@ void qemu_opts_print(QemuOpts *opts);
 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
                       int abort_on_failure);
 void qemu_opts_print_help(QemuOptsList *list);
+void qemu_opts_free(QemuOptsList *list);
+QEMUOptionParameter *opts_to_params(QemuOpts *opts);
+QemuOptsList *params_to_opts(QEMUOptionParameter *list);
 
 #endif
diff --git a/util/qemu-option.c b/util/qemu-option.c
index adb7c3c..93ffcd5 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -1345,3 +1345,156 @@ 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)
+{
+    QemuOptDesc *desc = NULL;
+    size_t num_opts = 0;
+
+    if (!list) {
+        return 0;
+    }
+
+    desc = list->desc;
+    while (desc && desc->name) {
+        num_opts++;
+        desc++;
+    }
+
+    return num_opts;
+}
+
+/* Convert QEMUOptionParameter to QemuOpts
+ * FIXME: this function will be removed after all drivers
+ * switch to QemuOpts
+ */
+QemuOptsList *params_to_opts(QEMUOptionParameter *list)
+{
+    QemuOptsList *opts = NULL;
+    size_t num_opts, i = 0;
+
+    if (!list) {
+        return NULL;
+    }
+
+    num_opts = count_option_parameters(list);
+    opts = g_malloc0(sizeof(QemuOptsList) +
+                     (num_opts + 1) * sizeof(QemuOptDesc));
+    QTAILQ_INIT(&opts->head);
+    /* (const char *) members will point to malloced space and need to free */
+    opts->allocated = true;
+
+    while (list && list->name) {
+        opts->desc[i].name = g_strdup(list->name);
+        opts->desc[i].help = g_strdup(list->help);
+        switch (list->type) {
+        case OPT_FLAG:
+            opts->desc[i].type = QEMU_OPT_BOOL;
+            opts->desc[i].def_value_str =
+                g_strdup(list->value.n ? "on" : "off");
+            break;
+
+        case OPT_NUMBER:
+            opts->desc[i].type = QEMU_OPT_NUMBER;
+            if (list->value.n) {
+                opts->desc[i].def_value_str =
+                    g_strdup_printf("%" PRIu64, list->value.n);
+            }
+            break;
+
+        case OPT_SIZE:
+            opts->desc[i].type = QEMU_OPT_SIZE;
+            if (list->value.n) {
+                opts->desc[i].def_value_str =
+                    g_strdup_printf("%" PRIu64, list->value.n);
+            }
+            break;
+
+        case OPT_STRING:
+            opts->desc[i].type = QEMU_OPT_STRING;
+            opts->desc[i].def_value_str = g_strdup(list->value.s);
+            break;
+        }
+
+        i++;
+        list++;
+    }
+
+    return opts;
+}
+
+/* convert QemuOpts to QEMUOptionParameter
+ * Note: result QEMUOptionParameter has shorter lifetime than
+ * input QemuOpts.
+ * FIXME: this function will be removed after all drivers
+ * switch to QemuOpts
+ */
+QEMUOptionParameter *opts_to_params(QemuOpts *opts)
+{
+    QEMUOptionParameter *dest = NULL;
+    QemuOptDesc *desc;
+    size_t num_opts, i = 0;
+    const char *tmp;
+
+    if (!opts || !opts->list || !opts->list->desc) {
+        return NULL;
+    }
+    assert(!opts_accepts_any(opts));
+
+    num_opts = count_opts_list(opts->list);
+    dest = g_malloc0((num_opts + 1) * sizeof(QEMUOptionParameter));
+
+    desc = opts->list->desc;
+    while (desc && desc->name) {
+        dest[i].name = desc->name;
+        dest[i].help = desc->help;
+        dest[i].assigned = qemu_opt_find(opts, desc->name) ? true : false;
+        switch (desc->type) {
+        case QEMU_OPT_STRING:
+            dest[i].type = OPT_STRING;
+            tmp = qemu_opt_get(opts, desc->name);
+            dest[i].value.s = g_strdup(tmp);
+            break;
+
+        case QEMU_OPT_BOOL:
+            dest[i].type = OPT_FLAG;
+            dest[i].value.n = qemu_opt_get_bool(opts, desc->name, 0) ? 1 : 0;
+            break;
+
+        case QEMU_OPT_NUMBER:
+            dest[i].type = OPT_NUMBER;
+            dest[i].value.n = qemu_opt_get_number(opts, desc->name, 0);
+            break;
+
+        case QEMU_OPT_SIZE:
+            dest[i].type = OPT_SIZE;
+            dest[i].value.n = qemu_opt_get_size(opts, desc->name, 0);
+            break;
+        }
+
+        i++;
+        desc++;
+    }
+
+    return dest;
+}
+
+void qemu_opts_free(QemuOptsList *list)
+{
+    /* List members point to new malloced space and need to be freed.
+     * FIXME:
+     * Introduced for QEMUOptionParamter->QemuOpts conversion.
+     * Will remove after all drivers switch to QemuOpts.
+     */
+    if (list && list->allocated) {
+        QemuOptDesc *desc = list->desc;
+        while (desc && desc->name) {
+            g_free((char *)desc->name);
+            g_free((char *)desc->help);
+            g_free((char *)desc->def_value_str);
+            desc++;
+        }
+    }
+
+    g_free(list);
+}
-- 
1.7.12.4