m_config: add function to copy all options

Needed to copy the global option struct in the next commit.

2 files changed, 22 insertions, 1 deletions

diff --git a/options/m_config.c b/options/m_config.c
index 46af3446a3..852d4c194c 100644
--- a/options/m_config.c
+++ b/options/m_config.c
@@ -196,7 +196,8 @@ struct m_config *m_config_new(void *talloc_ctx, struct mp_log *log,
 {
     struct m_config *config = talloc(talloc_ctx, struct m_config);
     talloc_set_destructor(config, config_destroy);
-    *config = (struct m_config) {.log = log};
+    *config = (struct m_config)
+        {.log = log, .size = size, .defaults = defaults, .options = options};
     // size==0 means a dummy object is created
     if (size) {
         config->optstruct = talloc_zero_size(config, size);
@@ -907,6 +908,18 @@ void *m_sub_options_copy(void *talloc_ctx, const struct m_sub_options *opts,
     return new;
 }
 
+struct m_config *m_config_dup(void *talloc_ctx, struct m_config *config)
+{
+    struct m_config *new = m_config_new(talloc_ctx, config->log, config->size,
+                                        config->defaults, config->options);
+    assert(new->num_opts == config->num_opts);
+    for (int n = 0; n < new->num_opts; n++) {
+        assert(new->opts[n].opt->type == config->opts[n].opt->type);
+        m_option_copy(new->opts[n].opt, new->opts[n].data, config->opts[n].data);
+    }
+    return new;
+}
+
 // This is used for printing error messages on unknown options.
 static const char *const replaced_opts =
     "|a52drc#--ad-lavc-ac3drc=level"
diff --git a/options/m_config.h b/options/m_config.h
index eb255428e0..2a27dc69a6 100644
--- a/options/m_config.h
+++ b/options/m_config.h
@@ -55,6 +55,11 @@ typedef struct m_config {
     struct m_config_option *opts; // all options, even suboptions
     int num_opts;
 
+    // Creation parameters
+    size_t size;
+    const void *defaults;
+    const struct m_option *options;
+
     // List of defined profiles.
     struct m_profile *profiles;
     // Depth when recursively including profiles.
@@ -87,6 +92,9 @@ struct m_config *m_config_new(void *talloc_ctx, struct mp_log *log,
                               size_t size, const void *defaults,
                               const struct m_option *options);
 
+// (Warning: new object references config->log and others.)
+struct m_config *m_config_dup(void *talloc_ctx, struct m_config *config);
+
 struct m_config *m_config_from_obj_desc(void *talloc_ctx, struct mp_log *log,
                                         struct m_obj_desc *desc);