m_config: support auto-allocated sub-structs

Given your option struct has a field that is a pointer to another
struct, this commit allows you to declare options that write into that
other struct. The code in m_config will dereference the pointer field
on its own if such an option is accessed. If the field is NULL on
initialization of the containing m_config, the struct is automatically
allocated.

OPT_SUBSTRUCT() can be used to declare such a field.
struct m_sub_options is used to describe the pointed-to struct, and
includes size and defaults if the struct has to be allocated by
m_config.

1 files changed, 6 insertions, 0 deletions

diff --git a/m_config.h b/m_config.h
index beeab80a53..80897ce0e4 100644
--- a/m_config.h
+++ b/m_config.h
@@ -30,6 +30,7 @@
 typedef struct m_profile m_profile_t;
 struct m_option;
 struct m_option_type;
+struct m_sub_options;
 
 // Config option
 struct m_config_option {
@@ -38,6 +39,8 @@ struct m_config_option {
     char *name;
     // Option description.
     const struct m_option *opt;
+    // Raw value of the option.
+    void *data;
     // Raw value of the backup of the global value (or NULL).
     void *global_backup;
     // See \ref ConfigOptionFlags.
@@ -198,4 +201,7 @@ int m_config_set_profile_option(struct m_config *config, struct m_profile *p,
  */
 void m_config_set_profile(struct m_config *config, struct m_profile *p);
 
+void *m_config_alloc_struct(void *talloc_parent,
+                            const struct m_sub_options *subopts);
+
 #endif /* MPLAYER_M_CONFIG_H */