options: support parsing values into substructs

Add an alternate mode for option parser objects (struct m_config)
which is not inherently tied to any particular instance of an option
value struct. Instead, this type or parsers can be used to initialize
defaults in or parse values into a struct given as a parameter. They
do not have the save slot functionality used for main player
configuration. The new functionality will be used to replace the
separate subopt_helper.c parsing code that is currently used to parse
per-object suboptions in VOs etc.

Previously, option default values were handled by initializing them in
external code before creating a parser. This initialization was done
with constants even for dynamically-allocated types like strings.
Because trying to free a pointer to a constant would cause a crash
when trying to replace the default with another value, parser
initialization code then replaced all the original defaults with
dynamically-allocated copies. This replace-with-copy behavior is no
longer supported for new-style options; instead the option definition
itself may contain a default value (new OPTDEF macros), and the new
function m_config_initialize() is used to set all options to their
default values. Convert the existing initialized dynamically allocated
options in main config (the string options --dumpfile, --term-osd-esc,
--input=conf) to use this. Other non-dynamic ones could be later
converted to use this style of initialization too.

There's currently no public call to free all dynamically allocated
options in a given option struct because I intend to use talloc
functionality for that (make them children of the struct and free with
it).

1 files changed, 1 insertions, 0 deletions

diff --git a/mplayer.c b/mplayer.c
index 5aa6f4cde0..5a2e7be1b3 100644
--- a/mplayer.c
+++ b/mplayer.c
@@ -3942,6 +3942,7 @@ int main(int argc, char *argv[])
     m_config_register_options(mpctx->mconfig, mplayer_opts);
     m_config_register_options(mpctx->mconfig, common_opts);
     mp_input_register_options(mpctx->mconfig);
+    m_config_initialize(mpctx->mconfig, opts);
 
     // Preparse the command line
     m_config_preparse_command_line(mpctx->mconfig, argc, argv, &verbose);