Peter Rajnoha e29cd366a2 config: add support for enhanced config node output ... There's a possibility to interconnect the dm_config_node with an ID, which in our case is used to reference the configuration definition ID from config_settings.h. So simply interconnecting struct dm_config_node with struct cfg_def_item. This patch also adds support for enhanced config node output besides existing "output line by line". This patch adds a possibility to register a callback that gets called *before* the config node is processed line by line (for example to include any headers on output) and *after* the config node is processed line by line (to include any footers on output). Also, it adds the config node reference itself as the callback arg in addition to have a possibility to extract more information from the config node itself if needed when processing the output callback (e.g. the key name, the id, or whether this is a section or a value etc...). If the config node from lvm.conf/--config tree is recognized and valid, it's always coupled with the config node definition ID from config_settings.h: struct dm_config_node { int id; const char *key; struct dm_config_node *parent, *sib, *child; struct dm_config_value *v; } For example if the dm_config_node *cn holds "devices/dev" configuration, then the cn->id holds "devices_dev_CFG" ID from config_settings.h, -1 if not found in config_settings.h and 0 if matching has not yet been done. To support the enhanced config node output, a new structure has been defined in libdevmapper to register it: struct dm_config_node_out_spec { dm_config_node_out_fn prefix_fn; /* called before processing config node lines */ dm_config_node_out_fn line_fn; /* called for each config node line */ dm_config_node_out_fn suffix_fn; /* called after processing config node lines */ }; Where dm_config_node_out_fn is: typedef int (*dm_config_node_out_fn)(const struct dm_config_node *cn, const char *line, void *baton); (so in comparison to existing callbacks for config node output, it has an extra dm_config_node *cn arg in addition) This patch also adds these functions to libdevmapper: - dm_config_write_node_out - dm_config_write_one_node_out ...which have exactly the same functionality as their counterparts without the "out" suffix. The "*_out" functions adds the extra hooks for enhanced config output (prefix_fn and suffix_fn mentioned above). One can still use the old interface for config node output, this is just an enhancement for those who'd like to modify the output more extensively.		2013-03-06 10:46:36 +01:00
..
config_settings.h	config: use config checks and add support for creating trees from config definition (config_def_create_tree fn)	2013-03-06 10:46:35 +01:00
config.c	config: add support for enhanced config node output	2013-03-06 10:46:36 +01:00
config.h	config: use config checks and add support for creating trees from config definition (config_def_create_tree fn)	2013-03-06 10:46:35 +01:00
defaults.h	config: refer to config nodes using assigned IDs	2013-03-06 10:14:33 +01:00