Apache Module Config Merge

An example apache module merge routine :

static void *mod_gzip_merge_dconfig(
apr_pool_t *p,
void *parent_conf,
void *newloc_conf
)
{
 mod_gzip_conf *merged_config = (mod_gzip_conf *) apr_pcalloc(p, sizeof(mod_gzip_conf));
 mod_gzip_conf *pconf         = (mod_gzip_conf *) parent_conf;
 mod_gzip_conf *nconf         = (mod_gzip_conf *) newloc_conf;

 mod_gzip_merge1(
 ( apr_pool_t    * ) p,
 ( mod_gzip_conf * ) merged_config,
 ( mod_gzip_conf * ) pconf,
 ( mod_gzip_conf * ) nconf
 );



static int mod_gzip_handler( request_rec *r ) {
 mod_gzip_conf *mgc; /* Location/Directory configuration */
 mgc = ( mod_gzip_conf * )
 ap_get_module_config( r->per_dir_config, &gzip_module );
}

register_hooks() {
  ap_hook_insert_filter( mod_gzip_insert_output_filter, NULL, NULL, APR_HOOK_MIDDLE );
 ap_register_output_filter( mod_gzip_filter_name, mod_gzip_output_filter, AP_FTYPE_CONTENT );
 return;
}