Please rewiev. Here added a function to process config. files options.

A lot of the default.c module code was refactored. The patch is needed
for the IM.


include/my_sys.h:
  Definitions added.
mysys/default.c:
  Added new api call: process_default_option_files. Also some coments
  changed to reflect current state of the code. It takes Basename for
  config file and the function to process options. The function is called
  everytime when we find an option. This way it is possible to get and
  process options from several groups in one file traversal.
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

BitKeeper/etc/logging_ok

@@ -31,6 +31,7 @@ bk@mysql.r18.ru
 brian@avenger.(none)
 brian@brian-akers-computer.local
 carsten@tsort.bitbybit.dk
+cps@silver_beast.(none)
 davida@isil.mysql.com
 dlenev@brandersnatch.localdomain
 dlenev@build.mysql.com

include/my_sys.h

@@ -506,6 +506,10 @@ my_off_t my_b_safe_tell(IO_CACHE* info); /* picks the correct tell() */
 
 typedef uint32 ha_checksum;
 
+/* Define the type of function to be passed to process_default_option_files */
+typedef int (*Process_option_func)(void *ctx, const char *group_name,
+                                    const char *option);
+
 #include <my_alloc.h>
 
 	/* Prototypes for mysys and my_func functions */
@@ -740,6 +744,9 @@ extern char *strmake_root(MEM_ROOT *root,const char *str,uint len);
 extern char *memdup_root(MEM_ROOT *root,const char *str,uint len);
 extern int load_defaults(const char *conf_file, const char **groups,
 			 int *argc, char ***argv);
+extern int process_default_option_files(const char *conf_file,
+                                        Process_option_func func,
+                                        void *func_ctx);
 extern void free_defaults(char **argv);
 extern void print_defaults(const char *conf_file, const char **groups);
 extern my_bool my_compress(byte *, ulong *, ulong *);