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21:28 -!- Irssi: #openbsd-daily: Total of 123 nicks [1 ops, 0 halfops, 0 voices, 122 normal]
21:29 < mulander> --- code read: /usr/bin/file more magic ---
21:29 < mulander> *** continue where we dropped of at read 3 ***
21:29 < mulander> code - http://bxr.su/OpenBSD/usr.bin/file/magic-test.c#1359
21:31 < mulander> man - https://man.openbsd.org/file
21:31 < mulander> man - https://man.openbsd.org/magic.5
21:32 < mulander> picking up wher we left
21:32 < mulander> next up is the undocumented MAGIC_TYPE_USE
21:32 < mulander> we know that from the libmagic manual which kl3 spotted
21:32 < mulander>               use         Recursively call the named magic starting from the current offset.  If the name of the referenced begins with a ^ then the endianness of the magic is switched; if the magic mentioned leshort
21:32 < mulander>                           for example, it is treated as beshort and vice versa.  This is useful to avoid duplicating the rules for different endianness.
21:34 < mulander> 'If the name of the referenced begins with a ^ then the endianness of the magic is switched'
21:34 < mulander> we can see a check for this on line 1364
21:36 < mulander> bot reslt in a call to magic_get_named
21:36 < mulander> http://bxr.su/OpenBSD/usr.bin/file/magic-test.c#magic_get_named
21:36 < mulander> this finds a node in the magic_named_tree
21:36 < mulander> that we saw is filled when the 'type name' is used
21:36 < mulander> so use is a call site
21:36 < mulander> whereas 'name' is the definition
21:37 < mulander> if the name is unfound we bail with a warning
21:38 < mulander> otherwise we call magic_test_children on the named node
21:38 < mulander> if not we call magic_test_children
21:38 < mulander> first call 1373 line
21:38 < mulander> second 1376
21:38 < mulander> the latter is always called
21:38 < mulander> as it tests our current node children
21:38 < mulander> http://bxr.su/OpenBSD/usr.bin/file/magic-test.c#magic_test_children
21:39 < mulander> in the call sites
21:39 < mulander>  magic_test_children(named, ms, offset, *ml->name == '^');
21:39 < mulander>  magic_test_children(ml, ms, ms->start, ms->reverse);
21:39 < mulander> the last parameter is int reverse
21:43 < mulander> we then iterate over all children of the requested node
21:43 < mulander> in the magic_test_children
21:43 < mulander> setting the state reverse, start and offset to the values we got
21:43 < mulander> and call magic_test_line
21:43 < mulander> that we read yesterday
21:43 < mulander> http://bxr.su/OpenBSD/usr.bin/file/magic-test.c#magic_test_line
21:44 < mulander> for each node in the tailq
21:44 < mulander> this lands us exactly on the spot we left off with
21:45 < mulander> kl3: I think we just found another undocumented type
21:45 < mulander> clear       This test is always true and clears the match flag for that continuation level.  It is intended to be used with the default test.
21:46 < mulander> but this duplicates the documented 'default'
21:46 < mulander> at least documentation wise
21:47 < mulander> but roughly if we got that far, and our type is not CLEAR
21:47 < mulander> we set ourselves as matched
21:47 < mulander> and return if ml->result was set
21:49 < mulander> I think this pretty much covers our read of file
21:51 < mulander> --- DONE ---